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BRITISH STANDARD
Specification for
Test sieves
UDC 621.928.2:620.168.32
BS 410:1986
Incorporating Amendment No. 1
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BS 410:1986
Committees responsible for this British Standard The preparation of this British Standard was entrusted by the General Mechanical Engineering Standards Committee (GME/-) to Technical Committee GME/29, upon which the following bodies were represented: BCIRA British Aggregate Construction Materials Industries British Ceramic Society British Laboratory Ware Association Cement and Concrete Association Cement Makers’ Federation Coated Abrasives Manufacturers Association Department of Trade and Industry (Warren Spring Laboratory) Department of Transport (Highways) Guild of Metal Perforators Incorporated National Association of British and Irish Millers Institution of Chemical Engineers Institution of Mining and Metallurgy Mechanical Handling Engineers Association Ministry of Defence National Coal Board Society of Chemical Industry Society of Cosmetic Scientists Woven Wire Association The following bodies were also represented in the drafting of the standard, through subcommittees and s:
This British Standard, having been prepared under the direction of the General Mechanical Engineering Standards Committee, was published under the authority of the Board of BSI and comes into effect on 31 March 1986
Institution of Mining Engineers Oil and Colour Chemists Association University of Bradford
© BSI 01-1999 First published April 1931 First revision October 1943 Second revision December 1962 Third revision September 1969 Fourth revision September 1976 Fifth revision March 1986 The following BSI references relate to the work on this standard: Committee reference GME/29 Draft for comment 84/79133 DC ISBN 0 580 14897 1
Amendments issued since publication Amd. No.
Date of issue
Comments
8255
July 1994
Indicated by a sideline in the margin
BS 410:1986
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Contents Committees responsible Foreword 1 2 3 4 5
Page Inside front cover ii
Scope Definitions Sieve designation, construction and marking Woven wire cloth in test sieves Perforated plates in test sieves
1 1 2 2 5
Appendix A Information to be supplied with an enquiry and order Appendix B Sieving areas and aperture tolerances expressed as percentages Appendix C Inspection of woven wire cloth Appendix D Inspection of perforated plate Appendix E Mesh number Appendix F Calibration tests Appendix G Maintenance of test sieves Appendix H Used sieves
10 12 13 14 15 16 16
Figure 1 — Weaves of wire cloth Figure 2 — Lid and receiver for round test sieves Figure 3 — Specimen label Figure 4 — Measurement of woven wire aperture size Figure 5 — Arrangement of square holes Figure 6 — Arrangement of round holes Figure 7 — Tolerance band gauge for optically magnified sieve cloth Figure 8 — Record card for inspection of woven wire cloth test sieve Figure 9 — Record card for inspection of perforated plate test sieve Figure 10 — Fields of measurement in 200 mm round test sieve
2 3 4 4 6 6 12 13 14 15
Table 1 — Dimensions of round test sieve frames Table 2 — Wire cloth in test sieves: wire diameter and tolerances on apertures Table 3 — Perforated plate in test sieves: plate thickness, pitch of holes, minimum bridge width and tolerance on individual apertures Table 4 — Sieving areas and aperture tolerances expressed as percentages Table 5 — Mesh number Table 6 — Number of apertures to be measured in a 200 mm diameter test sieve Publications referred to
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3 5 8 10 14 15
Inside back cover
i
BS 410:1986
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Foreword This British Standard, having been prepared under the direction of the General Mechanical Engineering Standards Committee, supersedes BS 410:1976 which is withdrawn. For wire cloth test sieves the R 40/3 series of aperture sizes, where successive sizes have a ratio of about 1.2, are specified. For perforated plate test sieves both the R 40/3 and the R 20 series are specified particularly to meet the requirements of the aggregate, coal and iron industries. A few special non-ISO1) aperture size perforated plate test sieves, some of such long standing that they have to be retained and others of larger size than is required by ISO/TC 24, are also included [see Table 3 c)]. Mesh numbers are included in Appendix E. A specification for electroformed test sieves is being developed by ISO/TC 24 and the “nominal size of openings” is specified in ISO 565-1983. A British Standard specification for electroformed sheet test sieves is in preparation. The methods of use of test sieves are described in BS 1796. In Figure 3 and Figure 7 the term “micron” is used as this is widely accepted in industry as representing micrometre (µm). This revised standard now includes an additional aperture size, 32 µm, and requirements for nesting round test sieves. A British Standard does not purport to include all the necessary provisions of a contract. s of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations.
Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 16, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. 1)
ii
International Organization for Standardization.
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BS 410:1986
1 Scope This British Standard specifies requirements for sieves used for testing the size distribution of granular products in the particle size range from 125 mm down to 32 µm. Appendix G gives information on the maintenance of test sieves. NOTE The titles of the publications referred to in this standard are listed on the inside back cover.
2 Definitions For the purposes of this British Standard the following definitions apply2). 2.1 test sieve a sieve, intended for the particle size analysis of the material to be sieved, which conforms to a test sieve standard specification 2.2 nest of test sieves a set (regular or irregular) of test sieves assembled together with a lid (cover) and receiver (pan)
2.9 wire diameter the diameter of the wire in the woven cloth 2.10 warp all wires running lengthwise of the cloth as woven 2.11 weft (shoot) all wires running crosswise of the cloth as woven 2.12 type of weave the way in which warp and weft wires cross each other 2.13 plain weave the weave in which every warp wire crosses alternately above and below every weft wire and vice versa [see Figure 1 a)] 2.14 twilled weave
2.3 sieving medium
The weave in which every warp wire crosses alternately above and below every second weft wire and vice versa [see Figure 1 b)]
a surface containing regularly arranged apertures of uniform shape and size
2.15 perforated plate
2.4 frame
a sieving medium consisting of a plate with uniform holes in symmetrical arrangement
a rigid framework which s the sieving medium and limits the spread of the material being sieved
2.16 pitch (centres)
2.5 lid (cover) a cover which fits snugly over a sieve to prevent escape of the material being sieved 2.6 receiver (pan) a pan which fits snugly beneath a sieve to receive the whole of the ing fraction 2.7 aperture size the dimension defining an opening 2.8 woven wire cloth
the distance between corresponding points of two adjacent holes in a perforated plate 2.17 bridge width (bar) the distance between the nearest edges of two adjacent holes in a perforated plate 2.18 margin the distance between the outside edges of the outside rows of holes and the edges of a perforated plate 2.19 plate thickness the thickness of the plate after perforation
a sieving medium of wires which cross each other to form the apertures
2)
Taken from ISO 2395.
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BS 410:1986
The seal between frame and sieving medium shall be formed so as to prevent lodging of the material to be sieved. There shall be no lacquer on surfaces that come into with the sample. 3.5 Nesting Sieves to the dimensions in Table 1, complete with lid and receiver, in a nest, shall so assemble that escape of sample during the test sieving operations is prevented. 3.6 Marking
Figure 1 — Weaves of wire cloth
3 Sieve designation, construction and marking 3.1 Designation Test sieves shall be designated by the nominal aperture size, which is the nominal central separation of opposite sides of a square aperture or the nominal diameter of a round (circular) aperture. The type of hole, square or round, in perforated plate shall be stated. 3.2 Sieve frames The dimensions of round sieve frames shall be as given in Table 1. NOTE 1 Frames should be made of brass, plated steel or stainless steel. NOTE 2 The appropriate sieving medium is included in Table 1. NOTE 3 For special purpose sieving, other shapes of frame are available.
3.3 Lid and receiver When required for round sieves, lids and receivers shall be of the same metal and gauge as the sieves (see Figure 2). 3.4 Finish Test sieves, receivers and lids shall be smoothly finished.
A label shall be permanently attached to the frame of each sieve complying with this standard, legibly marked with the following information (see Figure 3). a) The designation. The figures shall be bold, and preferably not less than 5 mm tall, on the left side of the label. b) The wording “TEST SIEVE TO BS 410:1986”3). c) The material of the wire cloth or of the perforated plate. d) The material of the sieve frame. e) The maker’s name or trade mark. f) An identification number. g) If required, the wire diameter. NOTE The purchaser should state in the enquiry and order (see Appendix A) if this marking is required.
4 Woven wire cloth in test sieves 4.1 Material Wires in test sieves shall not be plated. NOTE 1 The material for woven wire cloth is not specified. The following materials are commonly supplied. Material Range of aperture size for which suitable Phosphor bronze
Less than 250 µm
Brass
250 µm to 166 mm
Stainless steel All sizes NOTE 2 The purchaser should state in the enquiry and order (see Appendix A) specific requirements, if any, for the material of the wire cloth.
4.2 Wire After the cloth is mounted in the sieve, the average wire diameter at different positions across the sieving surface shall be uniform so that the limits on aperture size can be satisfied. A band of choice of ± 15 % about the wire diameters given in Table 2 is permitted.
3)
Marking BS 410:1986 on or in relation to a product is a claim by the manufacturer that the product has been manufactured in accordance with the requirements of the standard. The accuracy of such a claim is therefore solely the manufacturer’s responsibility. Enquiries as to the availability of third party certification should be addressed to the appropriate certification body.
2
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BS 410:1986
Table 1 — Dimensions of round test sieve frames
Nominal diameter, D and d
Tolerance
Diameter of sieving surface
D mm
100 200 300 450
a When
mm
d mm
+ 0.4
– 0.01
–0
– 0.4
+ 0.8
– 0.01
–0
– 0.4
+ 0.9
– 0.01
–0
– 0.6
+ 1.0
– 0.01
–0
– 1.0
min. mm
max.
Nominal depth, H Full
mm
mm
Appropriate sieving medium
Half mm
90
100
40
20
Wire cloth
185
200
50
25
Wire cloth or perforated plate
275
300
75
40
Wire clotha or perforated plate
425
450
Not less — than 100
Wire clotha or perforated plate
fine wire cloth is used in large diameter sieves, it should be ed by means of a mesh or spider.
Figure 2 — Lid and receiver for round test sieves
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BS 410:1986
Figure 3 — Specimen label 4.3 Weave Wire cloth shall be woven to produce nominally uniform square apertures in accordance with 4.5. Wire cloth in sieves with a nominal aperture size of 75 µm and greater shall be plain woven. Wire cloth in sieves with a nominal aperture of 63 µm and smaller shall be either twilled or plain woven. For aperture sizes of 4.00 mm and greater, the wire shall be crimped before weaving. 4.4 Mounting The wire cloth shall be so mounted in the frame as to be held firmly and equally taut in all directions without any distortion of the mesh. 4.5 Tolerances on aperture size 4.5.1 General. The measured aperture size before the sieve is used shall comply with the nominal size within tolerances X, Y, and Z given in Table 2. Aperture size is measured on the centre lines of the aperture (see Figure 4) and the tolerances shall apply to the warp and weft directions separately.
Figure 4 — Measurement of woven wire aperture size 4.5.2 Maximum tolerance for size of an individual aperture. No aperture size shall exceed the nominal value by more than the tolerance X. 4.5.3 Average aperture size. The average aperture size shall not differ from the nominal value by more than the tolerance Y. 4.5.4 Intermediate tolerance. Not more than 6 % of the apertures shall be above nominal size by more than the tolerance Z.
4
NOTE 1 Aperture tolerances, expressed as percentages, are given in Appendix B. NOTE 2 If the purchaser requires a tolerance on perpendicularity, this should be included in the order. No tolerance on perpendicularity of warp and weft wires is specified in this standard since s’ requirements may differ according to the material to be tested. A tolerance of ± 3° from perpendicularity may be acceptable in many cases and a visual inspection of general appearance of perpendicularity may be acceptable in other cases. It should be recognized that a test should apply to the general directions of the warp and weft wires over several apertures and not to a single aperture.
4.6 Inspection 4.6.1 General. The manufacturer shall test each test sieve before sale and supply a record card (see Appendix C). NOTE The purchaser should state in his order when a more detailed test, i.e. a calibration test in accordance with Appendix F, is required to be made by the manufacturer.
Tests shall be made with respect to each of three tolerances X, Y and Z as listed in Table 2. 4.6.2 Survey for condition. When tested in accordance with C.2, the sieve shall not show any obvious faults, e.g. weaving defects such as loose wire, creases and wrinkles. Part apertures are likely to be found round the periphery but if any blinded apertures away from the periphery are found the sieve shall be deemed not to comply with the requirements of this standard. 4.6.3 Oversize apertures. When tested in accordance with C.3, no aperture shall exceed the maximum dimension given in 4.5.2. 4.6.4 Variations of aperture size. When tested in accordance with C.4 and C.5, the proportion of apertures exceeding the intermediate limit shall be not greater than that given in 4.5.4. NOTE Tolerance + X ensures that no individual aperture exceeds a maximum limit; tolerance ± Y controls the average size of aperture; tolerance + Z ensures that the measured average size of aperture is not influenced too much by apertures of extreme size.
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BS 410:1986
Table 2 — Wire cloth in test sieves: wire diameter and tolerances on apertures Apertures in the range 16 mm to 20 µm Nominal Nominal Tolerances wire aperture diameter Maximum Tolerance Intermediate size tolerance for tolerance in test for size of average sieve an aperture individual aperture X Y Z mm mm mm mm mm
16.0 13.2 11.2
3.15 2.80 2.50
+ 0.99 + 0.86 + 0.77
± 0.49 ± 0.41 ± 0.35
+ 0.74 + 0.64 + 0.56
9.50 8.00 6.70
2.24 2.00 1.80
+ 0.68 + 0.60 + 0.53
± 0.30 ± 0.25 ± 0.21
+ 0.49 + 0.43 + 0.37
5.60 4.75 4.00
1.60 1.60 1.40
+ 0.47 + 0.42 + 0.37
± 0.18 ± 0.15 ± 0.13
+ 0.32 + 0.28 + 0.25
3.35 2.80 2.36
1.25 1.12 1.00
+ 0.32 + 0.29 + 0.25
± 0.11 ± 0.09 ± 0.08
+ 0.22 + 0.19 + 0.17
2.00 1.70 1.40
0.90 0.80 0.71
+ 0.23 + 0.20 + 0.18
± 0.07 ± 0.06 ± 0.05
+ 0.15 + 0.13 + 0.11
1.18 1.00
0.63 0.56
+ 0.16 + 0.14
± 0.04 ± 0.03
+ 0.10 + 0.09
µm
µm
µm
µm
µm
5 Perforated plates in test sieves 5.1 Arrangement of square holes Square holes shall be arranged in line with the centre points at the vertices of squares, as shown in Figure 5. 5.2 Arrangement of round holes Round holes shall be arranged with the centres at the apices of equilateral triangles, as shown in Figure 6. NOTE Plated mild steel is commonly supplied except at the lower end of the aperture range where brass may be found to be more suitable. The purchaser should state in the enquiry specific requirements, if any, for the material of the perforated plate.
5.3 Plate thickness Perforated plates shall be of uniform thickness and shall lie in the range given in Table 3. NOTE The nominal plate thicknesses stated in Table 3 are preferred.
5.4 Pitch The pitch shall be: a) the nominal pitch stated in Table 3; or b) up to 15 % larger than the nominal pitch stated in Table 3; or c) smaller than the nominal pitch stated in Table 3 provided that individual bridge widths comply with 5.5. 5.5 Bridge width
850 710 600
500 450 400
+ 127 + 112 + 101
± 29 ± 25 ± 21
+ 78 + 69 + 61
No individual bridge shall be less than half of the width given by subtracting the nominal aperture size from the nominal pitch.
500 425 355
315 280 224
+ 90 + 81 + 72
± 18 ± 15 ± 13
+ 54 + 48 + 43
NOTE
300 250 212
200 160 140
+ 65 + 58 + 52
± 12 ± 9.9 ± 8.7
+ 38 + 34 + 30
180 150 125
125 100 90
+ 47 + 43 + 38
± 7.6 ± 6.6 ± 5.8
+ 27 + 25 + 22
106 90 75
71 63 50
+ 35 + 32 + 29
± 5.2 ± 4.6 ± 4.1
+ 20 + 18 + 17
63 53 45
45 36 32
+ 26 + 24 + 22
± 3.7 ± 3.4 ± 3.1
+ 15 + 14 + 13
38 25 20
30 25 20
+ 20 + 16 + 14
± 2.9 ± 2.5 ± 2.3
+ 12 +9 +8
Minimum bridge widths are given in Table 3.
5.6 Workmanship Perforated plates shall be uniformly and cleanly punched. The radius at the corners of square holes shall not exceed 0.05W + 0.30 mm, where W is the aperture size expressed in millimetres. 5.7 Mounting The perforated plate shall be mounted with the punch entry side uppermost, i.e. burr down. The crevices above and below the plate at its junction with its frame shall be filled and left smooth. 5.8 Tolerances on aperture size Each aperture size of an unused sieve shall comply with the nominal size of the sieve within the limits of tolerance shown in Table 3. NOTE Aperture size is measured on the centre lines of square holes (see 5.1) and on the diameter of round holes (see 5.2).
NOTE The aperture sizes taken ISO 565. They are in an R40/3 series based on 1 mm with a ratio between successive sizes of about 1:2. The siazes in bold type are the principal sizes stated in ISO 565 and are preferred.
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BS 410:1986
5.9 Inspection 5.9.1 General. The manufacturer shall test each test sieve before sale and shall supply a record card (see Appendix D). NOTE The purchaser should state in his order when a more detailed test, i.e. a calibration test in accordance with Appendix F, is required.
5.9.2 Survey for condition. When tested in accordance with D.2, the perforated plate shall not show any obvious faults, e.g. irregularly formed holes, ragged edges and burrs upward. 5.9.3 Oversize apertures. When tested in accordance with D.3 and D.4 no aperture shall exceed the maximum dimension given in Table 3.
Figure 5 — Arrangement of square holes
Figure 6 — Arrangement of round holes
6
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BS 410:1986
Appendix A Information to be supplied with an enquiry and order The purchaser should state the following with an enquiry and order: a) the designation of the sieve (see 3.1); b) the sieving medium (i.e. woven wire cloth, square hole or round hole perforated plate); c) frame size and shape, and any other necessary details, e.g. nesting requirements (see 3.5) or wire diameter (see 4.2); d) any material requirements or restrictions for frame, sieving medium and fillets; whether statement of wire diameter is required (see 4.1 and 4.5); e) whether a receiver is required (see 3.3); f) whether a lid is required (see 3.3); g) whether a more detailed test is required (see 4.6.1 and 5.9.1).
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BS 410:1986
Table 3 — Perforated plate in test sieves: plate thickness, pitch of holes, minimum bridge width and tolerance on individual apertures a) Apertures in the range 125 mm to 4 mm; square hole and round hole Nominal aperture size R40/3 series mm
125
R/20 series mm
125 112
106 90.0
100 90.0 80.0
75.0 63.0
71.0 63.0 56.0
53.0 45.0
50.0 45.0 40.0
37.5 31.5
35.5 31.5 28.0
26.5 22.4
25.0 22.4 20.0
19.0 16.0
18.0 16.0 14.0
13.2 11.2
12.5 11.2 10.0
9.50 8.00
9.00 8.00 7.10
6.70 5.60
6.30 5.60 5.00
4.75 4.00
8
4.50 4.00
Plate thickness Nominala Max. mm
2.5 2.0 1.5 1.5
mm
Nominal pitch of holes
Minimum bridge width
Min. mm
mm
mm
mm
160
17.5
± 1.00
140 132
14.0 13.0 12.5
112 2.0
100 10.0
± 0.70
67
7.0
± 0.55 ± 0.55
5.5 50.0
47.5
± 0.50 5.0
5.0
± 0.45 ± 0.45
45.0
4.75
40.0
±0.40
4.25 35.5
33.5
± 0.40 3.75
3.5
± 0.35 ± 0.35
31.5
3.25
28.0
± 0.35
2.8 25.0
23.6
± 0.30 2.5
2.3
± 0.30 ± 0.29
22.4
2.2
20.0
± 0.28
2.0 18
17
± 0.27 2.0
1.9
± 0.26 ± 0.25
16
1.75
14
±0.24
1.4 12.6
12.1
± 0.23 1.3
1.3
± 0.21 ± 0.21
11.6
1.3
10.4
± 0.20
1.2 9.4
8.9
± 0.19 1.15
1.1
± 0.18 ± 0.17
8.5
1.1
7.7
± 0.17
1.05 6.9
6.6
± 0.15 0.95
0.93
± 0.14 ± 0.14
6.3 5.8
± 0.55
6.5
56.0
1.0
± 0.60 7.5
63
2.0
± 0.65
8.5 71
1.0
± 0.70
9.5
80
2.0
± 0.80 10.0
90
1.5
± 0.85
11.0
95
2.5
± 0.95 ± 0.90
125 3.0
Tolerance on individual apertures
0.9 0.9
± 0.14 ± 0.13
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BS 410:1986
Table 3 — Perforated plate in test sieves: plate thickness, pitch of holes, minimum bridge width and tolerance on individual apertures b) Round holes only in the range 3.55 mm to 1 mm Nominal aperture size R40/3 series mm
3.55 2.80 2.36 2.00 1.70 1.40 1.18 1.00
Plate thickness
R/20 series
Nominala
Max.
Min.
mm
mm
mm
mm
3.55 3.15 2.80 2.50 2.24 2.00 1.80 1.60 1.40 1.25 1.12 1.00
1.00
Nominal pitch of holes
Minimum bridge width
Tolerance on individual apertures
mm
mm
mm
5.2
5.0 1.25
0.8
4.35 3.75 3.3
0.5
3.0 0.63
0.4
4.7 3.9 3.6 3.1 2.75
2.6 2.4 2.0
2.45 2.22
0.83
0.83 0.78 0.7 0.65 0.65
0.78 0.7 0.67 0.65 0.58
0.6 0.6 0.5
0.6 0.55
± 0.12
± 0.11 ± 0.11 ± 0.11 ± 0.09 ± 0.08
± 0.11 ± 0.11 ± 0.10 ± 0.08 ± 0.08
± 0.08 ± 0.07 ± 0.07
± 0.08 ± 0.07
c) Non-ISO sizes; round holes only Nominal aperture size
Nominal
mm
mm
200b 180b 160b 140b 120 70 60 35 30 15 7.5
Plate thickness a
Max.
Min.
Nominal pitch of holes
Minimum bridge width
mm
mm
mm
mm
2.5
3.0
2.0
2.0
2.5
1.5
1.5
2.0
1.0
Tolerance on individual apertures mm
150 90 75 45 37.5 19
15 10 7.5 5 3.75 2.0
± 1.55 ± 1.40 ± 1.25 ± 1.10 ± 0.95 ± 0.65 ± 0.60 ± 0.40 ± 0.40 ± 0.27
10
1.25
± 0.19
NOTE 1 Bold type signifies preferred sizes. NOTE 2 The sizes listed under “Nominal aperture size” are the total specified by ISO 565 for perforated plate in test sieves. However, manufacturers of perforated plate test sieves may equip themselves for making only those sizes for which there is a demand sufficient to justify the expense of their tools. When particle sizes are being considered for products, enquiries should be made as to the stock position of test sieves, having the aperture size in mind. NOTE 3 The sizes listed under “Nominal aperture size” in the R40/3 series are based on 1 mm with a ratio between successive sizes of about 1:2 those in the R20 series have a ratio of about 1:12. The sizes in bold type are the principal sizes stated in ISO 565 and are preferred. a b
See note to 5.3 Test sieves of these aperture sizes may be made as single ring gauges. A minimum plate thickness of 3 mm is recommended.
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BS 410:1986
Appendix B Sieving areas and aperture tolerances expressed as percentages B.1 Sieving areas and aperture tolerances expressed as percentages are given in Table 4. Table 4 — Sieving areas and aperture tolerances expressed as percentages Nominal aperture size
Wire cloth
mm
%
125 112 106 100
Sieving areas Perforated plate Square hole Round hole %
%
Aperture tolerances expressed as percentages Wire cloth Perforated plate Maximum Average Intermediate X Y Z % % % % ± 0.8 ± 0.85 ± 0.85 ± 0.85
61 64 64 64
55 58 58 58
90.0 80.0 75.0
65 64 62
59 58 57
± 0.9 ± 0.9 ± 0.9
71.0
56
51
± 0.9
63.0 56.0 53.0 50.0
62 63 63 64
56 57 57 58
± 0.95 ±1 ±1 ±1
45.0 40.0 37.5 35.0
65 64 61 56
59 58 55 51
±1 ±1 ±1 ±1
31.5 38.0 26.5 25.0
62 62 63 63
56 56 57 57
± 1.5 ± 1.5 ± 1.5 ± 1.5
22.4 20.0 19.0 18.0
64 64 65 65
58 58 59 59
± 1.5 ± 1.5 ± 1.5 ± 1.5
64 60 60 61
58 54 55 55
+7
±3
+5
+7
±3
+5
64 61 61 60
58 55 55 54
+7
±3
+5
+7
±3
+5
57 57 52 55
52 52 47 50
+8
±3
+6
+ 8.5
±3
+6
49 52 47 51
44 47 43 46
+9
±3
+6
+9
±3
+6
44
40 42 38 40
+ 10
±3
+7
+ 10
±3
+7
16.0 14.0 13.2 12.5
70
11.2 10.0 9.5 9.00
67
8.00 7.10 6.70 6.30
64
5.60 5.00 4.75 4.50
60
4.00 3.55 3.35 3.15
55
10
68
65
62
56
53
± 1.5 ±2 ±2 ±2 ±2 ±2 ±2 ±2 ± 2.5 ± 2.5 ± 2.5 ± 2.5 ± 2.5 ± 2.5 ±3 ±3 ±3 ± 3.5 ± 3.5 ± 3.5
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BS 410:1986
Table 4 — Sieving areas and aperture tolerances expressed as percentages Nominal aperture size
mm 2.80 2.50 2.36 2.24
Wire cloth
%
Sieving areas Perforated plate Square hole Round hole %
51 49
2.00 1.80 1.70 1.60
48
1.40 1.25 1.18 1.12 1.00
44
% 35 37 34 35
46
43 41
Aperture tolerances expressed as percentages Wire cloth Perforated plate Maximum Average Intermediate X Y Z % % % % + 11 ±3 +7 ±4 ± 4.5 + 11 ±3 +7 ±4 ± 4.5
32 30 31 30
+ 12
±3
+8
+ 12
±3
+8
28 23 27 23 25
+ 13
±3
+8
+ 14
±3
+9
+ 15
±3
+9
± 4.5 ± 4.5 ± 5.5 ±5 ± 5.5 ± 6.5 ±7 ±6 ±7
120a
58
± 0.8
70a
55
± 0.9
60a
58
±1
35a
55
±1
30a
58
± 1.5
15a
57
±2
7.5a µm 850 710 600
40 37 36
500 425 355
51
± 2.5 +1 5 + 16 + 17
% ± 3.5 ±4 ±4
+9 + 10 + 11
38 36 38
+ 18 + 19 + 20
±4 ±4 ±4
+ 11 + 12 + 12
300 250 212
36 37 36
+ 21 + 22 + 24
±4 ±4 ± 4.5
+ 13 + 13 + 14
180 150 125
35 36 34
+ 24 + 26 + 29
±5 ±5 ±5
+ 15 + 16 + 17
106 90 75
36 35 36
+ 31 + 33 + 36
±5 ±5 ±5
+ 18 + 19 + 21
63 53 45
34 35 34
+ 39 + 43 + 43
±5 ±5 ±6
+ 22 + 24 + 27
38 32
31 28
+ 53 + 59
±6 ±8
+ 29 + 34
a
%
%
%
Non-ISO sizes; round hole perforated plate only.
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BS 410:1986
B.2 The formulae for calculating percentage sieving areas are as follows: a) woven wire cloth 2
W ----------------------- × 100 2 (W + d) b) square hole perforated plate 2
W -------- × 100 2 p c) round hole perforated plate 2
π (W ⁄ 2) -------------------------- × 100 0.866p
2
or 2
W -------- × 90.7 2 p where W is the nominal aperture size; d is the wire diameter (see Table 2); p is the pitch (see Table 3).
C.4 Variations of aperture size Check the proportion of apertures that exceed the intermediate limit, i.e. nominal aperture size + Z. Take measurements across the two diameters of the sieve frame, parallel to the warp and weft directions and/or in areas of irregular apertures as found from C.3. NOTE The measurements may be carried out rapidly using a limit gauge in the form of a scale (see Figure 7) or by individual gauges for coarser mesh sieves. At least 100 apertures should be observed, if possible, in each direction.
Record the number of apertures whose size in either the warp or weft direction falls within the tolerance band of (nominal + Z) and (nominal + Y) and express as a proportion of the total apertures checked. NOTE This method should be used to confirm that no apertures exceed the maximum of (nominal + X ); it may also be used to make an assessment of the distribution of the aperture width in the various tolerance bands, namely: less than (nominal – Y ) between (nominal – Y ) and (nominal + Y ) between (nominal + Y ) and (nominal + Z ) between (nominal + Z ) and (nominal + X )
NOTE The maximum aperture size specified in this standard for wire cloth is 16 mm; the minimum aperture size specified for square hole perforated plate is 4 mm, and the minimum aperture size specified for round hole perforated plate is 1 mm.
Appendix C Inspection of woven wire cloth C.1 Principle First a survey is made of the condition of the wire cloth, followed by a methodical examination of individual apertures and finally measurements are made of the average aperture size. The procedure for measurement of aperture size varies according to the size and number of apertures in the sieve (see C.4). C.2 Survey for condition Examine the wire cloth in the sieve for condition. NOTE For this survey a uniformly illuminated background is helpful.
C.3 Oversize apertures Examine all openings carefully and methodically in order to detect oversize apertures. Assess suspected oversize apertures in coarse sieves with an engineer’s limit gauge, segmental or calliper. NOTE 1 Apertures in fine sieves may best be viewed when magnified optically. In the case of fine sieves, lack of uniformity in aperture size can be seen in contrast with the general pattern of apertures of uniform size. NOTE 2 Typical indications are a line of large apertures, or local, noticeably irregular apertures. Record the location of such areas in question.
12
Figure 7 — Tolerance band gauge for optically magnified sieve cloth C.5 Average size of aperture Measure the average aperture size over at least 10 apertures, if possible, in each direction in each of at least two positions on the cloth. If the results from the two fields fall in different tolerance bands and if they contradict the information obtained from C.4, check the average aperture size at more positions on the sieving surface. C.6 Record card A suitable form of record card with specimen entries for a woven wire test sieve is given in Figure 8.
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BS 410:1986
Times used
Tester Date
New
ABC/86/10
Visual survey and maximum aperture
Average aperture size
Apertures above intermediate limits
Warp direction Weft direction Warp direction
Within ± Y
Within ± Y
Weft direction
Less than 6 % Less than 6 %
NOTE It is the ’s responsibility to ensure that a used sieve is re-examined. He, or a referee, should make retests according to the circumstances, and with a frequency appropriate to the degree of use that the sieve has undergone. For further information, see Appendix H of BS 410:1986.
Figure 8 — Record card for inspection of woven wire cloth test sieve
Appendix D Inspection of perforated plate D.1 Principle First a survey is made of the condition of the perforated plate, followed by a methodical examination of individual apertures and finally measurements are taken of individual aperture size. The procedure for measurement of aperture size varies according to the size and to the number of apertures in the sieve (see D.4). D.2 Survey for condition Examine the perforated plate in the sieve for condition. D.3 Oversize apertures Examine all openings carefully and methodically in order to detect oversize apertures. Assess suspected oversize apertures in coarse sieves with an engineer’s calliper or limit gauge, segmental or calliper.
Inspect every aperture; check square holes at mid-section in both directions across and check round holes across various diameters. Use either of the following procedures for the inspection. a) In any selected area check the holes along each of two straight lines of at least 100 mm length and including at least 10 holes, five along each direction. NOTE The lines should be at 90° or 60° for round holes, or at 90° for square holes.
b) For square holes, check holes along a line parallel to a diagonal of the holes for at least 150 mm and at least eight holes. If the plate has only 20 holes or less, check every hole. D.5 Record card A suitable form of record card with specimen entries for a perforated plate test sieve is given in Figure 9.
NOTE Apertures in finer sieves may be viewed when magnified optically.
Irregularity of bridge width is an indication of suspect apertures. D.4 Measurement of individual apertures Check individual apertures for compliance with the tolerances given in Table 3. NOTE Callipers, tapered plate gauges, segmental plain limit plug gauges, or optical projection may be used.
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BS 410:1986
Times used
New
Tester
ABC
Date
Visual survey
Compliance with the tolerances of BS 410
86/11
NOTE It is the ’s responsibility to ensure that a used test sieve is re-examined. He, or a referee, should make retests according to the circumstances, and with a frequency appropriate to the degree of use that the sieve has undergone. For further information see Appendix H of BS 410:1986.
Figure 9 — Record card for inspection of perforated plate test sieve
Appendix E Mesh number Wire cloth was traditionally designated by the weaver by the number of meshes per inch, called its mesh count or mesh number. This method was widely used and was, until 1962, the basic designation in BS 410. The usage in industry persists, particularly for the ready recognition of wire cloth by mesh count. However, sieves in accordance with BS 410 are now designated by aperture size, which is the relationship to particle size in a test sieve analysis. Table 5 is supplied only for information to relate mesh number readily to aperture size. The number of meshes per inch depends on the wire diameter for a given aperture size in wire cloth and a nominal mesh number should be taken as an approximation.
14
Table 5 — Mesh number (a) Nominal aperture size 5.60 mm to 1.00 mm Mesh number
Nominal aperture size
(b) Nominal aperture size 850 µm to 32 µm Mesh number
Nominal aperture size
mm
µm
3 3½ 4
5.60 4.75 4.00
18 22 25
850 710 600
5 6 7
3.35 2.80 2.36
30 36 44
500 425 355
8 10 12
2.00 1.70 1.40
52 60 72
300 250 212
14 16
1.18 1.00
85 100 120
180 150 125
150 170 200
106 90 75
240 300 350
63 53 45
400 440
38 32
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BS 410:1986
Appendix F Calibration tests F.1 General When more detailed information is required about the woven wire cloth or perforated plate in a test sieve, the acceptance test (see 4.6 and 5.9) should be supplemented as described in F.2. F.2 Woven wire cloth test sieves The measurement of the average aperture width should be made in a number of fields evenly spread over the whole area of the sieve, and so chosen that no two fields are crossed by the same wire (see Figure 10). The number of fields and the minimum number of apertures that should be measured in each field of a 200 mm diameter sieve frame, in both the warp and the weft direction separately, are given in Table 6.
Table 6 — Number of apertures to be measured in a 200 mm diameter test sieve Nominal aperture width
Number of Minimum number of consecutive apertures to be measured in fields each direction In each field
In all fields
mm
3.35 2.80 2.36
10 10 10
3 3 4
30 30 40
2.00 1.70 1.40
10 10 10
4 5 6
40 50 60
1.18 1.00
10 10
8 9
80 90
850
10
10
100
710 600 500
10 10 10
12 15 15
120 150 150
425 355 300
10 10 10
20 25 30
200 250 300
250 212 180
10
30
300
15
20
300
µm
150 125 106 90 75 63 Figure 10 — Fields of measurement in a 200 mm round test sieve
53 45 38 32
In the cases of 100 mm and 300 mm diameter sieve frames, the number of fields for measurement should be 4 and 15 respectively.
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BS 410:1986
For aperture sizes larger than 3.35 mm, it is usual to check the size with engineers’ gauges, and 20 and 30 apertures may be assessed rapidly by this means. If a sieve has 20 apertures or less, then all apertures should be measured. If, when making this test, the measured average aperture width is found to be so uniform in the first few fields that the full recommended number of fields is not measured, then the result of the fields tested should be shown on the record card. F.3 Perforated plate test sieves When more detailed information is required about the apertures in the perforated plate in a test sieve, either more apertures should be checked by limit gauging or the dimensions of apertures should be measured directly. F.4 Checking with a reference sample Sieves can be checked by sieving known material and comparing the amount of residue on the sieve with that expected. Known material can be either: a) reference material with agreed particle size distribution; or b) a material that has also been sieved on a set of master test sieves reserved for this checking operation. NOTE For information on the availability of powders with certified particle size distribution, apply to one of the following bodies. 1) Community Bureau of Reference BCR Rue de la Loi 200 B1049 Brussels 2) National Bureau of Standards Washington DC 20234 USA 3) Office of Reference Materials Laboratory of the Government Chemist Queens Road
Appendix G Maintenance of test sieves G.1 Before each use the sieving medium and frame should be inspected and if necessary cleaned. The cleaning of the sieve should be carried out with great care so that the sieving medium is not damaged. The sieving medium should not be fingered.
16
G.2 Occasionally sieves may be washed in warm deionized water containing a liquid synthetic detergent. After washing, the sieves should be rinsed thoroughly in deionized water and dried at a temperature not exceeding 80 °C. It is important to note that test sieves should not be heated to high temperature. The sieves may be cleaned by immersing in a suitable liquid, e.g. alcohol or deionized water in an ultrasonic bath and treated for 15 s to 20 s with a frequency not less than 30 kHz and power input not exceeding 60 W/L. G.3 Wire mesh test sieves, particularly those with a nominal aperture size smaller than 3.35 mm, should not be brushed or exposed to compressed air.
Appendix H Used sieves H.1 ’s tests on used sieves The sizes and tolerances in this standard apply to new sieves. With continued use, test sieves will wear; it is therefore necessary for the apertures to be remeasured from time to time. If the is not prepared to make such periodic reinspections, recourse may be made to specialists in testing. H.2 Wear allowances on test sieves The tolerances on sieve apertures are determined by the degree of closeness to nominal values attainable in current manufacturing practice. Increases in aperture size (due to wear) which may be acceptable in service are determined by the requirements of the product, and may well be included in the product specification. They are not necessarily the same as the manufacturing tolerance. H.3 Applicability of marking The designation “TEST SIEVE TO BS 410” is not applicable when the apertures of a test sieve no longer comply with the appropriate tolerances according to the marking on the label on the sieve frame (see 3.6).
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BS 410:1986
Publications referred to BS 1796, Method for test sieving. ISO 565, Test sieves — Woven metal wire cloth, perforated plate and electroformed sheet — Nominal sizes of openings. ISO 2395, Test sieves and test sieving — Vocabulary.
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BRITISH STANDARD
Specification for
Test sieves
UDC 621.928.2:620.168.32
BS 410:1986
Incorporating Amendment No. 1
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BS 410:1986
Committees responsible for this British Standard The preparation of this British Standard was entrusted by the General Mechanical Engineering Standards Committee (GME/-) to Technical Committee GME/29, upon which the following bodies were represented: BCIRA British Aggregate Construction Materials Industries British Ceramic Society British Laboratory Ware Association Cement and Concrete Association Cement Makers’ Federation Coated Abrasives Manufacturers Association Department of Trade and Industry (Warren Spring Laboratory) Department of Transport (Highways) Guild of Metal Perforators Incorporated National Association of British and Irish Millers Institution of Chemical Engineers Institution of Mining and Metallurgy Mechanical Handling Engineers Association Ministry of Defence National Coal Board Society of Chemical Industry Society of Cosmetic Scientists Woven Wire Association The following bodies were also represented in the drafting of the standard, through subcommittees and s:
This British Standard, having been prepared under the direction of the General Mechanical Engineering Standards Committee, was published under the authority of the Board of BSI and comes into effect on 31 March 1986
Institution of Mining Engineers Oil and Colour Chemists Association University of Bradford
© BSI 01-1999 First published April 1931 First revision October 1943 Second revision December 1962 Third revision September 1969 Fourth revision September 1976 Fifth revision March 1986 The following BSI references relate to the work on this standard: Committee reference GME/29 Draft for comment 84/79133 DC ISBN 0 580 14897 1
Amendments issued since publication Amd. No.
Date of issue
Comments
8255
July 1994
Indicated by a sideline in the margin
BS 410:1986
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Contents Committees responsible Foreword 1 2 3 4 5
Page Inside front cover ii
Scope Definitions Sieve designation, construction and marking Woven wire cloth in test sieves Perforated plates in test sieves
1 1 2 2 5
Appendix A Information to be supplied with an enquiry and order Appendix B Sieving areas and aperture tolerances expressed as percentages Appendix C Inspection of woven wire cloth Appendix D Inspection of perforated plate Appendix E Mesh number Appendix F Calibration tests Appendix G Maintenance of test sieves Appendix H Used sieves
10 12 13 14 15 16 16
Figure 1 — Weaves of wire cloth Figure 2 — Lid and receiver for round test sieves Figure 3 — Specimen label Figure 4 — Measurement of woven wire aperture size Figure 5 — Arrangement of square holes Figure 6 — Arrangement of round holes Figure 7 — Tolerance band gauge for optically magnified sieve cloth Figure 8 — Record card for inspection of woven wire cloth test sieve Figure 9 — Record card for inspection of perforated plate test sieve Figure 10 — Fields of measurement in 200 mm round test sieve
2 3 4 4 6 6 12 13 14 15
Table 1 — Dimensions of round test sieve frames Table 2 — Wire cloth in test sieves: wire diameter and tolerances on apertures Table 3 — Perforated plate in test sieves: plate thickness, pitch of holes, minimum bridge width and tolerance on individual apertures Table 4 — Sieving areas and aperture tolerances expressed as percentages Table 5 — Mesh number Table 6 — Number of apertures to be measured in a 200 mm diameter test sieve Publications referred to
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3 5 8 10 14 15
Inside back cover
i
BS 410:1986
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Foreword This British Standard, having been prepared under the direction of the General Mechanical Engineering Standards Committee, supersedes BS 410:1976 which is withdrawn. For wire cloth test sieves the R 40/3 series of aperture sizes, where successive sizes have a ratio of about 1.2, are specified. For perforated plate test sieves both the R 40/3 and the R 20 series are specified particularly to meet the requirements of the aggregate, coal and iron industries. A few special non-ISO1) aperture size perforated plate test sieves, some of such long standing that they have to be retained and others of larger size than is required by ISO/TC 24, are also included [see Table 3 c)]. Mesh numbers are included in Appendix E. A specification for electroformed test sieves is being developed by ISO/TC 24 and the “nominal size of openings” is specified in ISO 565-1983. A British Standard specification for electroformed sheet test sieves is in preparation. The methods of use of test sieves are described in BS 1796. In Figure 3 and Figure 7 the term “micron” is used as this is widely accepted in industry as representing micrometre (µm). This revised standard now includes an additional aperture size, 32 µm, and requirements for nesting round test sieves. A British Standard does not purport to include all the necessary provisions of a contract. s of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations.
Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 16, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. 1)
ii
International Organization for Standardization.
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BS 410:1986
1 Scope This British Standard specifies requirements for sieves used for testing the size distribution of granular products in the particle size range from 125 mm down to 32 µm. Appendix G gives information on the maintenance of test sieves. NOTE The titles of the publications referred to in this standard are listed on the inside back cover.
2 Definitions For the purposes of this British Standard the following definitions apply2). 2.1 test sieve a sieve, intended for the particle size analysis of the material to be sieved, which conforms to a test sieve standard specification 2.2 nest of test sieves a set (regular or irregular) of test sieves assembled together with a lid (cover) and receiver (pan)
2.9 wire diameter the diameter of the wire in the woven cloth 2.10 warp all wires running lengthwise of the cloth as woven 2.11 weft (shoot) all wires running crosswise of the cloth as woven 2.12 type of weave the way in which warp and weft wires cross each other 2.13 plain weave the weave in which every warp wire crosses alternately above and below every weft wire and vice versa [see Figure 1 a)] 2.14 twilled weave
2.3 sieving medium
The weave in which every warp wire crosses alternately above and below every second weft wire and vice versa [see Figure 1 b)]
a surface containing regularly arranged apertures of uniform shape and size
2.15 perforated plate
2.4 frame
a sieving medium consisting of a plate with uniform holes in symmetrical arrangement
a rigid framework which s the sieving medium and limits the spread of the material being sieved
2.16 pitch (centres)
2.5 lid (cover) a cover which fits snugly over a sieve to prevent escape of the material being sieved 2.6 receiver (pan) a pan which fits snugly beneath a sieve to receive the whole of the ing fraction 2.7 aperture size the dimension defining an opening 2.8 woven wire cloth
the distance between corresponding points of two adjacent holes in a perforated plate 2.17 bridge width (bar) the distance between the nearest edges of two adjacent holes in a perforated plate 2.18 margin the distance between the outside edges of the outside rows of holes and the edges of a perforated plate 2.19 plate thickness the thickness of the plate after perforation
a sieving medium of wires which cross each other to form the apertures
2)
Taken from ISO 2395.
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BS 410:1986
The seal between frame and sieving medium shall be formed so as to prevent lodging of the material to be sieved. There shall be no lacquer on surfaces that come into with the sample. 3.5 Nesting Sieves to the dimensions in Table 1, complete with lid and receiver, in a nest, shall so assemble that escape of sample during the test sieving operations is prevented. 3.6 Marking
Figure 1 — Weaves of wire cloth
3 Sieve designation, construction and marking 3.1 Designation Test sieves shall be designated by the nominal aperture size, which is the nominal central separation of opposite sides of a square aperture or the nominal diameter of a round (circular) aperture. The type of hole, square or round, in perforated plate shall be stated. 3.2 Sieve frames The dimensions of round sieve frames shall be as given in Table 1. NOTE 1 Frames should be made of brass, plated steel or stainless steel. NOTE 2 The appropriate sieving medium is included in Table 1. NOTE 3 For special purpose sieving, other shapes of frame are available.
3.3 Lid and receiver When required for round sieves, lids and receivers shall be of the same metal and gauge as the sieves (see Figure 2). 3.4 Finish Test sieves, receivers and lids shall be smoothly finished.
A label shall be permanently attached to the frame of each sieve complying with this standard, legibly marked with the following information (see Figure 3). a) The designation. The figures shall be bold, and preferably not less than 5 mm tall, on the left side of the label. b) The wording “TEST SIEVE TO BS 410:1986”3). c) The material of the wire cloth or of the perforated plate. d) The material of the sieve frame. e) The maker’s name or trade mark. f) An identification number. g) If required, the wire diameter. NOTE The purchaser should state in the enquiry and order (see Appendix A) if this marking is required.
4 Woven wire cloth in test sieves 4.1 Material Wires in test sieves shall not be plated. NOTE 1 The material for woven wire cloth is not specified. The following materials are commonly supplied. Material Range of aperture size for which suitable Phosphor bronze
Less than 250 µm
Brass
250 µm to 166 mm
Stainless steel All sizes NOTE 2 The purchaser should state in the enquiry and order (see Appendix A) specific requirements, if any, for the material of the wire cloth.
4.2 Wire After the cloth is mounted in the sieve, the average wire diameter at different positions across the sieving surface shall be uniform so that the limits on aperture size can be satisfied. A band of choice of ± 15 % about the wire diameters given in Table 2 is permitted.
3)
Marking BS 410:1986 on or in relation to a product is a claim by the manufacturer that the product has been manufactured in accordance with the requirements of the standard. The accuracy of such a claim is therefore solely the manufacturer’s responsibility. Enquiries as to the availability of third party certification should be addressed to the appropriate certification body.
2
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BS 410:1986
Table 1 — Dimensions of round test sieve frames
Nominal diameter, D and d
Tolerance
Diameter of sieving surface
D mm
100 200 300 450
a When
mm
d mm
+ 0.4
– 0.01
–0
– 0.4
+ 0.8
– 0.01
–0
– 0.4
+ 0.9
– 0.01
–0
– 0.6
+ 1.0
– 0.01
–0
– 1.0
min. mm
max.
Nominal depth, H Full
mm
mm
Appropriate sieving medium
Half mm
90
100
40
20
Wire cloth
185
200
50
25
Wire cloth or perforated plate
275
300
75
40
Wire clotha or perforated plate
425
450
Not less — than 100
Wire clotha or perforated plate
fine wire cloth is used in large diameter sieves, it should be ed by means of a mesh or spider.
Figure 2 — Lid and receiver for round test sieves
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BS 410:1986
Figure 3 — Specimen label 4.3 Weave Wire cloth shall be woven to produce nominally uniform square apertures in accordance with 4.5. Wire cloth in sieves with a nominal aperture size of 75 µm and greater shall be plain woven. Wire cloth in sieves with a nominal aperture of 63 µm and smaller shall be either twilled or plain woven. For aperture sizes of 4.00 mm and greater, the wire shall be crimped before weaving. 4.4 Mounting The wire cloth shall be so mounted in the frame as to be held firmly and equally taut in all directions without any distortion of the mesh. 4.5 Tolerances on aperture size 4.5.1 General. The measured aperture size before the sieve is used shall comply with the nominal size within tolerances X, Y, and Z given in Table 2. Aperture size is measured on the centre lines of the aperture (see Figure 4) and the tolerances shall apply to the warp and weft directions separately.
Figure 4 — Measurement of woven wire aperture size 4.5.2 Maximum tolerance for size of an individual aperture. No aperture size shall exceed the nominal value by more than the tolerance X. 4.5.3 Average aperture size. The average aperture size shall not differ from the nominal value by more than the tolerance Y. 4.5.4 Intermediate tolerance. Not more than 6 % of the apertures shall be above nominal size by more than the tolerance Z.
4
NOTE 1 Aperture tolerances, expressed as percentages, are given in Appendix B. NOTE 2 If the purchaser requires a tolerance on perpendicularity, this should be included in the order. No tolerance on perpendicularity of warp and weft wires is specified in this standard since s’ requirements may differ according to the material to be tested. A tolerance of ± 3° from perpendicularity may be acceptable in many cases and a visual inspection of general appearance of perpendicularity may be acceptable in other cases. It should be recognized that a test should apply to the general directions of the warp and weft wires over several apertures and not to a single aperture.
4.6 Inspection 4.6.1 General. The manufacturer shall test each test sieve before sale and supply a record card (see Appendix C). NOTE The purchaser should state in his order when a more detailed test, i.e. a calibration test in accordance with Appendix F, is required to be made by the manufacturer.
Tests shall be made with respect to each of three tolerances X, Y and Z as listed in Table 2. 4.6.2 Survey for condition. When tested in accordance with C.2, the sieve shall not show any obvious faults, e.g. weaving defects such as loose wire, creases and wrinkles. Part apertures are likely to be found round the periphery but if any blinded apertures away from the periphery are found the sieve shall be deemed not to comply with the requirements of this standard. 4.6.3 Oversize apertures. When tested in accordance with C.3, no aperture shall exceed the maximum dimension given in 4.5.2. 4.6.4 Variations of aperture size. When tested in accordance with C.4 and C.5, the proportion of apertures exceeding the intermediate limit shall be not greater than that given in 4.5.4. NOTE Tolerance + X ensures that no individual aperture exceeds a maximum limit; tolerance ± Y controls the average size of aperture; tolerance + Z ensures that the measured average size of aperture is not influenced too much by apertures of extreme size.
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BS 410:1986
Table 2 — Wire cloth in test sieves: wire diameter and tolerances on apertures Apertures in the range 16 mm to 20 µm Nominal Nominal Tolerances wire aperture diameter Maximum Tolerance Intermediate size tolerance for tolerance in test for size of average sieve an aperture individual aperture X Y Z mm mm mm mm mm
16.0 13.2 11.2
3.15 2.80 2.50
+ 0.99 + 0.86 + 0.77
± 0.49 ± 0.41 ± 0.35
+ 0.74 + 0.64 + 0.56
9.50 8.00 6.70
2.24 2.00 1.80
+ 0.68 + 0.60 + 0.53
± 0.30 ± 0.25 ± 0.21
+ 0.49 + 0.43 + 0.37
5.60 4.75 4.00
1.60 1.60 1.40
+ 0.47 + 0.42 + 0.37
± 0.18 ± 0.15 ± 0.13
+ 0.32 + 0.28 + 0.25
3.35 2.80 2.36
1.25 1.12 1.00
+ 0.32 + 0.29 + 0.25
± 0.11 ± 0.09 ± 0.08
+ 0.22 + 0.19 + 0.17
2.00 1.70 1.40
0.90 0.80 0.71
+ 0.23 + 0.20 + 0.18
± 0.07 ± 0.06 ± 0.05
+ 0.15 + 0.13 + 0.11
1.18 1.00
0.63 0.56
+ 0.16 + 0.14
± 0.04 ± 0.03
+ 0.10 + 0.09
µm
µm
µm
µm
µm
5 Perforated plates in test sieves 5.1 Arrangement of square holes Square holes shall be arranged in line with the centre points at the vertices of squares, as shown in Figure 5. 5.2 Arrangement of round holes Round holes shall be arranged with the centres at the apices of equilateral triangles, as shown in Figure 6. NOTE Plated mild steel is commonly supplied except at the lower end of the aperture range where brass may be found to be more suitable. The purchaser should state in the enquiry specific requirements, if any, for the material of the perforated plate.
5.3 Plate thickness Perforated plates shall be of uniform thickness and shall lie in the range given in Table 3. NOTE The nominal plate thicknesses stated in Table 3 are preferred.
5.4 Pitch The pitch shall be: a) the nominal pitch stated in Table 3; or b) up to 15 % larger than the nominal pitch stated in Table 3; or c) smaller than the nominal pitch stated in Table 3 provided that individual bridge widths comply with 5.5. 5.5 Bridge width
850 710 600
500 450 400
+ 127 + 112 + 101
± 29 ± 25 ± 21
+ 78 + 69 + 61
No individual bridge shall be less than half of the width given by subtracting the nominal aperture size from the nominal pitch.
500 425 355
315 280 224
+ 90 + 81 + 72
± 18 ± 15 ± 13
+ 54 + 48 + 43
NOTE
300 250 212
200 160 140
+ 65 + 58 + 52
± 12 ± 9.9 ± 8.7
+ 38 + 34 + 30
180 150 125
125 100 90
+ 47 + 43 + 38
± 7.6 ± 6.6 ± 5.8
+ 27 + 25 + 22
106 90 75
71 63 50
+ 35 + 32 + 29
± 5.2 ± 4.6 ± 4.1
+ 20 + 18 + 17
63 53 45
45 36 32
+ 26 + 24 + 22
± 3.7 ± 3.4 ± 3.1
+ 15 + 14 + 13
38 25 20
30 25 20
+ 20 + 16 + 14
± 2.9 ± 2.5 ± 2.3
+ 12 +9 +8
Minimum bridge widths are given in Table 3.
5.6 Workmanship Perforated plates shall be uniformly and cleanly punched. The radius at the corners of square holes shall not exceed 0.05W + 0.30 mm, where W is the aperture size expressed in millimetres. 5.7 Mounting The perforated plate shall be mounted with the punch entry side uppermost, i.e. burr down. The crevices above and below the plate at its junction with its frame shall be filled and left smooth. 5.8 Tolerances on aperture size Each aperture size of an unused sieve shall comply with the nominal size of the sieve within the limits of tolerance shown in Table 3. NOTE Aperture size is measured on the centre lines of square holes (see 5.1) and on the diameter of round holes (see 5.2).
NOTE The aperture sizes taken ISO 565. They are in an R40/3 series based on 1 mm with a ratio between successive sizes of about 1:2. The siazes in bold type are the principal sizes stated in ISO 565 and are preferred.
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BS 410:1986
5.9 Inspection 5.9.1 General. The manufacturer shall test each test sieve before sale and shall supply a record card (see Appendix D). NOTE The purchaser should state in his order when a more detailed test, i.e. a calibration test in accordance with Appendix F, is required.
5.9.2 Survey for condition. When tested in accordance with D.2, the perforated plate shall not show any obvious faults, e.g. irregularly formed holes, ragged edges and burrs upward. 5.9.3 Oversize apertures. When tested in accordance with D.3 and D.4 no aperture shall exceed the maximum dimension given in Table 3.
Figure 5 — Arrangement of square holes
Figure 6 — Arrangement of round holes
6
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BS 410:1986
Appendix A Information to be supplied with an enquiry and order The purchaser should state the following with an enquiry and order: a) the designation of the sieve (see 3.1); b) the sieving medium (i.e. woven wire cloth, square hole or round hole perforated plate); c) frame size and shape, and any other necessary details, e.g. nesting requirements (see 3.5) or wire diameter (see 4.2); d) any material requirements or restrictions for frame, sieving medium and fillets; whether statement of wire diameter is required (see 4.1 and 4.5); e) whether a receiver is required (see 3.3); f) whether a lid is required (see 3.3); g) whether a more detailed test is required (see 4.6.1 and 5.9.1).
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BS 410:1986
Table 3 — Perforated plate in test sieves: plate thickness, pitch of holes, minimum bridge width and tolerance on individual apertures a) Apertures in the range 125 mm to 4 mm; square hole and round hole Nominal aperture size R40/3 series mm
125
R/20 series mm
125 112
106 90.0
100 90.0 80.0
75.0 63.0
71.0 63.0 56.0
53.0 45.0
50.0 45.0 40.0
37.5 31.5
35.5 31.5 28.0
26.5 22.4
25.0 22.4 20.0
19.0 16.0
18.0 16.0 14.0
13.2 11.2
12.5 11.2 10.0
9.50 8.00
9.00 8.00 7.10
6.70 5.60
6.30 5.60 5.00
4.75 4.00
8
4.50 4.00
Plate thickness Nominala Max. mm
2.5 2.0 1.5 1.5
mm
Nominal pitch of holes
Minimum bridge width
Min. mm
mm
mm
mm
160
17.5
± 1.00
140 132
14.0 13.0 12.5
112 2.0
100 10.0
± 0.70
67
7.0
± 0.55 ± 0.55
5.5 50.0
47.5
± 0.50 5.0
5.0
± 0.45 ± 0.45
45.0
4.75
40.0
±0.40
4.25 35.5
33.5
± 0.40 3.75
3.5
± 0.35 ± 0.35
31.5
3.25
28.0
± 0.35
2.8 25.0
23.6
± 0.30 2.5
2.3
± 0.30 ± 0.29
22.4
2.2
20.0
± 0.28
2.0 18
17
± 0.27 2.0
1.9
± 0.26 ± 0.25
16
1.75
14
±0.24
1.4 12.6
12.1
± 0.23 1.3
1.3
± 0.21 ± 0.21
11.6
1.3
10.4
± 0.20
1.2 9.4
8.9
± 0.19 1.15
1.1
± 0.18 ± 0.17
8.5
1.1
7.7
± 0.17
1.05 6.9
6.6
± 0.15 0.95
0.93
± 0.14 ± 0.14
6.3 5.8
± 0.55
6.5
56.0
1.0
± 0.60 7.5
63
2.0
± 0.65
8.5 71
1.0
± 0.70
9.5
80
2.0
± 0.80 10.0
90
1.5
± 0.85
11.0
95
2.5
± 0.95 ± 0.90
125 3.0
Tolerance on individual apertures
0.9 0.9
± 0.14 ± 0.13
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BS 410:1986
Table 3 — Perforated plate in test sieves: plate thickness, pitch of holes, minimum bridge width and tolerance on individual apertures b) Round holes only in the range 3.55 mm to 1 mm Nominal aperture size R40/3 series mm
3.55 2.80 2.36 2.00 1.70 1.40 1.18 1.00
Plate thickness
R/20 series
Nominala
Max.
Min.
mm
mm
mm
mm
3.55 3.15 2.80 2.50 2.24 2.00 1.80 1.60 1.40 1.25 1.12 1.00
1.00
Nominal pitch of holes
Minimum bridge width
Tolerance on individual apertures
mm
mm
mm
5.2
5.0 1.25
0.8
4.35 3.75 3.3
0.5
3.0 0.63
0.4
4.7 3.9 3.6 3.1 2.75
2.6 2.4 2.0
2.45 2.22
0.83
0.83 0.78 0.7 0.65 0.65
0.78 0.7 0.67 0.65 0.58
0.6 0.6 0.5
0.6 0.55
± 0.12
± 0.11 ± 0.11 ± 0.11 ± 0.09 ± 0.08
± 0.11 ± 0.11 ± 0.10 ± 0.08 ± 0.08
± 0.08 ± 0.07 ± 0.07
± 0.08 ± 0.07
c) Non-ISO sizes; round holes only Nominal aperture size
Nominal
mm
mm
200b 180b 160b 140b 120 70 60 35 30 15 7.5
Plate thickness a
Max.
Min.
Nominal pitch of holes
Minimum bridge width
mm
mm
mm
mm
2.5
3.0
2.0
2.0
2.5
1.5
1.5
2.0
1.0
Tolerance on individual apertures mm
150 90 75 45 37.5 19
15 10 7.5 5 3.75 2.0
± 1.55 ± 1.40 ± 1.25 ± 1.10 ± 0.95 ± 0.65 ± 0.60 ± 0.40 ± 0.40 ± 0.27
10
1.25
± 0.19
NOTE 1 Bold type signifies preferred sizes. NOTE 2 The sizes listed under “Nominal aperture size” are the total specified by ISO 565 for perforated plate in test sieves. However, manufacturers of perforated plate test sieves may equip themselves for making only those sizes for which there is a demand sufficient to justify the expense of their tools. When particle sizes are being considered for products, enquiries should be made as to the stock position of test sieves, having the aperture size in mind. NOTE 3 The sizes listed under “Nominal aperture size” in the R40/3 series are based on 1 mm with a ratio between successive sizes of about 1:2 those in the R20 series have a ratio of about 1:12. The sizes in bold type are the principal sizes stated in ISO 565 and are preferred. a b
See note to 5.3 Test sieves of these aperture sizes may be made as single ring gauges. A minimum plate thickness of 3 mm is recommended.
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BS 410:1986
Appendix B Sieving areas and aperture tolerances expressed as percentages B.1 Sieving areas and aperture tolerances expressed as percentages are given in Table 4. Table 4 — Sieving areas and aperture tolerances expressed as percentages Nominal aperture size
Wire cloth
mm
%
125 112 106 100
Sieving areas Perforated plate Square hole Round hole %
%
Aperture tolerances expressed as percentages Wire cloth Perforated plate Maximum Average Intermediate X Y Z % % % % ± 0.8 ± 0.85 ± 0.85 ± 0.85
61 64 64 64
55 58 58 58
90.0 80.0 75.0
65 64 62
59 58 57
± 0.9 ± 0.9 ± 0.9
71.0
56
51
± 0.9
63.0 56.0 53.0 50.0
62 63 63 64
56 57 57 58
± 0.95 ±1 ±1 ±1
45.0 40.0 37.5 35.0
65 64 61 56
59 58 55 51
±1 ±1 ±1 ±1
31.5 38.0 26.5 25.0
62 62 63 63
56 56 57 57
± 1.5 ± 1.5 ± 1.5 ± 1.5
22.4 20.0 19.0 18.0
64 64 65 65
58 58 59 59
± 1.5 ± 1.5 ± 1.5 ± 1.5
64 60 60 61
58 54 55 55
+7
±3
+5
+7
±3
+5
64 61 61 60
58 55 55 54
+7
±3
+5
+7
±3
+5
57 57 52 55
52 52 47 50
+8
±3
+6
+ 8.5
±3
+6
49 52 47 51
44 47 43 46
+9
±3
+6
+9
±3
+6
44
40 42 38 40
+ 10
±3
+7
+ 10
±3
+7
16.0 14.0 13.2 12.5
70
11.2 10.0 9.5 9.00
67
8.00 7.10 6.70 6.30
64
5.60 5.00 4.75 4.50
60
4.00 3.55 3.35 3.15
55
10
68
65
62
56
53
± 1.5 ±2 ±2 ±2 ±2 ±2 ±2 ±2 ± 2.5 ± 2.5 ± 2.5 ± 2.5 ± 2.5 ± 2.5 ±3 ±3 ±3 ± 3.5 ± 3.5 ± 3.5
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BS 410:1986
Table 4 — Sieving areas and aperture tolerances expressed as percentages Nominal aperture size
mm 2.80 2.50 2.36 2.24
Wire cloth
%
Sieving areas Perforated plate Square hole Round hole %
51 49
2.00 1.80 1.70 1.60
48
1.40 1.25 1.18 1.12 1.00
44
% 35 37 34 35
46
43 41
Aperture tolerances expressed as percentages Wire cloth Perforated plate Maximum Average Intermediate X Y Z % % % % + 11 ±3 +7 ±4 ± 4.5 + 11 ±3 +7 ±4 ± 4.5
32 30 31 30
+ 12
±3
+8
+ 12
±3
+8
28 23 27 23 25
+ 13
±3
+8
+ 14
±3
+9
+ 15
±3
+9
± 4.5 ± 4.5 ± 5.5 ±5 ± 5.5 ± 6.5 ±7 ±6 ±7
120a
58
± 0.8
70a
55
± 0.9
60a
58
±1
35a
55
±1
30a
58
± 1.5
15a
57
±2
7.5a µm 850 710 600
40 37 36
500 425 355
51
± 2.5 +1 5 + 16 + 17
% ± 3.5 ±4 ±4
+9 + 10 + 11
38 36 38
+ 18 + 19 + 20
±4 ±4 ±4
+ 11 + 12 + 12
300 250 212
36 37 36
+ 21 + 22 + 24
±4 ±4 ± 4.5
+ 13 + 13 + 14
180 150 125
35 36 34
+ 24 + 26 + 29
±5 ±5 ±5
+ 15 + 16 + 17
106 90 75
36 35 36
+ 31 + 33 + 36
±5 ±5 ±5
+ 18 + 19 + 21
63 53 45
34 35 34
+ 39 + 43 + 43
±5 ±5 ±6
+ 22 + 24 + 27
38 32
31 28
+ 53 + 59
±6 ±8
+ 29 + 34
a
%
%
%
Non-ISO sizes; round hole perforated plate only.
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BS 410:1986
B.2 The formulae for calculating percentage sieving areas are as follows: a) woven wire cloth 2
W ----------------------- × 100 2 (W + d) b) square hole perforated plate 2
W -------- × 100 2 p c) round hole perforated plate 2
π (W ⁄ 2) -------------------------- × 100 0.866p
2
or 2
W -------- × 90.7 2 p where W is the nominal aperture size; d is the wire diameter (see Table 2); p is the pitch (see Table 3).
C.4 Variations of aperture size Check the proportion of apertures that exceed the intermediate limit, i.e. nominal aperture size + Z. Take measurements across the two diameters of the sieve frame, parallel to the warp and weft directions and/or in areas of irregular apertures as found from C.3. NOTE The measurements may be carried out rapidly using a limit gauge in the form of a scale (see Figure 7) or by individual gauges for coarser mesh sieves. At least 100 apertures should be observed, if possible, in each direction.
Record the number of apertures whose size in either the warp or weft direction falls within the tolerance band of (nominal + Z) and (nominal + Y) and express as a proportion of the total apertures checked. NOTE This method should be used to confirm that no apertures exceed the maximum of (nominal + X ); it may also be used to make an assessment of the distribution of the aperture width in the various tolerance bands, namely: less than (nominal – Y ) between (nominal – Y ) and (nominal + Y ) between (nominal + Y ) and (nominal + Z ) between (nominal + Z ) and (nominal + X )
NOTE The maximum aperture size specified in this standard for wire cloth is 16 mm; the minimum aperture size specified for square hole perforated plate is 4 mm, and the minimum aperture size specified for round hole perforated plate is 1 mm.
Appendix C Inspection of woven wire cloth C.1 Principle First a survey is made of the condition of the wire cloth, followed by a methodical examination of individual apertures and finally measurements are made of the average aperture size. The procedure for measurement of aperture size varies according to the size and number of apertures in the sieve (see C.4). C.2 Survey for condition Examine the wire cloth in the sieve for condition. NOTE For this survey a uniformly illuminated background is helpful.
C.3 Oversize apertures Examine all openings carefully and methodically in order to detect oversize apertures. Assess suspected oversize apertures in coarse sieves with an engineer’s limit gauge, segmental or calliper. NOTE 1 Apertures in fine sieves may best be viewed when magnified optically. In the case of fine sieves, lack of uniformity in aperture size can be seen in contrast with the general pattern of apertures of uniform size. NOTE 2 Typical indications are a line of large apertures, or local, noticeably irregular apertures. Record the location of such areas in question.
12
Figure 7 — Tolerance band gauge for optically magnified sieve cloth C.5 Average size of aperture Measure the average aperture size over at least 10 apertures, if possible, in each direction in each of at least two positions on the cloth. If the results from the two fields fall in different tolerance bands and if they contradict the information obtained from C.4, check the average aperture size at more positions on the sieving surface. C.6 Record card A suitable form of record card with specimen entries for a woven wire test sieve is given in Figure 8.
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BS 410:1986
Times used
Tester Date
New
ABC/86/10
Visual survey and maximum aperture
Average aperture size
Apertures above intermediate limits
Warp direction Weft direction Warp direction
Within ± Y
Within ± Y
Weft direction
Less than 6 % Less than 6 %
NOTE It is the ’s responsibility to ensure that a used sieve is re-examined. He, or a referee, should make retests according to the circumstances, and with a frequency appropriate to the degree of use that the sieve has undergone. For further information, see Appendix H of BS 410:1986.
Figure 8 — Record card for inspection of woven wire cloth test sieve
Appendix D Inspection of perforated plate D.1 Principle First a survey is made of the condition of the perforated plate, followed by a methodical examination of individual apertures and finally measurements are taken of individual aperture size. The procedure for measurement of aperture size varies according to the size and to the number of apertures in the sieve (see D.4). D.2 Survey for condition Examine the perforated plate in the sieve for condition. D.3 Oversize apertures Examine all openings carefully and methodically in order to detect oversize apertures. Assess suspected oversize apertures in coarse sieves with an engineer’s calliper or limit gauge, segmental or calliper.
Inspect every aperture; check square holes at mid-section in both directions across and check round holes across various diameters. Use either of the following procedures for the inspection. a) In any selected area check the holes along each of two straight lines of at least 100 mm length and including at least 10 holes, five along each direction. NOTE The lines should be at 90° or 60° for round holes, or at 90° for square holes.
b) For square holes, check holes along a line parallel to a diagonal of the holes for at least 150 mm and at least eight holes. If the plate has only 20 holes or less, check every hole. D.5 Record card A suitable form of record card with specimen entries for a perforated plate test sieve is given in Figure 9.
NOTE Apertures in finer sieves may be viewed when magnified optically.
Irregularity of bridge width is an indication of suspect apertures. D.4 Measurement of individual apertures Check individual apertures for compliance with the tolerances given in Table 3. NOTE Callipers, tapered plate gauges, segmental plain limit plug gauges, or optical projection may be used.
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BS 410:1986
Times used
New
Tester
ABC
Date
Visual survey
Compliance with the tolerances of BS 410
86/11
NOTE It is the ’s responsibility to ensure that a used test sieve is re-examined. He, or a referee, should make retests according to the circumstances, and with a frequency appropriate to the degree of use that the sieve has undergone. For further information see Appendix H of BS 410:1986.
Figure 9 — Record card for inspection of perforated plate test sieve
Appendix E Mesh number Wire cloth was traditionally designated by the weaver by the number of meshes per inch, called its mesh count or mesh number. This method was widely used and was, until 1962, the basic designation in BS 410. The usage in industry persists, particularly for the ready recognition of wire cloth by mesh count. However, sieves in accordance with BS 410 are now designated by aperture size, which is the relationship to particle size in a test sieve analysis. Table 5 is supplied only for information to relate mesh number readily to aperture size. The number of meshes per inch depends on the wire diameter for a given aperture size in wire cloth and a nominal mesh number should be taken as an approximation.
14
Table 5 — Mesh number (a) Nominal aperture size 5.60 mm to 1.00 mm Mesh number
Nominal aperture size
(b) Nominal aperture size 850 µm to 32 µm Mesh number
Nominal aperture size
mm
µm
3 3½ 4
5.60 4.75 4.00
18 22 25
850 710 600
5 6 7
3.35 2.80 2.36
30 36 44
500 425 355
8 10 12
2.00 1.70 1.40
52 60 72
300 250 212
14 16
1.18 1.00
85 100 120
180 150 125
150 170 200
106 90 75
240 300 350
63 53 45
400 440
38 32
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BS 410:1986
Appendix F Calibration tests F.1 General When more detailed information is required about the woven wire cloth or perforated plate in a test sieve, the acceptance test (see 4.6 and 5.9) should be supplemented as described in F.2. F.2 Woven wire cloth test sieves The measurement of the average aperture width should be made in a number of fields evenly spread over the whole area of the sieve, and so chosen that no two fields are crossed by the same wire (see Figure 10). The number of fields and the minimum number of apertures that should be measured in each field of a 200 mm diameter sieve frame, in both the warp and the weft direction separately, are given in Table 6.
Table 6 — Number of apertures to be measured in a 200 mm diameter test sieve Nominal aperture width
Number of Minimum number of consecutive apertures to be measured in fields each direction In each field
In all fields
mm
3.35 2.80 2.36
10 10 10
3 3 4
30 30 40
2.00 1.70 1.40
10 10 10
4 5 6
40 50 60
1.18 1.00
10 10
8 9
80 90
850
10
10
100
710 600 500
10 10 10
12 15 15
120 150 150
425 355 300
10 10 10
20 25 30
200 250 300
250 212 180
10
30
300
15
20
300
µm
150 125 106 90 75 63 Figure 10 — Fields of measurement in a 200 mm round test sieve
53 45 38 32
In the cases of 100 mm and 300 mm diameter sieve frames, the number of fields for measurement should be 4 and 15 respectively.
© BSI 01-1999
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Licensed Copy: Dong Su Lee, Hyundai Engineering Constructi, Fri Nov 02 05:21:57 GMT+00:00 2007, Uncontrolled Copy, (c) BSI
BS 410:1986
For aperture sizes larger than 3.35 mm, it is usual to check the size with engineers’ gauges, and 20 and 30 apertures may be assessed rapidly by this means. If a sieve has 20 apertures or less, then all apertures should be measured. If, when making this test, the measured average aperture width is found to be so uniform in the first few fields that the full recommended number of fields is not measured, then the result of the fields tested should be shown on the record card. F.3 Perforated plate test sieves When more detailed information is required about the apertures in the perforated plate in a test sieve, either more apertures should be checked by limit gauging or the dimensions of apertures should be measured directly. F.4 Checking with a reference sample Sieves can be checked by sieving known material and comparing the amount of residue on the sieve with that expected. Known material can be either: a) reference material with agreed particle size distribution; or b) a material that has also been sieved on a set of master test sieves reserved for this checking operation. NOTE For information on the availability of powders with certified particle size distribution, apply to one of the following bodies. 1) Community Bureau of Reference BCR Rue de la Loi 200 B1049 Brussels 2) National Bureau of Standards Washington DC 20234 USA 3) Office of Reference Materials Laboratory of the Government Chemist Queens Road
Appendix G Maintenance of test sieves G.1 Before each use the sieving medium and frame should be inspected and if necessary cleaned. The cleaning of the sieve should be carried out with great care so that the sieving medium is not damaged. The sieving medium should not be fingered.
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G.2 Occasionally sieves may be washed in warm deionized water containing a liquid synthetic detergent. After washing, the sieves should be rinsed thoroughly in deionized water and dried at a temperature not exceeding 80 °C. It is important to note that test sieves should not be heated to high temperature. The sieves may be cleaned by immersing in a suitable liquid, e.g. alcohol or deionized water in an ultrasonic bath and treated for 15 s to 20 s with a frequency not less than 30 kHz and power input not exceeding 60 W/L. G.3 Wire mesh test sieves, particularly those with a nominal aperture size smaller than 3.35 mm, should not be brushed or exposed to compressed air.
Appendix H Used sieves H.1 ’s tests on used sieves The sizes and tolerances in this standard apply to new sieves. With continued use, test sieves will wear; it is therefore necessary for the apertures to be remeasured from time to time. If the is not prepared to make such periodic reinspections, recourse may be made to specialists in testing. H.2 Wear allowances on test sieves The tolerances on sieve apertures are determined by the degree of closeness to nominal values attainable in current manufacturing practice. Increases in aperture size (due to wear) which may be acceptable in service are determined by the requirements of the product, and may well be included in the product specification. They are not necessarily the same as the manufacturing tolerance. H.3 Applicability of marking The designation “TEST SIEVE TO BS 410” is not applicable when the apertures of a test sieve no longer comply with the appropriate tolerances according to the marking on the label on the sieve frame (see 3.6).
© BSI 01-1999
Licensed Copy: Dong Su Lee, Hyundai Engineering Constructi, Fri Nov 02 05:21:57 GMT+00:00 2007, Uncontrolled Copy, (c) BSI
BS 410:1986
Publications referred to BS 1796, Method for test sieving. ISO 565, Test sieves — Woven metal wire cloth, perforated plate and electroformed sheet — Nominal sizes of openings. ISO 2395, Test sieves and test sieving — Vocabulary.
© BSI 01-1999
Licensed Copy: Dong Su Lee, Hyundai Engineering Constructi, Fri Nov 02 05:21:57 GMT+00:00 2007, Uncontrolled Copy, (c) BSI
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