BS 410 1986 - Specification For Test Sieves [PDF]

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BRITISH STANDARD



BS 410:1986 Incorporating Amendment No. 1



I S B ) (c , y p o C d e ll o tr n o c n



Specification for



Test sieves



U , 7 0 0 2 0 0 : 0 0 + T M G 7 5 : 1 2 : 5 0 2 0 v o N ir F ti, c u tr s n o C g in r e e in g n E i a d n u y H , e e L u S g n o D : y p o C d e s n e c i L



UDC 621.928.2:620.168.32



BS 410:1986



I S B ) (c , y p o C d e ll o tr n o c n



Committees responsible for this British Standard



U , 7 0 0 2 0 0 : 0 0 + T M G 7 5 : 1 2 : 5 0 2 0 v o N ir F ti, c u tr s n o C g in r e e in This British Standard, having g n been prepared under the E direction of the General i Mechanical Engineering a Committee, was d Standards n published under the authority u of the Board of BS I and comes y into effect on H 31 March 1986 , e e L © BSI 01-1999 u First published April 1931



British Ceramic Society British Laboratory Ware Association



S g n o D : y p o C d e s n e c i L



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



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



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 panels: Institution of Mining Engineers Oil and Colour Chemists Association University of Bradford



Amendments issued since publication Amd. No.



Date of issue



Comments



8255



July 1994



Indicated by a sideline in the margin



BS 410:1986



Contents



I S B ) (c , y p o C d e ll o tr n o c n



Committeesresponsible Foreword 1 2 3 4



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Page Insidefrontcover ii



Scope Definitions Sievedesignation,constructionandmarking Woven wire cloth in test sieves



1 1 2 2



5 Perforatedplatesintestsieves Appendix A Information to be supplied with an enquiry and order Appendix B Sieving areas and aperture tolerances expressed percentages as 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 Figure — 1Weaves of wire cloth Figure2—Lidandreceiverforroundtestsieves Figure — Specimen 3 label Figure4—Measurementofwovenwireaperturesize Figure5—Arrangementofsquareholes Figure6—Arrangementofroundholes



5



7



10 12 13 14 15 16 16 2 3 4 4 6 6



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



12 13 14 15



Table1—Dimensionsofroundtestsieveframes 3 Table 2 — Wire cloth in test sieves: wire diameter and tolerances apertures on 5 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 percentages as 10 Table Mesh —5 number 14 Table 6 — Number of apertures to be measured in a 200 mm diameter test sieve 15 Publicationsreferredto



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Insidebackcover



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i



BS 410:1986



I S B ) (c , y p o C d e ll o tr n o c n



Foreword



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retained and others of larger size than is required by ISO/TC 24, are also included [see Table 3 c)].



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



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. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations.



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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.



© BSI 01-1999



BS 410:1986



I S B ) (c , y p o C d e ll o tr n o c n



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.



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NOTE The titles of the publications referred to in this standard are listed on the inside back cover.



S g n o D : y p o C d e s n e c i L



aperture size the dimension defining an opening



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 supports 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 passing fraction 2.7



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.



© BSI 01-1999



1



BS 410:1986



I S B ) (c , y p o C d e ll o tr n o c n



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 contact 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 U , is prevented. 7 0 3.6 Marking 0 2 A label shall be permanently attached to the frame 0 of each sieve complying with this standard, legibly 0 : 0 marked with the following information 0 (see Figure 3). + T a) The designation. The figures shall be bold, and M preferably not less than 5 mm tall, on the left side G 7 of the label. 5 : b) The wording “TEST SIEVE TO BS 410:1986”3). 1 2 : c) The material of the wire cloth or of the 5 0 perforated plate. 2 d) The material of the sieve frame. 0 v e) The maker’s name or trade mark. o Figure 1 — Weaves of wire cloth N f) An identification number. ir g) If required, the wire diameter. F Sieve designation, construction and ti, 3 NOTE The purchaser should state in the enquiry and order c marking (see Appendix A) if this marking is required. u tr 3.1 Designation s 4 Woven wire cloth in test sieves n Test sieves shall be designated by the nominal o 4.1 Material C aperture size, which is the nominal central g separation of opposite sides of a square aperture or Wires in test sieves shall not be plated. in r the nominal diameter of a round (circular) aperture. NOTE 1 The material for woven wire cloth is not specified. e e The type of hole, square or round, in perforated The following materials are commonly supplied. in plate shall be stated. Material Range of aperture size for which g n 3.2 Sieve frames suitable E Phosphor bronze Less than 250 µm i The dimensions of round sieve frames shall be as a Brass 250 µmto166 mm d given in Table 1. n Stainless steel All sizes u NOTE 1 Frames should be made of brass, plated steel or y NOTE 2 The purchaser should state in the enquiry and order H stainless steel. , NOTE 2 The appropriate sieving medium is included in Table 1. (see Appendix A) specific requirements, if any, for the material of the wire cloth. e NOTE 3 For special purpose sieving, other shapes of frame are e 4.2 Wire L available. u 3.3 Lid and receiver Afterdiameter the cloth at is different mounted positions in the sieve, the the average S wire across g When required for round sieves, lids and receivers n sieving surface shall be uniform so that the limits on o shall be of the same metal and gauge as the sieves aperture size can be satisfied. D (see Figure 2). : y 3.4 Finish A band of choice of ± 15 % about the wire diameters p given in Table 2 is permitted. o Test sieves, receivers and lids shall be smoothly C d finished. e s n 3) e Marking BS 410:1986 on or in relation to a product is a claim by the manufacturer that the product has been manufactured in c i accordance with the requirements of the standard. The accuracy of such a claim is therefore solely the manufacturer’s L responsibility. Enquiries as to the availability of third party certification should be addressed to the appropriate certification body.



2



© BSI 01-1999



BS 410:1986



I S B ) (c , y p o C d e ll o tr n o c n U , 7 0 0 2 0 0 : 0 0 + T M G 7 5 : 1 2 : 5 0 2 0 v o N ir F ti, c u tr s n o C g in r e e in g n E i a d n u y H , e e L u



Table 1 — Dimensions of round test sieve frames



Nominal diameter, D and d



Tolerance



mm



100 200 300 450



a When



Diameter of sieving surface



Nominal depth, H



D



d



min.



ma x .



Full



mm



mm



mm



mm



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



Appropriate sieving medi um



Half mm



90



100



40



20



Wire cloth



185



200



50



25



Wireclothorperforatedplate



275



300



75



40



Wire clotha or perforated plate



425



450



Notless than



—



Wire clotha or perforated plate



100 fine wire cloth is used in large diameter sieves, it should be supported by means of a support mesh or spider.



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Figure 2 — Lid and receiver for round test sieves



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BS 410:1986



I S B ) (c , y p o C d e ll o tr n o c n U , 7 0 Figure 3 — Specimen label 0 2 NOTE 1 Aperture tolerances, expressed as percentages, are 0 4.3 Weave 0 given in Appendix B. : 0 Wire cloth shall be woven to produce nominally NOTE 2 If the p urchaser requires a tol erance on 0 uniform square apertures in accordance with 4.5. perpendicularity, this should be included in the order. No + tolerance on perpendicularity of warp and weft wires is specified T Wire cloth in sieves with a nominal aperture size in this standard since users’ requirements may differ according M of 75 µm and greater shall be plain woven. to the material to be tes ted. A tolerance of ± 3° from G perpendicularity may be acceptable in many cases and a visual 7 Wire cloth in sieves with a nominal aperture inspection of general appearance of perpendicularity may be 5 : of 63 µm and smaller shall be either twilled or plain acceptable in other cases. It should be recognized that a test 1 2 should apply to the general directions of the warp and weft wires : woven. over several apertures and not to a single aperture. 5 0 For aperture sizes of 4.00 mm and greater, the wire 4.6 Inspection 2 shall be crimped before weaving. 0 4.6.1 General. The manufacturer shall test each test v 4.4 Mounting o sieve before sale and supply a record card N The wire cloth shall be so mounted in the frame as (see Appendix C). ir to be held firmly and equally taut in all directions NOTE The purchaser should state in his order when a more F detailed test, i.e. a calibration test in accordance with ti, without any distortion of the mesh. Appendix F, is required to be made by the manufacturer. c 4.5 Tolerances on aperture size u Tests shall be made with respect to each of three tr 4.5.1 General. The measured aperture size before s n the sieve is used shall comply with the nominal size tolerances X, Y and Z as listed in Table 2. o 4.6.2 Survey for condition. When tested in C within tolerances X, Y, and Z given in Table 2. g Aperture size is measured on the centre lines of the accordance with C.2, the sieve shall not show any obvious faults, e.g. weaving defects such as loose in r aperture (see Figure 4) and the tolerances shall wire, creases and wrinkles. Part apertures are likely e apply to the warp and weft directions separately. e to be found round the periphery but if any blinded in apertures away from the periphery are found the g n sieve shall be deemed not to comply with the E i requirements of this standard. a d 4.6.3 Oversize apertures. When tested in accordance n u with C.3, no aperture shall exceed the maximum y dimension given in 4.5.2. H , 4.6.4 Variations of aperture size. When tested in e e accordance with C.4 and C.5, the proportion of L apertures exceeding the intermediate limit shall be u S g n o D : y p o C d e s n e c i L



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.



not greater than that given in 4.5.4. NOTE Tolerance + X ensures that no individual aperture exceeds a maximu m limit; toleran ce ± 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.



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



© BSI 01-1999



BS 410:1986



I S B ) (c , y p o C d e ll o tr n o c n U , 7 0 0 2 0 0 : 0 0 + T M G 7 5 : 1 2 : 5 0 2 0 v o N ir F ti, c u tr s n o C g in r e e in g n E i a d n u y H , e e L u S g n o D : y p o C d e s n e c i L



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 aperture wire diameter Maximum Tolerance Intermediate size tolerance for tolerance in test for size of average sieve an aperture individual aperture mm



16.0 13.2 11.2



mm



X mm



Y mm



Z mm



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 pitchbridge statedwidths in Table 3 provided that individual 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



71



+ 35



5.2 ±



90 75



63 50



+ 32 + 29



± 4.6 ± 4.1



+ 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



+ 20



Minimum bridge widths are gi ven in Ta ble 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.



© BSI 01-1999



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BS 410:1986



I S B ) (c , y 5.9 Inspection p o 5.9.1 General. The manufacturer shall test each test C sieve before sale and shall supply a record card d lle (see Appendix D). o NOTE The purchaser should state in his order when a more tr detailed test, i.e. a calibration test in accordance with n o Appendix F, is required. c n 5.9.2 Survey for condition. When tested in U , accordance with D.2, the perforated plate shall not 7 show any obvious faults, e.g. irregularly formed 0 0 holes, ragged edges and burrs upward. 2 0 5.9.3 Oversize apertures. When tested in accordance 0 : with D.3 and D.4 no aperture shall exceed the 0 maximum dimension given in Table 3. 0 + T M G 7 5 : 1 2 : 5 0 2 0 v o N ir F ti, c u tr s n o C g in r e e in g n E i a d n u y H , e e L u S g n o D : y p o C d e s n e c i L



Figure 5 — Arrangement of square holes



Figure 6 — Arrangement of round holes



6



© BSI 01-1999



BS 410:1986



I S B ) (c , y p o C d e ll o tr n o c n U , 7 0 0 2 0 0 : 0 0 + T M G 7 5 : 1 2 : 5 0 2 0 v o N ir F ti, c u tr s n o C g in r e e in g n E i a d n u y H , e e L u



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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© BSI 01-1999



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BS 410:1986



I S B ) (c , y Table 3 — Perforated plate in test sieves: plate thickness, pitch of holes, minimum p bridge width and tolerance on individual apertures o C a) Apertures in the range 125 mm to 4 mm; square hole and round hole d e Nominal Plate t hickness Nominal p itch o f h oles Minimum b ridge Tolerance on ll aperture size width individual apertures o tr a R/20 Nominal Max. Min. n R40/3 series o series c mm mm mm mm mm mm mm mm n 125 160 17.5 1.00 ± U , 125  7  112 140 14.0 0.95± 0  0 106 132 13.0 0.90±  2  100 125 12.5 0.85± 0  0 :  90.0 112 11.0 0.80 ± 0 90.0  0 80.0 3.0 2.0 100 10.0 0.70 ±  2.5 +  T 75.0 95 10.0 0.70±  M  71.0 90 9.5 0.65 ±  G  63.06 3.0 80 8.5 0.60 ± 7  5 : 56.0 71 7.5 0.55 ±  1  2 53.0 67 7.0 0.55 ± :  5  50.0 63 6.5 0.55 ± 0 2 45.0 45.0 56.0 5.5 0.50 ±  0  40.0 50.0 5.0 0.45± v  o 37.5  47.5 5.0 0.45 ± N  ir 35.5 45.0 4.75 ±0.40  F  31.5 31.5 40.0 4.25 0.40 ± ti,  28.0 35.5 3.75 0.35 ± c  u 26.5 33.5 3.5 0.35 ±  tr s  2.0 25.0 2.5 1.5 31.5 3.25 0.35 ± n  o 22.4  22.4 28.0 2.8 0.30 ± C  20.0 25.0 2.5 0.30±  g  in 19.0 23.6 2.3 0.29 ± r  e  18.0 22.4 2.2 0.28± e  in 16.0 16.0 20.0 2.0 0.27 ±  g n 14.0 18 2.0 0.26 ±  E  i 13.2 17 1.9 0.25± a  d  12.5 16 1.75 ±0.24 n  u 11.2 11.2 2.0 1.0 14 1.4 0.23 ±  1.5 y  10.0 12.6 1.3 0.21± H  ,  9.50 12.1 1.3 0.21 ± e  e 9.00  11.6 1.3 0.20± L u 8.00 8.00  10.4 1.2 0.19 ± S g n o D : y p o C d e s n e c i L



7.10 6.70 5.60



6.30 5.60 5.00



4.75 4.00



8



4.50 4.00



      1.5        



9.4 8.9



1.15 0.17± 1.1



1.1 8.5



2.0



1.0



7.7



1.05 6.9



6.6



0.95 0.14 ± 0.9



0.93 6.3 5.8



0.9



0.18± 0.17± 0.15 ± 0.14± 0.14± 0.13 ±



© BSI 01-1999



BS 410:1986



I S B ) (c , y p o C d e ll o tr n o c n U , 7 0 0 2 0 0 : 0 0 + T M G 7 5 : 1 2 : 5 0 2 0 v o N ir F ti, c u tr s n o C g in r e e in g n E i a d n u y H , e e L u S g n o D : y p o C d e s n e c i L



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



R/20 series



mm



3.55 2.80



mm



3.55 3.15 2.80 2.50



2.36 2.00



2.24 2.00 1.80



1.70 1.40



1.60 1.40 1.25



1.18 1.00



1.12 1.00



Plate thickness



Nominal pitch of holes



Nominala



M ax.



Min.



mm



mm



mm



     1.00            0.5        



Minimum bridge width



Tolerance on individual apertures



mm



mm



mm



5.2



5.0



0.83 0.11 ± 0.78



0.83



4.7 1.25



0.8



4.35



0.11± 0.11 ± 0.11±



0.78 3.9



3.75



0.7 0.7



0.11 ± 0.67



3.6 3.3



0.65 3.1



3.0



0.10± 0.09 ±



0.65 0.08 ± 0.58



0.65 2.75



0.63



0.12±



0.08± 0.08 ±



0.4 2.6



0.6 2.45



2.4



0.08 ± 0.6



0.6 2.22 2.0



0.08±



0.07± 0.55 0.5



0.07 ± 0.07 ±



c) Non-ISO sizes; round holes only Nominal aperture size mm



200b 180b 160b 140b 120 70 60 35 30 15 7.5



Plate thickness Min. Nominala Max. mm



mm



Nominal pitch of holes



mm



  2.5 



3.0



2.0



  2.0 



2.5



1.5



1.5



2.0



1.0



Minimum bridge width



Tolerance on individual apertures



mm



mm



mm



150 90 75 45 37.5 19



15 10 7.5 5 3.75 2.0



10



1.25



± 1.55 ± 1.40 ± 1.25 ± 1.10 0.95 ± 0.65 ± 0.60 ± 0.40 ± 0.40 ± 0.27 ± 0.19 ±



NOTE 1 Bold type signifies preferred sizes. NOTE 2 The sizes listed un der “Nominal aperture size” are the tota l specified by ISO 565 for per forated plate in test sieve s. 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 thesizes stocklist position of test sieves, having the aperture size in mind. NOTEas 3 toThe ed under “Nom inal aperture size” in th e R40/3 series are based on 1 mm with a rat io between suc cessive 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.



© BSI 01-1999



9



BS 410:1986



I S B ) (c Appendix B Sieving areas and aperture tolerances expressed as percentages , y p o B.1 Sieving areas and aperture tolerances C expressed as percentages are given in Table 4. d Table 4 — Sieving areas and aperture tolerances expressed as percentages e ll o Nominal Sieving areas Aperture tolerances expressed as percentages tr aperture size Wire cloth Perforated plate Wire cloth Perforated plate n Square hole Round hole Maximum Average Intermediate o c X Y Z n U , 7 0 0 2 0 0 : 0 0 + T M G 7 5 : 1 2 : 5 0 2 0 v o N ir F ti, c u tr s n o C g in r e e in g n E i a d n u y H , e e L u



125 112 106 100



mm



%



61 64 64 64



%



55 58 58 58



%



%



%%



0.8 0.85 0.85 0.85



± ± ± ±



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



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



64 61 61 60



58 55 55 54



0.95



16.0 14.0 13.2 12.5



70



11.2 10.0 9.5 9.00



67



8.00



64



57



52



8 +



3 ±



62



57 52 55



52 47 50



8.5+



3 ±



49 52 47 51



44 47 43 46



9 +



3 ±



9 +



3 ±



44



40 42 38 40



S g n o D : y p o C d e s n e c i L



7.10 6.70 6.30



10



68



65



5.60 5.00 4.75 4.50



60



4.00 3.55 3.35 3.15



55



56



53



7 + 7 +



7 + 7



+



3 ± 3



3 3



±



±



5 +



1.5±



5 +



2



5 +



± 5



+



2 2



2



±



2



±



2



±



2



±



±



± ±



6 +



2.5±



6 +



2.5



±



2.5



±



2.5



±



2.5±



6 + 6 +



%



2.5± 3



±



10 +



3 ±



7 +



3 ±



10 +



3 ±



7 +



3.5±



3



±



3.5



±



3.5



±



© BSI 01-1999



BS 410:1986



I S B ) (c , y p o C d e ll o tr n o c n U , 7 0 0 2 0 0 : 0 0 + T M G 7 5 : 1 2 : 5 0 2 0 v o N ir F ti, c u tr s n o C g in r e e in g n E i a d n u y H , e e L u S g n o D : y p o C d e s n e c i L



Table 4 — Sieving areas and aperture tolerances expressed as percentages Nominal aperture size



Wire cloth



%



Sieving areas Perforated plate Square hole Round hole %



mm 2.80 2.50



51



35 37



2.36 2.24



49



34 35



11 +



2.00 1.80 1.70 1.60



48



32 30 31 30



12 +



3 ±



8 +



4.5±



12 +



3 ±



8 +



5.5±



1.40 1.25 1.18 1.12 1.00



44



28 23 27 23 25



13 +



46



43 41



%



Aperture tolerances expressed as percentages Wire cloth Perforated plate Maximum Average Intermediate X Y Z % % % % 11 + 3 ± 7 + 4 ± 4.5 ± 3



±



7



+



4



±



4.5



±



4.5



±



5 3 ±



8 +



±



5.5± 6.5



14 +



3



±



9



+



7



±



15 +



3



±



9



+



7



±



6



± ±



120a



58



0.8



±



70a



55



0.9



±



60a



58



1



35a



55



1



30a



58



15a



57



2



40 37 36



% 5 +1 3.5 ± 9 + 16 + 4 ±10 + 17 + 4 ±11 +



500 425 355



38 36 38



18 19 20



300 250 212



36 37 36



21 + 4 ±13 + 22 + 4 ±13 + 24 + 4.5 ± 14 +



180 150 125



35 36 34



24 26 29



+ 5 + 5 + 5



106 90 75



36 35 36



31 33 36



+ 5 +5 +5



±18 + 19 ± + 21 ± +



63



34



39



+5



22 ±



+



53 45



35 34



43 43



+5 +6



24 ± 27 ±



+ +



38 32



31 28



53 59



+6 +8



29 ± 34 ±



+ +



a



± 1.5



7.5a µm 850 710 600



51 %



±



± 2.5



+ 4 + 4 + 4



±11 ±12 ±12



±15 ±16 ±17



%



± ±



%



+ + +



+ + +



Non-ISO sizes; round hole perforated plate only.



© BSI 01-1999



11



BS 410:1986



I S B ) (c , y B.2 The formulae for calculating percentage sieving p o areas are as follows: C a) woven wire cloth d lle 2 W o ------------- × 100 2 tr (W + d) n o c b) square hole perforated plate n



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.



U , W2 × -------- 100 7 2 0 p 0 2 c) round hole perforated plate 0 0 : 2 π-------------------------( W ⁄ 2 ) × 100 0 0 2 + 0.866 p T M or G 2 7 W -------- × 90.7 5 : 2 1 p 2 : 5 where 0 W is the nominal aperture size; 2 0 d is the wire diameter (see Table 2); v o p is the pitch (see Table 3). N ir NOTE The maximum aperture size specified in this standard F for wire cloth is 16 mm; the minimum aperture size specified for ti, square hole perforated plate is 4 mm, and the minimum aperture c size specified for round hole perforated plate is 1 mm. u tr s Appendix C Inspection of woven wire n o cloth C g C.1 Principle in r e First a survey is made of the condition of the wire e cloth, followed by a methodical examination of in g individual apertures and finally measurements are n E made of the average aperture size. i The procedure for measurement of aperture size a d varies according to the size and number of apertures n u in the sieve (see C.4). y H C.2 Survey for condition , e Examine the wire cloth in the sieve for condition. e L NOTE For this survey a uniformly illuminated background is u helpful.



NOTEgauge Theinmeasurements may be carried using a limit the form of a scale (see Figureout 7) rapidly or by individual gauges for coarser mesh sieves. At least 100 apertures should be observed, if possible, in each direction.



S g n o D : y p o C d e s n e c i L



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.



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.



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.



A suitable form of record card with specimen entries for a woven wire test sieve is given in Figure 8.



12



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 )



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



C.6 Record card



© BSI 01-1999



BS 410:1986



I S B ) (c , y p o C d e ll o tr n o c n U , 7 0 0 2 0 0 : 0 0 + T M G 7 5 : 1 2 : 5 0 2 0 v o N ir F ti, c u tr s n o C g in r e e in g n E i a d n u y H , e e L u S g n o D : y p o C d e s n e c i L



Times used



Tester Date



New



Visual survey and maximum aperture



Average aperture size



Apertures above intermediate limits



Warp direction Weft direction Warp direction



ABC/86/10



Within± Y



Within ± Y



Weft direction



Less than 6 % Less than 6 %



NOTE It is the user’ s responsibility to ensure tha t a used sieve is re-e xamined. 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



Inspect every aperture; check square holes at mid-section in both directions across and check round holes across various diameters.



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.



Use either of the following procedures for the inspection.



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



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.



calliper.



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.



© BSI 01-1999



13



BS 410:1986



I S B ) (c , y p o C d e ll o tr n o c n U , Times used Tester Date Visual survey Compliance with the tolerances of BS 410 7 0 New ABC 86/11 0 2 0 0 : 0 0 + T M NOTE It is the user’s resp onsibility to ensure tha t a used test sieve is re-exam ined. He, or a referee , should make ret ests G according to the circumstances, and with a frequency appropriate to the degree of use that the sieve has undergone. For 7 further information see Appendix H of BS 410:1986. 5 : Figure 9 — Record card for inspection of perforated plate test sieve 1 2 : 5 Table 5 — Mesh number 0 Appendix E Mesh number 2 (a) Nominal aperture (b) Nominal aperture 0 Wire cloth was traditionally designated by the size 5.60 mm to 1.00 mm size 850 µm to 32 µm v o weaver by the number of meshes per inch, called its Mesh Nominal Mesh Nominal N mesh count or mesh number. This method was aperture aperture number number ir size size F widely used and was, until 1962, the basic mm µm designation in BS 410. The usage in industry ti, 3 5.60 18 850 c persists, particularly for the ready recognition of u 3½ 4.75 22 710 tr wire cloth by mesh count. s 4 4.00 25 600 n However, sieves in accordance with BS 410 are now o C designated by aperture size, which is the 5 3.35 30 500 g relationship to particle size in a test sieve analysis. in 6 2.80 36 425 r Table 5 is supplied only for information to relate e mesh number readily to aperture size. The number 7 2.36 44 355 e n i of meshes per inch depends on the wire diameter for g n a given aperture size in wire cloth and a nominal 8 2.00 52 300 E mesh number should be taken as an approximation. i 10 1.70 60 250 a d 12 1.40 72 212 n u y 14 1.18 85 180 H , 16 1.00 100 150 e e 120 125 L u S g n o D : y p o C d e s n e c i L



14



150 170 200



106 90 75



240 300 350



63 53 45



400 440



38 32



© BSI 01-1999



BS 410:1986



I S B ) (c , y p o C d e ll o tr n o c n U , 7 0 0 2 0 0 : 0 0 + T M G 7 5 : 1 2 : 5 0 2 0 v o N ir F ti, c u tr s n o C g in r e e in g n E i a d n u y H , e e L u S g n o D : y p o C d e s n e c i L



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 field s 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



10 10



12 15



120 150



500



10



15



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



15



BS 410:1986



I S B ) (c , y p o C d e ll o tr n o c n



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 U , fields is not measured, then the result of the fields 7 tested should be shown on the record card. 0 0 F.3 Perforated plate test sieves 2 0 When more detailed information is required about 0 : the apertures in the perforated plate in a test sieve, 0 0 either more apertures should be checked by limit + T gauging or the dimensions of apertures should be M measured directly. G F.4 Checking with a reference sample 7 5 : Sieves can be checked by sieving known material 1 and comparing the amount of residue on the sieve 2 : 5 with that expected. Known material can be either: 0 a) reference material with agreed particle size 2 distribution; or 0 v b) a material that has also been sieved on a set of o N master test sieves reserved for this checking ir operation. F



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



it, c u tr s n o C g in r e e in g n E i a d n u y H , e e L u



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.



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 S g fingered. n o D : y p o C d e s n e c i L



16



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 User’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 user is not prepared to make such periodic reinspections, recourse may be made to specialists in testing. H.2 Wear allowances on test sieves



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



BS 410:1986



I S B ) (c , y p o C d e ll o tr n o c n



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.



U , 7 0 0 2 0 0 : 0 0 + T M G 7 5 : 1 2 : 5 0 2 0 v o N ir F ti, c u tr s n o C g in r e e in g n E i a d n u y H , e e L u S g n o D : y p o C d e s n e c i L



© BSI 01-1999



I S B ) (c , y p o C d e ll o tr n o c n U , 7 0 0 2 0 0 : 0 0 + T M G 7 5 : 1 2 : 5 0 2 0 v o N ir F ti, c u tr s n o C g in r e e in g n E i a d n u y H , e e L u S g n o D : y p o C d BSI e 389 Chiswick High Road s n London e c i W4 4AL L



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