MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG, NEW DELHI पर क षण छलन व मशष ट भ ग 2 तछद र त पल छलन स क भ रत य नक स द थ प नर क षण IS 460 (भ ग 2)

Transcription

1 MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG, NEW DELHI वय पक परर लन स द ह र स दभ स ईड 55/ -2 28/01/2019 त कन क सम तत: छलन, तछन ई और अन य तछन ई पद ततय व षय सम तत, CED55 प र प त कत : मसव ल इ ज तनयर व भ ग पररषद क सभ सदस य स ईड 55 क सभ सदस य र च रखन ल अन य तनक य ह दय(य ), तनम नमलखखत नक क स श धन क स द स लग न ह : प रल ख स ख य स ईड 55 (12450) श षक पर क षण छलन व मशष ट भ ग 2 तछद र त पल छलन स क भ रत य नक स द थ प नर क षण IS 460 (भ ग 2) I.C.S क पय इन नक क स द क अ ल कन कर और अपन सम ततय यह बत त ह ए भ ज कक यद रद य नक क र प प रक मशत ह त इन पर अ ल करन आपक व य स य अथ क र ब र क य कद र न इय आ सकत ह सम ततय भ जन क अ तत ततचथ : 28/02/2019. सम तत यद रद क ई ह त क पय अध हस त क षर क उपररमलखखत पत पर स लग न फ भ ज य manoj@bis.gov.in पर ई ल कर द यद रद क ई सम तत प र पत नह ह त ह अथ सम तत क ल भ ष समबन ध त र द र ह ई त उपर कत प रल ख क यथ त अ तत र प द रदय ज एग यद रद सष म त तकन क प रक तत क ह ई व षय सम तत क अध यक ष क पर श स अथ उनक इच छ पर आग क क य ह क मलए व षय सम तत क भ ज ज न क ब द प रल ख क अ तत र प द द रदय ज एग यह प रल ख भ रत य नक ब य र क बस इ पर भ उपलब ध ह उपर मलखखत धन य द भ द य, (स जय प त) प र ख (मसव ल इ ज तनयर )

2 MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG, NEW DELHI DRAFT IN WIDE CIRCULATION Reference Date CED 55/T-2 28/01/2019 TECHNICAL COMMITTEE: Sieves, Sieving and Other Sizing Methods Sectional Committee, CED 55 ADDRESSED TO: All Interested Members of Civil Engineering Division Council, CEDC All Members of CED 55 All others interested Doc No. CED 55 (12450) Title Draft for Indian Standard Test Sieves Specification Part 2 Perforated Plate Test Sieves Fourth Revision of IS 460 (Part 2) ICS No Kindly examine the draft standard and forward your views stating any difficulties which you are likely to experience in your business or profession, if this is finally adopted as National Standard. Last Date for comments 28/02/2019 Comments if any, may please be made in the attached format and mailed to the undersigned at the above address or preferably through e- mail to manoj@bis.gov.in. In case no comments are received or comments received are of editorial nature, you may kindly permit us to presume your approval for the above document as finalized. However, in case of comments of technical in nature are received then it may be finalized either in consultation with the Chairman, Sectional Committee or referred to the Sectional Committee for further necessary action if so desired by the Chairman, Sectional Committee. The document is also hosted on BIS website Thanking you, Yours faithfully, (Sanjay Pant) Encl: as above Head (Civil Engineering)

3 FORMAT FOR SENDING COMMENTS ON BIS DOCUMENTS (Please use A-4 size sheet of paper only and type within fields indicated. Comments on each clause/sub-clause/table/fig etc. be started on a fresh box. Information in column 3 should include reasons for the comments and suggestions for modified working of the clauses when the existing text is found not acceptable. Adherence to this format facilitates Secretariat s work) {Please your comments to manoj@bis.gov.in DOC. NO. & TITLE: CED 55(12450) Wide Circulation Draft for Test Sieves Specification: Part 2: Perforated Plate Test Sieves LAST DATE OF COMMENT: 28/02/2019. NAME OF THE COMMENTATOR/ORGANIZATION: Sl. No. Clause/Para/Table/ Figure No. Commented Comments/Modified Wordings Justification of the Proposed Change DRAFT FOR COMMENTS ONLY

4 (Not to be reproduced without the permission of BIS or used as an Indian Standard) Draft Indian Standard TEST SIEVES - SPECIFICATION PART 2 PERFORATED PLATE TEST SIEVES Fourth Revision of IS 460 (Part 2) ICS NO Sieves, Sieving and Other Sizing Methods Last date of Comments Sectional Committee, CED 55 28/02/2019 FORWORD (Formal clauses to be added later) This standard was first issued in 1953 and revised in 1962, 1978 and 1985, the 1978 revision of this standard was published in three parts, namely, Part 1 Wire cloth test sieves, Part 2 Perforated plate test sieves, and Part 3 Methods of examination of test sieves The 1985 revision of this standard (Part 2), was taken up in view of the experience gained during the course of implementation of this standard and also to make it technically equivalent with the following International Standards published by the International Organization for Standardization (IS0). IS Test sieves--metal wire cloth, perforated plate and electroformed sheet-nominal sizes of openings. IS : 2013 Test sieves-technical requirements and testing- Part 2: perforated metal plate. Test sieves of In the 1985 revision, the number of aperture sizes were considerably increased. While the principal sieve sizes as per ISO 565 were adopted in the Standard, due to practical consideration. The prevailing Indian sizes was also permitted temporarily which were proposed to be withdrawn in the next revision of the Standard. This was to facilitate switch-over to ISO sieve sizes in a smooth manner. In this revision, the committee include the aperture size as specified in ISO : 2016 including the aperture sizes to R 20/3 series (principal size) R20 and R40/3 series (supplementary size) as per ISO : This was in accordance with the decision taken during the last revision of the standard and also necessitated on the basis of the comments and request received from the various stakeholders in view of the free export and global trade practices. It is intended to bring this standard at par with the IS and ISO :2016 to the extent possible. Further, in this revision the material requirements for the sieve media and frame is improved to permit various new materials available for the product in the market. However choice for the selection of the material is left to the user. The aperture sizes specified in Table 2 Aperture tolerances and aperture pitch of IS 460 (Part 2):1985 are also kept in this revision as Annex A which will be subsequently withdrawn once the stakeholders get used to this revised version. This standard specified that purchaser should supply certain information including material with enquiry and order for procurement of test sieves to suit the requirements. For the purpose of deciding whether a particular requirement of this standard is complied with, the final value, observed or calculated, expressing the result of a test or analysis, shall be rounded off in accordance with IS 2 : 1960 Rules for rounding off numerical values ( revised). The number of significant places retained in the rounded off value should be the same as that of the specified value in this standard.

5 TEST SIEVES - SPECIFICATION PART 2 PERFORATED PLATE TEST SIEVES Fourth Revision of IS 460 (Part 2) Sieves, Sieving and Other Sizing Methods Last date of Comments Sectional Committee, CED 55 28/02/ SCOPE 1.1 This standard (Part 2) covers test sieves, with sieving medium of perforated plate having either round or square apertures, for use in testing in the classification of materials according to particle size. 1.2 It applies to test sieves having: a) round holes from 125 mm down to 1 mm aperture size; b) square holes from 125 mm down to 4 mm aperture size; and c) round holes from 200 mm down to 140 mm aperture size ( non- IS0 sizes ). 2 REFERENCE The following standards contain provisions, which through reference in this text, constitute provisions of this standard. At the time of publication, the edition indicated was valid. All standards are subject to revision and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent edition of the standard indicated below: IS No. Title 460 (Part 3) : xxxx* Test sieves Specification : Part 3 : method of examination of apertures of test sieves ( fourth revision* ) 5421 : 2013 Glossary of terms relating to test sieves and test sieving 3 DESIGNATION 3.1 Test sieves are designated by the nominal size of aperture, expressed in millimetres followed by the inscription IS Sieve ( C ) or IS Sieve ( R ) where C stands for square holes and R stands for round holes. Examples: a) 90-mm IS Sieve ( C ) b) 5.6 mm IS Sieve ( R ) 4 SIEVING MEDIUM 4.1 Materials for Sieving Media The sieving media may be manufactured from any suitable material such as bronze, brass, stainless steel, synthetic materials etc. Plated or coated wires shall not be permitted in the test sieves. The purchaser should state specific requirements in the enquiry. However, the material selected shall not be prone to corrosion and should not be determinate to desirer sieving quality. 4.2 Aperture Tolerances The nominal aperture w ( see Fig. 1 and 2 ) and tolerance as given in co1 1, 2,3 and col 4 of Table 1 applies to each mid-section of square hole or diameter of round hole The tolerance applies to any one measurement of any aperture In addition, the following non-is0 sizes ( round holes only ) with tolerances as indicated are permitted: * Indian Standard under revision

6 Nominal Aperture Tolerance on Size Individual Aperture Size mm mm 200 ± ± ± ± The test sieves having non-is0 aperture sizes ( see ) shall be made as single ring gauges. 4.3 Pitch The nominal pitches P ( see Fig. 1 and 2 ) given in Table 1apply to either round or square holes. Table 1- Tolerances on individual size of holes and selection of pitche (All values in millimetres) Nominal Sizes of holes, w a Tolerances on Pitch p Principal sizes Supplementary sizes individual size of hole Preferred sizes Permissible range of choice R 20/3 R 20 R 40/3 ± P nom P max P min (1) (2) (3) (4) (5) (6) (7)

7 Nominal Sizes of holes, w a Principal sizes Supplementary sizes Table 1 (Continued) (All values in millimetres) Tolerances on individual size of hole ± Preferred sizes Pitch p Permissible range of choice R 20/3 R 20 R 40/3 P nom P max P min (1) (2) (3) (4) (5) (6) (7) NOTE 1) It is recommended that the principal sizes be used where possible, but if a series having smaller steps is required it should be drawn from only one of the supplementary series and not from both, i.e. from either R 20 or R 40/ The nominal pitches given in Col 5 of Table 1 are preferred. The nominal pitch as specified may, however, depart, from these values within the limits of Pmax and Pmin ( co1 6 and 7 of Table 1 ). 4.4 Plate Thickness The thickness of plate at landing section of aperture (see figure 3) shall conform to Table2. NOTE Additional thickness in clearing section (see Figure 3) with clearing angle of approximate 7 may be provided to avoid tunneling effect.

8 Table 2-- Nominal Plate Thickness of landing thickness (All values in millimetres) Nominal sizes of holes Plate thickness of landing section W Preferred Permissible Range of Choice Thickness max Min (1) (2) (3) (4) 125 to to to to to The test sieves having non-is0 aperture sizes ( see section ) shall have minimum plate thickness of 4 mm. 4.5 Arrangement of Holes The arrangement of holes in perforated plates in test sieves shall be as follows: a) Round holes with their centres at the apices of equilateral triangles ( see Fig. 1 ) b) Square holes in line, with their mid-points at the vertices of squares ( see Fig. 2) The corners of the square holes may be rounded. The maximum value of r, the corner radius of any square hole, is given in millimetres by the formula: r max = 0.05 w where, w is the nominal size of aperture in millimetres. Key w is the aperture size p is the pitch r is the corner radius Fig. 1 ARRANGEMENT OF ROUND HOLES

9 Fig. 2 ARRANGEMENT OF SQUARE HOLES Fig. 3 SECTIONAL DETAIL OF APERTURE 4.6 Workmanship The perforated plates used in the manufacture of test sieves shall have uniform and clean holes. It is preferable to make the holes in the plates in such a way as to avoid part apertures showing after mounting. 4.7 The Minimum effective sieving area of sieve shall be 65 percentage. Part apertures shall not be consider in calculation of Minimum effective sieving area. 5 TEST SIEVE FRAME 5.1 Material The sieve frame may be manufactured from any suitable material such as bronze, brass, stainless steel, synthetic materials etc. The purchaser should state specific requirements in the enquiry. 5.2 Shape and Size

10 The shapes and sizes shall be as given in Table 3 ( see Fig, 2 ). Key words A -TOP INTERNAL DIAMETER / LENGTH B- BOTTOM INTERNAL DIAMETER / LENGTH T- MINIMUM THICKNESS E - DIAMETER OR LENGTH OF EFFECTIVE SIEVING SURFACE C- DEPTH FROM TOP EDGE TO SIEVING SURFACE D- DEPTH FROM BOTTOM EDGE TO SIEVING SURFACE FIG. 2 TYPICAL DESIGN AND DIMENSIONS OF FRAME FOR TEST SIEVE 5.3 It is recommended that the 200 mm round frames should be used as far as possible. For large aperture size the 300 mm round or square sieve may be required, or even larger sieves of 450 mm size for aperture sizes greater than 25 mm and large sample quantities. NOTE - The shape and size of the sieves have little effect on the results of sieving operation. 5.4 Cover and Receiver When specified by the purchaser a cover and receiver shall be provided for sieves, of the same material and thickness as the sieve frame ( see Fig. 3 ). The cover of the sieve shall be suitable to ensure snug tight. The depth of the receiver shall be equal to the dimension ( C ) specified in Table 3 SL No SHAPE TABLE 3 SHAPES AND SIZES OF TEST SIEVE FRAMES (Clauses 5.2 and 5.4) All dimensions in millimetres NOMINAL SIZE TOP INTERNAL DIAMETER / LENGTH BOTTOM INTERNAL DIAMETER /LENGT*H MINIMUM THICKNESS DIAMETER /LENGTH OF EFFECTIVE SIEVING SURFACE DEPTH FROM TOP EDGE TO SIEVING SURFACE DEPTH FROM BOTTOM EDGE TO SIEVING SURFACE A* B T E C D Min Max (1) (2) (3) (4) (5) (6) (7) (8) (9) (10) i) Round ii) Round or Square -0-1 iii) Round or Square -0-1 Min NOTE - Where so desired, sieves having 25 mm depth from top edge to the sieving surface may also be supplied. *A and B shall be such as to make the sieves nestable as specified in

11 FIG. 3 NEST OF TEST SIEVES WITH COVER AND RECEIVER 6 FINISH 6.1 The sieving surface, frame receivers, and covers, shall be smoothly finished. Seal between frame and sieving medium shall be so formed as to prevent lodging of the material to be sieved. There shall be no lacquer on surfaces which come into contact with sample. 7 NESTING 7.1 The test sieves shall nest snugly with each other and with the lid and receiver of the same shape and size. 7.2 Sieves complete with a lid and receiver in a set, shall be assembled so that escape of sample material during a test sieving operation is prevented. 8 MOUNTING 8.1 The sieving media shall be so mounted in the frame as to be held firmly and equally taut in all directions without any distortion. 9 TESTING 9.1 Each of the test sieves shall be tested to meet the requirements of this standard. The apertures of the test sieves shall be examined in accordance with IS : 460 ( Part 3. NOTE If calibration test is required by the purchaser, it shall be clearly stated in the enquiry and order. 10 INFORMATION TO BE SUPPLIED BY THE PURCHASER 10.1 The purchaser should state the following with any enquiry and order: a) Designation of the sieve; b) Sieving medium: Material; c) Frame shape, size and material; d) Whether a receiver is required; e) Whether a cover is required; f) Whether calibration is required; and g) Whether statement on thickness of plate is required.

12 11 MARKING 11.1 Each sieve complying with this standard shall be legibly and durably marked with the following information. a) The manufacturers name or trade-mark; b) Designation of sieve; c) The material of the sieving media; d) The material of the sieve frame; e) An identification number/ batch number; and f) The thickness of the plate, if required by the purchaser BIS Certification Marking Each test seive may also be marked with the Standard Mark The use of the Standard Mark is governed by the provisions of the Bureau of Indian Standards Act, 2016 and the Rules and Regulations made thereunder. The details of conditions under which a licence for the use of Standard Mark may be granted to manufacturer and producers may be obtained from the Bureau of Indian Standards.

13 NOMINAL APERTURE SIZE, w ANNEX 1 Test sieve covered under IS:460 (Part 2)-1985 (third Revision) TABLE 3 APERTURE TOLERANCES AND APERTURE PITCHES (All dimensions in millimetres) TOLERANCE ON INDIVIDUAL APERTURE PREFERRED NOMINAL PITCH NOMINAL PITCH APERTURE PERMISSIBLE RANGE OF CHOICE Mm ± P P max P min (1) (2) (3) (4) (5) (a) For Round and Square Holes

14 NOMINAL APERTURE SIZE, w TOLERANCE ON INDIVIDUAL APERTURE TABLE 3 (Continued) PREFERRED NOMINAL PITCH NOMINAL PITCH APERTURE PERMISSIBLE RANGE OF CHOICE Mm ± P Pmax pmin (1) (2) (3) (4) (5) (b) For Round Hole Only