Is I 781 - 1984 Indian Standard (Reaffi&acdl990) ( Reaffirmed 2005 ) SPECIFICATION FOR CAST COPPER ALLOY SCREW DOWN BIB TAPS AND STOP VALVES FOR WATER SERVICES . . ( Third Revision) Second Reprint OCTOBER 1991 UDC621.646.5/.6:[669.35.018.28]:696.117 @ Copyright 1985 STANDARDS BUREAU OF INDIAN MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARC NEW DELHI 110002 GrS March 1985 I@ I 781 - 1984 Indian Standard . SPECIFICATION FOR CAST COPPER ALLOY SCREW DOWN BIB TAPS AND STOP VALVES FOR WATER SERVICES ( Third Revision ) Sanitary Appliances and Water Fittings Sectional Committee, BDC 3 Chairman K. D. MULEX~ Members PHE ) &lT6J6tlting Saar Municipal Corporation Bombay of Greater Bombay, ADVISER ( DEPUTY ADVISING ( PHE ) ( Altsrnute) National Test Howe, Calcutta SH~I S. K. BANERJEE SERI D. K. KANUN~O( Alternate ) Central Glaaa ik Ceramic Research Institute SHBI M. K. BASU ( CSIE;a,C$cutta Public Engineering Department, CH~EBENQIN~~ Government of Kerala, Trivandrum SERI K. RAMACHAND~AN ( Altemutr ) U. P. Jal Nigam, Lucknow CHIEF ENQINEE~ STJPERINTEND~~Q EN~I~P~~EB ( Altmatr ) Municipal Corporation of Delhi, Delhi SHBIJ. D `CRUZ SHRI s. A. SWAMY ( ~krMt6 ) Bombay Potter% & Tiles Ltd, Bombay DIRECTOR Engineer-in-Chief% Branch, Army Headquarters, SHRI B. R. N. GUPTA New Delhi &RI K. v. ) Central Public Health & Environmend Engineering Organization ( Ministry of Works & Homing ), New Delhi &%IEFfNAMURTFfY EID-Parry (.India ) Ltd, Madras SHBI P. JAOANATH RAO SHRI M. MOOSASOLAIYAN(A&r&6_) ; Mun~~xyCorporation of Greater SHSI A. F. KHAN DEPUTY HYDBAULIO ENO~WEEB ( Alt6rnat6 ) ( Ahrnut6 Bombay, (Cdmw2) BUREAU OF INDIAN STANDARDS This publication is protected under the fad&m &#ri& Act ( XIV of 1957 ) and reproduction in whole or in part by any mean6 except with written perminion of the publther shall be deemed to be an infringebent of copyright unda the 6aid Act. * IS:781-1984 ( Contimmdfrom~ge Mmmbars SEBI S. R. KSHI~~A~AB Srrxxr R. C. REDDY ( Alkmutu ) SH~I K. LAK~EIKXXA~AYANAN SEEI A. SaaarYr ( Altcrnota ) DR A. V. R. RAO SHBI J. SEN~UPTA ( Ahrnut6 ) S~~xoa CIVIL ENo1~Ert4t ( WATIEB SUPPLY ) SEBI S. K. SEAILMA SEEI R. K. SOMANY SU~VIEYOE oY Wo~rra ( NDZ ) SUBVEYOE OP WOltKS I ( NDZ ) SRBI d .A;:%N 1) National Environmental Engineering Institute ( CSIR ), Nagpur Hindustan Shipyard Ltd, Vishakhapatnam of Research National Buildings Organization ( Ministry Works and Housing ), New Delhi Railway Board, New Delhi Central Building Research Institute ( CSIR ), Roorkee Hiuduatan Sanitaryware & Industries Ltd, Bahadurgarh Central Public Work6 Department, New Delhi Directorate General of Technical Development, New Delhi ) Directorate General of Supplies & Disposals, New Delhi Director General, IS1 ( Ex-o@io M6mb6r) h.Y6ttlu Sam Id. hf. ALIKEAN ( SHBI T. N. UBO~EJA Ssrur G. RAYAN, Director ( Civ Engg ) &6mat6 SHBI C. K. BEBABTA Senior Deputy Director ( Civ Engg ), IS1 Domestic and Municipal Water Fittings Subcommittee, BDC 3 : 2 HYDBAULIO EROINEI~B Municipal Bombay Corporation of Gnater Bombay, Dqr&r HYDBAULIO ENQINEEB ( Altrmotr ) Goverdhan S-I` Ymaar RAJ AOOABWAL ~z~~)~ RAJ AU~ABWAL CE~EP ENS& CFIrEY BNorXEEl4 CHIlw l%uNEaB ~&~lo%tter Das P. A., Calcutta Supply Sewerage Board, CHIEY &OIl'rImIt S,rJPlCBIIPTIDNDINQ BNOIlpElBa ( A~tarnat6 ) MtiNctra Drarsoro~ R~~EAI~OH OYYIOEB ( &6rMt6 ) SEBI . D.`Csnz SJ EBI S. A. SWAMY (Ahnat ) Tamil Nadu Water Supply & Drainage Board, MiKhiU Engiueeriug Department, Public Health Government of Kerala, Trivaudrum U. P. Jai Nigam, Lucknow Engineering Corporation Rerearch Delhi Institute, Municipal of Delhi, (continurdOfI~67619) 2 IS I 781.1984 Indian Standard SPECIFICATION FOR CAST COPPER ALLOY SCREW DOWN BIB TAPS AND STOP VALVES FOR WATER SERVICES ( Third Revision ) 0. FOREWORD 0.1 This Indian Standard ( Third Revision ) was adopted by the Indian Standards Institution on 28 Septmber 1984, after the draft finalized by the Sanitary Appliances and Water Fittings Sectional Committee had been approved by the Civil Engineering Division Council. 0.2 This standard was first issued in 1959 and subsequently revised in 1967 and 1977. The third revision of this standard has been `taken up to incorporate changes in the light of comments received from users and manufacturers. The scope of the standard has been enlarged to permit bib taps have internal and external ends. Similarly, stop valves shall have either or both ends, namely male or female or mixed ends. 0.3 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 The number of significant places retained accordance with IS : 2-1960*. in the rounded ofI value should be the same as that of the specified value in this standard. 1. SCOPE 1.1 This standard covers requirements of copper alloy screw down bib taps and stop valves suitable for cold non-shock working pressure up to 1-O MPa. Bib taps shall have screwed male inlet. Stop valves shall have screwed female ends or male ends or mixed ends ( mixed ends means one end screwed male and the other end screwed female ). NOTFJ *Rules Cold service meana a temperature not exceeding 45°C. for rounding off numerical values ( raised ). 3 ISr781- 1984 2. TERMINOLOGY 2.0 For the purpose of this standard, the following definitions shall apply. 2.1 Bib Tap A draw-off tap with horizontal inlet and free outlet. 2.2 Stop Valve - A valve with suitable means of connection for insertion in a pipe line for controlling or stopping flow. 2.3 Screw-Down Bib Tap or Stop Valve - A bib tap or a stop valve closed by means of disc carrying a renewable non-metallic washer which shuts against the water pressure on a seating at right angles to the axis of the threaded spindle which operates it. 3. NOMINAL SIZES 3.1 The nominal sizes of bib taps shall be 8, 10, 15,20 and 25 mm. 3.2 The nominal sizes of stop valves shall be 8, 10, 15, 20, 25, 32, 40 and 50 mm. 3.3 Nominal sizes of the bib tap and stop valves shall be designated by the nominal bore of the socket or pipe outlet to which the tap or valve is normally fitted. 4. MATERIAL 4.1 The material used for the manufacture of different components of bib taps and stop valves shall conform to the requirements given in Table 1. 5. DIMEhSIONS AND TOLERANCES shall be with a 5.1 Dimensions of bib taps and stop valves and their components in accordance with Table 2. 5.2 The overall length tolerance of A3 mm. Nominal Size of stop valves shall be as given Ovsrnll Length, mm - ------_-7 y;rn$;$ 65 75 85 100 125 135 145 175 4 below --Internally Threaded 45 50 60 70 85 100 110 135 Mixed Ends 55 62 70 85 105 115 125 155' 8 10 15 20 25 32 40 50 &S: 7811 1984 TABLE 1 MATERIALS FOR COMPONENTS AND STOP VALVES ( chzusc 4.1 ) OF BIB TAPS SL No. (1) i) COXPONENT (2) Body and bonnet MATERIAL (3) a) Cast brass b) Leaded in bronze tin CO~FOR~NQ TO INDIAN STANDARD (4) Grade 3 of IS : 292-1961, Grade DCB 2 of IS : 1264-1981t Grade LTB 2 of IS : 318-19812 Type I half hard of IS : 319-19748 Grade CuZn 42 pb 2 of IS : 3488198011 Grade HT 1 of IS : 320-19807 Grade FHTB 1 of IS : 6912-5' Type I half hard of IS : 319-197% Grade DCB 2 of IS : 1264-1981t Grade CuZn 42 pb 2 of IS : 3488198011 Grade 3 of IS : 292-1961* Grade HT 1 ofIS : 320-19807 Grade LTB 2 of IS : 318-1981$ ii) Spindle, nuts Brass rolled ( extruded, or forged ) iii) Gland, crutch ( handle ) washer ,plate, etc Brass rolled, cast ) ( extruded, cast, die Leaded tin, bronze iv) Washer As specified in IS : 4346-1982tt *Specification for brass ingots and casting (first revision ). tSpecilication for brass'ingots die castings, brass gravity die castings ( including nova1 brass ) ( second revision ). fSpecification for leaded tin bronze ingots and castings < second renision ). &Specification for free-cutting brass bars, rods and sections ( third recision ). 1lSpecification for brass bars, rods and sections suitable for forging ( jirst revision ). BSpecification for high tensile brass rods and sections ( other than forging stock ) ( second revision ) . **Specification for copper and copper alloys forgings ( under preparation ). ttSpecification for washers for water taps for cold water services. 6. CONSTRUCTION 6.1 All castings and both external -..i : 2.4. AND WORKMANSHIP and free surfaces from laps, blow shall be clean, holes and pitting, smooth and free shall be sound and internal from sand. 6.2 The bodies, bonnets, spindle and other that when assembled, the parts shall be axial, surfaces smoothly finished within the limits various components. Bonnet may be located of locking screw if desired by the purchaser. parts shall be machined so parallel and cylindrical with of dimensions specified for with the body with the help IS: 781- 1984 6.3 The wall thickness at any point of the body shall not be less than the thickness D specified in Table 2. However, the minimum value of D may, in the case of open end outlet of bib taps, be reduced by 0.40 mm. Bib taps and stop-valves shall be designed and manufactured to tolerances set to allow for interchangeability between units of same size of the same manufacturer. 6.4 The seating of a bib tap or stop valve shall be solid with the body The edges shall be rounded and shall have a smooth machined surface. off to avoid cutting edges. 6;s Bib taps shall be constructed as to ensure that the stream of water shall not unduly break or spread. 6.6 Screw Threads . 6.6.1 The inlet and outlet connection threads shall have internal or external threads conforming to IS : 554-1975*. External parallel thread shall conform to IS : 2643 ( Parts 1 to 3 )-1975f. 6i6.2 Bonnet threads shall be adequate to withstand minimum cold working pressure. Minimum pitch of threads shall be 1.5 mm. The internal thread in the bonnet for spindle shall be so formed that when the spindle is screwed into the bonnet to its fully open position the ends of the spindle projects beyond the face of the bonnet ,by at least 0.7 mm in the taps or valveiup to 25 mm size, and by at least 1.5 mm in large sizes. 6.6.3 The threads on spindles shall be of square, ACME or V-form. The length of spindle thread shall be such that when the washer plate is rest.ing on the seating without any washer, a length of the thread equal to not less than three-fourths of the external diameter of the threaded portion of the spindle shall be in fuIl engagement with the internal thread of the bonnet. 6.7 Body and Bonnet 6.7.1 The minimum bore of ends not threaded dimension c K ' given in Table 2. 6.8 Washer Plate and Washer 6.8.1 The washer plate with its stem shall be either made in one piece from cast brass or in two pieces from extruded or forged brass rods and shall be machined all over. -*Specification for dimensions for pipe threads where pressure tight joints are tSpecification for dimensionsfor pipe threads for fastening purposes: Part I Basic profile and dimensions (Jirst revision ). Part 2 Tolerances (Jirst revision ). Part 3 Limits of sizes ( pfst nvision ). shall be according to required on the threads ( second wvision ). 6 TABLE 2 DIMENSIONS AND TOLERANCES OF BIB TAps AND ST(JP VALVES AND THEIR COMPON~TS ( cIausf35.1 ) ?'7 HANOLE 0 FA - i-----' ---l I BIB TAP .eL. -J INTERNALLY STOP THREADED VALVE EXTERNALLY THREADED STOP VALVE All dimensions in mi]iimetres. )IMNN8101W + NOMINAL %ZE8 + 8 I 1A B- # (7 Min -- 7~8 -- 9"4 _ 9"4 _ 10.9 -- 12.5 -- 14'1 -- 15"7 -- 17"3 35"9 14"0 2"5 17"4 17"5 33"3 127 2"5 159 17"5 309 11"4 2"5 14"3 16"0 23'0 lml 2"5 12.7 13"0 201 8"9 2"5 11"1 12"5 190 7"5 2"0 9"5 11"0 18°7 7"5 2"0 165 6-3 2"0 B Min E Min F Min G Min H Min Min -- 38 -- 95 9"5 #7 -- 5"6 _ M 24 11"5 19'0 :5 -- M 30 15.7 -- e4 -- 7"1 -- ?8 -- 8"6 -- 12"5 . M 72 260 :5 63"5 13.5 ?5 -- M 39 17"0 ?5 . 20"5 -- M46 19"0 ;5 -- M 56 20"5 :5 -- -- 6"3 -- 46 . 8"3 . 25"1 . 1Y9 -- 40 7&l 71"5 16"5 -L 47'7 5"5 4'0"1 43 30 -- 36 5"9 -- 66 . 21"4 21"4 12"7 -- 14'3 -- 3"2 56-4 585 3"2 4?2 52'1 13"5 _-- 1Y5 . -- . . 33"3 . 4"0 -- -- -- 19"1 25'4 *O 18.0 *9 l&3 103 _ 11"0 -- 2.8 37"6 42"4 2"0 30'5 33"0 10.5 . _ -- Min . M 20 7"9 100 :5 -- M 20 11"5 :5 -- . 3"2 -- 13"0 . 4"1 . 15"0 _ -- 9"5 15'9 3"2 -- 9.0 -- 3-2 11"4 -- 7"9 _ 2"0 -- 25"6 28'3 9 1P3 2-8 6"5 2"4 11"0 47 . 2"0 20"8 23"3 7 I 1"6 1.Y2 19"5 L Min M N + Min . Min I Min . Min - 0"5 :"Q -- Q R Min . s &fin T Min u Min v Min --. W Min Min _ -- LIST or WASNNR PLATE ( WITH WASEEB IN POSITION, Min ) 47.8 13"3 -- -- 10 540 I --1 7 I I 3"5 140 4 15 54"0 14"0 -- *5 -- 6 l-- 20 60.4 . -- `i 11"5 25 66'8 18"0 23"0 I 4"9 7 -- 9"5 ­l-- 43 82'5 . 22"0 11 50 95"0 25"3 14"5 NOTE 1 -- Length of thread R includes cut back under hexagon, NOTE 2 -- The values of K are for core diameter. No~ 3 -- The diameter of U and V are for face to face. NOTE 4 -- The dimension F is packing face. if any, 7 As in the Original Standard, this Page is Intentionally Left Blank ISr781-1984 6.8.2 The washer plate with its stem in tap or valve shall be free to rotate and slide in the hole of spindle. 6.8.3 Washer plate shall have a stud for attaching stud shall be threaded and provided with a nut. the washer. The 6.9 There shall be sufficient distance between the underside of the handle and the top of the bonnet when the tap or valve is closed, so as to provide enough clearance for repacking the gland without removing the handle of the bib tap or stop valve. 6.10 The handle shall be close fit on the spindle and it shall be fixed by a The handle shall not be screw, riveting or other equally effective device. screwed on to the spindle. 6.11 Gland Packing - The stuffing box of bib tap or stop valve shall be packed with a suitable asbestos gland packing conforming to IS : 46871980* or hemp/jute conforming to IS : 54 141969t or other equally efficient packing material suitable for both cold and hot water. A suitable washer may also be fitted in the bottom of the gland or stuffing box. 6.12 A hexagonal shoulder shall be provided on the inlet end of taps and both ends of stop valves. Square or hexagonal shoulders shall also be The dimensions across flats for both hexagonal provided on all bonnets. and square shoulder shall comply with as given in Table 2. 7. MINIMUM MASS 7.1 The minimum finished mass of the bib taps and stop-valves shall be as given in Table 3. 8. FINISH 8.1 The bib taps shall be always polished bright. 6.2 The stop valves may be polished unpolished as ` cast ' finish, bright or they may have an 6.3 The bib taps or stop valves may also be nickel-chromium plated, the thickness of plating shall not be less than service grade No. 2 of IS : 48271X8$. The plating shall be capable of taking high polish and shall not easily tarnish or scale. *Specification for gland packing asbestos(Jilsf revision ). iSpecificatiofi for gland packingjute and hemp. tspecification for electroplated coatings of nickel and chromium on copper and copper alloys. 9 IS: 781 - 1984 TABLE 3 MINIMUM FINISHED MASS OF BIB TAPS ( CIausc 7.1 ) SIZE AND STOP VALVES ~--__-_-~----~Bib Taps MINIMUM FINISHED c-__---_--_*--------~ Internally threaded (3) kg 0.220 0'300 0'330 0.675 1.1f30 1'680 2'090 3'700 MAW h--------_---~ Stop Valves Externally threaded (4) kg 0'250 0.350 0'400 0'750 1'300 1.800 2.250 3'850 Mixed end (5) kg 0'235 0'325 0.365 0'710 I.250 1'750 2.170 3.750 (1) mm 8 i0 (2) kg 0'250 0.300 0'400 0'750 I.250 - 15 20 25 32 40 50 9. TESTING bib tap or stop valve complete with its components shall be tested under an internal hydraulic pressure of 2 MPa minimum maintained at that pressure for a period of at least 2 minutes during which it shall neither leak nor sweat. 10. SAMPLING 9.1 Every 10.1 The scale of sampling Appendix A. and criteria for conformity shall be as given in 11. MARKING 11.1 Every bib tap or stop valve shall be legibly maiked with the manufacturer's name or trade-mark and nominal size on the body. 11.2 A direction arrow pointing in the stamped on the body of all stop valves. 11.3 The bib taps Certification Mark. the Indian Standards direction of flow shall be cast or with the IS1 and stop valves may also be marked NOTE - The use of the IS1 Certification Institution Regulations made thereunder. The IS1 Mark on products covered by an Indian Standard conveys the assurance that they have been produced to comply with the requirements of that standard under a well-defined system of inspection, testing and quality control which is devised arid supervised by IS1 and operated by the producer. IS1 marked products are also continuously checked by IS1 for conformity to that standard as a further safeguard. Details of conditions, under which a licence Mark is governed by the provisions of ( Certification Marks) Act and the Rules and for the use of the IS1 Certification Mark may be granted to manufacturers Or processors, may be obtained from the Indian Standards Institution. Is : 781 - 1984 APPENDIX A ( Clause 10.1 ) SAMPLING AND CRITERIA FOR CONFORJWTY FOR ACCEPTANCE A-l. SCALE OF SAMPLING A-1.1 Lot - In any consignment, all the items ( bib taps or stop valves ) made of the same material, of the same nominal size and belonging to the same batch of manufacture shall be grouped together to constitute a lot. A-l.2 For ascertaining conformity of the material to the requirements this specification, samples shah be tested from each lot separately. of A-1.3 The number of items to be selected from a lot shall depend upon the size of the lot and shall be in accordance with co1 1 and 2 of Table 4. TABLE 4 SCALE OF SAMPLING AND CRITERIA FOR CONFORMITY SAMPLE SIZE ACCJICPTANLNCE NUMBEROBITEYS INTHELOT NUMBEB (3) 0 0 1 2 3 5 SuB-x?Z I (1) up to 150 151 to 300 301 9,500 501 ,t 1 000 1001 s, 3000 3 001 and above (2) 8 13 20 32 50 80 (4) 3 5 8 13 20 32 A-1.3.1 The items from the lot shall be selected at random. In order to ensure the randomness of selection, procedures given in IS : 49051968*, may be followed. A-2. NUMBER OF TESTS AND CRITERIA FOR CONFORMITY A-2.1 AI1 the items selected according to co1 1 and 2 of Table 4 shall be examined for material, workmanship, construction, finish, dmensions and minimum mass. An item failing in one or more of these requirements shall be considered as defective. A-2.1.1 The lot shall be considered as conforming to these requirements if the number of defective items found in the sample is less than or equal to corresponding acceptance number given in co1 3 of Table 4. *Methods for random sampling. Is:781-1984 A-2.2 The lot having satisfied the requirements given in A-2.1 shall be further tested for hydraulic pressure test as given in 9.1 ofthe specification. A-2.2.1 For this purpose, the number of items given in co1 4 of Table 4 shall be selected from the lot. These may be' selected from those which have been examined for other requirements according to A-2.1 and found satisfactory. A-2.2.2 The lot shall be considered to have satisfied the requirement for hydraulic test if none of the items in the sub-sample fails in hydraulic test according to 9.1. 12 ( Continurdfiom pap 2 ) Mmbm SEBI B. R. N. GUPTA Rapresenting Engineer-in-Chief `a Branch, Army Headquarters, New Delhi Sam IL V. K~I~ENAYURTHY ( Alfsrnafe ) & Manufacturing Co Ltd, Hind Trading SH~I M. K. JAIN New Delhi SH~I K. K. JAIN ( Altcrnofr ) National Eaviornmental Engineering Rerearch SHBI S. R. K~HI~~AQAR Institute ( CSIR ), Nagpur SHRI A. W. DE~EFANDE ( Affwtofe ) Bomba Metal and Alloy Ma&facturing Co Pvt SEBI G. A. Ln~aa Lt B , Bombay Leader Engineering Works, Jalandhar SERI D. K. SBlIioAL Sear B. B. SIKK~ ( Altcrnatr ) Sant Brass Metal Works, Jalandhar SH~I R. P. SIEKA SEBI K. SUNIL KUYAB ( Alfsrnotr ) Hindustan Sanitaryware & Industries Ltd, SH~I R. K. SOXANY Bahadurgarh Ministry of Railways S-1 R. K. TANDON Dire;to;;e,eneral of Supplies & Disposals, Sgar T. N. UBOVEJA e 13 BUREAU Headquarters: OF INDIAN STANDARDS Manak Bhavan, 9 Bahadur Shah Zafat Marg, NEW DELHI 110002 Telephones: 331 01 31, 331 13 76 Telegrams: Manaksanstha ( Common to all Offices) Telephone 331 01 31 I 331 13 75 36 24 99 Regional Offices: Central : Manak Bhavan, 9 Bahadur Shah Zafar Marg, NEW DELHI 110002 *Eastern : l/l 4 C. I. T. Scheme VII M, V. I. P. Road, Maniktoia. CALCUTTA 700054 Northern : SC0 445-446, Sector 35-C, CHANDIGARH 160036 21843 I 3 16 41 41 24 42 Southern : C. I. T. Campus, MADgAS 600113 I 41 25 19 (41 29 16 TWestern : Manakalaya, E9 MIDC, Marol, Andheri ( East3, 6 32 92 95 BOMBAY 400093 Branch Offices: `Pushpak', Nurmohamed Shaikh Marg, Khanpur. 2 63 48 AHMADABAD 380001 I 2 63 49 SPeenya Industrial Prea 1st Stage, Bangalore Tumkur Road 38 49 55 BANGALORE 560058 38 49 56 I Gangotri Complex, 5th Floor, Bhadbhada Road, T. T. Nagar, 667 16 BHOPAL 462003 Plot No. 82/83, Lewis Road. BHUBANESHWAR 751002 5 36 27 531'5. Ward No. 29, R.G. Barua Road, 5th Byelane, 3 31 77 GUWAHATI 781003 5-8-56C L. N. Gupta Marg ( Nampally Station Road ), 23 1083 HYDERABAD 500001 R14 Yudhister Marg. C Scheme, JAIPUR 302005 117/418 B Ssrvodaya Nagar, KANPUR 208005 { z 21 ( 21 6 16 16 39: 68 82 23 21 21 73: 76 92 05 04 17 Patliputra Industrial Estate, PATNA 800013 T.C. No. 14/l 421. Urliversity P.O.. Palayam TRIVANDRUM 6'15035 Inspection Offices ( With Sale Point ): Pushpanjali, First Floor, 205-A West High Court Road, Shankar Nagar Square, NAGPUR 440010 Institution of Engineers ( India ) Building,.1 332 Shivaji Nag&, PUNE 411005 2 51 71 5 24 35 *Sales Office in Calcutta is at 5 Chowringhee Approach, P. 0. Princep 27 88 00 Street. Calcutta 700072 tSales Office in Bombay is at Novelty Chambers, Grant Road, 89 65 28 Bombay 400007 $Sales Office in Bangalore is at unity Building, Narasimharaja Square, 22 36 71 Bangalore 560002 Reprography Unit, BIS, New Delhi, India ._ AMENDMENT NO. 1 TO OCTOBER 1988 IS : 781-1984 SPECIFICATION FOR CAST COPPER ALLOY SCREW DOWN BIB TAPS AND STOP VALVES FOR WATER SERVICES { Third Revision) ( Page 3, claw bronzefor 0.2, third scn&cnce ) - Delete. Substitute 6D'. [ Page 5, Table 1, S1 No.. (i), f (b) Leaded in tin bronze *. 6, claute 6.3, line 2 ) c co1 3 J - ` (b)..Leaded tk ( Pop Substitute `T'for ( Page 6, J~USS 6.6.3, line 4 ) - Substitute Substitute ` two-thirds `P'for `K'. 1' for 4 three- fourths `. ( Page 6, clause 6.7.1, line 2 ) ( Pogc 7, 7~611 2 ) the figure for bib tap. Delete the legend ` OVERALL LENGTH ' from ( Page 7, Table 2, &ncnsion ( Pagr 7, Table 2, ht-~ohtn ( Pagr 7. Table 2, ffofc 2 ) - L ) kading Delete ` Min `. ) Substitute ' LIrT 'for ' LINT '. Substitute ' K and Q ' for ` K *. ( Pap 7, Table 2. JVofc4 ) - a) Substitute ` rp== `for ` face `. notes after Note 4: H ic length is diameter of body thread. of stem of wvber plate. b) Add the following `NoTPSNo= 6 The dimension The dimension3 ' the &sequent ( Page 9, &IUW 7 and 7.1 ) clauses. ( Page 10, Table 3 ) ( Page 1.0, C&W 9.1, Delete. line 2 ) - Delete and renumber Substitute ` l-5 .MPa `for Substitute c 2 MPa `. ( Table 3 ' ( Page 11, clause A-1.3, line 2 and Table 4 ) for ( Table 4 `. (BOOS) Reprography Unit, BIS,~Ncw Delhi. India NO. 2 NOVEMBER 1994 TO IS 781: 1984 SPECIFICATION FOR CAST COPPER ALLOY SCREW DOWN BIB TAPS AND STOP VALVES FOR WATER SERVICES ( Third Revision) [ Page 10, clause 9.1 ( see also Amendment AMENDMENT No. I ) ] - Substitute the following for the existing: `Every bib tap and stop valve complete with its components shall be tested in closed position under an hydraulic pressure of 1.5 MPa (minimum) maintained at that pressure for a period of at least 2 minutes during which it shall neither leak nor sweat.' (CED3) Reprography Unit, BIS, New Delhi, India