© BIS 2002

B U R E A U O F I N D I A N S T A N D A R D SMANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002

IS : 937 - 1981(Reaffirmed 1997)

Edition 3.2(2001-01)

Price Group 2

Indian StandardSPECIFICATION FOR

WASHERS FOR WATER FITTINGS FORFIRE FIGHTING PURPOSES

( Second Revision )(Incorporating Amendment Nos. 1 & 2)

UDC 614.843 : 621.643.4.06 : 621.882.4 NT

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IS : 937 - 1981

© BIS 2002

BUREAU OF INDIAN STANDARDS

This publication is protected under the Indian Copyright Act (XIV of 1957) andreproduction in whole or in part by any means except with written permission of thepublisher shall be deemed to be an infringement of copyright under the said Act.

Indian StandardSPECIFICATION FOR

WASHERS FOR WATER FITTINGS FORFIRE FIGHTING PURPOSES

( Second Revision )

Composition of Fire Fighting Sectional Committee, BDC 22

Chairman Representing

SHRI G. B. MENON Ministry of Home Affairs

Members

SHRI MAHESH C. AGARWAL Brijbasi Udyog, MathuraSHRI P. S. BANERJEE ( Alternate )

ASSISTANT SECURITY OFFICER (FIRE), NORTHERN RAILWAY

Ministry of Railways

SHRI S. R. BANSAL Steel Authority of India Ltd (Bokaro Steel Plant), Bokaro

SHRI A. CHATTERJE Tariff Advisory Committee, BombaySHRI F. B. SANJANA ( Alternate )

SHRI K. K. DAS GUPTA West Bengal Fire Services, CalcuttaSHRI N. DEVASAHAYAM Home Department (Fire Services), Government of

Tamil Nadu, MadrasSHRI V. JAYAPERUMAL ( Alternate )

SHRI V. P. DEWAN Ministry of Defence (DGI)LT-COL V. R. BANAHATI ( Alternate )

SHRI R. R. DHOBLEY Bhabha Atomic Research Centre, Trombay, Bombay

DIRECTOR, FIRE SERVICES Home (Police) Department, Government of Andhra Pradesh, Hyderabad

DEPUTY DIRECTOR, FIRESERVICES ( Alternate )

SHRI G. N. GIDWANISHRI D. N. PANDIT ( Alternate )

Directorate General of Supplies & Disposals, New Delhi

SHRI P. N. GHOSHSHRI A. K. SURI ( Alternate )

Ministry of Defence (R & D)

SHRI GOPAL KRISHAN Central Building Research Institute (CSIR), Roorkee

( Continued on page 2 )

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IS : 937 - 1981

2

( Continued from page 1 )

Members Representing

SHRI J. S. JAMSHEDJISHRI H. K. ERANI ( Alternate )

Steelage Industries Limited (Minimax Division), Calcutta

JUNIOR MANAGER (FIRE) Heavy Engineering Corporation Ltd, RanchiSHRI S. N. KUNDU

SHRI S. PAUL ( Alternate )Fire and Safety Appliances Co, Calcutta

MANAGING DIRECTOR Avon Services (P & A) Pvt Ltd, BombayTECHNICAL EXECUTIVE ( Alternate )

SHRI L. S. D. MEHERVANJEESHRI V. B. NIKAM ( Alternate )

Municipal Corporation of Greater Bombay (Bombay Fire Brigade), Bombay

SHRI B. R. MEHTA The Institution of Fire Engineers India, New DelhiSHRI A. N. AHLUWALIA ( Alternate )

SHRI P. N. PANCHAL Central Industrial Security Force (Ministry of Home Affairs), New Delhi

SHRI P. C. RATHO Steel Authority of India (Rourkela Steel Plant), Rourkela

SHRI C. D. SHARMA ( Alternate )SHRI K. K. SAWHNEY

SHRI R. MEHTA ( Alternate )Air Foam Industries Pvt Ltd, New Delhi

SHRI P. L. SEBASTIN Oil & Natural Gas Commission, Dehra DunSHRI V. V. KIMMATKAR ( Alternate )

SHRI P. H. SETHNA Kooverji Devshi & Co Pvt Ltd, BombaySHRI N. T. PANJWANI ( Alternate )

SHRI D. K. SIRKAR Synthetics & Chemicals Limited, BareillySHRI J. V. SHAH

SHRI B. J. SHAH ( Alternate )Newage Industries, Surendranagar

SHRI CHANDRAKANT M. SHAHSHRI M. H. SHAH ( Alternate )

Zenith Fire Services, Bombay

SHRI S. S. L. SHARMA Municipal Corporation of Delhi (Delhi Fire Service), Delhi

SHRI TARIT SURSHRI S. SUR ( Alternate )

Sur Enamel & Stamping Works Pvt Ltd, Calcutta

SHRI SUSHIL KUMAR Directorate General of Technical Development, New Delhi

SHRI S. VENKASWAMY Directorate General of Civil Aviation, New DelhiSHRI B. V. WAGLE Urban Development and Public Health

Department, Government of Maharashtra, Bombay

SHRI V. H. MADKAIKAR ( Alternate )SHRI G. RAMAN,

Director (Civ Engg)Director General, ISI ( Ex-officio Member )

SecretarySHRI K. M. MATHUR

Deputy Director (Civ Engg), ISI

( Continued on page 7 )

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IS : 937 - 1981

3

Indian StandardSPECIFICATION FOR

WASHERS FOR WATER FITTINGS FORFIRE FIGHTING PURPOSES

( Second Revision )0. F O R E W O R D

0.1 This Indian Standard (Second Revision) was adopted by theIndian Standards Institution on 30 July 1981, after the draft finalizedby the Fire Fighting Sectional Committee had been approved by theCivil Engineering Division Council.0.2 This standard was first issued in 1950 and revised in 1965. In thisrevision, requirements for the water fittings have been incorporatedfor which Indian Standards are available till 1980. The revision alsoincludes the details of specification of the rubber used for themanufacture of washers.0.3 This edition 3.2 incorporates Amendment No. 1 (May 1986) andAmendment No. 2 (January 2001). Side bar indicates modification ofthe text as the result of incorporation of the amendments.0.4 For the purpose of deciding whether a particular requirement ofthis standard is complied with, the final value, observed or calculated,expressing the result of a test or analysis, shall be rounded off inaccordance with IS : 2-1960*. The number of significant placesretained in the rounded off value should be the same as that of thespecified value in this standard.

1. SCOPE

1.1 This standard lays down the requirements regarding material,shape, dimensions and finish of washers required for water fittingsused for fire fighting purposes.

2. MATERIALS

2.1 Rubber — Where rubber is used for washers, it shall conform torequirement of hardness as applicable to Type 3 of IS : 5382-1985 andalso acid and alkali resistant ( see Note ).

*Rules for rounding off numerical values ( revised ).

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IS : 937 - 1981

4

NOTE — When a piece of 25 mm cut from any portion is dipped in 20 percentsulphuric acid/5 percent sodium hydroxide solution for 30 minutes, there shall be nosign of corrosion/damage.

2.2 Leather — Where leather is used, it shall be buffalo leather andshall conform to IS : 581-1976*.

3. TYPES

3.1 Washers shall be of two types based on shape, namely, Type A andType B ( see Fig. 1 and 2 ).

4. SIZES

4.1 The size and dimensions of Type A washers shall be in accordancewith Table 1 read with Fig. 1. The sizes and dimensions of Type Bwashers shall be in accordance with Table 2 read with Fig. 2.

5. WORKMANSHIP AND FINISH

5.1 Washers shall be free from surface imperfections, blisters,porosity, grittiness and foreign matter. The washers shall havesmooth finish.

6. MARKING

6.1 Each washer shall be clearly and permanently marked with thefollowing information:

a) Manufacturer’s name or trade-mark;b) Type of washer; andc) Year of manufacture.

6.1.1 The washers may also be marked with the ISI CertificationMark.

NOTE — The use of the ISI Certification Mark is governed by the provisions of theIndian Standards Institution (Certification Marks) Act and the Rules andRegulations made thereunder. The ISI Mark on products covered by an IndianStandard conveys the assurance that they have been produced to comply with therequirements of that standard under a well-defined system of inspection, testingand quality control which is devised and supervised by ISI and operated by theproducer. ISI marked products are also continuously checked by ISI for conformityto that standard as a further safeguard. Details of conditions under which a licencefor the use of the ISI Certification Mark may be granted to manufacturers orprocessors, may be obtained from the Indian Standards Institution.

*Specification for vegetable tanned hydraulic leather ( second revision ).

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IS : 937 - 1981

5

FIG. 1 TYPE A WASHER

TABLE 1 SIZES AND DIMENSIONS OF TYPE A WASHERS

( Clause 4.1 and Fig. 1 )

NOMINALSIZE OF

WASHER*

DIMENSIONS REMARKS

Dia A(Tolerance

)

Dia B(Tolerance

)

C(Tolerance ± 0.5 mm)

D(Tolerance ± 0.5 mm)

(1) (2) (3) (4) (5) (6)

63-mm 78 63 11.0 22.0 Used in female coupling

*Nominal size of water corresponds to the nominal size of the fitting in which thewasher is to be used.

+0–1

mm +1–0

mm

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IS : 937 - 1981

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FIG. 2 TYPE B WASHER

TABLE 2 SIZES AND DIMENSIONS OF TYPE B WASHERS

( Clause 4.1 and Fig. 2 )

SUB TYPE

NOMINALSIZE OF

WASHER*

DIMENSIONS REMARKS

Dia A(Tolerance

)

Dia B(Tolerance

)

Dia C(Tolerance ± 0.5 mm)

(1) (2) (3) (4) (5) (6)

mm mm mm mm

I 63 63.5 52.5 5.0 Used in branch pipeII 75

100125140

91.0116.0141.0153.0

68.093.0

118.0133.0

6.0

Used in suction hosecouplings, 2-wayand 3-way suctioncollecting headsand suctionstrainers,cylindrical type

III 75100125140

92.0117.0142.0154.0

56.081.0

106.0118.0

3.0

Used in suctionstrainers, shoetype

*Nominal size of washer corresponds to the nominal size of the fitting in which the washer is to be used.

+0–1

mm +1–0

mm

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IS : 937 - 1981

7

( Continued from page 2 )

Water Fittings for Fire Fighting Purposes Subcommittee, BDC 22 : 1

Convener Representing

SHRI P. N. MEHROTRA In personal capacity ( B-6/38-1, Safdarjang Enclave, New Delhi )

Members

SHRI K. K. DAS GUPTA West Bengal Fire Services, CalcuttaSHRI V. P. DEWAN Ministry of Defence (DGI)

LT-COL V. R. BANAHATI ( Alternate )SHRI P. N. GHOSH

SHRI S. BARDHAN ( Alternate )Ministry of Defence (R & D)

HYDRAULIC ENGINEER Municipal Corporation of Greater Bombay (Bombay Fire Brigade), Bombay

SHRI L. S. D. MEHERVANJEE ( Alternate )SHRI M. R. KAMAT Mather & Platt Ltd, BombaySHRI G. B. MENON Ministry of Home AffairsSHRI K. RUDRAPPA Engineers India Ltd, New DelhiSHRI J. V. SHAH

SHRI B. J. SHAH ( Alternate )Newage Industries, Surendranagar

SHRI S. S. L. SHARMA Municipal Corporation of Delhi (Delhi Fire Service), Delhi

SHRI R. S. SUNDERAM The Institution of Fire Engineers (India), New Delhi

SHRI A. N. AHLUWALIA ( Alternate )SHRI S. VENKASWAMY Directorate General of Civil Aviation, New Delhi

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INTERNATIONAL SYSTEM OF UNITS (SI UNITS)

Base Units

Quantity Unit Symbol

Length metre mMass kilogram kgTime second sElectric current ampere AThermodynamic temperature kelvin KLuminous intensity candela cdAmount of substance mole mol

Supplementary Units

Quantity Unit Symbol

Plane angle radian radSolid angle steradian sr

Derived Units

Quantity Unit Symbol Definition

Force newton N 1 N = 1 kg.m/s2

Energy joule J 1 J = 1 N.mPower watt W 1 W = 1 J/sFlux weber Wb 1 Wb = 1 V.sFlux density tesla T 1 T = 1 Wb/m2

Frequency hertz Hz 1 Hz = 1 c/s (s–1)Electric conductance siemens S 1 S = 1 A/VElectromotive force volt V 1 V = 1 W/APressure, stress pascal Pa 1 Pa = 1 N/m2

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Bureau of Indian StandardsBIS is a statutory institution established under the Bureau of Indian Standards Act, 1986 topromote harmonious development of the activities of standardization, marking and qualitycertification of goods and attending to connected matters in the country.

CopyrightBIS has the copyright of all its publications. No part of these publications may be reproduced in anyform without the prior permission in writing of BIS. This does not preclude the free use, in thecourse of implementing the standard, of necessary details, such as symbols and sizes, type or gradedesignations. Enquiries relating to copyright be addressed to the Director (Publications), BIS.

Review of Indian StandardsAmendments are issued to standards as the need arises on the basis of comments. Standards arealso reviewed periodically; a standard along with amendments is reaffirmed when such reviewindicates that no changes are needed; if the review indicates that changes are needed, it is taken upfor revision. Users of Indian Standards should ascertain that they are in possession of the latestamendments or edition by referring to the latest issue of ‘BIS Catalogue’ and ‘Standards : MonthlyAdditions’.This Indian Standard has been developed by Technical Committee : BDC 22 and amended byCED 22

Amendments Issued Since Publication

Amend No. Date of Issue

Amd. No. 1 May 1986Amd. No. 2 January 2001

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