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ASME A I 12.4.1-1993-Water Heater Relief Valve Drain Tubes AN AMERICAN NATIONAL STANDARD$The American Society of Mechanical Engineers Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS-,-,-ASME A332.4.3 93 W O759670 0543693 42T W AN AMERICAN NATIONAL STANDARD 1 Water Heater Relief Valve Drain Tubes ASME AI 12.4.1-1993 The American Society of Mechanical Engineers I I I 345 East 4 7 t h Street,New York,N.Y.1001 7-Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS-,-,-Date of Issuance:June 3,1994 This Standard will be revised when the Society approves the issuance of a new edition.There will be no addenda or written interpretations of the requirements of this Standard issued to this Edition.ASME is the registered trademark of The American Society of Mechanical Engineers This code or standard was developed under procedures accredited as meeting the criteria for American National Standards.The Consensus Committee that approved the code or standard was balanced to assure that individuals from competent and concerned interests have had an oppor-tunity to participate.The proposed code or standard was made available for public review and comment which provides an opportunity for additional public input from industry,academia,reg-ulatory agencies,and the public-at-large.ASME does not approve,rate,or endorse any item,construction,proprietary device,or activity.ASME does not take any position with respect to the validity of any patent rights asserted in connection with any items mentioned in this document,and does not undertake to insure anyone utilizing a standard against liability for infringement of any applicable Letters Patent,nor assume any such liability.Users of a code or standard are expressly advised that determination of the validity of any such patent rights,and the risk of infringement of such rights,is entirely their own responsibility.Participation by federal agency representative(s)or person(s)affiliated with industry is not to be interpreted as government or industry endorsement of this code or standard.ASME accepts responsibility for only those interpretations issued in accordance with governing ASME procedures and policies which preclude the issuance of interpretations by individual vol-unteers.No part of this document may be reproduced in any form,in an electronic retrieval system or otherwise,without the prior written permission of the publisher.Copyright 0 1994 by THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS All Rights Reserved Printed in U.S.A.Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS-,-,-ASME A112.4-1 93 O759670 0543b73 2T2 FOREWORD(This Foreword is not part of ASME Al 12.4.1-1993.)There are potential hazards associated with heating of water in a closed vessel,as the po-tential for excessive temperature or pressure development within such closed systems is always present.In order to reduce the hazards associated with water heating,two special amendments have been added to the plumbing codes and standards over the past few decades which have resulted in much safer installations.The first requirement was that which involved the instal-lation of a high limit control in the water heating assembly,which deactivates the fuel gas control mechanism if the water heating device exceeds a specific temperature.The second requirement involved the installation of a temperature and pressure relief valve,which is de-signed to open to atmosphere if the water temperature or pressure within a vessel exceeds the defined specifications of the valve.Properly inspected and maintained,these devices provide the“state-of-the-art”in water heater safety.It should be known,however,that the effectiveness of the relief valve is based upon its ability to relief the hot water or steam as quickly,yet as safely,as possible.Typically,for the safety of the building inhabitants,a pipe or tubing is installed at the outlet of the relief valve to direct the hot water or steam flow to a safe point.However,the installation of the drain must not create a hazard.The installation of any drain piping or tubing downstream of the relief valve must provide for the free passage of steam or hot water discharge.The drain tubing should not be trapped.The drain should be of full nominal size of the relief valve outlet and should not be discharged where the outlet could freeze.No threads should exist on the terminal end of the relief valve drain tube.For many years,relief valve drains were field-fabricated from metallic piping.With the increasing use of plastics and the need for more expedient installations of plumbing compo-nents,the ASME Panel 4 undertook the task of developing criteria for the performance of water heater relief valve drains.The ASME All2 Main Committee approved the Standard and it was subsequently adopted as an American National Standard by the American National Standards Institute on November 12,1993.111 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS-,-,-ASME STANDARDS COMMITTEE A I 12 Standardization of Plumbing Materials and Equipment(The following is the roster of the Committee at the time of approval of this Standard.)OFFICERS P.J.Higgins,Chairman P.D.Stumpf,Secretary COMMITTEE PERSONNEL R.H.Ackroyd,Watts Regulator Co.,North Andover,Massachusett J.A.Ballanco,JB Engineering,Munster,Indiana S.L.Cavanaugh,Delta Faucet Co.,Indianapolis,Indiana A.Cohen,Copper Development Association,Inc.,New York,New York P.V.DeMarco.American Standard,Inc.,Trenton,New Jersey L.S.Galowin,National Bureau of Standards,Gaithersburg,Maryland R.I.Greenwald,EBCO Manufacturing Co.,Columbus,Ohio E.Grunewald.Kitchen Aid,Division of Whirlpool,St.Joseph,Michigan P.J.Higgins.Chairman,P.J.Higgins and Associates,Inc.,Frederick,Maryland M.Klimboff,Consultant,Cincinnati,Ohio R.M.Martin,California Energy Commission,Sacramento,California R.E.Pamplona.U.S.Naval Facilities Engineering Command,Port Hueneme,California S.Rawalpindawala,IAPMO,Walnut,California S.Remedios.Canadian Standards Association,Ontario,Canada J.Sargent,Kohler Co.,Kohler,Wisconsin R.C.Smith,United States Testing Co.,Inc.Tulsa,Oklahoma P.D.Stumpf,Secretary,The American Society of Mechanical Engineers,New York,New York R.E.White,Repairs,Inc.,South Bend,Indiana PERSONNEL OF PANEL 4-SPECIALTY DEVICES P.J.Higgins.Chairman,P.J.Higgins and Associates,Inc.,Frederick,Maryland R.E.Pamplona.U.S.Naval Facilities Engineering Command,Port Hueneme.California J.Sargent,Kohler Co.,Kohler,Wisconsin R.C.Smith,United States Testing Co.,Inc.,Tulsa,Oklahoma R.E.White,Repairs,Inc.,South Bend,Indiana V Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS-,-,-ASME A212-4.2 73 W 0759670 0543675 075=CONTENTS.Foreword.111 Standards Committee Roster.v 1 Scope.Purpose.and Reference Standards.1 2 General Requirements.1 3 Test Methods and Performance Requirements.1 vii Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS-,-,-ASME ALL2.4=L 93=07.59670 0543bqb TOL D ASME A l 12.4.1-1 993 WATER HEATER RELIEF VALVE DRAIN TUBES 1 SCOPE,PURPOSE,AND REFERENCE 1.1 Scope This Standard covers the test methods and perfor-mance requirements applicable to water heater relief valve drain(or runoff)tubes for use with listed relief valves having a steam rating of 100,OOO Btu per hour(Btuh)or less.STANDARDS 1.2 Purpose This Standard shall serve as a uniform reference doc-ument for use by manufacturers,inspectors,contrac-tors,and installers to identify criteria applicable to water heater relief valve drain tubes.1.3 Reference Standards The following reference standards shall be used to evaluate the product,and are cited herein.Unless indi-cated,the latest edition of these standards shall be ap-plicable for certification to this Standard.ASMEANSI B1.20.1-1983,Pipe Threads(Except Dryseal)ANSI 221.22-1986,Water Heater Relief Valves 2 GENERAL REQUIREMENTS 2.1 Size The drain tube shall have a minimum inside diameter of 0.75 in.and a minimum length of 48 in.2.2 Material The material which is used in the composition of the drain tube shall be capable of withstanding the temper-ature tests cited in Section 3 without collapse or per-manent distortion.Materials shall be corrosion resist-ing.2.3 Joints Any joints within the tube shall be firmly affixed and shall withstand the temperature tests without separation or leakage.Assembly of the drain tube to the relief valve shall be possible by hand-tightening only.Connecting threads shall comply with ASME/ANSI B1.20.1 for 0.75 t3/4)in.pipe threads.2.4 Installation Instructions Installation instructions,including post-installation relief valve testing procedures,shall be provided with the unit.A permanent tag or label relating to the relief valve test procedures shall be provided with the device.2.5 Marking and Identification be permanently marked on the drain tube.2.5.2 For products intended for other than OEM ap-plications,the limitations of installation for the drain tube shall be permanently marked on the tube in letter-ing not less than 0.125 in.in height.For example:T&P VALVES WITH 100,000 BTUH OR LESS RATING”or“NO PIPE SEALANTS”.2.5.1 The manufacturers name or trademark shall“HAND-TIGHTEN ONLY”,“USE ONLY ON 3 TEST METHODS AND PERFORMANCE REQUIREMENTS 3.1 Temperature Test 3.1.1 Test Equipment.A steam generating source capable of producing 100,000 Btuh at 15 psig pressure and 250F temperature shall be used to conduct this test.The steam source shall be fitted with instruments which measure pressure and temperature.The steam source shall be connected to a 0.75(3/4)in.relief valve which complies with ANSI 221.22.The relief valve shall be mounted horizontally and the drain tube shall be installed in a downward position.For drain tubes intended for installation in relief valve locations in the top of a water 1 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS-,-,-ASME A112.4.L 93 O759670 0543697 948 ACME A112.4.1-1993 heater,the test assembly shall be installed with the relief valve in a horizontal position and the drain tube connected and tested accordingly.3.1.2 Test Method.Prior to connecting this test,the inside diameter and length of the drain tube shall be measured and recorded.A thermocouple shall be at-tached to the outside surface of the drain tube within 3 f 0.5 in.of the relief valve in order to measure the equilibrium temperature.The steam generator shall be activated and the relief valve shall be manually locked in an open position.Steam discharge conditions of WATER HEATER RELIEF VALVE DRAIN TUBES 100,OOO Btuh,pressure ratings of 15 psig,and temper-ature valves of 250F shall be established.When the thermocouple on the drain tube assembly indicates equi-librium temperature has been attained,the test shall con-tinue for 15 minutes.After 15 minutes,the steam gen-erator shall be deactivated and the drain tube shall be allowed to cool.The drain tube shall be evaluated against its original baseline dimensions.3.1.3 Performance Requirements.The drain tube shall maintain its original inside diameter and shall not exceed f 0.25 in.from its original length.2 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS-,-,-ASME ALL2mY.L 73 W 0757670 0543678 884 ASME STANDARDS RELATED TO PLUMBING Air Gaps in Plumbing Systems.A l 12.1.2-1991 Performance Standard and Installation Procedures for Stainless Steel Drainage Systems for Sanitary Storm and Chemical Applications.Above and Below Ground.A112.3.1-1993 Water Heater Relief Valve Drain Tubes.A l 12.4.1-1993 Supports for Off-the-Floor Plumbing Fixtures for Public Use.A112.6.1M-1990 Backwater Valves.A l 12.14.1-1975(R1990)Plumbing Fixture Fittings.A l 12.18.1M-1989 Enameled Cast Iron Plumbing Fixtures.A l 12.19.1 M-1987 Vitreous China Plumbing Fixtures.A l 12.19.2M-1990 Stainless Steel Plumbing Fixtures(Designed for Residential Use).A l 12.19.3M-1987 Porcelain Enameled Formed Steel Plumbing Fixtures.A112.19.4M-1984 Trim for Water-closet Bowls,Tanks.and Urinals.A l 12.19.5-1979(R1990)Hydraulic Requirements for Water Closets and Urinals.A112.19.6-1990 Whirlpool Bathtub Appliances.A l 12.19.7M-1987 Suction Fittings for Use in Swimming Pools.Wading Pools.Spas.Hot Tubs.and Whirlpool Bathtub Appliances.A l 12.19.8M-1987 Non-vitreous Ceramic Plumbing Fixtures.A l 12.19.9M-1991 Floor Drains.A l 12.21.1M-1991 Roof Drains.A l 12.21.2M-1983 Hydrants for Utility and Maintenance Use.A l 12.21.3M-1985 Water Hammer Arresters.A l 12.26.1M-1984 Cleanouts.A l 12.36.2M-1991 The ASME Publications Catalog shows a complete list of all the Standards published by the Society.For a complimentary catalog.or the latest information about our publications.call 1-800-THE-ASME(1.800.843.2763).Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS-,-,-Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS-,-,-