[www.staffempire.com]-MSS SP-61-2009 阀门压力试验(Pressure Testing of Valves).pdf

MSS SP-61-2009 Pressure Testing of Valves Standard Practice Developed and Approved by the Manufacturers Standardization Society of the Valve and Fittings Industry,Inc.127 Park Street,NE Vienna,Virginia 22180 Phone:(703)281-6613 Fax:(703)281-6671 E-Mail:infomss-hq.org www.mss-hq.org MSS STANDARD PRACTICE SP-61 iThis MSS Standard Practice was developed under the consensus of the MSS Technical Committee 114 and the MSS Coordinating Committee.The content of this Standard Practice is the result of the efforts of competent and concerned volunteers to provide an effective,clear,and non-exclusive specification that will benefit the industry as a whole.This MSS Standard Practice is intended as a basis for common practice by the manufacturer,the user,and the general public.The existence of an MSS Standard Practice does not in itself preclude the manufacture,sale,or use of products not conforming to the Standard Practice.Mandatory conformance is established only by reference in a code,specification,sales contract,or public law,as applicable.Unless otherwise specifically noted in this MSS SP,any standard referred to herein is identified by the date of issue that was applicable to the referenced standard(s)at the date of issue of this MSS SP.(See Annex A.)In this Standard Practice all notes,annexes,tables,and figures are construed to be essential to the understanding of the message of this Standard Practice,and are considered part of the text unless noted as supplemental.All appendices appearing in this document are construed as supplemental.Supplemental information does not include mandatory requirements.U.S.customary units in this SP are the standard;the metric units are for reference only.Non-toleranced dimensions in this Standard Practice are nominal,and,unless otherwise specified,shall be considered for reference only.Any part of this Standard Practice may be quoted.Credit lines should read Extracted from MSS SP-61-2009 with permission of the publisher,the Manufacturers Standardization Society.Reproduction prohibited under copyright convention unless written permission is granted by the Manufacturers Standardization Society of the Valve and Fittings Industry,Inc.Originally Approved February,1961 Copyright,1985 by Manufacturers Standardization Society of the Valve and Fittings Industry,Inc.Printed in U.S.A.-,-,-标准分享网 w w w.b z f x w.c o m 免费下载w w w.b z f x w.c o mMSS STANDARD PRACTICE SP-61 ii FOREWORD This Standard Practice for Pressure Testing of Valves was originally adopted in 1961.It was developed for the purpose of providing a uniform means of testing valves commonly used in the full open and full closed type of service.It is not intended for use with control valves.Refer to standards ISA-S75.19 and ANSI/FCI 70-2 for Control Valves.-,-,-w w w.b z f x w.c o mMSS STANDARD PRACTICE SP-61 iiiTABLE OF CONTENTS SECTION PAGE 1 SCOPE.1 2 DEFINITIONS.1 3 GENERAL REQUIREMENTS.1 4 SHELL LEAKAGE TESTS.2 5 SEAT CLOSURE TESTS.2 TABLE 1 Shell Leakage Test Duration.2 2 Alternate Gas Test.2 3 Seat Closure Test Duration.3 4 Units of Leakage per NPS/DN.3 ANNEX A Referenced Standards and Applicable Dates.4-,-,-标准分享网 w w w.b z f x w.c o m 免费下载w w w.b z f x w.c o m 11.SCOPE This Standard Practice establishes requirements and acceptance criteria for shell and seat closure pressure testing of valves.2.DEFINITIONS 2.1 Production Pressure Test Pressure tests which include closure member and shell leakage tests shall be performed on production units manufactured for sale.Production pressure tests verify the pressure containing capability of production units.2.2 Shell Leakage Test An internal pressure test of the pressure containing envelope to demonstrate pressure containing capability of the external pressure boundary.2.3 Seat and Closure Member Test An internal pressure test of flow regulating elements(seats,seals,and closure member such as gate,disc,ball,or plug)to demonstrate static performance within allowable leakage tolerances.2.4 No Visible Leakage 2.4.1 The term no visible leakage applied to a hydrostatic test liquid is defined as a leak rate that will produce:no visible weeping or formation of drops at the test pressure and for the duration of the test.2.4.2 The term no visible leakage applied to air or gas testing is defined as a leak rate that will produce no visible formation of bubbles in a water immersion test or after application of leak detection fluid at the test pressure and for the duration of the test.Note:(1)This leakage rate is based on the measured leakage of nitrogen gas from a needle valve with a 0.167 OD.x 0.091 I.D.tube submerged in water to a depth of 1.The tube end was cut square and smooth with no chamfers or butts and the tube axis was parallel to the surface of the water.Leakage was adjusted to a level equal to 40 bubbles in 10 minutes at 90 psi.The 40 bubbles equaled 1.6 ml or,1 bubble=0.04 SCC.Using these data,a leak rate equivalent to 1 bubble every minute is found to be 4.1 x 10-5 in3/sec(6.7 x 10-4 ml/sec).2.4.3 For automatic leak detection methods,this definition shall be considered equivalent to a leak rate no greater then 4.1 x 10-5 in3/sec(l)(6.7 x 10-4 ml/sec)with a pressure differential of 80 to 100 psi(5.5 to 6.9 bar)for application to valves of NPS 8(DN 200)and smaller.3.GENERAL REQUIREMENTS 3.1 The manufacturer shall be responsible for the performance of tests specified herein.3.2 Fluid for shell and seat closure tests shall be air,inert gas,or liquid,such as water(which may contain a corrosion inhibitor),kerosene,or other fluid with viscosity not greater than that of water.Temperature of the test fluid shall not exceed 125F(52C).3.3 Valves shall be substantially relieved of air or gas when tested with liquid.3.4 Seat closure tests for NPS 4(DN 100)and larger valves shall be conducted after an acceptable shell test.Seat closure tests for smaller valves may be conducted before or after the shell test at the manufacturers option.However,when valves conform to ASME B16.34,the requirements of paragraph 7.2 of ASME B 16.34 shall apply.3.5 Valves shall be shell tested prior to painting.Corrosion protection treatment such as phosphatizing and linings may be applied prior to shell testing.If pressure tests in the presence of purchasers representative are specified,valves that were painted following successful pressure testing may be retested without removal of paint.3.6 Valve test fixture loads applied to valve ends shall be limited to those required to effectively seal the valve ends.3.7 Leakage detection devices,e.g.,pressure decay devices,may be used for detecting leakage provided that they perform at the pressures specified in Sections 4 and 5.The valve manufacturer shall be able to demonstrate that,when these devices are used,the test results are equivalent to the requirements of this Standard Practice.PRESSURE TESTING OF VALVES-,-,-w w w.b z f x w.c o m 24.SHELL LEAKAGE TESTS 4.1 Each valve shall be given a shell leakage test at a gauge pressure no less than 1.5 times the valves 100F(38C)design pressure rating,rounded off to the next higher 25 psi(1 bar)increment.4.2 Shell leakage tests shall be conducted with the valve in the partially open position and with the valve ends closed.Pressure retaining parts of valves may be tested separately when the valves have internal components,such as diaphragms in diaphragm valves,that are not designed to withstand required shell test pressures.The manufacturers nameplate data shall contain reference to this limitation.4.3 Visual leakage through the pressure boundary walls is not acceptable.Stem seal leakage during shell test shall not be cause for rejection.Stem seals shall be capable of retaining pressure at least equal to the valves 100F(38C)design pressure rating without visible leakage.4.4 The minimum duration of the shell leakage test shall be per Table 1.TABLE 1 Shell Leakage Test Duration VALVE SIZE TEST TIME NPS DN(SECONDS)2 and Smaller 50 and Smaller 15 2 1/2-8 65-200 60 10 and Larger 250 and Larger 180 5.SEAT CLOSURE TESTS 5.1 Each valve designed for shutoff or isolation service,such as stop valves and check valves,shall be given a fluid seat closure tightness test.5.1.1 The seat closure test shall be performed at a fluid(liquid or gas)pressure no less than 1.1 times the valves 100F(38C)design pressure rating rounded to the next higher 5 psi(0.5 bar).At the manufacturers option,a gas pressure of no less than 80 psi(5.6 bar)may be substituted for the valve sizes and pressure classes listed in Table 2.TABLE 2-Alternate Gas Test Valve Size Pressure Class NPS(DN)CLASS 12(300)and Smaller 300 and Lower 4(100)and Smaller All 5.1.2 Seat closure testing shall be performed with seat surfaces free of materials that aid in sealing except as provided for in Sections 5.1.3 and 5.1.4.5.1.3 When necessary to prevent damage during valve actuation,a light oil of viscosity no greater than that of kerosene may be applied to seating surfaces.5.1.4 When a valves primary seat design is based on the presence of a sealant material,e.g.,lubricated plug valves,the sealant material may be in place.When it is intended that sealants act as secondary or back-up seat seals,the sealant material shall not be in place during the closure test.5.1.5 When lubricants are used for assembly operations,it is not required that these be removed prior to testing if their presence has no influence on the test results.5.2 For valves of the double seating type such as many gate,plug,and ball valves,the test pressure shall be applied successively to each end of the closed valve and leakage to the opposite end checked.5.2.1 As alternate methods for valves with independent double seating(such as double disc or split wedge gate valves),at the option of the manufacturer,the pressure may be applied inside the bonnet(or body)of the closed valve and each seat checked for leakage at the valve ports,or the pressure may be applied to the valve ports and the sum of seat leakage checked at the bonnet(or body).These alternate methods may be used at the option of the manufacturer for valves with single discs(such as solid or flexible wedge gate valves)provided a supplementary closure member test across the disc is performed.标准分享网 w w w.b z f x w.c o m 免费下载w w w.b z f x w.c o m 35.3 For other valve types,the test pressure shall be applied across the closure member in the direction producing the most adverse seating condition.For example,a globe valve shall be tested with pressure under the disc.A check valve,or other valve type designed,sold,and marked as a one-way valve,requires a closure test only in the appropriate direction.A stop check valve requires both tests.5.4 Valves conforming to this Standard Practice in all respects,except that they are designed for operating conditions that have pressure differential across the closure member limited to values less than the 100F(38C)pressure rating and having closure members and/or actuating devices(direct,mechanical,fluid,or electrical)that would be subject to damage at high differential pressures,shall be tested as described above except that the closure test requirement may be reduced to 1.1 times the maximum specified closed position differential pressure.This exception may be exercised upon agreement between the purchaser and manufacturer.The manufacturers name plate data shall include reference to any such limitations.5.5 Valves of single or symmetrical seat design,capable of seating in two directions,e.g.,butterfly or weir type diaphragm valves,require seat testing in only one direction.5.6 Butterfly valves of the offset stem-seat design may be closure tested in only one direction.The manufacturer shall be able to demonstrate that the direction selected is that least likely to attain effective tightness.5.7 Allowable leakage rates,except for the conditions of Sections 5.7.2 and 5.7.3 shall be as in Section 5.7.1.5.7.1 The maximum allowable leakage of each seat closure shall be 10 ml/hr of liquid or 0.1 standard cuft/hr of gas per unit of NPS(0.4 ml/hr of liquid or 120 standard ml/hr of gas per unit of DN)under the specified test condition.See Table 4.5.7.2 In the case of valves having pressure or flow reversal actuated closure,e.g.,check valves,the allowable leakage rate may be increased by a factor of 4.5.7.3 In the case of valves having a seat closure member that uses a compliant material,e.g.,plastic or elastomer,for fluid sealing at closure,there shall be no visible leakage for the duration of the seat test.5.8 The duration of each seat closure test shall be per Table 3.TABLE 3 Seat Closure Test Duration VALVE SIZE TEST TIME NPS DN(SECONDS)2 and Smaller 50 and Smaller 15 21/2-8 65-200 30 10-18 250-450 60 20 and Larger 500 and Larger 120 TABLE 4 Units of Leakage per NPS/DN LIQUID GAS Per NPS Per DN Per NPS Per DN 10 cc/hr 0.4 cc/hr 0.1 SCFH 2.88 SCIM 120 cc/hr 0.167 cc/min.6.6 x10-3 cc/min.47.2 cc/min.2cc/min.2.66(1)drops/min.0.11(1)drops/min.1180(2)bubble/min50(2)bubble/min General Notes:1.1 ml=1 cc 2.SCFH=Standard cubic feet per hour(14.7 psia 60F)(1.01 bar 16C)3.SCIM=Standard cubic inch per minute(14.7 psia 60F)(1.01 bar 16C)Notes:(1)For information only.Based on 16 drops per cc,which is the equivalent of a spherical shaped drop having an approximate diameter of cm(3/16 inch).(2)For information only.Based on 25 bubbles per cc,which is the equivalent of a spherical shaped bubble having an approximate diameter of 0.42 cm(5/32 inch).See Page 1,Footnote(1).-,-,-w w w.b z f x w.c o m 4ANNEX A Referenced Standards and Applicable Dates This Annex is an integral part of this Standard Practice and is placed after the main text for convenience.Standard Name or Designation ASME,ANSI/ASME,ANSI,ASME/ANSI B16.34 2004 Valves-Flanged,Threaded and Welding End FCI 70-2 2006 Control Valve Seat Leakage ISA S75.19.01 2007 Hydrostatic Testing of Control/Valves Publications of the following organizations appear in the above list:ANSI American National Standards Institute,Inc.25 West 43rd Street New York,NY 10036 ASME The American Society of Mechanical Engineers Three Park Avenue New York,NY 10016-5990 FCI Fluid Controls Institute 1300 Sumner Avenue Cleveland,OH 44115 ISA ISA-The Instrumentation,Systems,and Automation Society 67 Alexander Drive Research Triangle Park,NC 27709-,-,-标准分享网 w w w.b z f x w.c o m 免费下载 List of MSS Standard Practices(Price List Available Upon Request)Number SP-6-2007 Standard Finishes for Contact Faces of Pipe Flanges and Connecting-End Flanges of Valves and Fittings SP-9-2008 Spot Facing for Bronze,Iron and Steel Flanges SP-25-2008 Standard Marking System for Valves,Fittings,Flanges and Unions SP-42-2009 Corrosion Resistant Gate,Glove,Angle and Check Valves with Flanged and Butt Weld Ends(Classes 150,300&600)SP-43-2008 Wrought and Fabricated Butt-Welding Fittings for Low Pressure,Corrosion Resistant Applications SP-44-2006 Steel Pipeline Flanges SP-45-2003(R 08)Bypass and Drain Connections SP-51-2007 Class 150LW Corrosion Resistant Flanges and Cas