[www.staffempire.com]-MSS SP-72-2010 法兰端或对焊端通用球阀.pdf

MSS SP-72-2010 Ball Valves with Flanged or Butt-Welding Ends for General Service 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 PRACTICESP-72 iThis MSS Standard Practice was developed under the consensus of the MSS Technical Committee 401 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.Other standards documents referred to herein are identified by the date of issue that was applicable to this Standard Practice at the date of issue of this Standard Practice.See Annex A.This Standard Practice shall remain silent on the applicability of those other standards of prior or subsequent dates of issue even though applicable provisions may not have changed.References contained herein which are bibliographic in nature are noted as supplemental in the text.”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 Standard Practice(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 the standard,and are considered part of the text unless noted as supplemental.All appendices,if included,that appear in this document are construed as supplemental.Supplemental information does not include mandatory requirements.U.S.customary units in this Standard Practice are the standard;metric(SI)units are for reference only.Substantive changes in this 2010 edition are“flagged”by parallel bars as shown on the margins of this paragraph.The specific detail of the change may be determined by comparing the material flagged with that in the previous edition.Any part of this Standard Practice may be quoted.Credit lines should read Extracted from MSS SP-72-2010 with permission of the publisher,Manufacturers Standardization Society of the Valve and Fittings Industry,Inc.Reproduction prohibited under copyright convention unless written permission is granted by Manufacturers Standardization Society of the Valve and Fittings Industry,Inc.Originally Approved:February 1970 Copyright,2010 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MSS STANDARD PRACTICESP-72 iiFOREWORD The 1999 Edition of MSS SP-72 was updated from the 1992 Edition by revising material names in Sections 1.4,2.1.5.,2.1.6,and 4.1.Metric data(DN)and(PN)was added to Sections 1.3,3.1.1,5.2.2.1,7.1.3,7.1.4,7.2.2,7.2.3,and Table 1.The formulas in Sections 7.1.4 and 7.2.2 was revised to agree with MSS IS-9 formatting.The reference to NPS was corrected in all applicable Sections.Annex A listing all referenced standards documents was added.This 2010 Edition of MSS SP-72 has been substantively updated from the 1999 Edition by revising material in Section 7.2.4.Annex A listing all referenced standards documents has been revised.MSS STANDARD PRACTICESP-72 iii TABLE OF CONTENTS SECTION PAGE 1 SCOPE.1 2 SERVICE PRESSURE RATINGS.1 3 VALVE PORT SIZES.1 4 MATERIALS.2 5 DESIGN.2 6 MARKING.3 7 TESTING.3 TABLE 1 Port Sizes for Less than Full Port Ball Valves.5 FIGURE 1 Examples of Body Construction.6 2 Nomenclature for Ball Valve Parts,Typical.7 ANNEX A Referenced Standards and Applicable Dates.8 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 PRACTICESP-72 11.SCOPE 1.1 This Standard Practice covers flanged or butt-weld end ball valves having in general,but not restricted to,round openings which may be full port,regular port,or reduced port types.The following characteristics shall be considered standard practice unless otherwise specified by agreement between manufacturer and purchaser.1.2 Valves covered by this Standard Practice are suitable for use in general liquid and gas service.Their service pressures and temperatures generally conform to standards cited in Paragraph 2,but may be restricted by the materials used for their seats and seals,or by other special considerations.1.3 The size range covered by this Standard Practice is NPS (DN 15)through NPS 36(DN 900).1.4 This Standard Practice covers ball valves of the following materials:Carbon Steel Alloy Steels Stainless Steels Ductile Iron Gray Iron Copper Alloy 1.5 Names of common valve body types are given in Figure 1.When variations or other body types are used,they may be named by the manufacturer.The names of basic valve parts are given in Figure 2.Other parts may be named by the manufacturer.Body types and valve parts may also be identified by applicable MSS or other terminology standards.2.SERVICE PRESSURE RATINGS 2.1 The pressure temperature rating of flanged and Buttwelding end ball valves shall conform to those set forth in the Standards listed below,except as they are limited by their seat and seal materials.2.1.1 Carbon Steel ASME B16.5&ASME B16.34 2.1.2 Alloy Steels ASME B16.5&ASME B16.34 2.1.3 Stainless Steels ASME B16.5&ASME B16.34 2.1.4 Ductile Iron ASME B16.42 2.1.5 Gray Iron ASME B16.1 2.1.6 Copper Alloy ASME B16.24 2.2 Cold Working Pressure(CWP)The cold working pressure rating of the valve shell and components is the rated pressure at 100F(38C)for carbon steel,alloy steel,stainless steel,and ductile iron,and 150F(66C)for copper alloy.The maximum working pressure at any other temperature shall not exceed this rated pressure.3.VALVE PORT SIZES 3.1 Ball valves may be furnished as either full port,regular port or reduced port.3.1.1 Full Port valves are defined as having minimum bore diameters as specified in Annex A of ASME B16.34 for valves up to NPS 30(DN 750).A tolerance of-.06 inches(1.52 mm)is allowed on NPS 12(DN 300)and smaller valves.A tolerance of-0.12 inches(3.05 mm)is allowed on NPS 14(DN 350)and larger valves.Oversize tolerance is not specified.For valves above NPS 30(DN 750),bore diameter shall be as agreed upon between purchaser and manufacturer.BALL VALVES WITH FLANGED OR BUTT-WELDING ENDS FOR GENERAL SERVICE w w w.b z f x w.c o mMSS STANDARD PRACTICESP-72 24.MATERIALS 4.1 Valve Shell Parts and Bolting The valve shell parts are defined as those which contain pressure within the piping but do not include the ball,seats,seals,and other parts.This Standard Practice covers only pressure retention bolting.Mechanical connections and bolting for end flanges are not included.Recommended materials for valve shell parts and bolting are those which are in conformance to the specifications listed in Sections 2.1.1 thru 2.1.6.When alternate materials are used,the manufacturer shall be prepared to certify,based on documentation from producer or recognized distributor of these alternate materials,that the products are at least equally suitable for the intended use.4.2 Other Parts Parts such as stems,glands,gland bushings,balls,handwheels,gearing and motor drive,and seats or seals,shall be of materials suitable for the service.Non-metallic seats or seals,when employed,shall be designed by the manufacturer with suitable material selected for compatibility with the temperature,pressure and line fluids for which the valves are recommended.5.DESIGN 5.1 The design of the valve shell is such as to provide against any detrimental distortion under hydrostatic test conditions,assembly stresses,closing stresses,pipe reaction stresses or when rated pressure is applied across a closed valve.5.2 End Connections and End Preparation 5.2.1 End flange dimensions shall conform to those set forth in the applicable standards listed in Sections 2.1.1 thru 2.1.6,or MSS SP-44.5.2.2 Butt-Welding Ends 5.2.2.1 Sizes NPS 6(DN 150)and smaller of carbon steel,Class 150 through 900 Unless otherwise specified,butt-welding ends shall conform to ASME B16.34 and valve ends shall be bored to match Schedule 40 Pipe for Class 150 and 300,and Schedule 80 Pipe for Class 400 through 900.5.2.2.2 Sizes NPS 2 and smaller of stainless steel,Class 150 and 300 Unless otherwise specified,butt-welding ends shall be bored to match Schedule 10S Pipe.5.2.2.3 For all other butt-welding end valves covered by this Standard Practice,the purchaser shall specify the bore of the valve ends.Unless otherwise specified by the purchaser,the welding end preparation shall be optional with the manufacturer.5.3 Valve Length 5.3.1 Face-to-Face dimensions of flanged ball port or top opening valves may not be available within the short pattern lengths shown in ASME B16.10.(These valves may have face-to-face dimensions as agreed upon by the purchaser and manufacturer.)5.3.2 End-to-end dimensions of butt-welding end ball valves shall conform to ASME B16.10,or such other dimensions as shall be agreed upon by the purchaser and manufacturer.5.4 Auxiliary Connections 5.4.1 When connections are provided,they shall be in accordance with ASME B16.34.The number and location shall be optional with the manufacturer or by agreement between the manufacturer and the purchaser.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 PRACTICESP-72 35.5 Operation Valves shall be furnished with a means of operation,such as a lever or actuator,adequately sized to actuate the valve with reasonable effort by the operator under the rated working pressure.5.6 Position Indication Stems,stem extensions,adapters and actuators shall be provided with positive means for indicating port position.6.MARKING 6.1 Ball valves shall be marked in accordance with MSS SP-25.7.TESTING 7.1 Shell Test 7.1.1 Ball valves shall be given a hydrostatic shell test at 1 times the rated cold working pressure of the valve.7.1.2 The ball shall be partially open during the shell test unless other means are provided for assuring equalization of pressure throughout the shell.7.1.3 The duration of the shell test shall not be less than shown below:Valve Size Test Time Second NPS DN 2 and smaller 50 and smaller 15 2-8 65-200 60 10 and larger 250 and larger 120 Time duration is the period of inspection after the valve is fully prepared and under test pressure.7.1.4 For valves of Class 150 and Class 300,in sizes NPS 3(DN 80)and smaller,a minimum of 80 psig(6 Bar)gas test with a minimum 15 second duration may be substituted.However,if this option is exercised,the manufacturer shall be able to certify that a production sample of the size valve so tested was subjected to a hydrostatic shell test of“F”times the cold working pressure of valve where F=2 AYS1/MYS1 or F=2 AYS2/MYS2 or F=2 AYS3/MYS3 whichever is larger,with no detrimental distortion and where AYS1=Actual Yield Strength of Body MYS1=Minimum Specified Yield Strength of Bonnet AYS2=Average Yield Strength of Bonnet MYS2=Minimum Specified Yield Strength of Bonnet AYS3=Average Yield Strength of Bonnet Bolting MYS3=Minimum Specified Yield Strength of Bonnet Bolting 7.1.5 Visually detectable leakage through pressure boundary walls is not acceptable.Leakage through the stem packing shall not be cause for rejection.The stem packing shall be capable of retaining pressure at least equal to the rated cold working pressure of the valve without visible leakage.7.2 Seat Tests 7.2.1 Ball valves shall be given a seat test in a manner which will test the tightness of the seat in the direction of flow as indicted on the valve,or in both directions,when flow direction is not indicated on valve.The method of seat leakage testing on each seat shall be such that no seat leakage can escape detection because of gradual pressurization or filling of cavity between two seats.Also the method of testing shall apply the pressure differential on the tested seat in the same direction as pressure is applied on this seat in service.w w w.b z f x w.c o mMSS STANDARD PRACTICESP-72 4 7.2.2 Ball valves shall be given a hydrostatic seat test at the rated cold working pressure of the valve.On valves NPS 12(DN 300)and smaller,an 80 psig(6 Bar)gas seat test may be substituted for the hydrostatic seat test.However,if this option is exercised,the manufacture shall be able to certify that a production sample of the size so tested was subjected to a hydrostatic seat test of“F”times the cold working pressure of valve where F=2 AYS4/MYS4 or F=2 AYS5/MYS5 or F=2 AYS6/MYS6 whichever is larger,with no detrimental distortion of ball,stem,or trunnion and where AYS4 =Actual Yield Strength of Ball MYS4 =Minimum Specified Yield Strength of Ball AYS5 =Average Yield Strength of Stem MYS5 =Minimum Specified Yield Strength of Stem AYS6 =Average Yield Strength of Trunnion MYS6 =Minimum Specified Yield Strength of Trunnion At the manufacturers option,as an alternate method for the 80 psig(6 Bar)gas test,the pressure may be applied inside the body cavity with the ball closed and both sides open for inspection.7.2.3 The duration of the seat test shall not be less than shown below.Valve Size Test Time Second NPS DN 2 and smaller 50 and smaller 152-8 65-200 3010-18 250-450 6020-36 500-900 120 Time duration is the period of inspection after the valve is fully prepared and under test pressure.7.2.4 There shall be no visible leakage past the seat for the duration of the test for valves with resilient(polymeric or elastomeric)seats.7.2.4.1 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.7.2.4.2 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 a leak detection fluid at the test pressure and for the duration of the test.7.2.4.3 For automatic leak detection methods,this definition shall be considered equivalent to a leak rate no greater than 4.1x10-5in3/sec(6.7x10-4ml/sec)with a pressure differential of 80 to 100 psi(5.5 to 6.9 bar)for application to valves NPS 8 and smaller.7.2.5 The maximum allowable leakage rate on each seat of non-resilient seated,except metal-seated,valves for the duration of the test shall be 2/10 of a standard cubic foot of gas per hour(6 liters per hour)per inch of nominal valve size or a maximum of 1.22 cubic inches(20 ml per hour)of hydrostatic media per hour per inch of nominal valve size,at the test pressure specified in 7.2.2.7.2.6 The maximum al