[www.staffempire.com]-MSS SP-136-2007 Ductile Iron Swing Check Valves.pdf

MSS SP-136-2007Standard 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 Ductile Iron Swing Check Valves Copyright MSS Provided by IHS under license with MSSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MSS STANDARD PRACTICE SP-136 iThis MSS Standard Practice was developed under the consensus of the MSS Technical Committee 106 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 C).Non-toleranced dimensions in this Standard Practice are nominal,and,unless otherwise specified,shall be considered“for reference only”.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 appearing in this document are construed as supplemental.Supplemental information does not include mandatory requirements.Any part of this standard may be quoted.Credit lines should read Extracted from MSS SP-136,2007 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,2007 Copyright,2007 by Manufacturers Standardization Society of the Valve and Fittings Industry,Inc.Printed in U.S.A.Copyright MSS Provided by IHS under license with MSSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-标准分享网 w w w.b z f x w.c o m 免费下载MSS STANDARD PRACTICE SP-136 iiTABLE OF CONTENTS SECTION PAGE 1 SCOPE.1 2 VALVE DESIGNATION,CLASSES AND SIZES.1 3 PRESSURE-TEMPERATURE RATINGS.2 4 MATERIALS.2 5 DESIGN.3 6 WORKMANSHIP.5 7 PRESSURE TESTING.5 8 MARKING.6 9 PAINTING.6 TABLE 1 Pressure-Temperature Ratings,ASTM A 395,Non-Shock psi.2 2 Pressure-Temperature Ratings,ASTM A 536 Non-Shock psi.3 3 Shell Test Pressure.6 4 Minimum Duration of Tests.6 B1 Pressure-Temperature Ratings,ASTM A 395,Non-Shock bar.8 B2 Pressure-Temperature Ratings,ASTM A 536,Non-Shock bar.8 FIGURE A1 Full-Waterway Metal to Metal Seat,Type I.7 A2 Full-Waterway Composition to Metal Seat,Type II.7 A3 Clear-Waterway Metal to Metal Seat,Type III.7 A4 Clear-Waterway Composition to Metal Seat,Type IV.7 ANNEX A Valve Types Figures A1 through A4.7 B Metric Units.8 C Referenced Standards and Applicable Dates.9 Copyright MSS Provided by IHS under license with MSSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MSS STANDARD PRACTICE SP-136 1DUCTILE IRON SWING CHECK VALVES 1.SCOPE 1.1 This Standard Practice establishes requirements for ductile iron swing check valves with flanged,threaded,mechanical-joint,and push-on ends for general purpose.This Standard Practice covers check valves for installation in pipelines that are horizontal or in pipelines where flow is above horizontal up to vertical with flow upward.1.2 This Standard Practice describes ductile iron check valves in two categories:1.2.1 Class rated valves,assigned a pressure and temperature rating as prescribed in an appropriate ASME standard.1.2.2 Valves limited to Cold Working Pressure(CWP)which are only limited to water service.1.3 This Standard Practice also includes,directly or by reference,requirements for chemical and physical properties of materials and pressure tests.2.VALVE DESIGNATION,CLASSES AND SIZES 2.1 Valve Types Valve types covered herein are illustrated in Figures A1 through A4 in Annex A.The valve sketches herein are for the purpose of illustration and nomenclature only.They are not intended to exclude any design meeting this Standard Practice.Swing check valves are classified in relation to the flow cross-sectional area or waterway as either Full-Waterway or Clear-Waterway and by the seating materials as either metallic or non-metallic.The waterway classifications are defined as:a)Full-Waterway valves shall have a flow cross-sectional area through the valves that is not less than the cross-sectional area of a circle having a diameter equal to the valve NPS expressed in inches.b)Clear-Waterway valves shall have an unobstructed cylindrical flow path through the valve.The diameter of the flow path shall be equal to the valve NPS expressed in inches.When the valve is in the open position,the disc shall swing completely clear of the waterway.c)The combinations of waterway and seating material classifications are designated by type as follows:Type I(Figure A1)Full-Waterway Metal to Metal Seats Type II(Figure A2)Full-Waterway Composition to Metal Seats Type III(Figure A3)Clear-Waterway Metal to Metal Seats Type IV(Figure A4)Clear-Waterway Composition to Metal Seats 2.2 Trim and Trim Combination Designations Valve seating-surfaces and operating-components shall be one of the following or a combination of the following:a)Copper Alloy b)Ferrous c)Stainless Steel d)Composition or Resilient Disc 2.3 Rating Designation Valves shall be in accordance with one of the following rating designations:a)ASME B16.1 Class 125 b)ASME B16.1 Class 250 c)ASME B16.42 Class 150 d)ASME B16.42 Class 300 e)MSS SP-128 250 CWP f)MSS SP-128 350 CWP Copyright MSS Provided by IHS under license with MSSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-标准分享网 w w w.b z f x w.c o m 免费下载MSS STANDARD PRACTICE SP-136 2 2.4 Nominal Pipe Sizes Nominal pipe sizes covered by this Standard Practice are:a)2 NPS 48,flanged end b)2 NPS 6,threaded end c)3 NPS 48,mechanical-joint end d)2 NPS 12,push-on end 3.PRESSURE-TEMPERATURE RATINGS 3.1 Pressure-temperature ratings designations are shown in Tables 1 and 2 in psi and degrees Fahrenheit units.Metric units(bar and degrees Celsius)are shown in Tables B1 and B2 in Annex B.The ratings are for valves with metal seating surfaces.Pressure-temperature ratings for valves with non-metallic seating materials must be limited to reflect the physical characteristics of these materials at each temperature,and may be lower but in no case higher than valves shown in Tables 1 and B1.3.1.1 Valves with cold working pressures(33 to 150 F)designated as CWP,shall have rated pressures of 250 or 350 psi.3.2 The pressure-temperature ratings shown in Table 1 shall apply for valves made from material conforming to ASTM A 395 and meeting the applicable requirements of ASME B16.42.3.3 The pressure-temperature ratings shown in Table 2 shall apply for valves made from material conforming to ASTM A 536 and meeting the applicable requirements of ASME B16.1.3.4 The temperature shown for the corresponding rating shall be the metal temperature of the pressure retaining parts.It shall be assumed that the metal temperature other than that of the contained fluid shall be the responsibility of the user.TABLE 1 Pressure-Temperature Ratings,ASTM A 395,Non-Shock psi ASME B16.42 Class 150 ASME B16.42 Class 300 Degrees F NPS 2 24 NPS 2 24 -20 to 100 250 640 200 235 600 300 215 565 400 200 525 500 170 495 600 140 465 650 125 450 Note:See Table B1 for metric units 4.MATERIALS 4.1 General This Standard Practice establishes physical and chemical requirements.Users are cautioned against applications with fluids which may react chemically with any materials used in these valves.Consultation with the manufacturer is advised to determine suitability in cases of doubt.4.1.1 Body and Cover The body and cover for valves designated as ASME B16.42 Class 150 or Class 300 shall be made of ductile iron in accordance with ASTM A 395.The body and cover for valves designated as 250 or 350 CWP or as ASME B16.1 Class 125 or Class 250 shall be of ductile iron in accordance with either ASTM A 395 or A 536.4.1.2 Seating Material a)Metal-to-metal seating surfaces shall be copper alloy for bronze trim valves,ductile iron or other ferrous material for all-iron trim valves,or stainless steel for stainless steel-trim valves.b)Facing material for composition or resilience shall be rubber(synthetic or natural),or suitable polymer.c)Other seating materials,either metal or composition,which are suitable for the intended service may be furnished when agreed upon by purchaser and manufacturer.Copyright MSS Provided by IHS under license with MSSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MSS STANDARD PRACTICE SP-136 34.1.3 Hinge Pins Hinge pins shall be wrought brass or stainless steel for bronze trim valves,wrought steel or stainless steel for all-iron valve trim,or wrought stainless steel for stainless steel trim valves.4.1.4 Hinge Non-ferrous hinges shall not be used on all-iron-trim valves.4.1.5 Side Plugs Side plugs,if used,shall be made of gray iron,malleable iron,ductile iron or steel.However,if used to support the hinge pin in bronze trim valves,they shall be of copper alloy or copper alloy bushed.4.1.6 Bolting Bolts and studs connecting pressure containing parts shall have minimum yield and ultimate strength properties not less than requirements of ASTM A 307.5.DESIGN 5.1 General The closure assembly shall be designed to assume the closed position by gravity under no flow conditions in a horizontal pipeline.Special arrangements of levers and springs or weights may be necessary to assure proper closure in lines which are inclined or vertical.5.1.1 Valves shall be designed to prevent distortion when subjected to test pressures in Section 7.5.1.2 Distortions are not acceptable that prevent the safe operation of valves when valves are under the test pressure specified in Section 7.5.2 Wall Thickness The minimum wall thickness for valve bodies and covers shall be as specified below:5.2.1 Pressure rated Class 150 and Class 300 check valves of ASTM A 395 ductile iron bodies shall have a minimum wall thickness as specified in ASME B16.42 for the corresponding Class and NPS fitting.The cover will have a minimum thickness of a blind flange per ASME B16.42 where the bolt circle is equal to or greater than the valve cover bolt circle.5.2.2 Pressure rated Class 125 and Class 250 check valves of ASTM A 536 ductile iron bodies shall have a minimum wall thickness as specified in ASME B16.1 for the corresponding Class and NPS fitting.The cover will have a minimum thickness of a blind flange per ASME B16.1 where the bolt circle is equal to or greater than the valve cover bolt circle.TABLE 2 Pressure-Temperature Ratings,ASTM A 536,Non-Shock psi Class 125 250 Temperature Degrees F NPS 2 12 NPS 14 24 NPS 2 12 NPS 14 24 -20 to 150 200 225 250 200 190 180 175 150 135 130 125 500 460 440 415 300 280 270 260 275 300 325 350 170 165 155 150 120 110 105 100 395 375 355 335 250 240 230 220 375 400 425 450 145 140 130 125-315 290 270 250 210 200-Note:See Table B2 for Metric Units Copyright MSS Provided by IHS under license with MSSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-标准分享网 w w w.b z f x w.c o m 免费下载MSS STANDARD PRACTICE SP-136 45.2.3 Valves with CWP designations shall have body and cover wall thicknesses in accordance with ASME B16.42 Class 150 wall thickness for 250 CWP or Class 300 wall thickness for 350 CWP.5.2.4 Additional metal thickness needed for assembly loads,shapes other than circular,stress concentrations,or other special circumstances,must be determined by individual manufacturers since these factors vary widely.5.3 End Connections 5.3.1 Flanged Ends 5.3.1.1 End flanges shall be integral with the valve body.Dimensions,tolerances,and drilling shall be in accordance with ASME/ANSI B16.42 for valves made of ASTM A 395 and ASME B16.1 for valves of ASTM A 536 material,for each respective pressure class.For CWP rated valves,end flanges shall be in accordance with ANSI/AWWA C110/A21.10 or ASME B16.1,at the manufacturers option.5.3.1.2 Unless otherwise specified by the applicable ASME B16.1,ASME B16.42,ANSI/AWWA C110/A21.10 or the purchaser,the flanges shall be fully machined on the joint side in accordance with MSS SP-6.5.3.1.3 Face-to-face dimensions of flanged end valves shall be as follows:5.3.1.3.1 Class 125,Class 150(ASTM A 536),or CWP,Full-Waterway,Figures A1 and A2,NPS 2 12;in accordance with ASME B16.10.5.3.1.3.2 Class 150(ASTM A 395),Full-Waterway,Figures A1 and A2,NPS 2 12,in accordance with ASME B16.10.5.3.1.3.3 Class 125,150 or CWP,Full-Waterway,Figures A1 and A2,NPS 14 48,per manufacturers specification.5.3.1.3.4 Class 125,150 or CWP,Clear-Waterway,Figures A3 and A4,NPS 2 24,per manufacturers specification.5.3.1.3.5 Class 300(ASTM A 395),Full-Waterway,Figure A1,NPS 2 12,in accordance with ASME B16.10.5.3.1.3.6 Class 250 or 300(ASTM A 536),Full-Waterway,Figure A1,NPS 2 12,in accordance with ASME B16.10.5.3.1.3.7 Class 250 or 300,Full-Waterway,Figure A1,NPS 14 48,per manufacturers specification.5.3.2 Threaded Ends Threaded end bodies may have hexagon,octagon,or round ends with ribs.Valve ends shall be threaded with taper pipe threads in accordance with ANSI/ASME B1.20.1.5.3.3 Mechanical-Joint Ends Mechanical-joint bell dimensions shall conform to ANSI/AWWA C111/A21.11.5.3.4 Push-On Joint Ends Push-on joints shall conform to the requirements of ANSI/AWWA C111/A21.11.5.4 Body-Cover Bolting 5.4.1 Dimensions of bolts and cap screws shall be in accordance with ASME B18.2.1;nut dimensions in accordance with ANSI/AWWA B18.2.2.5.4.2 Nuts shall be threaded in accordance with ASME B1.1,Coarse Threaded Series,Class 2B.5.4.3 Bolts,studs or cap screws shall be threaded in accordance with ANSI B1.1,Coarse Thread Series,Class 2A.Copyright MSS Provided by IHS under license with MSSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MSS STANDARD PRACTICE SP-136 5c)The test shall be made using water,which may have a corrosion inhibitor,with kerosene,or other suitable fluids(gas or liquid),provided such fluid has a viscosity not greater than that of water.d)The test fluid temperature shall not exceed 125 F(50 C).e)The shell test duration,the test period of inspection after the valve is fully prepared and is under full pressure,shall be not less tha