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1、MSS SP-I 31 -2004 Metallic Manually Operated Gas Distribution 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 www.mss- Fax: (703) 281-6671 e-mail: C
2、opyright MSS Provided by IHS under license with MSSLicensee=IHS Employees/1111111001, User=listmgr, listmgr Not for Resale, 03/06/2007 08:37:06 MSTNo reproduction or networking permitted without license from IHS -,-,- Copyright MSS Provided by IHS under license with MSSLicensee=IHS Employees/1111111
3、001, User=listmgr, listmgr Not for Resale, 03/06/2007 08:37:06 MSTNo reproduction or networking permitted without license from IHS -,-,- MSS STANDARD PRACTICE SP-131 This MSS Standard Practice was developed under the consensus of the MSS Technical Committee 501 and the MSS Coordinating Committee. Th
4、e 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,
5、 the user, and the general public. The existence of an MSS Standard Practice does not in itself preclude the manufac- ture, 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
6、, 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.) Non-toleranced dimensions in this Standard Practice are nomina
7、l, and, unless otherwise specified, shall be considered “for reference only”. Any part of this standard may be quoted. Credit lines should read extracted from MSS SP-131, 2004 with permission o f the publisher, the Manufacturers Standardization Society. Reproduction prohibited under copyright conven
8、tion unless written permission is granted by the Manufacturers Standardization Sociew o f the Valve and Fittings Industry, Inc. Originally Approved September, 2003 Copyright O, 2004 by Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. Printed in U.S.A. 1 Copyright MSS Pr
9、ovided by IHS under license with MSSLicensee=IHS Employees/1111111001, User=listmgr, listmgr Not for Resale, 03/06/2007 08:37:06 MSTNo reproduction or networking permitted without license from IHS -,-,- MSS STANDARD PRACTICE SP-131 TABLE OF CONTENTS SECTION PAGE PURPOSE . 1 SCOPE 1 DEFINITIONS or AS
10、TM A 395 or ASTM A 536 for ductile iron; or ASTM A 47 or ASTM A 197 for malleable iron. Plugging, weld- ing, impregnating or other repairing of any defects shall not be allowed for pressure containment cast- ings. 4.2.4 Copper Alloy Shall meet, as a minimum, the requirements of ASTM B 16 or ASTM B 5
11、84. Plug- ging, welding, brazing, impregnation, or other repair- ing of any defects shall not be allowed for pressure containment castings. 4.3 Forgings 4.3.1 Steel Forgings Shall be produced to the re- quirements of ASTM A 105. 4.3.2 Stainless Steel Forgings Shall be produced to the requirements of
12、 ASTM A 473. 4.3.3 Copper Alloy Forgings Shall be produced in accordance with ASTM B 124. 4.4 Fabricated & Machined Components Bodies and other pressure containment components shall be produced using sound manufacturing pro- cesses. Where components are fabricated by weld- ing, proper material carbo
13、n equivalence, approved welding specifications, and an approved welding pro- cess and procedure shall be used. Welders shall be qualified to API 1 104, as a minimum. 4.4.1 Carbon Steel Plates shall meet, as a mini- mum, the requirements of ASTM A 20. Pipe or tub- ing shall meet, as a minimum, the re
14、quirements of ASTMA 53 orA 5 13. Other steel shapes shall meet, as a minimum, the requirements of ASTM A 36. 4.4.2 Stainless Steel Plates and bars shall meet, as a minimum, the requirements of ASTM A 240 or ASTM A 479. 4.5 as a minimum, ASTM A 193 Grade B5. Cover or Bonnet Bolting Bolting shall meet
15、, 4.6 Seals, Gaskets, and Lubricants All materi- als used as seals or for lubrication shall be resistant to natural, LNG, and LP gases and other constituents in gas systems such as odorants, fogging oils, and alcohols. These materials shall be used in a manner to provide resistance to degradation fr
16、om flow forces and particulates in the gas stream. All elastomeric compounds shall meet the minimum requirements of ASTM D 2000. Valves which require pressure lu- brication by the injection of lubricant through fittings to the sealing surfaces of the valve shall be capable of being lubricated while
17、in both the full-open and the full-closed position while subjected to the maxi- mum operating pressure. 4.7 Valve Ends and Dimension Valve ends shall meet the following standards where applicable: 2 Copyright MSS Provided by IHS under license with MSSLicensee=IHS Employees/1111111001, User=listmgr,
18、listmgr Not for Resale, 03/06/2007 08:37:06 MSTNo reproduction or networking permitted without license from IHS -,-,- MSS STANDARD PRACTICE SP-131 4.7.1 Threaded, Flanged, & Welding Ends (a) Threaded End - ANSUASME B 1.20.1 or B 1.20.3 (b) Cast Iron Flanged End - ANSUASME B 16.1 (c) Cast Steel Flang
19、ed End - ANSVASME B16.5 (d) Cast Steel Weld End - ANSUASME B16.25 4.7.2 Compression End Connections 4.7.2.1 Non-restraining compression ends shall pro- vide gas sealing capability for the life of the product. 4.7.2.2 Sealing and restraining compression end con- nections shall be designed, constructe
20、d, and tested to ensure that the entire valve can provide the re- quired restraint and gas sealing capability in accor- dance with Section 4.7.2.1. The minimum require- ments of ASTM D 2513 shall be met for thermo- plastic piping applications. The minimum require- ments ofASTM D 25 17 shall be met f
21、or thermoset- ting plastics piping applications. 4.9 Configuration 4.9.1 Operating Indication Valves shall be marked or constructed so that the valve operator can visu- ally determine: (a) When a 1/4 t u r n valve is in the open or closed position. (b) When the valve is designed to provide operabil-
22、 ity of more than 90 degrees, the turning direction to open or close the valve and position indication of the closed position. 4.9.2 2” Square Operating Nut When specified, valves shall be supplied with a square operating nut in accordance with Figure 1. Valves may also be designed with slotted or a
23、djustable wrench type op- erators which will also accommodate a 2” square operating wrench. 4.1 O Marking 4.7.3 Face-to-Face and End-to-End Dimensions Face-to-Face and End-to-End dimensions shall be in accordance with the following standards where ap- plicable: (a) Ball Valves - MSS SP-72 (b) Butter
24、fly Valves - MSS SP-67 (c) Plug and Gate Valves - ANSUASME B16.10 (d) Weld End Valves - ANSUASME B16.34 4.7.4 Flange Surface Finish Flange surface finishes shall be in accordance with MSS SP-6 and the purchasers requirements. 4.7.5 Flange Spot Facing Spot facing of flanges, if required, shall be in
25、accordance with MSS SP-9. 4.8 Tamper-Proof Operation Where valves are specified to be tamper-proof, they shall have fea- tures which minimize the possibility of disassembly of pressure containing parts. 4.10.1 General Except as otherwise stated herein, valves shall be marked as required in MSS SP-25
26、 and shall include the following requirements. 4.1 O. 1.1 Name The manufacturers name or trade- mark shall be shown on the body, bonnet, or cover. 4.1 O. 1.2 Pressure Rating Marking for pressure rating shall be made on the body, stem, bonnet, or cover. 4.10.1.3 Body Material The designation of body
27、material shall be given unless physical size prohibits. Appropriate markings shall include the appropriate ASTM material designation where practical. 4.10.1.4 Tamper-Proof The designation “S, for tamper-proof construction where tamper-proof fea- tures are not easily identifiable without disassemblin
28、g the valve. 4.10.2 Marking of Steel Valves All steel valves shall be marked in accordance with API 6D require- ments. 3 Copyright MSS Provided by IHS under license with MSSLicensee=IHS Employees/1111111001, User=listmgr, listmgr Not for Resale, 03/06/2007 08:37:06 MSTNo reproduction or networking p
29、ermitted without license from IHS -,-,- MSS STANDARD PRACTICE SP-131 5. DESIGN OUALIFICATION REOUIRE- MENTS 5.1 General 5.5.1 Each size of a basic valve design shall be tested by randomly selecting 5 production valves from each pressure class and pressure shell material. 5.1.2 All tests, unless othe
30、rwise specified herein, shall be conducted at a temperature of 74OF 1 5 O F. 5.1.3 Before each test is conducted, each valve shall meet all engineering specifications, and shall be in- stalled per manufacturers installation instructions. control the flow of gas. Each valve shall be condi- tioned at
31、a temperature of -20 F 2 2 O F for a period of at least 16 hours. With each conditioned valve subjected to an internal pressure at least equal to the pressure rating, and the valve outlet safely vented to atmoshphere, it shall be operated to the fully opened and then fully closed position. Each valv
32、e shall then be conditioned at a temperature of 1 50 F 1 5 O F for a period of at least 16 hours. With each conditioned valve subjected to an internal pressure at least equal to the pressure rating, and the valve outlet safely vented to atmoshpere, it shall be operated to the fully opened and then f
33、ully closed postion. Each valve shall then be allowed to return to a temperature of 74OF k 1 5 O F and then meet the requirements of Sec- tion 6.2. 5.2 Pressure Tests 5.4 Operability 5.2.1 Each valve shall provide a shut-off when in the closed position and shall not leak to atmosphere in the open or
34、 closed position when subjected pro- gressively to internal air pressure of first 4 & 2 psig and then to at least 1.5 times the maximum allow- able pressure rating of the valve at 150 F. 5.2.2 With each valve in the opened position and the outlet plugged, the test pressure shall be applied to the in
35、let of each valve. Each valve shall be sub- merged in a bath of water at a temperature of 74OF kl 5 O F for a period of one (i) minute. Leakage, fi-om any point of the valve, as evidenced by the flow (breaking away) of bubbles shall not be permitted. Each valve shall then be turned to the closed pos
36、i- tion, outlet unplugged, and the test repeated. Bi-di- rectional valves shall be tested in both directions. The allowable leakage rate, through port or to atmosphere, for valves qualified to this Standard Practice is equiva- lent to 2.810- standard cubic cdsec air (this is based on the formation o
37、f a 1/8“ diameter bubble in 60 seconds). 5.2.2.1 Other means of leak detection such as pres- sure decay and mass spectrometry may be used pro- vided they are proven and documented to be equiva- lent in leak detection sensitivity and monitored on a regular basis for accuracy. MSS SP-61 contains furth
38、er information on valve testing. 5.3 Temperature Resistance Each valve shall be operable at temperatures ranging from -20“ F to 1 50F without affecting the capability of the valve to 4 5.4.1 Cycle Each valve shall be cycle tested using air, or a gas with a lower density than air, for 100 cycles thro
39、ugh its full range of operability with the maximum allowable operating pressure subjected to the valves inlet and the outlet open to atmosphere. A pressure source of large enough diameter and cycle time of long enough duration should be selected to ensure that the inlet pressure is at the maximum al
40、- lowable working pressure prior to opening. Each valve shall then meet the requirements of 5.2. Valves that require lubrication may be relubricated prior to testing to 5.2. 5.4.2 Maximum Operating Torque With each valve subjected to its maximum rated operating pres- sure the operating and breakaway
41、 torque values from open to closed position and then from closed to open position shall be less than the values specified in Table 1. The test shall be conducted at - 2 O O F & 2OF. 5.4.3 Minimum Operating Torque With all pres- sure containing components of each valve subjected to atmospheric pressu
42、re, the minimum turning torque shall be as specified in Table 2. The test shall be conducted at 70 F 2 2 O F. 5.4.4 Locking Features When specified valves shall be designed to be lockable in the closed posi- tion. 5.5 Structural Provisions Copyright MSS Provided by IHS under license with MSSLicensee
43、=IHS Employees/1111111001, User=listmgr, listmgr Not for Resale, 03/06/2007 08:37:06 MSTNo reproduction or networking permitted without license from IHS -,-,- SP-131 MSS STANDARD PRACTICE 5.5.1 Hydrostatic Test Strength Each valve in the partially open position with the outlet plugged shall withstan
44、d an internal hydrostatic pressure of at least 2 times the maximum allowable working pressure for a period of one minute without rupture or perma- nent deformation that would, after release of the pres- sure, render the valve inoperable. The test shall then be repeated for each valve in the closed p
45、osition in each direction of flow without rupture or permanent deformation that would, after release of the pres- sure, render the valve inoperable. 5.5.2 Bending Each valve shall be subjected to the bending test below: 5.5.2.1 Each valve shall be subjected to the bending moment specified in ANSI B1
46、6.33 paragraph 3.4.3 for valves 2” and smaller, or ANSI B16.38 para- graph 3.6 for larger valves. Two bending tests shall be conducted for a duration of 2 minutes with the valve in the half open position and pressurized to the maximum allowable working pressure. The first test shall be conducted wit
47、h the load applied in line with the stem having the over plate or bonnet positioned so it will be in tension. The second test shall be conducted with the load applied perpendicular to the stem. All leakage paths to atmosphere shall be soaked with soap water or leak detection fluid during the duratio
48、n of the tests. Visible leakage to atmosphere is not permitted. While subjected to the bending lead, the valve shall be operated through a full cycle from opened to closed. After the bending load is removed, there shall be no permanent deformation of the valve that would impair its operation or caus
49、e leakage through the valve or to atmosphere. 5.6 Flow Capacity The shape, size, and configura- tion of the flow passage in the fully open position shall provide, as a minimum, the flow capacity and head loss coefficients in accordance with Table 3. These qualification flow tests shall be conducted us- ing a pro