1、 MSS SP-99-2010 Instrument 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 PRA
2、CTICE SP-99i This MSS Standard Practice was developed under the consensus of the MSS Technical Committee 115 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
3、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 co
4、nforming 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 Standard Practice, other standards referred to herein are identified by the date of issue
5、 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. Reference
6、s contained herein which are bibliographic in nature are noted as supplemental in the text.” 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 t
7、hat in the previous edition. Any part of this Standard Practice may be quoted. Credit lines should read Extracted from MSS SP-99-2010 with permission of the publisher, Manufacturers Standardization Society of the Valves and Fittings Industry, Inc. Reproduction is prohibited under copyright conventio
8、n unless written permission is granted by Manufacturers Standardization Society of the Valve and Fittings Industry Inc. Originally Approved: July 1987 Originally Published: October 1987 Current Edition Approved: May 2010 Current Edition Published: September 2010 Copyright , 1987, 1989, 1994, 2010 by
9、 Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. Printed in U.S.A. MSS STANDARD PRACTICE SP-99ii TABLE OF CONTENTS SECTION PAGE 1 SCOPE . 1 2 DEFINITIONS 1 3 MATERIALS 1 4 DESIGN REQUIREMENTS . 3 5 QUALIFICATION TESTS . 5 6 ACCEPTANCE TESTING . 6 7 MARKING 6 TABLE 1 Ap
10、plicable Material Specifications 2 FIGURE 1 Direct Mounted Instrument Manifold Gasket Groove and Flange Details 4 ANNEX A Referenced Standards and Applicable Dates . 8 MSS STANDARD PRACTICE SP-991 1. SCOPE 1.1 This Standard Practice applies to small valves and manifold valves developed for and predo
11、minantly used in instrument, control and sampling piping systems. It covers steel and alloy valves of nominal pipe size (NPS) 1 and smaller, and pressure ratings of 15,000 psi and lower at 100F. 1.2 This Standard Practice applies to instrument valve designs including, but not limited to, needle valv
12、es, packless valves, ball valves, plug valves, check valves and manifold valves. Instrument valves are generally of proprietary design; this Standard Practice is not intended to define or limit designs, construction, performance, envelope dimensions, or valve types. 1.3 The application of valve type
13、, size, rating, materials of construction, and suitability for the service is the responsibility of the purchaser and is outside the scope of this Standard Practice. 1.4 The manufacturer shall provide pressure ratings for temperatures above 100F. This temperature is the temperature of the pressure-c
14、ontaining shell of the component. In general, this temperature is the same as that of the contained fluid. Use of a pressure rating corresponding to a temperature other than that of the contained fluid is the responsibility of the user, subject to the requirements of applicable codes and regulations
15、. 2. DEFINITIONS 2.1 General Definitions given in MSS SP-96 apply to this Standard Practice. 2.2 Instrument Valves Valves designed for use in instrument, control, and sampling piping systems, (e.g., see ASME B31.1, Article 122.3). 2.3 Instrument Piping Piping used to connect instruments to main pipi
16、ng or other instruments. 2.4 Control Piping Piping used to interconnect pneumatically or hydraulically operated control apparatuses, or to signal control systems. 2.5 Sampling Piping Piping used for the collection of samples (such as steam, water, oil, gas, and chemicals) from process systems. 2.6 M
17、anifold Valve Two or more instrument valves fabricated into a single valve body. 2.7 Cold Working Pressure Rating The maximum allowable working pressure of a valve at ambient conditions (-20F to 100F), abbreviated CWP. 2.8 Pressure Boundary Parts The following items are defined to be pressure bounda
18、ry parts. Each item may not apply to all valve designs. a) Body b) Bonnet c) Union Nut d) Body to Bonnet Bolting e) Body Bolting 2.9 Packless Valve A valve with a diaphragm or bellows stem seal instead of a packing or O-ring seal at the stem. 3. MATERIALS 3.1 General The pressure boundary parts of t
19、he valve shall be made of the materials specified herein. 3.2 Non-pressure boundary parts (such as the stem, glands, packing nut) shall be made of materials compatible with the pressure boundary parts materials. For compression packing systems, see MSS SP-132. INSTRUMENT VALVES MSS STANDARD PRACTICE
20、 SP-992 3.3 The following materials are acceptable for use as pressure boundary parts. a) Materials listed in ASME B16.34 b) Materials listed in Table 1 3.4 Material certifications shall be obtained for pressure boundary parts materials. Certifications shall include chemical analysis and mechanical
21、properties. 3.4.1 The manufacturer shall specify minimum mechanical properties for materials ordered to specifications which do not include mechanical properties. 3.4.2 The manufacturer may specify minimum properties which are higher than those required by the ASME B16.34 specification or specificat
22、ions listed in Table 1. 3.4.3 The maximum service temperature of leaded or resulfurized steels shall be as specified in the material specification or piping code, or 500F, whichever is less. TABLE 1 Applicable Material Specifications MATERIAL FORM ASTM SPECIFICATION GRADE OR TYPE Carbon Steel Note (
23、a)Bars and Shapes A108 A576 0.08 to 0.50 Carbon Forgings A108 Note (c)Austenitic Stainless Steel Note (b)Forging Bars A314 303 304, 304L 316, 316L Bars and Shapes A581 A582 303 A276 A580 304, 304L 316, 316 L GENERAL NOTE: U.S. customary units in this Standard Practice are the standard and should be
24、utilized for any referenced standards that relate to conformity with this Standard Practice. NOTES: (a) Leaded or resulfurized grades shall not be used where welding is required. (b) Type 303 shall not be used where welding is required. (c) Forgings may be produced from ASTM A108, a recognized bar m
25、aterial. MSS STANDARD PRACTICE SP-993 4. DESIGN REQUIREMENTS 4.1 Valves designed in accordance with this Standard Practice shall have cold working pressure ratings established by hydrostatic proof and burst qualification tests, as specified in Section 5. 4.1.1 Hydrostatic qualification tests shall b
26、e conducted on each design and size of valve to establish the CWP rating. 4.1.2 The CWP rating of valves of identical design and size but made of different materials shall be proportional to the allowable stress of each material or may be determined by hydrostatic qualification tests on valves made
27、of each material, at the manufacturers option. 4.1.3 The CWP rating of valves of identical design and size but with different end connections shall be determined by the rating of the valve or the end connection, whichever is less. 4.1.4 The CWP rating of a valve design may be established by the manu
28、facturer at a value lower than the rating allowed by the qualification tests of Section 5. In that case the lower pressure rating may be established for a valve design and size, regardless of materials or end connections. Such reduced ratings are usually dictated by performance limitations such as o
29、perating torque, cycle life, or non-metallic component limitations. 4.1.5 Packing nut adjustment may be necessary to compensate for temperature change. 4.2 End Connections 4.2.1 Pipe Threads Tapered pipe threads shall be in accordance with one of the following: a) ASME Bl.20.1 b) ASME B1.20.3 c) CGA
30、 V-l 4.2.2 Pipe Socket Weld Connections The socket bore diameter and depth of socket shall be in accordance with the dimensions and tolerances of ASME B16.11. 4.2.3 Tube socket weld dimensions shall be in accordance with the manufacturers standard. 4.2.4 Butt weld connections for pipe shall have an
31、end preparation in accordance with ASME B16.25. 4.2.5 Butt weld connections for tube shall be in accordance with the manufacturers standard. 4.2.6 Pipe or tube stub extension end connections may be socket welded or butt welded to the valve. The diameter and wall thickness shall be the manufacturers
32、standard. The standard stub extension lengths are 3” or 6”, measured from the end of the valve. 4.2.7 Mechanical tube fittings shall be in accordance with the manufacturers design. Fittings may be machined integral with, welded to, or threaded to the valve body. 4.2.8 Weld qualifications for end con
33、nections welded to the valve body shall be in accordance with ASME Boiler and Pressure Vessel Code, Section IX. 4.2.9 Other end connections not listed herein may be provided as agreed upon by the manufacturer and purchaser. 4.3 Direct Mounted Instrument Manifold Gasket Groove and Flange Details The
34、standard groove for gaskets and minimum flange or plate thickness shall be per Figure 1. Other groove dimensions shall be considered special. MSS STANDARD PRACTICE SP-994 GENERAL NOTE: Dimensions are in inches. FIGURE 1 Direct Mounted Instrument Manifold Gasket Groove and Flange Details MSS STANDARD
35、 PRACTICE SP-995 5. QUALIFICATION TESTS 5.1 General Valve designs shall be qualified by hydrostatic proof and burst tests. 5.2 Documentation Hydrostatic tests shall be conducted in accordance with the manufacturers written procedure. Copies of the test procedure and test reports shall be kept on fil
36、e by the manufacturer. 5.3 Test Valves Hydrostatic tests conducted on pre-production prototypes shall be confirmed by tests on at least three production valves. The CWP shall be based on the lowest test pressure result of the three valves tested. 5.4 Material Properties The actual tensile and yield
37、strength of the pressure boundary parts of the test specimens shall be obtained from heat traceable material certifications or by submitting sample material from the same lot to testing in accordance with the procedures of ASME Boiler and Pressure Vessel Code, Section VIII, Article UG-101 (J). 5.5 P
38、roof Test Procedure 5.5.1 Each test valve shall pass a hydrostatic shell proof test in accordance with the following minimum requirements: a) Fluid: Water or hydraulic oil b) Temperature: 50F to 125F c) Pressure: Two times the CWP rating d) Time: One minute, minimum, at proof pressure e) Position: P
39、laced in all positions capable of subjecting pressure boundary components to internal pressure 5.5.2 There shall be no visible leakage during the proof test at, any pressure containing part, joint, or seal. 5.5.3 The stem packing may be adjusted during the proof test to stop leakage. No other adjust
40、ments are permitted on any other pressure boundary joints or seals. 5.6 Burst Test Procedure 5.6.1 Each test valve shall be hydrostatically shell tested to failure by rupture. The hydrostatic pressure at which rupture occurs shall be recorded. The same valves used for the proof test shall be used fo
41、r the burst test. 5.6.2 Leakage is permitted at the valve packing, gaskets, and pressure retaining joints during the burst test, at pressures above the proof pressure. 5.6.3 If the hydrostatic test is stopped before rupture occurs, the highest sustained pressure attained shall be considered the burs
42、t pressure for that valve. 5.7 Pressure Rating Determination The CWP rating shall be less than or equal to the pressure determined from the burst pressure as follows: P 0.25 B Tm/TaWhere: P = CWP Rating B = The lowest burst test pressure recorded for three specimens tested Ta= Actual tensile strengt
43、h of the test specimen Tm = Specified minimum tensile strength of the material MSS STANDARD PRACTICE SP-996 6. ACCEPTANCE TESTING Each production valve shall pass a seat leakage test and a shell test. 6.1 The standard test methods shall be the liquid or gas test methods described herein. Either meth
44、od may be used. 6.1.1 Liquid tests shall meet the following minimum requirements: a) Fluid: Water or other liquid of similar or lower viscosity b) Pressure: 1.1 times the CWP Rating minimum for seat tests; 1.5 times the CWP Rating minimum for shell tests c) Temperature: 50F to 125F d) Time: 15 secon
45、ds e) Acceptance Criteria: No visible leakage 6.1.2 Gas tests shall meet the following minimum requirements: a) Gas: Air, nitrogen, or other gas of similar or lower viscosity b) Pressure: 80 psi, minimum, for both shell and seat tests c) Time: 15 seconds d) Acceptance Criteria: No visible leakage wh
46、en immersed in water or coated with a leak detection solution 6.2 Alternative Test Methods: Other leakage test methods may be used provided that the manufacturer demonstrates they are equal in sensitivity to the standard liquid or gas tests specified herein. 7. MARKING 7.1 Each valve shall be marked
47、 in accordance with MSS SP-25 with at least the following: a) Manufacturers identification b) Flow direction (if applicable) c) Manufacturers model number d) Material grade (unless coded in model number) 7.2 Additional markings may be applied in accordance with MSS SP-25. MSS STANDARD PRACTICE SP-99
48、7 ANNEX 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 Description ASME; ANSI/ASME B1.20.1-1983 (R2006) Pipe Threads, General Purpose, Inch B1.20.3-1976 (R2008) Dryseal Pipe Threads
49、, Inch B16.11-2009 Forged Fittings, Socket-Welding and Threaded B16.25-2007 Buttwelding Ends B16.34-2009 Valves Flanged, Threaded and Welding End B31.1-2007 Power Piping BPVC-VIII, Div.1-2007 Boiler and Pressure Vessel Code, Section VIII, Division 1, Rules for Construction of Pressure Vessels BPVC-IX-2007 Boiler and Pressure Vessel Code, Section IX, Welding and Brazing Qualifications ASTM Standard Specification for: A108-07 Steel Bar, Carbon and Alloy, Cold-Finished A276-08a Stainless Steel Bars and Shapes A314-08 Stainless Steel Billets and Bars for Forging A576-90b
