1、MSS SP-99-2016 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 22180-4602 Phone: (703) 281-6613 Fax: (703) 281-6671 E-mail: standardsmsshq.org www.msshq.org MSS STAND
2、ARD PRACTICE 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 resulting efforts of competent and experienced volunteers to provide an effective, clear, and non-exclu
3、sive standard that will benefit the industry as a whole. This MSS Standard Practice describes minimal requirements and 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 manufactu
4、re, sale, or use of products not conforming to the Standard Practice. Mandatory conformance to this Standard Practice is established only by reference in other documents such as a code, specification, sales contract, or public law, as applicable. MSS has no power, nor does it undertake, to enforce o
5、r certify compliance with this document. Any certification or other statement of compliance with the requirements of this Standard Practice shall not be attributable to MSS and is solely the responsibility of the certifier or maker of the statement. “Unless indicated otherwise within this MSS Standa
6、rd Practice, other standards documents referenced to herein are identified by the date of issue that was applicable to this Standard Practice at the date of approval of this MSS Standard Practice (see Annex A). This Standard Practice shall remain silent on the validity of those other standards of pr
7、ior or subsequent dates of issue even though applicable provisions may not have changed.” By publication of this Standard Practice, no position is taken with respect to the validity of any potential claim(s) or of any patent rights in connection therewith. MSS shall not be held responsible for ident
8、ifying any patent rights. Users are expressly advised that determination of patent rights and the risk of infringement of such rights are entirely their responsibility. In this Standard Practice, all text, notes, annexes, tables, figures, and references are construed to be essential to the understan
9、ding of the message of the standard, and are considered normative unless indicated as “supplemental”. All appendices, if included, that appear in this document are construed as “supplemental”. Note that supplemental information does not include mandatory requirements. Substantive changes in this 201
10、6 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. Excerpts of this Standard Practice may be quoted with permission. Credit lines should read Extr
11、acted from MSS SP-99-2016 with permission of the publisher, Manufacturers Standardization Society of the Valve and Fittings Industry. Reproduction and/or electronic transmission or dissemination is prohibited under copyright convention unless written permission is granted by the Manufacturers Standa
12、rdization Society of the Valve and Fittings Industry Inc. All rights reserved. Originally Approved: July 1987 Originally Published: October 1987 Current Edition Approved: August 2016 Current Edition Published: November 2016 Copyright , 2016 by Manufacturers Standardization Society of the Valve and F
13、ittings 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 . 2 4 DESIGN REQUIREMENTS . 3 5 QUALIFICATION TESTS 5 6 ACCEPTANCE TESTING 6 7 MARKING . 6 TABLE 1 Applicable Material Specifications 2 FIGURE 1 Direct Moun
14、ted Instrument Manifold Gasket Groove and Flange Details 4 ANNEX A Referenced Standards and Applicable Dates 7 MSS STANDARD PRACTICE SP-991 INSTRUMENT VALVES 1. SCOPE 1.1 This Standard Practice applies to small valves and manifold valves developed for and predominantly used in instrument, control an
15、d sampling piping systems. It covers steel and alloy valves of nominal pipe size (NPS) 2 and smaller, and pressure ratings of 15,000 psi and lower at 100 F. 1.2 This Standard Practice applies to instrument valve designs including, but not limited to, needle valves, packless valves, ball valves, plug
16、 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, size, rating, materials of construct
17、ion, 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 100 F. This temperature is the temperature of the pressure-containing shell of the component. In
18、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. 2. DEFINITIONS 2.1 General Definiti
19、ons given in MSS SP-96 apply to this Standard Practice. 2.2 Control Piping Piping used to interconnect pneumatically or hydraulically operated control apparatuses, or to signal control systems. 2.3 Cold Working Pressure Rating (CWP) The maximum allowable working pressure of a valve at ambient condit
20、ions (-20 F to 100 F). 2.4 Instrument Piping Piping used to connect instruments to main piping or other instruments. 2.5 Instrument Valves Valves designed for use in instrument, control, and sampling piping systems, (e.g., see ASME B31.1, Article 122.3). 2.6 Manifold Valve Two or more instrument val
21、ves fabricated into a single valve body. 2.7 Packless Valve A valve with a diaphragm or bellows stem seal instead of a packing or O-ring seal at the stem. 2.8 Pressure Boundary Parts The following items are defined to be pressure boundary parts. Each item may not apply to all valve designs. a) Body
22、b) Bonnet c) Union Nut d) Body-to-Bonnet Bolting e) Body Bolting 2.9 Sampling Piping Piping used for the collection of samples (e.g., steam, water, oil, gas, and chemicals) from process systems. MSS STANDARD PRACTICE SP-992 3. MATERIALS 3.1 General The pressure boundary parts of the valve shall be m
23、ade of the materials specified herein. 3.2 Non-pressure boundary parts (e.g., 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. 3.3 The following materials are acceptable for use as pressu
24、re 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 properties. 3.4.1 The manufacturer shall specify minimum mechanical
25、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 specifications listed in Table 1. 3.4.3 The maximum service temperature of lea
26、ded or resulfurized steels shall be as specified in the material specification or piping code, or 500 F, whichever is less. TABLE 1 Applicable Material Specifications Material Form ASTM Specification Grade or Type Carbon Steel(a)Bars and Shapes A108 A576 0.08 to 0.50 Carbon Forgings A108(c)Austeniti
27、c Stainless Steel(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 utilized for any referenced standards that relate to conformity with this Standard Pr
28、actice. 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 recognized bar material. MSS STANDARD PRACTICE SP-993 4. DESIGN REQUIREMENTS 4.1 Valves designed in acco
29、rdance with this Standard Practice shall have CWP ratings established by hydrostatic proof and burst qualification tests, as specified in Section 5. 4.1.1 Hydrostatic qualification tests shall be conducted on each design and size of valve to establish the CWP rating. 4.1.2 The CWP rating of valves o
30、f 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 of each material, at the manufacturers option. 4.1.3 The CWP rating of valves of identical design and size
31、 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 manufacturer at a value lower than the rating allowed by the qualification tests of Section 5. In that case th
32、e 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 operating torque, cycle life, or non-metallic component limitations. 4.1.5 Packing nut adjustment may be ne
33、cessary 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 V-l 4.2.2 Pipe Socket Weld Connections The socket bore diameter and depth of socket shall be in accordanc
34、e 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 end preparation in accordance with ASME B16.25. 4.2.5 Butt weld connections for tube shall be in accordanc
35、e 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 according to the manufacturers standard. The standard stub extension lengths are either 3 inches or 6 inches, measured from
36、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 connections welded to the valve body shall be in accordance with ASME Boiler
37、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 standard groove for gaskets and minimum flange or plate thickness shall be
38、 as per Figure 1. Other groove dimensions shall be considered special. MSS STANDARD PRACTICE SP-994 Dimensions are in inches FIGURE 1 Direct Mounted Instrument Manifold Gasket Groove and Flange Details MSS STANDARD PRACTICE SP-995 5. QUALIFICATION TESTS 5.1 General Valve designs shall be qualified b
39、y 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 file by the manufacturer. 5.3 Test Valves Hydrostatic tests conducted on pre-production p
40、rototypes 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 strength of the pressure boundary parts of the test specimens shall be obtained from h
41、eat 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 Proof Test Procedure 5.5.1 Each test valve shall pass a hydrostatic shell proof test in
42、 accordance with the following minimum requirements: a) Fluid: Water or hydraulic oil b) Temperature: 50 F to 125 F c) Pressure: Two times the CWP rating d) Time: One minute, minimum, at proof pressure e) Position: Placed in all positions capable of subjecting pressure boundary components to interna
43、l 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 adjustments are permitted on any other pressure boundary joints or seals. 5.6 Burst Test P
44、rocedure 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 for the burst test. 5.6.2 Leakage is permitted at the valve packing, gaskets, and pres
45、sure 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 burst pressure for that valve. 5.7 Pressure Rating Determination The CWP rating shall be
46、 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 strength of the test specimen Tm = Specified minimum tensile strength of the material MSS S
47、TANDARD 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 method may be used. 6.1.1 Liquid tests shall meet the following minimum requirements: a)
48、 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: 50 F to 125 F d) Time: 15 seconds e) Acceptance Criteria: No visible leakage 6.1.2 Gas tests shall meet the follo
49、wing 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 when 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 in accordance with MSS SP-25 with at least
