1、MSS SP-99-2016a 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 NOTICE:
2、This 2016a Edition Replaces the Original 2016 Edition. MSS STANDARD 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 expe
3、rienced volunteers to provide an effective, clear, and non-exclusive 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
4、 MSS Standard Practice does not in itself preclude the manufacture, 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 a
5、pplicable. MSS has no power, nor does it undertake, to enforce or 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 t
6、he statement. “Unless indicated otherwise within this MSS Standard 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 sh
7、all remain silent on the validity of those other standards of prior 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 c
8、onnection therewith. MSS shall not be held responsible for identifying 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, figure
9、s, and references are construed to be essential to the understanding 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
10、 include mandatory requirements. The SI (metric) units and U.S. customary units in this Standard Practice are regarded separately as the standard; each should be used independently of the other. Combining or converting values between the two systems may result in non-conformance with this Standard P
11、ractice. The U.S. customary units in this Standard Practice are the standard, in cases of conflict or incongruity. Substantive changes contained in this 2016a edition include those changes from the superseded 2016 edition. All substantive changes are “flagged” by parallel bars as shown on the margin
12、s of this paragraph. The specific detail of the 2016a changes may be determined by comparing the material flagged with that in the previous 2010 edition. Excerpts of this Standard Practice may be quoted with permission. Credit lines should read Extracted from MSS SP-99-2016a with permission of the p
13、ublisher, 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 Standardization Society of the Valve and Fittings Indust
14、ry Inc. All rights reserved. Originally Approved: July 1987 Originally Published: October 1987 Superseded 2016 Edition Published: November 2016 Current 2016a Edition Approved: May 2017 Current 2016a Edition Published: June 2017 MSS is a registered trademark of Manufacturers Standardization Society o
15、f the Valve and Fittings Industry, Inc. Copyright , 2017 by 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 . 2 4 DESIGN REQUIREMENTS . 3 5 QUALIFIC
16、ATION TESTS 6 6 ACCEPTANCE TESTING 7 7 MARKING . 7 TABLE 1 Applicable Material Specifications 2 FIGURE 1 Direct Mounted Instrument Manifold Gasket Groove and Flange Details U.S. Customary . 4 2 Direct Mounted Instrument Manifold Gasket Groove and Flange Details SI (Metric) . 5 ANNEX A Referenced Sta
17、ndards and Applicable Dates 8 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, and sampling piping systems. It covers steel and alloy valves of nominal pipe size
18、 (NPS) 2 and smaller, and pressure ratings of 15,000 psi (103.4 MPa) and lower at 100 F (38 C). See MSS SP-105 for instrument valves involving code applications. 1.2 This Standard Practice applies to instrument valve designs including, but not limited to, needle valves, packless valves, ball valves,
19、 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, size, rating, materials of cons
20、truction, 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 (38 C). This temperature is the temperature of the pressure-containing shell of the co
21、mponent. 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. 2. DEFINITIONS 2.1 Gene
22、ral Definitions given in MSS SP-96 apply to this Standard Practice. 2.2 Cold Working Pressure Rating (CWP) The maximum allowable working pressure of a valve at ambient conditions, i.e., -20 F to 100 F (-29 C to 38 C). 2.3 Control Piping Piping used to interconnect pneumatically or hydraulically oper
23、ated control apparatuses, or to signal control systems. 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
24、 Valve Two or more instrument valves 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 app
25、ly to all valve designs. a) Body 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 bound
26、ary parts of the valve shall be made 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
27、 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 properties. 3.4.1 The manufacturer
28、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 specifications listed in Table 1. 3.4.3 The m
29、aximum service temperature of leaded or resulfurized steels shall be as specified in the material specification or piping code, or 500 F (260 C), 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
30、 to 0.50 Carbon Forgings A108(c)Austenitic 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 r
31、elate 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 recognized bar material. MSS STANDARD PRACTICE SP-993 4. DESIGN
32、 REQUIREMENTS 4.1 Valves designed in accordance 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
33、 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 of each material, at the manufacturers option. 4.1.3 The CWP rati
34、ng 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 manufacturer at a value lower than the rating allowed by the qualific
35、ation 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 operating torque, cycle life, or non-metallic component limitation
36、s. 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 V-l 4.2.2 Pipe Socket Weld Connections The socket bore diameter
37、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 end preparation in accordance with ASME B16.25. 4.2.5 Butt weld c
38、onnections 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 according to the manufacturers standard. The standard stub extension lengths are ei
39、ther 3 inches (76.2 mm) or 6 inches (152.4 mm), 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 connections wel
40、ded to the valve body shall be in accordance with ASME Boiler and Pressure Vessel Code (BPVC), 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 stand
41、ard groove for gaskets and minimum flange or plate thickness shall be in accordance with Figure 1 (U.S. Customary) or Figure 2 (SIMetric), as applicable. 4.3.1 Other gasket groove dimensions may be employed but shall be considered special or optional (see Section 7.3). MSS STANDARD PRACTICE SP-994 D
42、imensions are in inches; Ra is in in GENERAL NOTE: The flange groove requires a surface finish having a concentric, circular lay that has a maximum roughness of 250 Ra and an overall maximum roughness of 125 Ra (in dimensional units included in figure). NOTE (a): See Section 4.3.1 for use of special
43、 or optional manifold gasket groove dimensions. FIGURE 1 Direct Mounted Instrument Manifold Gasket Groove and Flange Details U.S. CustomaryMSS STANDARD PRACTICE SP-995 Dimensions are in mm; Ra is in m GENERAL NOTE: The flange groove requires a surface finish having a concentric, circular lay that ha
44、s a maximum roughness of 6.3 Ra and an overall maximum roughness of 3.2 Ra (m dimensional units included in figure). NOTE (a): See Section 4.3.1 for use of special or optional manifold gasket groove dimensions. FIGURE 2 Direct Mounted Instrument Manifold Gasket Groove and Flange Details SI (Metric)
45、MSS STANDARD PRACTICE SP-996 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
46、 kept on file 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 tensil
47、e and yield 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 BPVC, Section VIII-1, Article UG-101 (J). 5.5 Proof Test Pro
48、cedure 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: 50 F to 125 F (10 C to 52 C) c) Pressure: Two times the CWP rating d) Time: One minute, minimum, at proof pressure e) Positio
49、n: Placed 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 adjustments 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 recorde
