1、MSS SP-105-2016 Instrument Valves for Code Applications 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
2、www.msshq.org MSS STANDARD PRACTICE SP-105i 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 effecti
3、ve, 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 MSS Standard Practice does not in itsel
4、f 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 applicable. MSS has no power, nor does it
5、 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 the statement. “Unless indicated otherwis
6、e 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 shall remain silent on the validity of tho
7、se 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 connection therewith. MSS shall not be he
8、ld 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, figures, and references are construed to be es
9、sential 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 include mandatory requirements. Substan
10、tive changes in this 2016 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. Credi
11、t lines should read Extracted from MSS SP-105-2016 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
12、 the Manufacturers Standardization Society of the Valve and Fittings Industry Inc. All rights reserved. Originally Approved: July 1990 Originally Published: October 1990 Current Edition Approved: August 2016 Current Edition Published: November 2016 Copyright , 2016 by Manufacturers Standardization S
13、ociety of the Valve and Fittings Industry, Inc. Printed in U.S.A. MSS STANDARD PRACTICE SP-105ii TABLE OF CONTENTS SECTION PAGE 1 SCOPE . 1 2 DEFINITIONS . 1 3 MATERIALS . 2 4 DESIGN REQUIREMENTS . 2 5 QUALIFICATION . 3 6 ACCEPTANCE TESTING 5 7 MARKING . 5 FIGURE 1 Direct Mounted Instrument Manifold
14、 Gasket Groove and Flange Details 6 ANNEX A Referenced Standards and Applicable Dates . 7 MSS STANDARD PRACTICE SP-1051 INSTRUMENT VALVES FOR CODE APPLICATIONS 1. SCOPE 1.1 This Standard Practice applies to small valves and manifold valves developed for and predominately used in instrument, control,
15、 and 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, p
16、lug 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 const
17、ruction, and suitability for the service are the responsibility of the purchaser and are outside the scope of this Standard Practice. 2. DEFINITIONS 2.1 General Definitions given in MSS SP-96 apply to this Standard Practice. 2.2 Cold Working Pressure Rating (CWP) The maximum allowable working pressu
18、re of a valve at ambient conditions (-20 F to 100 F). 2.3 Control Piping Piping used to interconnect pneumatically or hydraulically operated 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
19、 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 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
20、-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 b) Bonnet c) Union Nut d) Body to Bonnet Bolting e) Body Bolting 2.9 Sampling Piping Piping used for the collection of samples (suc
21、h as steam, water, oil, gas, and chemicals) from process systems. MSS STANDARD PRACTICE SP-1052 3. MATERIALS 3.1 General The pressure boundary 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 m
22、aterials 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 pressure boundary parts: a) Materials listed in ASME B16.34 b) Materials listed in ASME B31.1 c) Materials listed in ASME B31.3 d) Ma
23、terials listed in ASME Boiler and Pressure Vessel Code, Section II e) Materials listed in ASME B31.12 3.4 Certified material test reports shall be obtained for pressure boundary parts materials. Certifications shall include chemical analysis and mechanical properties. 4. DESIGN REQUIREMENTS 4.1 Valv
24、es designed in accordance with this Standard Practice shall have their working pressure established by calculation, hydrostatic proof and burst tests or both as specified in Section 5. 4.1.1 Qualification of valves designed to Section 4.1 shall be conducted on each design and size of valve to establ
25、ish 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 of each material, at the manufacturers option. 4.1.3 T
26、he 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 manufacturer at a value lower than the rating allowed by t
27、he 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 operating torque, cycle life, or non-metallic component
28、 limitations. 4.1.5 Packing nut adjustment may be necessary to compensate for temperature change. 4.1.6 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 general, this temperature is
29、 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. 4.2 End connections 4.2.1 Pipe Threads Tapered pipe threads sha
30、ll be in accordance with one of the following: a) ASME B1.20.1 b) ASME B1.20.3 c) CGA V-l MSS STANDARD PRACTICE SP-1053 4.2.2 Pipe Socket Weld Connections The socket bore diameter and the depth of socket shall be in accordance with the dimensions and tolerances of ASME B16.11. 4.2.3 Tube socket weld
31、 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 accordance with the manufacturers standard. 4.2.6 Pipe or tube stub extension end co
32、nnections 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 the end of the valve. 4.2.7 Mechanical tube fittings shall be in accordance
33、 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 and Pressure Vessel Code, Section IX. 4.2.9 Other end connections not liste
34、d 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 in accordance with Figure 1. Other groove dimensions shall be considered s
35、pecial. 5. QUALIFICATION 5.1 General Valve designs shall be qualified by calculation and hydrostatic proof or hydrostatic proof and burst tests at the option of the manufacturer. 5.2 Documentation 5.2.1 Hydrostatic proof and burst tests shall be conducted in accordance with the manufacturers written
36、 procedure. Copies of the test procedure and test reports shall be kept on file by the manufacturer. 5.2.2 Stress and pressure rating calculations shall be in accordance with the methods in this Standard Practice. Copies of the calculations shall be kept on file by the manufacturer. 5.3 Test Valves
37、Valves shall have their ratings confirmed by testing three (3) production valves by the method described in Section 5.5. 5.3.1 Similar valves of the same size and design, but having minor modifications, may also be considered qualified. Where those modifications would increase the level of stress in
38、 pressure boundary parts, the rating must be reduced proportionately to the ratio of the stresses. Stresses are to be calculated as specified in Section 5.8. If the materials have different strengths, the ratio of material allowable stresses shall also be used to determine the new rating. 5.4 Materi
39、al Properties The actual tensile 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 the ASME Boiler and Pressure Vesse
40、l Code, Section VIII-1, UG-101 (J). MSS STANDARD PRACTICE SP-1054 5.5 Proof Test Procedure 5.5.1 Each test valve shall pass a hydrostatic proof test in 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 ra
41、ting d) Time: One minute, minimum, at proof pressure e) Position: 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
42、 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
43、 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 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, t
44、he highest sustained pressure attained shall be considered the burst pressure for that valve. 5.7 Pressure Rating Determination When determined by the method of Section 5.6, 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:
45、 P = CWP Rating B = The lowest burst test pressure recorded for the three specimens tested Ta= Actual tensile strength of the test specimen Tm = Specified minimum tensile strength of the material 5.8 Calculations 5.8.1 Stress calculations shall be in accordance with ASME B31.1, ASME B31.3, or ASME B
46、oiler and Pressure Vessel Code, Section III, whichever is applicable. 5.8.1.1 No allowance for corrosion need be taken unless required by the user. Where corrosion will be present the manufacturer and user may agree to rate the valve based on the anticipated corrosion rate and required length of ser
47、vice. The user is responsible for monitoring the condition of the valves pressure boundary walls. MSS STANDARD PRACTICE SP-1055 5.8.2 Allowable stresses shall be in accordance with the Maximum Allowable Stress Tables in ASME B31.1, ASME B31.3, or ASME Boiler and Pressure Vessel Code, Section IID; wh
48、ichever is applicable. 5.8.3 The working pressure at a temperature other than the CWP is calculated by multiplying the CWP by the ratio of the allowable stress at the new temperature divided by the allowable stress at the CWP, although as stated in Section 4.1.4, performance limitations may further
49、restrict the working pressure at any given temperature. 6. ACCEPTANCE TESTING 6.1 Each production valve shall pass a seat leakage test and a shell test in accordance with MSS SP-61. 7. MARKING 7.1 Each valve shall be marked 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 shall be applied in accordance with MSS SP-25. MSS STANDARD PRACTICE SP-1056 Dimensions are in inches FIGURE 1 Direct Mo
