1、MSS SP-105-2016a 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 NOTICE: This 2016a Edition Replaces the Original 2016 Edition. 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 effor
3、ts of competent and experienced 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 pub
4、lic. The existence of an 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 contr
5、act, or public law, as applicable. 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
6、 certifier or maker of the 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). T
7、his Standard Practice shall 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 o
8、f any patent rights in connection 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,
9、 annexes, tables, figures, 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 supplemen
10、tal information does not 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-conforma
11、nce with this Standard Practice. 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 bar
12、s as shown on the margins 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-105-2016a
13、 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 Standardization Society of the
14、Valve and Fittings Industry Inc. All rights reserved. Originally Approved: July 1990 Originally Published: October 1990 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
15、Standardization Society of 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-105ii TABLE OF CONTENTS SECTION PAGE 1 SCOPE . 1 2 DEFINITIONS . 1 3 MATERIALS . 2 4 DESIGN R
16、EQUIREMENTS . 2 5 QUALIFICATION TESTS 3 6 ACCEPTANCE TESTING 5 7 MARKING . 5 FIGURE 1 Direct Mounted Instrument Manifold Gasket Groove and Flange Details U.S. Customary . 6 2 Direct Mounted Instrument Manifold Gasket Groove and Flange Details SI (Metric) 7 ANNEX A Referenced Standards and Applicable
17、 Dates 8 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, and sampling piping systems for code applications. It covers steel and alloy val
18、ves of nominal pipe size (NPS) 2 and smaller, and pressure ratings of 15,000 psi (103.4 MPa) and lower at 100 F (38 C). See MSS SP-99 for instrument valves not involving code applications. 1.2 This Standard Practice applies to instrument valve designs including, but not limited to, needle valves, pa
19、ckless 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, siz
20、e, rating, materials of construction, 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 max
21、imum 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 operated control apparatuses, or to signal control systems. 2.4 Instrument Piping Piping used to connect instruments t
22、o 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 valves fabricated into a single valve body. 2.7 Packless Valve A valve with a diaphr
23、agm 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 b) Bonnet c) Union Nut d) Body-to-Bonnet Bolting e) Body Bolting 2.9 Sampling Pip
24、ing Piping used for the collection of samples (such 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.,
25、 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 pressure boundary parts: a) Materials listed in ASME B16.34 b) Materials listed in
26、ASME B31.1 c) Materials listed in ASME B31.3 d) Materials listed in ASME Boiler and Pressure Vessel Code (BPVC), 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 a
27、nd mechanical properties. 4. DESIGN REQUIREMENTS 4.1 Valves 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 shal
28、l be 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 ma
29、de 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 m
30、anufacturer 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 a
31、s operating torque, cycle life, or non-metallic component 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 (38 C). This temperature is the temperature of the pressure co
32、ntaining 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.
33、 4.2 End connections 4.2.1 Pipe Threads Tapered pipe threads shall 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
34、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 accordance with the
35、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 the end of
36、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 BPVC, Section IX.
37、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 in accordance with Figure 1 (U.S. Cus
38、tomary) 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). 5. QUALIFICATION TESTS 5.1 General Valve designs shall be qualified by calculation and hydrostatic proof or hydrostatic proof and burst t
39、ests 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 procedure. Copies of the test procedure and test reports shall be kept on file by the manufacturer. 5.2.2 Stress and pressure rating calcu
40、lations 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 Valves shall have their ratings confirmed by testing three (3) production valves by the method described in Section 5.5. 5.3.1 Similar valv
41、es 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 pressure boundary parts, the rating must be reduced proportionately to the ratio of the stresses. Stresses are to be calculated as specifi
42、ed 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 Material Properties The actual tensile and yield strength of the pressure boundary parts of the test specimens shall be obtained from heat tracea
43、ble material certifications or by submitting sample material from the same lot to testing in accordance with the procedures of the ASME BPVC, 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 wit
44、h 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) Position: Placed in all positions capable of subjecting pressure boundary components to interna
45、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
46、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
47、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 When determined by the
48、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: P = CWP Rating B = The lowest burst test pressure recorded for the three specimens tested Ta = Actual tensile strength of the test specimen Tm = Speci
49、fied 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 BPVC, Section III, Division 1; 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 service. The user is responsible for monitoring the condition of the valves pressure boundary walls. MSS STANDARD PRACTICE SP-1055
