1、ANSI/MSS SP-134-2012 Valves for Cryogenic Service, including Requirements for Body/Bonnet Extensions 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 Fa
2、x: (703) 281-6671 E-mail: standardsmss-hq.org www.mss-hq.org MSS STANDARD PRACTICE SP-134i This MSS Standard Practice was developed under the consensus of the MSS Technical Committee 114 and the MSS Coordinating Committee. In addition, this Standard Practice was approved by an ANSI/MSS Consensus Com
3、mittee and ANSI as an American National Standard. The content of this Standard Practice is the resulting efforts 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
4、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 manufacture, sale, or use of products not conforming to the Standard Practice. Mandatory conformance to this St
5、andard 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 or certify compliance with this document. Any certification or other statement of compliance with the r
6、equirements 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 Standard Practice, other standards documents referenced to herein are identified by the date of issue that w
7、as applicable to this Standard Practice at the date of approval of this MSS Standard Practice (see Annex B). This 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 publicati
8、on 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 identifying any patent rights. Users are expressly advised that determination of patent rights and the risk
9、 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 understanding of the message of the standard, and are considered normative unless indicated as “supplemental”.
10、All appendices, if included, that appear in this document are construed as “supplemental”. Note that supplemental information does not include mandatory requirements. U.S. customary units in this Standard Practice are the standard; (SI) metric units are for reference only. This document has been sub
11、stantially revised from the previous 2010 edition. It is suggested that if the user is interested in knowing what changes have been made, that direct page by page comparison should be made of this document and that of the previous edition. Non-toleranced dimensions in this Standard Practice are nomi
12、nal and, unless otherwise specified, shall be considered “for reference only”. Excerpts of this Standard Practice may be quoted with permission. Credit lines should read Extracted from ANSI/MSS SP-134-2012 with permission of the publisher, Manufacturers Standardization Society of the Valve and Fitti
13、ngs 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 Industry Inc. All rights reserved. Originally Approved: February 2005 Origin
14、ally Published: July 2006 Current Edition Approved: December 2011 Current Edition Published: May 2012 Current ANSI/MSS Edition Approved by ANSI: October 2015 Current ANSI/MSS Edition Published: October 2015 MSS is a registered trademark of Manufacturers Standardization Society of the Valve and Fitti
15、ngs Industry, Inc. Copyright 2012, 2015 by Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. Printed in U.S.A. MSS STANDARD PRACTICE SP-134ii TABLE OF CONTENTS SECTION PAGE 1 SCOPE . 1 2 DEFINITIONS 1 3 CLASS/SIZE DESIGNATION . 2 4 MATERIALS 2 5 DESIGN 2 6 GATE AND GLOBE
16、 VALVES 3 7 BALL including the following identified in this Standard Practice as a parent standard: ASME B16.34, Valves Flanged, Threaded, and Welding End API 600, Steel Gate Valves Flanged and Butt-welding Ends, Bolted Bonnets API 602, Steel Gate, Globe, and Check Valves for Sizes NPS 4 (DN 100) an
17、d Smaller for the Petroleum and Natural Gas Industries API 603, Corrosion-resistant, Bolted Bonnet Gate Valves Flanged and Butt-welding Ends API 608, Metal Ball Valves Flanged, Threaded and Welding Ends API 609, Butterfly Valves: Double Flanged, Lug- and Wafer-type API 6D, Specification for Pipeline
18、 Valves (identical to ISO 14313) 1.2 The requirements in this Standard Practice are not intended to supersede or replace requirements of a parent valve standard. 1.3 This Standard Practice includes additional construction detail requirements specifically related to valves, including body/bonnet exte
19、nsions essential for cryogenic applications. 2. DEFINITIONS 2.1 General Definitions given in MSS SP-96 apply to this Standard Practice. 2.2 Cryogenics The science of materials at extremely low temperatures. 2.3 Cryogenic Fluid A gas that can be changed to a liquid by removal of heat by refrigeration
20、 methods to a temperature at -100 F (-73 C) or lower. 2.4 Cryogenic Temperature For this Standard Practice a temperature range of -100F (-73 C) to -425 F (-254 C) is cryogenic. 2.5 Cold Box An enclosure that insulates a set of equipment from the environment without the need for insulation of the ind
21、ividual components inside the cold box. 2.6 Cold Box Extension A valve body/bonnet extension section that removes the operating mechanism of the valve outside the cold box and is required to be longer than a non-cold box extension. 2.7 Non-Cold Box Extension A body/bonnet extension that is used for
22、valves that are normally individually insulated. 2.8 Parent Valve Standard Endorses the ASME B16.34 construction requirements but has additional construction detail requirements exceeding or not addressed by ASME B16.34. 2.9 Gas Column That portion of body/bonnet extension that allows for the format
23、ion of an insulating column of vapor. 2.10 Double Block and Bleed Valve Valve with two seating surfaces that when in the closed position, blocks flow from both valve ends when the cavity between the seating surfaces is vented through a bleed connection provided in the valve body. VALVES FOR CRYOGENI
24、C SERVICE, INCLUDING REQUIREMENTS FOR BODY/BONNET EXTENSIONS MSS STANDARD PRACTICE SP-1342 3. CLASS/SIZE DESIGNATION 3.1 Pressure Rating Designation Class, followed by a dimensional number, is the designation for pressure-temperature ratings. Standardized designations are as follows: Class 150 300 4
25、00 600 900 1500 2500 4500 3.2 Size NPS indicates “Nominal Pipe Size” (U.S customary). A standard size identification number, not necessarily an actual dimension. The (SI) metric-based equivalent is called DN or Nominal Diameter/“diametre nominel“. NPS is related to the reference DN (used in many int
26、ernational standards). The typical relationship is as follows: NPS DN 1/4 8 3/8 10 1/2 15 3/4 20 1 25 11/4 32 11/2 402 50 21/2 65 3 80 4 100 For NPS 4, the related DN = 25 multiplied by the NPS number. 4. MATERIALS 4.1 Materials in contact with cryogenic fluid or exposed to cryogenic temperatures sh
27、all be suitable for use at the minimum temperature specified by the purchase order. ASME B31.3, Table A1 lists mechanical properties for materials at temperatures as low as -425 F (-254 C). 4.2 Body, bonnet, body/bonnet extension, and pressure retaining bolting shall be of materials listed in ASME B
28、 16.34, Table 1 and also listed in ASME B31.3, Table A1 for the cryogenic valve design temperature. The body/bonnet extension shall be constructed of the same ASME B16.34 Table 1 group material as the valve body group material or a similar ASME B16.34 group material with the same cryogenic material
29、compatibility as the valve body. 4.3 Unless otherwise specified in the purchase order internal wetted parts shall be made of a material that is suitable for the specified cryogenic temperature and has a corrosion resistance that is comparable with the body material. 4.4 Packing and gasket materials
30、in direct contact with the service fluid shall be capable of operating at temperatures from +150 F (+65 C) to the lowest cryogenic temperature of the service fluid specified in the purchase order. 4.5 When pipe or non-standard wall tube material is used for constructing body/bonnet extensions, the m
31、aterial shall be seamless. 5. DESIGN 5.1 The requirements of ASME B16.34, Section 2.1.6, shall be met for weld fabricated body/bonnet extensions. 5.2 Valves shall have a body/bonnet extension integrally cast/forged or consisting of a pipe or non-standard wall tube that distances the stem packing and
32、 valve operating mechanism from the cryogenic fluid in the valve body/bonnet extension that might otherwise damage or impair the function of these items. The body/bonnet extension shall be of sufficient length to provide an insulating gas column that prevents the packing area and operating mechanism
33、 from freezing. Check valves do not require extensions except when they are designed for stop-check service. Stop check valve extensions shall follow this Standard Practice rules for cryogenic globe valves. The purchaser shall provide the body/bonnet extension length when Table 1 or Table 2 extensio
34、n lengths are not adequate. MSS STANDARD PRACTICE SP-1343 5.2.1 The cast/forged extension, pipe or non-standard wall tube thickness shall take into account pressure stresses as well as operating torque, stem thrust and bending stresses induced by handwheels, gears and power actuators. 5.2.2 The body
35、/bonnet extension shall meet the minimum wall thickness requirements of ASME B16.34, Section 6.1.3, for the applicable pressure class of the valve body unless a greater wall thickness is specified by the parent valve specification. If the body/bonnet extension is made from a different ASME B16.34, T
36、able 1, material than the valve body and has an ASME B16.34 pressure-temperature rating less than the valve body, then the extension thickness must be increased proportionately to meet the pressure-temperature rating of the body at all applicable temperatures. 5.3 Valves shall be designed for operat
37、ing at temperatures from +150 F (+65 C) to the lowest cryogenic temperature of the service fluid. 5.4 The pressure rating of the valve at service temperatures below -20 F (-29 C) shall not exceed the ASME B16.34 pressure rating at -20 F (-29 C) to 100 F (38 C) for the applicable valve body material
38、and appropriate Class designation. 5.5 Body/Bonnet Extensions 5.5.1 Body/Bonnet Extensions should be used primarily for temperatures colder than -100F (-73C). When specified by the purchaser this Standard Practice may also be used for valves with body/bonnet extensions for low temperature applicatio
39、ns for temperatures warmer than -100 F (-73 C). 5.5.2 Stem to extension tube diametrical clearance should be minimized to help reduce convective heat losses. 5.5.3 For cold box applications, valves with extended body/bonnets shall be capable of operating with the stem oriented from 150to 900above th
40、e horizontal plane. 5.5.4 Valves with extended body/bonnets in cryogenic gas service shall be capable of operating in any stem orientation unless otherwise limited by the manufacturer. 5.6 Valve Stems The design of globe, gate, and quarter-turn valves having extended stem lengths, as required by thi
41、s Standard Practice, introduces stem buckling and angle of twist design inputs that shall be considered in the valve design. Specifically for stem buckling design considerations, a number of different model equations, based on stem guiding end designs (fixed, pinned, or combination thereof), are ava
42、ilable to the designer for consideration. For moderate length stems where combined compression/buckling failure mode may occur, there are many empirical equations that can be used. These multiple model and empirical equations are a deterrent to standardization of stem design methods. Appendix X1 is
43、offered as a guideline for stem design, which may be used by manufacturers that subscribe to the models and empirical equations used in the Appendix. 5.6.1 Stem calculations are a requirement of this Standard Practice and the manufacturer shall utilize the guidance of Appendix XI or other stem model
44、 derivatives to arrive at such calculations. 6. GATE ASME/ANSI B16.34-2009 Valves Flanged, Threaded, and Welding End; w/ Supplement (2010) B31.3-2010 Process Piping BPVC-VIII, Div. 1-2010 Boiler and Pressure Vessel Code, Section VIII, Division 1, Rules for Construction of Pressure Vessels; w/ Addend
45、a Reprint (2011) API; ANSI/API 6D-2008 (ISO 14313:2007) Specification for Pipeline Valves; w/ Addendum 1 (2009) and Addendum 2 (2011), Errata 1 (2008), Errata 2 (2008), Errata 3 (2009), Errata 4 (2010), Errata 5 (2010), and Errata 6 (2011) (Identical to ISO 14313:2007, Petroleum and Natural Gas Indu
46、stries Pipeline Transportation Systems) 600-2009 Steel Gate Valves Flanged and Butt-welding Ends, Bolted Bonnets; w/ Errata 1 (2009) 602-2009 Steel Gate, Globe, and Check Valves for Sizes NPS 4 (DN 100) and Smaller for the Petroleum and Natural Gas Industries 603-2007 Corrosion-resistant, Bolted Bon
47、net Gate Valves Flanged and Butt-welding Ends 608-2008 Metal Ball Valves Flanged, Threaded and Welding Ends 609-2009 Butterfly Valves: Double Flanged, Lug- and Wafer-type MSS SP-96-2011 Guidelines on Terminology for Valves and Fittings The following organizations appear in the above list: ANSI Ameri
48、can National Standards Institute, Inc. 25 West 43rdStreet, Fourth Floor New York, NY 10036-7406 ASME American Society of Mechanical Engineers (ASME International) Three Park Avenue New York, NY 10016-5990 API American Petroleum Institute 1220 L Street, NW Washington, D.C. 20005-4070 ISO Internationa
49、l Organization for Standardization 1, ch. de la Voie-Creuse, Case postal 56 CH-1211 Geneva 20, Switzerland MSS Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. 127 Park Street, NE Vienna, VA 22180-4602 MSS STANDARD PRACTICE SP-13416 APPENDIX X1 Guidance for Stem Strength Calculations This Appendix is supplementary and does not include mandatory requirements. X1.1 Valve Stems X1.1.1 Gate and globe valve stems shall have an area and length to diameter (or radius of gyration) ratio that precludes compression stres
