MSS SP-122-2012 Plastic Industrial Ball Valves.pdf

1、 MSS SP-122-2012 Plastic Industrial Ball 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: standardsmss-hq.org www.mss

2、-hq.org MSS MSS STANDARD PRACTICE SP-122 i This MSS Standard Practice was developed under the consensus of the MSS Technical Committee 402 and the MSS Coordinating Committee. The content of this Standard Practice is the resulting efforts of competent and experienced volunteers to provide an effectiv

3、e, 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 itself

4、 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 otherwise

6、 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 thos

7、e 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 hel

8、d 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 ess

9、ential 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. U.S. cus

10、tomary units in this Standard Practice are the standard; (SI) metric units are for reference only. Substantive changes in this 2012 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

11、with that in the previous edition. Non-toleranced dimensions in this Standard Practice are nominal, 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 MSS SP-122-2012 wit

12、h 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 Valv

13、e and Fittings Industry Inc. All rights reserved. Originally Published: August 1997 Current Edition Approved: July 2011 Current Edition Published: May 2012 MSS is a trademark of Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. Copyright , 2012 by Manufacturers Standardi

14、zation Society of the Valve and Fittings Industry, Inc. Printed in U.S.A. MSS STANDARD PRACTICE SP-122 ii TABLE OF CONTENTS SECTION PAGE 1 SCOPE . 1 2 MATERIALS OF CONSTRUCTION 1 3 PRESSURE-TEMPERATURE RATINGS AND DESIGN REQUIREMENTS 1 4 LAYING LENGTH DIMENSIONS . 2 5 SAFETY FEATURES . 2 6 PORT SIZE

15、 2 7 ACTUATOR APPLICATION REQUIREMENTS . 2 8 PRODUCTION TESTS . 3 9 MARKING 3 TABLE 1 Industrial Union Ball Valves Laying Lengths 5 FIGURE 1 Union Ball Valve . 4 2 Single Union Ball Valve 4 3 Non-Union Ball Valve . 4 ANNEX A Referenced Standards and Applicable Dates . 6 MSS STANDARD PRACTICE SP-122

16、1 PLASTIC INDUSTRIAL BALL VALVES 1. SCOPE 1.1 This Standard Practice establishes requirements for plastic industrial ball valves in nominal pipe sizes (NPS) 1/2 through 4, designed for general industrial systems for the distribution of pressurized liquids that are chemically compatible with the pipi

17、ng material. It reflects the industry practice for the design, manufacture, and application of these valves. 1.2 This Standard Practice applies to valves having the ball seal against two self-lubricating seats of the following types: a) Union Ball Valves All joint ends have detachable nuts and end c

18、onnectors. b) Single Union Ball Valves Only one joint end has detachable nut and end connector, with the other joints being integral to the valve body. c) Non-Union Ball Valves All joint ends are integral to the valve body. 1.3 This Standard Practice covers the following: a) Materials of Constructio

19、n b) Pressure-Temperature Ratings and Design Requirements c) Commonly Used Laying Length Dimensions d) Safety Features e) Port Size f) Actuator Application Requirements f) Production Tests f) Markings 2. MATERIALS OF CONSTRUCTION 2.1 Plastic materials, such as polyvinyl chloride (PVC), chlorinated p

20、olyvinyl chloride (CPVC), acrylonitrile-butadiene styrene (ABS), polypropylene (PP), and polyvinylidene fluoride (PVDF) are routinely used as materials of construction for ball valves types indicated in this Standard Practice. Due to the number of grades and classifications of these materials, stand

21、ard specifications cannot be readily established and are subject to agreement between customer and manufacturer. If intended for use in potable water, the materials should be listed for that use by an independent testing laboratory or agency. 2.2 Seals and seats of various materials are commonly use

22、d in plastic valves. The manufacturer shall ensure the seals and seats provided are compatible with the stated intended use. 2.3 Any lubricants used shall be nontoxic, shall not support the growth of bacteria, and shall have no deteriorating effect on the seal or component materials. 3. PRESSURE-TEM

23、PERATURE RATINGS AND DESIGN REQUIREMENTS 3.1 The maximum non-shock pressure-temperature ratings of valves covered by this Standard Practice shall be those established by the manufacturer for the particular design and material. The design stresses in the components of the valves shall comply with the

24、 following: MSS STANDARD PRACTICE SP-122 2 a) The maximum allowable tensile stress shall be the hydrostatic design stress (HDB), determined as per ASTM D2837, and multiplied by a service factor of 0.50. b) The maximum allowable compressive stress shall be the HDB multiplied by a service factor of 0.

25、50, unless data can be shown to justify a different value. c) The maximum allowable shear stress shall be the HDB multiplied by a safety factor of 0.25, unless data can be shown to justify a different value. 3.2 The entire valve assembly, including detachable nuts and end connectors, shall be design

26、ed to resist, without rupture, a test pressure of: a) 2.1 times the pressure rating for a period of 1000 hours; b) 2.5 times the test pressure for a period of 1 hour; and c) 3.2 times the pressure rating for a period of 60 seconds. A sample size of 10 valves installed in a simple system shall be con

27、sidered a representative test. Retests shall be performed when wall thickness, thread strengths, or material changes are made. 3.3 In order to enable the manufacturer to make proper recommendations regarding valve type and material selection, the following information shall be provided by the purcha

28、ser or user: a) Valve size b) Type joints/end connections c) Working pressure range d) Working temperature range e) Medium handled, including concentration of acid or base f) Mode and/or frequency of operation g) Maximum flow rate h) Line shock conditions i) Vacuum conditions j) Use of cleaning flui

29、ds k) Environment of valve location (i.e., outdoors, manufacturing facility, chemical plant, etc) 4. LAYING LENGTH DIMENSIONS 4.1 Laying lengths are peculiar to the particular manufacturers design. Commonly used laying lengths for union ball valves are given in Table 1, for the guidance of plastic b

30、all valve users. 5. SAFETY FEATURES 5.1 All ball valves covered by this Standard Practice shall have a design that prevents blowout of internal components, when either end (upstream or downstream) is disconnected from the non-pressurized side of the piping system. 5.2 A mechanism shall be available

31、from the manufacturer to allow the valve to be locked into the closed position, to allow maintenance of the downstream system or equipment. This lockout mechanism shall be capable of being installed on the valve after installation without modification of the valve itself. 6. PORT SIZE 6.1 All union

32、and single-union type valves shall be full-port design; meaning that the flow channel through ball has an inside diameter that is equal to or larger than that of Schedule 80 pipe. 6.2 Non-union type valves may be full port or reduced port, as per agreement between customer and manufacturer. 7. ACTUA

33、TOR APPLICATION REQUIREMENTS 7.1 Manually operated valves shall be operated by quarter-turn opening levers with counter-clockwise rotation to open the valve. The lever shall be of sufficient length to operate the valve with a reasonable force, while the valve is pressurized. MSS STANDARD PRACTICE SP

34、-122 3 7.2 Levers shall be marked with the “OPEN” and “CLOSE” direction indicated. 7.3 Pneumatic, hydraulic, pneumatic spring return, hydraulic spring return, or electric actuators shall be sized to be capable of closing and opening the valve against a minimum of 1.5 times the working pressure as sh

35、own below: SMT 5.1+= Where: T = Minimum operating torque of actuator at open or close M = Average torque at 1.5 times the rated working pressure of the valve S = One standard deviation of the torque 8. PRODUCTION TESTS 8.1 Prior to shipment, all valves shall be tested for seat leakage in both direct

36、ions and tested for shell leakage with the ball in the open and partially open positions. The test pressure and fluid shall be according to the manufacturers specification. The production tests shall be designed so as to verify that no leakage occurs throughout the range of the valves recommended op

37、erating parameters and fluid flow. 9. MARKING 9.1 Each valve shall be marked with manufacturers name, size, material of construction, material of seal construction, pressure rating at 73 F (23 C), country of manufacturer, and listings for specific applications (if applicable). MSS STANDARD PRACTICE

38、SP-122 4 FIGURE 1 Union Ball Valve (Illustrative Only) FIGURE 2 Single-Union Ball Valve (Illustrative Only) FIGURE 3 Non-Union Ball Valve (Illustrative Only) MSS STANDARD PRACTICE SP-122 5 TABLE 1 Industrial Union Ball Valves Laying Lengths (See Figure 1) SOCKET JOINT / END CONNECTION NPS Short, in.

39、 (mm) Medium, in. (mm) Long, in. (mm) 1/2 2.35 (59.7) 2.45 (62.2) 3.30 (83.8) 3/4 2.75 (69.9) 3.00 (76.2) 4.00 (101.6) 1 3.00 (76.2) 3.25 (82.6) 4.25 (108.0) 1 3.44 (87.4) 4.00 (101.6) 4.50 (114.3) 1 3.88 (98.6) 4.00 (101.6) 5.30 (134.6) 2 4.75 (120.7) 5.00 (127.0) 5.75 (146.1) 2 6.00 (152.4) 7.33 (

40、186.2) 8.35 (212.1) 3 6.30 (160.0) 6.60 (167.6) 8.15 (207.0) 4 7.50 (190.5) 7.75 (196.9) 8.45 (214.6) THREADED JOINT / END CONNECTION NPS Short, in. (mm) Medium, in. (mm) Long, in. (mm) 1/2 2.43 (61.7) 3.15 (80.0) 3.70 (94.0) 3/4 3.15 (80.0) 3.75 (95.3) 4.00 (101.6) 1 3.25 (82.6) 4.12 (104.6) 5.50 (

41、139.7) 1 4.50 (114.3) 5.00 (127.0) 6.00 (152.4) 1 3.75 (95.3) 5.00 (127.0) 5.56 (141.2) 2 4.70 (119.4) 6.25 (158.8) 6.75 (171.5) 2 6.60 (167.6) 7.75 (196.9) 8.70 (221.0) 3 6.60 (167.6) 8.50 (215.9) 9.00 (228.6) 4 8.50 (215.9) 10.15 (257.8) 10.75 (273.1) FLANGED JOINT / END CONNECTION NPS Short, in.

42、(mm) Medium, in. (mm) Long, in. (mm) 1/2 5.62 (142.7) 6.12 (155.4) 6.75 (171.5) 3/4 7.13 (181.1) 7.25 (184.2) 8.12 (206.2) 1 7.50 (190.5) 8.00 (203.2) 8.50 (215.9) 1 9.00 (228.6) 9.50 (241.3) 10.00 (254.0) 1 8.35 (212.1) 9.75 (247.7) 10.00 (254.0) 2 9.21 (233.9) 11.10 (281.9) 11.40 (289.6) 2 10.20 (

43、259.1) 12.00 (304.8) 14.40 (365.8) 3 12.00 (304.8) 14.40 (365.8) 14.75 (374.7) 4 14.70 (373.4) 17.13 (435.1) 17.65 (448.3) Note: Laying length is defined as the distance the valve occupies between the ends of the connecting pipe. MSS STANDARD PRACTICE SP-122 6 ANNEX A Referenced Standards and Applic

44、able Dates This Annex is an integral part of this Standard Practice and is placed after the main text for convenience. Standard Name Description ASTM D2837-11 Standard Test Method for Obtaining Hydrostatic Design Basis for Thermoplastic Pipe Materials or Pressure Design Basis for Thermoplastic Pipe

45、Products The following organizations appear in the above list: ASTM ASTM International 100 Barr Harbor Drive, P.O. Box C700 West Conshohocken, PA 19428-2959 Listing of MSS Standard Practices (as of May, 2012) TITLE SP-6-2012 Standard Finishes for Contact Faces of Pipe Flanges and Connecting-End Flan

46、ges of Valves and Fittings SP-9-2008 Spot Facing for Bronze, Iron and Steel Flanges SP-25-2008 Standard Marking System for Valves, Fittings, Flanges, and Unions SP-42-2009 Corrosion Resistant Gate, Globe, Angle and Check Valves with Flanged and Butt Weld Ends (Classes 150, 300 & 600) SP-43-2008 Wrou

47、ght and Fabricated Butt-Welding Fittings for Low Pressure, Corrosion Resistant Applications (Incl. 2010 Errata Sheet) SP-44-2010 Steel Pipeline Flanges (incl. 2011 Errata Sheet) SP-45-2003 (R 2008) Bypass and Drain Connections SP-51-2012 Class 150LW Corrosion Resistant Flanges and Cast Flanged Fitti

48、ngs SP-53-1999 (R 2007) Quality Standard for Steel Castings and Forgings for Valves, Flanges, and Fittings and Other Piping Components Magnetic Particle Examination Method SP-54-1999 (R 2007) Quality Standard for Steel Castings and Forgings for Valves, Flanges, and Fittings and Other Piping Componen

49、ts Radiographic Examination Method SP-55-2011 Quality Standard for Steel Castings for Valves, Flanges, Fittings, and Other Piping Components Visual Method for Evaluation of Surface Irregularities (ANSI-approved American National Standard) SP-58-2009 Pipe Hangers and Supports Materials, Design, Manufacture, Selection, Application, and Installation (incorporates content of SP-69, 77, 89, and 90) (ANSI-approved American National Standard) SP-60-2012 Connecting Flange Joints between Tapping Sleeves and Tapping Valves SP-61-2009 Pressure Testing of Valves SP-6