1、MSS SP-140-2017 Quality Standard Practice for Preparation of Valves and Fittings for Silicone-Free Service 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) 281-6
2、613 Fax: (703) 281-6671 E-mail: standardsmsshq.org www.msshq.org MSS STANDARD PRACTICE SP-140i This MSS Standard Practice was developed under the consensus of MSS Technical Committees 304, 401, 407, and the MSS Coordinating Committee. After initial publication, future maintenance was transferred to
3、C-304. 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 requirements and is intended as a basis for
4、 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 Standard Practice is established only by refe
5、rence 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 requirements of this Standard Practice shall
6、 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 was applicable to this Standard Practice at
7、the date of approval of this MSS Standard Practice. 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 publication of this Standard Practice, no position is taken with r
8、espect 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 of infringement of such rights are entirely their respon
9、sibility. 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”. All appendices, if included, that appear in this document
10、 are construed as “supplemental”. Note that supplemental information does not include mandatory requirements. U.S. customary units in this Standard Practice are the standard; the SI (metric) units are for reference only. Substantive changes in this 2017 edition are “flagged” by parallel bars as show
11、n 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. Non-toleranced dimensions in the Standard Practice are nominal unless otherwise specified. Excerpts of this Standard Practice may be quoted wit
12、h written permission. Credit lines should read Extracted from MSS SP-140-2017 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 writt
13、en permission is granted by the Manufacturers Standardization Society of the Valve and Fittings Industry Inc. All rights reserved. Originally Approved: February 2011 Originally Published: November 2011 (2012 Edition) Current Edition Approved: November 2016 Current Edition Published: January 2017 MSS
14、 is a registered trademark of the Manufacturers 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-140ii FOREWORD This Standard Practice was dev
15、eloped by a cooperative effort of representatives of manufacturers, including those who produce silicone-free valves and fittings. It is based on current best practices and on the collective experience of the industry at this time. MSS STANDARD PRACTICE SP-140iii TABLE OF CONTENTS SECTION PAGE 1 SCO
16、PE . 1 2 OBJECTIVE 1 3 GENERAL REQUIREMENTS . 1 4 CLEANING . 2 5 ASSEMBLY AND TESTING OF VALVES 2 6 INSPECTION AND ACCEPTANCE CRITERIA 3 7 PACKAGING 3 8 MARKING . 4 MSS STANDARD PRACTICE SP-1401 QUALITY STANDARD PRACTICE FOR PREPARATION OF VALVES AND FITTINGS FOR SILICONE-FREE SERVICE 1. SCOPE 1.1 T
17、his Standard Practice establishes general requirements for valves and fittings for use in silicone-free service requiring an increased level of cleanliness. Specific requirements include: a) Cleaning b) Assembly and Testing of Valves c) Inspection and Acceptance d) Packaging e) Marking 1.2 Purpose T
18、his Standard Practice is intended for applications such as painting systems which are sensitive to silicone contamination and for other services requiring an increased level of cleanliness above that of standard industrial valves and fittings. 2. OBJECTIVE 2.1 The objective of this Standard Practice
19、 is to present methods that, when properly applied and combined, will yield a degree of cleanliness suitable for silicone-free systems. 2.2 The proper combination of methods depends upon the component(s), method of manufacture, and if silicone contamination is present. 3. GENERAL REQUIREMENTS 3.1 An
20、y cleaning agent used must be compatible with the material of the component being cleaned. 3.2 Chloride-free cleaning agents shall be used on stainless steel. 3.3 This Standard Practice does not purport to address all of the safety concerns, if any, associated with its use. ADVISORY: It is the respo
21、nsibility of the user of this Standard Practices to establish appropriate safety and health practices, and to determine the applicability of regulatory limitations. 3.4 Used cleaning solutions shall be disposed of in accordance with appropriate hazardous waste regulations. 3.5 Cleaning, inspection,
22、post-clean testing, and packaging shall be conducted by properly trained and qualified personnel knowledgeable of this Standard Practice. _ INFORMATIONAL NOTE: Piping and flanges are outside the scope of this Standard Practice. However, flanges are covered only if they are integral to the valve or f
23、itting. MSS STANDARD PRACTICE SP-1402 4. CLEANING 4.1 Valves Prior to assembling the valve, all parts shall be separately cleaned per the following procedure: 4.1.1 The area for cleaning shall be clean and dust-free. All cleaning shall be performed in an area that is free from silicone and airborne
24、silicone particles. 4.1.2 The assembly bench shall be covered with a clean polyethylene sheet or equivalent. 4.1.3 A full-length lint-free lab coat, or equivalent, and lint-free gloves shall be worn while in the cleaning area. 4.1.4 All valve part surfaces shall be thoroughly cleaned using appropria
25、te cleaning agents, per instructions provided by the cleaning agent manufacturer. 4.1.4.1 Safety Data Sheets (SDS), formally known as Material Safety Data Sheets (MSDS), shall be consulted for proper handling of cleaning agents. 4.1.4.2 Some solvents may damage non-metallic parts of the valve. The c
26、leaning agent manufacturer should be consulted for compatibility with valve part materials, or sample parts should be tested to ensure the cleaning agent is not harmful to the part. 4.1.5 Clean all surfaces which may contact the valve to remove all traces of silicone. 4.2 Fittings All fittings shall
27、 be cleaned per the following procedure: 4.2.1 The area for cleaning shall be clean and dust-free. All cleaning shall be performed in an area that is free from silicone and airborne silicone particles. 4.2.2 A full-length lint-free lab coat, or equivalent, and lint-free gloves shall be worn while in
28、 the cleaning area. 4.2.3 Each fitting shall be thoroughly cleaned using appropriate cleaning agents, per instructions provided by the cleaning agent manufacturer. 4.2.3.1 SDS/MSDS shall be consulted for proper handling of cleaning agents. 4.2.3.2 Some solvents may damage non-metallic fittings. The
29、cleaning agent manufacturer should be consulted for compatibility with fitting material, or sample fittings should be tested to ensure the cleaning agent is not harmful to the fitting. 5. ASSEMBLY AND TESTING OF VALVES(a)5.1 All assembly tools shall be cleaned with acceptable cleaning agents. 5.2 As
30、sembly shall occur in a clean and dust-free environment. 5.3 Assemble the valve and conduct testing as per the appropriate product standard. 5.3.1 Surfaces of the test equipment coming in contact with the valve should be cleaned with an appropriate cleaning agent. 5.3.2 Testing shall not introduce s
31、ilicone into the valve as a byproduct. NOTE: (a) The assembly and/or testing of fittings may not be typical; however, if such processes are necessary, as agreed between the purchaser and fitting manufacturer, then Section 5 shall be followed. MSS STANDARD PRACTICE SP-1403 6. INSPECTION AND ACCEPTANC
32、E CRITERIA 6.1 This inspection and acceptance test shall be utilized unless an alternative procedure is required by the purchaser. The silicone-free test utilizes a degreaser or solvent specified by the valve or fitting manufacturer. Degreasers and solvents should be handled and disposed of in accor
33、dance with SDS/MSDS and all governmental and environmental requirements. The manufacturer shall verify that the degreaser will not react with the test paint used in Section 6.4. 6.2 Prepare a test plate to verify the valve or fitting is free of silicone contamination. Clean a stainless steel plate (
34、typical size is 6 in. x 6 in. (152 mm x 152 mm), however, plate should be sized to capture all of the run-off) with appropriate degreaser and allow to dry. Wipe the test plate with an isopropyl alcohol soaked, lint-free cloth, to eliminate any static charge. Allow to dry thoroughly. Spray all interi
35、or and exterior surfaces of the valve or fitting with the specified degreaser and catch the liquid run-off on the prepared test plate. 6.3 The degreaser shall be allowed to dry (degreaser will evaporate rapidly). Avoid breathing degreaser vapors. 6.4 The plate shall be sprayed with an acrylic spray
36、paint or other type of paint, as specified by the purchaser. Silicone will prevent the paint from sticking to the plate, creating defects (“fish-eyes“ or bubbles) in the painted finish. 6.5 Any visual paint defect, including “fish-eyes” or bubbles, is cause for rejection. 6.6 Multiple valves or fitt
37、ings, up to a total of fifteen (15), may be tested by spraying each sample and dripping onto a single stainless steel test plate and then processing as specified. All valves or fittings are either accepted or rejected by the test. 6.7 Fittings may be inspected per a random sampling plan, deemed acce
38、ptable by agreement between the purchaser and fitting manufacturer. 7. PACKAGING 7.1 Valves The valve opening should be covered with protective metal or plastic caps or plugs that have been cleaned as per this Standard Practice. The inspected and accepted valve assembly shall be individually wrapped
39、 with a minimum 3 mils (0.076 mm) thick unused polypropylene plastic(a)and sealed with reinforced tape. Other packaging materials are acceptable by agreement between the purchaser and valve manufacturer. Item identification markings shall be clearly visible without opening the bag. When group packag
40、ing, each item is to be individually sealed in a polypropylene plastic bag. 7.2 Fittings Fittings that have been cleaned per this Standard Practice shall be packaged individually, or in multiple quantities, in an unused polypropylene plastic(a)bag with a 3 mils (0.076 mm) minimum thickness. The bag
41、shall be heat-sealed to prevent contaminants from entering. Other packaging materials are acceptable by agreement between the purchaser and fitting manufacturer. Item identification markings shall be clearly visible without opening the bag. When group packaging, each item is to be individually seale
42、d in a polypropylene plastic bag. NOTE: (a) Unused polypropylene plastic inherently refers to a “clean” product that is free of grease and silicone, or other contaminants. MSS STANDARD PRACTICE SP-1404 8. MARKING 8.1 The outside of the packaging is to be marked with: a) “Silicone-Free Per MSS SP-140
43、” b) Manufacturers name and product identification number c) Date of packaging d) “Keep sealed until required for use” Purchase or View a Full Listing of MSS Standards at: http:/msshq.org/Store/PriceList.cfm MSS Standard Practices (SPs) related to or referenced in this publication: ANSI/MSS SP-25 St
44、andard Marking System for Valves, Fittings, Flanges, and UnionsANSI/MSS SP-96 Guidelines on Terminology for Valves and Fittings American National Standards Published by MSS, an ANSI-accredited Standards Developer:ANSI/MSS SP-25 Standard Marking System for Valves, Fittings, Flanges, and UnionsANSI/MS
45、S SP-44 Steel Pipeline FlangesANSI/MSS SP-55 Quality Standard for Steel Castings for Valves, Flanges, Fittings, and Other Piping Components Visual Method for Evaluation of Surface IrregularitiesANSI/MSS SP-58 Pipe Hangers and Supports - Materials, Design, Manufacture, Selection, Application, and Ins
46、tallationANSI/MSS SP-96 Guidelines on Terminology for Valves and Fittings ANSI/MSS SP-114 Corrosion Resistant Pipe Fittings Threaded and Socket Welding Class 150 and 1000ANSI/MSS SP-134 Valves for Cryogenic Service, including Requirements for Body/Bonnet ExtensionsANSI/MSS SP-135 High Pressure Knife
47、 Gate Valves ANSI/MSS SP-138 Quality Standard Practice for Oxygen Cleaning of Valves and FittingsANSI/MSS SP-144 Pressure Seal Bonnet Valves Do not violate copyright laws All Standard Practices are officially available only from MSS and through our authorized distributors: About MSS The Manufacturer
48、s Standardization Society (MSS) of the Valve and Fittings Industry is a non-profit technical association organized for development and improvement of industry, national and international codes and standards for Valves, Valve Actuators, Valve Modifications, Pipe Fittings, Flanges, Pipe Hangers and Su
49、pports, and Associated Seals. Since its establishment in 1924, MSS has been dedicated to developing standards for national and global applications, in cooperation with other standardizing bodies and regulatory authorities. For more information on membership and eligibility requirements, visit: http:/msshq.org/Store/Membership.cfm Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. 127 Park Street, NE, Vienna, VA 22180-4620 Phone (703) 281-6613 Fax
