1、Type Testing of Quarter-turn Valves for Fugitive EmissionsAPI STANDARD 641 FIRST EDITION, OCTOBER 2016the information contained herein.Any manufacturer marking equipment or materials in conformance with the marking requirements of an API standard is solely responsible for complying with all the appl
2、icable requirements of that standard. API does not represent, warrant, or guarantee that such products do in fact conform to the applicable API standard.All rights reserved. No part of this work may be reproduced, translated, stored in a retrieval system, or transmitted by any means, electronic, mec
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5、he accuracy, completeness, or usefulness of the information contained herein, or assume any liability or responsibility for any use, or the results of such use, of any information or process disclosed in this publication. Neither API nor any of APIs employees, subcontractors, consultants, or other a
6、ssignees represent that use of this publication would not infringe upon privately owned rights.API publications may be used by anyone desiring to do so. Every effort has been made by the Institute to ensure the accuracy and reliability of the data contained in them; however, the Institute makes no r
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8、 published to facilitate the broad availability of proven, sound engineering and operating practices. These publications are not intended to obviate the need for applying sound engineering judgment regarding when and where these publications should be utilized. The formulation and publication of API
9、 publications is not intended in any way to inhibit anyone from using any other practices.Classified areas may vary depending on the location, conditions, equipment, and substances involved in any given situation. Users of this standard should consult with the appropriate authorities having jurisdic
10、tion.Users of this standard should not rely exclusively on the information contained in this document. Sound business, scientific, engineering, and safety judgment should be used in employing the information contained herein.API is not undertaking to meet the duties of employers, manufacturers, or s
11、uppliers to warn and properly train and equip their employees and others exposed, concerning health and safety risks and precautions, nor undertaking their obligations to comply with authorities having jurisdiction.All rights reserved. No part of this work may be reproduced, translated, stored in a
12、retrieval system, or transmitted by any means, electronic, mechanical, photocopying, recording, or otherwise, without prior written permission from the publisher. Contact the publisher, API Publishing Services, 1220 L Street, NW, Washington, DC 20005.Copyright 2016 American Petroleum InstituteForewo
13、rdThis standard is under the jurisdiction of the API Subcommittee on Piping and Valves.This standard shall become effective on the date printed on the cover but may be used voluntarily from the date of publication.Nothing contained in any API publication is to be construed as granting any right, by
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19、his review cycle. Status of the publication can be ascertained from the API Standards Department, telephone (202) 682-8000. A catalog of API publications and materials is published annually by API, 1220 L Street, NW, Washington, DC 20005.Suggested revisions are invited and should be submitted to the
20、 Standards Department, API, 1220 L Street, NW, Washington, DC 20005, standardsapi.org.iiiContents1 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Normative References . . . .
21、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Terms and Definitions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Symbol
22、s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 Packing Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
23、 . . . . . . . . . . . . . . 36 Valve Selection and Test Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 Safety Considerations for Type Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
24、 . . . . . . . . . . . . . . . 38 Type Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 Acceptance Criteria. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
25、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 810 Leak Test Equipment and Calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 811 Valves Qualified . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
26、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 912 Valve Marking. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9Annex A (normative) Fugitive Emissions Test R
27、eport. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10Annex B (normative) Testing Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12Annex C (informative) Valve Groups Flow
28、chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13Figures1 Valve Cycling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 Calibratio
29、n Setup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9C.1 Test Temperature and Pressure: Valve Temperature Rating 260 C (500 F) . . . . . . . . . . . . . . . . . . . . . 13C.2 Test Temperature and Pre
30、ssure: Valve Temperature Rating 260 C (500 F) . . . . . . . . . . . . . . . . . . . . . 14Tables1 Valve Groups: Valve Temperature Rating 260 C (500 F) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 Valve Groups: Valve Temperature Rating 260 C (500 F) . . . . . . . . .
31、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6vIntroduction The purpose of this standard is to establish a uniform procedure for the evaluation of emission performance of process valves. The testing program will provide a basis for the comparison of the emissions and performance of pro
32、cess valves.Use of this standard assumes the execution of its provisions is entrusted to appropriately qualified and experienced personnel because it calls for procedures that can be injurious to health if adequate precautions are not taken. This standard refers only to technical suitability and doe
33、s not absolve the user from legal obligations relating to health and safety at any stage of the procedure.1 Type Testing of Quarter-turn Valves for Fugitive Emissions 1 Scope This standard specifies the requirements and acceptance criteria for fugitive emission type testing of quarter-turn valves. T
34、he type testing requirements contained herein are based on elements of EPA Method 21. Valves larger than NPS 24 and valves greater than ASME B16.34 class 1500 are outside the scope of this standard. Valves with a pressure rating at ambient temperature less than 6.89 barg (100 psig) are outside the s
35、cope of this standard. Repacking or resealing of valves is outside the scope of this standard. 2 Normative References The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest ed
36、ition of the referenced document (including any amendments) applies. API Standard 622, Type Testing of Process Valve Packing for Fugitive Emissions EPA Method 21 1, Determination of Volatile Organic Compound Leaks ASME B16.34 2, Valves Flanged, Threaded, and Welding End 3 Terms and Definitions For t
37、he purposes of this standard, the following definitions apply. 3.1 ambient temperature Temperature that is between 15 C to 40 C (59 F to 104 F). 3.2 auxiliary connection(s) Drain(s), vent(s), thermal relief(s), or injection port(s). 3.3 closing torque The amount of torque required to achieve valve c
38、losure and seat leakage tightness meeting manufacturers published acceptance criteria at maximum pressure differential. 3.4 dynamic leak measurement Measurement of leakage taken at the valve stem while the stem is travelling through an opening and/or closing cycle per elements of EPA Method 21. 3.5
39、EPA Method 21 A leak check method established by the United States Environmental Protection Agency (EPA) for performing emission measurements on equipment such as valves, pumps, and flanges. 3.6 emissions Gaseous leak given off by a piece of equipment used in reference to volatile organic compounds
40、and expressed in parts per million volumetric (ppmv or ppm) for methane. 1 United States Environmental Protection Agency, 1200 Pennsylvania Avenue, NW, Washington, DC 20460, www.epa.gov. 2 ASME International, 2 Park Avenue, New York, New York 10016-5990, www.asme.org. 2 API STANDARD 641 3.7 leakage
41、Measurable amount of test medium escaping from the valve. 3.8 manufacturing facility Location of final assembly, inspection, and testing of the valve selected for evaluation. 3.9 mechanical cycle A motion of the stem that moves a valve from the fully closed (or opened) position to the fully open (or
42、 closed) position, and returning to the fully closed (or opened) position. 3.10 obturator Part of a valve, such as a ball, disc, or plug, that is positioned in the flow stream to permit or prevent flow. 3.11 packing torque The amount of torque on the gland bolts that transfers a compressive force to
43、 the packing. 3.12 qualification facility A testing entity capable of type testing quarter-turn valves for fugitive emissions in accordance with this standard. 3.13 quarter-turn valve A rotary valve that will fully open or close with approximately 90 rotation of the obturator with a nonrising stem.
44、3.14 running torque The amount of torque required to continue stem rotation between full open and closed positions. 3.15 static leak measurement Measurement of leakage taken with valve in the partially open position when the stem is not turning, per elements of EPA Method 21. 3.16 stem Metal rod tha
45、t connects the obturator of a valve to a handwheel, handle, or actuator. 3.17 thermal cycle A change in temperature from ambient temperature, to elevated and/or lower temperature(s), and back to ambient temperature. 3.18 third party A person, group, company, agency, corporation, or designated repres
46、entative independent from the manufacturer responsible for valve certification. 3.19 type testing A test, or series of tests, conducted to determine if a valve design is capable of complying with a prescribed set of acceptance criteria. TYPE TESTING OF QUARTER-TURN VALVES FOR FUGITIVE EMISSIONS 3 4
47、Symbols For the purposes of this standard, the following symbols are used. Pa valve pressure at ambient temperature Pe valve pressure at elevated temperature Te valve elevated temperature Ta ambient temperature 5 Packing Testing The manufacturer shall define the valve service temperature range for i
48、ts sealing material. Packing sets used as the stem seal for purposes of controlling fugitive emissions within the scope of API Standard 622 shall be qualified for the fugitive emissions (either the rising or rotating stem test), corrosion, and materials tests required by API Standard 622. Packing ou
49、tside the scope of API Standard 622 and other materials used as the stem seal do not require pretesting. 6 Valve Selection and Test Preparation 6.1 The test valve shall be fully assembled, tested to applicable industry standards, and ready for fugitive emission testing. The test valve shall be randomly selected from manufacturer or distributor stock, where such stock is available. For valves not in stock, the manufacturer shall certify that the test valve was not modified in any way to meet type test requirements and is a typical representation of the manufacturers
