UL 132-2015 UL Standard for Safety Relief Valves for Anhydrous Ammonia and LP-Gas (Eighth Edition Reprint with revisions through and including January 12 2018).pdf

1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 132 Safety Relief Valves for Anhydrous Ammonia and LP-GasUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT

2、 AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Safety Relief Valves for Anhydrous Ammonia and LP-Gas, UL 132 Eighth Edition, Dated June 30, 2015 Summary of Topics This revision of ANSI/UL 132 includes changes to the Moist Ammonia-Air Stress

3、 Cracking Test, Section 22, inadvertently left out of the new edition. Text that has been changed in any manner or impacted by ULs electronic publishing system is marked with a vertical line in the margin. The revised requirements are substantially in accordance with Proposal(s) on this subject date

4、d May 8, 2015. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form by any means, electronic, mechanical photocopying, recording, or otherwise without prior permission of UL. UL provides this Standard as is without warranty of a

5、ny kind, either expressed or implied, including but not limited to, the implied warranties of merchantability or tness for any purpose. In no event will UL be liable for any special, incidental, consequential, indirect or similar damages, including loss of prots, lost savings, loss of data, or any o

6、ther damages arising out of the use of or the inability to use this Standard, even if UL or an authorized UL representative has been advised of the possibility of such damage. In no event shall ULs liability for any damage ever exceed the price paid for this Standard, regardless of the form of the c

7、laim. Users of the electronic versions of ULs Standards for Safety agree to defend, indemnify, and hold UL harmless from and against any loss, expense, liability, damage, claim, or judgment (including reasonable attorneys fees) resulting from any error or deviation introduced while purchaser is stor

8、ing an electronic Standard on the purchasers computer system. JULY 2, 2015 UL 132 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL JULY 2, 2015 UL 132 tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION

9、OR DISTRIBUTION WITHOUT PERMISSION FROM UL JUNE 30, 2015 (Title Page Reprinted: July 2, 2015) 1 UL 132 Standard for Safety Relief Valves for Anhydrous Ammonia and LP-Gas The First and Second editions were titled Relief Valves for Anhydrous Ammonia and LP-Gas. First Edition December, 1958 Second Edit

10、ion August, 1969 Third Edition January, 1973 Fourth Edition October, 1984 Fifth Edition April, 1993 Sixth Edition March, 1997 Seventh Edition October, 2007 Eighth Edition June 30, 2015 This ANSI/UL Standard for Safety consists of the Eighth Edition including revisions through July 2, 2015. The most

11、recent designation of ANSI/UL 132 as an American National Standard (ANSI) occurred on June 30, 2015. ANSI approval for a standard does not include the Cover Page, Transmittal Pages, Title Page, or effective date information. Comments or proposals for revisions on any part of the Standard may be subm

12、itted to UL at any time. Proposals should be submitted via a Proposal Request in ULs On-Line Collaborative Standards Development System (CSDS) at http:/. ULs Standards for Safety are copyrighted by UL. Neither a printed nor electronic copy of a Standard should be altered in any way. All of ULs Stand

13、ards and all copyrights, ownerships, and rights regarding those Standards shall remain the sole and exclusive property of UL. COPYRIGHT 2015 UNDERWRITERS LABORATORIES INC. ANSI/UL 132-2015UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL JUNE

14、30, 2015 SAFETY RELIEF VALVES FOR ANHYDROUS AMMONIA AND LP-GAS - UL 132 2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS INTRODUCTION 1 Scope .4 2 General 4 2.1 Components .4 2.2 Units of measurement .5 2.3 Unda

15、ted references .5 3 Glossary .5 4 Unit Assemblies 6 CONSTRUCTION 5 Assembly 6 6 Materials .7 7 Bodies .8 8 Springs 9 9 Diaphragms 9 10 Marked Set Pressure .9 PERFORMANCE 11 General 10 12 Deformation Test .10 13 External Leakage Test 11 14 Hydrostatic Strength Test 12 15 Bending Test .12 16 Start-To-

16、Discharge/Resealing Pressures of Safety Valves Test No. 1 .12 17 Flow Capacity of Safety Valves Test No. 2 .13 18 Recheck Start-To-Discharge/Resealing Pressures of Safety Valves Test No. 3 .15 19 Time Test of Safety Relief Valves Test No. 4 .16 20 Start-To-Discharge/Resealing Pressures of Hydrostati

17、c Relief Valves Test No. 5 .16 21 Exposure to Ultraviolet Light Test .16 22 Moist Ammonia Air Stress Cracking Test Test No. 6A .17 23 Volume Change/Weight Loss of Rubber Parts Test No. 7 17 24 LP-Gas Compatibility Tests 18 25 Accelerated Aging of Rubber Parts Test No. 8 18 26 Accelerated-Aging Test

18、18 MANUFACTURING AND PRODUCTION TESTS 27 General 18 MARKING 28 General 19 JUNE 30, 2015 SAFETY RELIEF VALVES FOR ANHYDROUS AMMONIA AND LP-GAS - UL 132 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INTRODUCTION 1 Scope 1.1 These requiremen

19、ts cover pressure and safety relief valves and hydrostatic relief valves for anhydrous ammonia and liqueed petroleum gas (LP-Gas) for use on containers built in accordance with ASME Pressure Vessel Code, Section VIII, Division 1 in nonrefrigerated systems in facilities covered by the following stand

20、ards: a) Requirements for the Storage and Handling of Anhydrous Ammonia, ( ANSI K61.1), ANSI/ CGA G-2.1. b) Liqueed Petroleum Gas Code, NFPA 58. c) Utility LP-Gas Plant Code, NFPA 59. 1.2 These requirements do not apply to relief valves for use on cylinders constructed in accordance with Department

21、of Transportation (DOT) specications. 2 General 2.1 Components 2.1.1 Except as indicated in 2.1.2, a component of a valve covered by this standard shall comply with the requirements for that component. 2.1.2 A component is not required to comply with a specic requirement that: a) Involves a feature

22、or characteristic not required in the application of the component in the product covered by this standard, or b) Is superseded by a requirement in this standard. 2.1.3 A component shall be used in accordance with its rating established for the intended conditions of use. 2.1.4 Specic components are

23、 incomplete in construction features or restricted in performance capabilities. Such components are intended for use only under limited conditions, such as certain temperatures not exceeding specied limits, and shall be used only under those specic conditions. JUNE 30, 2015 SAFETY RELIEF VALVES FOR

24、ANHYDROUS AMMONIA AND LP-GAS - UL 132 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 2.2 Units of measurement 2.2.1 Values stated without parentheses are the requirement. Values in parentheses are explanatory or approximate information. 2.

25、3 Undated references 2.3.1 Any undated reference to a code or standard appearing in the requirements of this standard shall be interpreted as referring to the latest edition of that code or standard. 3 Glossary 3.1 FLOW CAPACITY (Measured Relieving Capacity) The ow capacity of a safety valve measure

26、d at the ow-rating pressure, expressed in cubic feet per minute of air at a temperature of 15.6C (60F) and at a pressure of 14.7 pounds per square inch absolute (psia). 3.2 PRESSURE, BLOWDOWN The value of decreasing inlet static pressure at which no further discharge is detected at the outlet of a s

27、afety valve of the resilient-disc type after the valve has been subjected to a pressure equal to or above the popping pressure. 3.3 PRESSURE, FLOW RATING The inlet static pressure at which relieving capacity of a safety valve is measured for rating purposes. 3.4 PRESSURE, POPPING The value of increa

28、sing inlet static pressure at which the disc moves in the opening direction at a faster rate as compared with corresponding movement at higher or lower pressures. It applies only to safety valves on compressible uid service. 3.5 PRESSURE, RESEALING The value of decreasing inlet static pressure at wh

29、ich leakage ceases through a specied water seal on the outlet of a pressure-relief valve after the valve has been subjected to a pressure above the start-to-discharge pressure, but below the popping pressure. It applies only to relief valves of the resilient-disc type. 3.6 PRESSURE, SET The value of

30、 increasing inlet static pressure at which a pressure-relief valve displays the operational characteristic dened under start-to-discharge pressure. 3.7 PRESSURE, START-TO-DISCHARGE The value of increasing inlet static pressure at which the rst bubble occurs when a pressure-relief valve of the resili

31、ent-disc type is tested by means of air under a specied water seal on the outlet. 3.8 VALVE, HYDROSTATIC RELIEF A pressure-relief valve actuated by hydrostatic inlet pressure that opens in proportion to the increase in pressure over the opening pressure. 3.9 VALVE, PRESSURE RELIEF A valve designed t

32、o open by inlet static pressure and to reclose and prevent the further ow of uid after normal conditions have been restored. 3.10 VALVE, SAFETY RELIEF A pressure-relief valve actuated by inlet static pressure and characterized by rapid opening or pop action. JUNE 30, 2015 SAFETY RELIEF VALVES FOR AN

33、HYDROUS AMMONIA AND LP-GAS - UL 132 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 4 Unit Assemblies 4.1 A safety valve may be furnished separately, threaded into, or made integral with the assembly of a multiple-head unit or a manifold. W

34、hen a safety valve is furnished as a separate unit, the assigned ow capacity applies only when it is mounted in a straight coupling or the equivalent in the top of the tank, and no restriction to ow is introduced on either the inlet or outlet side of the valve. Installation, otherwise, normally intr

35、oduces restriction to ow that reduces the ow capacity. 4.2 When a safety valve is: a) Installed in a multiple-head unit or manifold other than one with which the valve was ow- tested and rated, b) Used with vapor tubes, c) Mounted in a tting in such a manner as to introduce restriction to ow ahead o

36、f the valve inlet, or d) Mounted so that the ow is restricted on the discharge side by the use of vent piping and ttings, the assigned ow capacity does not apply. The ow tests shall be conducted under such conditions of installation to determine the ow capacity. CONSTRUCTION 5 Assembly 5.1 A safety

37、relief valve shall be of the direct spring-loaded resilient-seat disc or seal construction and shall be characterized by pop action upon opening. 5.2 A hydrostatic relief valve shall be of the direct spring-loaded resilient-seat disc or seal construction, but is not required to be characterized by p

38、op action. 5.3 A valve shall include all of the components required for its intended function and installation and shall be assembled as a single unit. 5.4 A seat disc or seal shall be securely attached to its poppet or holder so that it is not possible for the disc or seal to become dislocated unde

39、r service conditions. 5.5 The outlet of a pilot valve or a pilot valve incorporating a vent shall be constructed to reduce the risk of inoperability due to ice formation or clogging. 5.6 Shut-off valves incorporated in the construction of a Safety Relief Valve shall be evaluated to the Standard for

40、Safety for Flow Control Valves for Anhydrous Ammonia and LP-Gas, UL 125. JUNE 30, 2015 SAFETY RELIEF VALVES FOR ANHYDROUS AMMONIA AND LP-GAS - UL 132 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 6 Materials 6.1 An operating or uid-connin

41、g part of a valve shall have the strength and durability to provide reliable service of the part and of the assembly, when failure of the part is capable of allowing leakage or risk of re or injury. 6.2 A part in contact with the uid to be handled shall be resistant to the action of such uid. Ammoni

42、a containing minute quantities of water reacts rapidly with copper, zinc, and many alloys, especially those of copper base. 6.3 A part used for a body or closure shall have a melting point of no less than 1500F (816C), a tensile strength of no less than 30,000 psi (206.7 MPa), and an elongation of n

43、o less than 10 percent in 2 inches (50.8 mm). Exception: An alloy equivalent to Specication 6061T6 for aluminum, in accordance with the Alloy and Temper Designation Systems for Aluminum, ANSI H35.1/H35.1M, is not prohibited from being used for anhydrous ammonia valves. 6.4 Nonductile cast iron (regu

44、lar gray iron) shall not be used for a body or closure in contact with anhydrous ammonia and LP-Gas. Malleable iron, ductile iron, and cast steel conforming with or exceeding the specications for such materials as specied in the following standards, respectively, are not prohibited from being used f

45、or anhydrous ammonia and LP-Gas valves: a) Standard Specication for Ferritic Malleable Iron Castings, ASTM A47/A47M-99 (2014); b) Standard Specication for Ferritic Ductile Iron Pressure-Retaining Castings for Use at Elevated Temperatures, ASTM A395/A395M-99 (2014); and c) Standard Specication for St

46、eel Castings, Carbon, for General Application, ASTM A27/ A27M-13. 6.5 When corrosion of a ferrous part interferes with the intended function of a valve, the part shall be provided with a corrosion-resistant protective coating. 6.6 A protective coating shall provide resistance against corrosion to a

47、degree no less than that provided by the protective coatings specied in 6.7. 6.7 Cadmium plating shall have a thickness of no less than 0.0003 inch (0.008 mm), and zinc plating shall have a thickness of no less than 0.0005 inch (0.013 mm). Exception: On parts where threads constitute the major porti

48、on of the area, the thickness of the cadmium or zinc plating shall not be less than 0.00015 inch (0.0038 mm). 6.8 When warpage of a casting affects the tightness of liquid-conning joints, or the proper t of parts, the casting shall be stress relieved to reduce the possibility of warpage to a minimum

49、. JUNE 30, 2015 SAFETY RELIEF VALVES FOR ANHYDROUS AMMONIA AND LP-GAS - UL 132 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 6.9 A part made of drawn brass or machined from brass rod shall be subjected to the Moist Ammonia Air Stress Cracking Test Test No. 6A, Section 22. 6.10 A seat disc or seal material shall not have a tendency to adhere to the seat. See the Time Test of Safety V