1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 51 Power-Operated Pumps and Bypass Valves for Anhydrous Ammonia, LP-Gas, and PropyleneUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM
2、ULUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Power-Operated Pumps and Bypass Valves for Anhydrous Ammonia, LP-Gas, and Propylene, UL 51 Tenth Edition, Dated May 31, 2013 Summary of Topics This revision of ANSI
3、/UL 51 is being issued to revise the pressure marking in 25.2. The effective date for UL LLC will be announced through Industry File Review Announcement Letter. The revised requirements are substantially in accordance with Proposal(s) on this subject dated January 16, 2015. Text that has been change
4、d in any manner or impacted by ULs electronic publishing system is marked with a vertical line in the margin. 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
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6、ial, indirect or similar damages, including loss of prots, lost savings, loss of data, or any other 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 liabili
7、ty for any damage ever exceed the price paid for this Standard, regardless of the form of the claim. 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 reas
8、onable attorneys fees) resulting from any error or deviation introduced while purchaser is storing an electronic Standard on the purchasers computer system. MAY 18, 2015 UL 51 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL MAY 18, 2015 U
9、L 51 tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL May 31, 2013 (Title Page Reprinted: May 18, 2015) 1 UL 51 Standard for Power-Operated Pumps and Bypass Valves for Anhydrous Ammonia, LP-Gas, and Propylene The rst e
10、dition was titled Power-Operated Pumps for LP-Gas. The second, third, and fourth editions were titled Pumps for Anhydrous Ammonia and LP-Gas. The fth, sixth, seventh, eighth, and ninth editions were titled Power-Operated Pumps for Anhydrous Ammonia and LP-Gas. First Edition March, 1956 Second Editio
11、n September, 1959 Third Edition November, 1969 Fourth Edition September, 1972 Fifth Edition September, 1974 Sixth Edition March, 1980 Seventh Edition October, 1992 Eighth Edition November, 1995 Ninth Edition November, 2002 Tenth Edition May 31, 2013 This ANSI/UL Standard for Safety consists of the t
12、enth edition including revisions through May 18, 2015. The most recent designation of ANSI/UL 51 as an American National Standard (ANSI) occurred on May 18, 2015. ANSI approval for a standard does not include the Cover Page, Transmittal Pages, Title Page, or effective date information. Comments or p
13、roposals for revisions on any part of the Standard may be submitted 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 cop
14、y of a Standard should be altered in any way. All of ULs Standards 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 51-2015UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER
15、REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL MAY 31, 2013 UL 51 2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS INTRODUCTION 1 Scope .5 2 Components 6 3 Units of Measurement .6 4 Undated References 7
16、 5 Glossary .7 CONSTRUCTION 6 Assembly 7 7 Materials .8 8 Bodies, Covers, and Heads .10 9 Strainers 10 10 Springs 11 11 Pumps and Bypass Valves Pressure Ratings 11 12 Relief Valves .11 13 Guards 12 14 Pipe Connections .12 PERFORMANCE 15 General 12 16 Deformation Test .13 17 Leakage Test 13 18 Endura
17、nce Test 14 19 Differential Pressure Test 14 20 Hydrostatic Strength Test 15 21 Moist Ammonia Air Stress Cracking Test 15 22 Tests for Synthetic Rubber Parts .16 22.1 General .16 22.2 Volume change test 16 22.3 Weight loss test 17 23 Comparative Corrosion Tests 18 23.1 General .18 23.2 Tests in the
18、presence of salt spray (fog) 18 23.3 Tests in the presence of moist hydrogen sulde-air mixture .18 23.4 Tests in the presence of moist sulfur dioxide-carbon dioxide-air mixture .19 MANUFACTURING AND PRODUCTION TESTS 24 General 19 MARKINGS 25 Details .20 INSTALLATION AND OPERATING INSTRUCTIONS 26 Det
19、ails .21 MAY 31, 2013 UL 51 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL APPENDIX A Standards for ComponentsA1 MAY 31, 2013 UL 51 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL
20、 INTRODUCTION 1 Scope 1.1 These requirements cover power-operated pumps and bypass valves for use in liquid transfer operations in non-refrigerated systems in installations for: a) Anhydrous ammonia systems installed in accordance with the Safety Requirements for the Storage and Handling of Anhydrou
21、s Ammonia, CGA/GAS G-2.1 (ANSI K61.1); b) Liqueed petroleum gas (LP-Gas) systems installed in accordance with the Liqueed Petroleum Gas Code, NFPA No. 58; and c) Propylene systems. 1.2 These requirements do not cover: a) Pumps or compressors intended for handling anhydrous ammonia or LP-Gas or propy
22、lene in the gaseous phase and b) Pumps, compressors or bypass valves for anhydrous ammonia, LP-Gas, or propylene for use in chemical, petro-chemical, petroleum, or utility power plants; nor pipeline or marine terminals; nor related storage facilities at such plants or terminals. 1.3 Equipment covere
23、d by these requirements is for use with LP-Gas, propylene, or anhydrous ammonia as covered by the Standards and Codes in 1.1 and shall have a minimum service pressure rating in accordance with Table 1.1. Exception: A pump without an integral bypass valve with a higher differential pressure obtained
24、in the Differential Pressure Test, Section 17, is permitted to have a lower minimum service pressure rating if it is marked in accordance with 25.2. Table 1.1 Minimum service pressure for rating pumps and bypass valves Maximum differential pressure produced when subjected to the Differential Pressur
25、e Test, Section 17 Anhydrous ammonia and LP-Gas equipment minimum service pressure rating Propylene equipment minimum service pressure rating psig (kPa) psig (kPa) psig (kPa) 100 (689) Propylene equipment only Not applicable 350 (2415) 125 (862) 350 (2415) 375 (2585) 125 (863) 150 (1034) 375 (2586)
26、400 (2758) 150 (1034) 200 (1379) 400 (2758) 425 (2930) 200 (1379) 200 + differential pressure produced (1379 + differential pressure produced) 225 + differential pressure produced (1551 + differential pressure produced) MAY 31, 2013 UL 51 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCT
27、ION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 2 Components 2.1 Except as indicated in 2.2, a component of a product covered by this standard shall comply with the requirements for that component. See Appendix A for a list of standards covering components generally used in the products covered by th
28、is standard. 2.2 A component is not required to comply with a specic requirement that: a) Involves a feature 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. 2.3 A component shall be use
29、d in accordance with its rating established for the intended conditions of use. 2.4 Specic components are 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 spec
30、ied limits, and shall be used only under those specic conditions. 2.5 Electrical components, including motors and wiring, when incorporated by a manufacturer in the assembly of a pump for LP-Gas or propylene, and the means provided in the pump assembly for electrical connections, shall comply with t
31、he requirements for equipment for use in hazardous locations, Class I, Group D, in the National Electrical Code, NFPA 70, Articles 500 and 501. 2.6 Electrical components, including motors and wiring and connections shall comply with the requirements for equipment for use in hazardous locations, Clas
32、s I, Group D, in the National Electrical Code, NFPA 70, Articles 500 and 501. Exception: When incorporated by a manufacturer in the assembly of a pump for anhydrous ammonia, the above described electrical components need only to comply with the requirements for ordinary (nonhazardous) locations or f
33、or outdoor use locations, if the assembly is appropriately marked to designate the limitations in location and use involved with the electrical features. 3 Units of Measurement 3.1 Values stated without parentheses are the requirement. Values in parentheses are explanatory or approximate information
34、. MAY 31, 2013 UL 51 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 4 Undated References 4.1 Any undated reference to a code or standard appearing in the requirements of this standard shall be interpreted as referring to the latest edition
35、 of that code or standard. 5 Glossary 5.1 For the purpose of this standard the following denitions apply. 5.2 BYPASS VALVE A valve used on the discharge side of a pump which opens automatically at a predetermined differential pressure so as to direct part or all of the pump discharge back to the sup
36、ply tank. It is either provided as part of a pump assembly (integral bypass valve), or it is a separate valve which is piped into the pump discharge system at the time of installation. 5.3 LIQUEFIED PETROLEUM GAS (LP-GAS OR LPG) Any material having a vapor pressure not exceeding that allowed for com
37、mercial propane, as dened in Standard Specication for Liqueed Petroleum (LP) Gases, ASTM D1835, that is composed predominantly of the following hydrocarbons, either by themselves (excluding propylene) or as mixtures: propane, propylene, butane (normal butane or isobutane) and butylenes. 5.4 RELIEF V
38、ALVE A recirculating valve which opens at a predetermined differential pressure to direct the pump discharge back to the intake side of the pump. When provided, it is included as part of the pump assembly. CONSTRUCTION 6 Assembly 6.1 The construction of a pump or bypass valve shall be such that part
39、s are capable of being assembled in the required manner after being dismantled to the extent needed for replacement of parts or for other care or servicing. 6.2 Screws or bolts used to attach parts which are detached for care or servicing of the pump or bypass valve shall be capable of holding upon
40、the application of the torques indicated in Table 6.1 after removal and replacement. MAY 31, 2013 UL 51 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Table 6.1 Maximum torque requirements for screws or bolts American standard screw I.S.O.
41、 screw Screw size, Torque, Screw size, Torque, No. inch (mm) lb-in (Nm) mm Nm (lb-in) 41 . 61 4 8 4.2 18 2.0 4.5 2.6 23 10 4.8 30 3.4 5 4.2 37 1/4 6.4 100 11.3 6 8.7 77 7 15.0 133 5/16 7.9 200 22.6 8 23.5 208 9 33.6 297 3/8 9.5 350 39.6 10 45.2 400 7/16 11.1 575 65.0 12 81.0 715 1/2 12.7 850 96.0 14
42、 128.0 1130 9/16 14.3 1200 136.0 5/8 15.9 1600 181.0 16 185.0 1640 6.3 When a base is furnished as part of a pump assembly, it shall be arranged to permit intended attachment and alignment of mounted parts and for anchoring to a mounting surface by cap screws or bolts. 7 Materials 7.1 A metal part u
43、sed for bodies or closures shall be inherently resistant to the action of the liquid to be handled. Other parts in contact with the liquid to be handled shall be resistant to the action of such liquid. 7.2 The common metals are not attacked by dry ammonia. Zinc, copper, and copper base alloys, such
44、as brass, are subject to rapid destructive action by ammonia in the presence of water and shall not be used. 7.3 A material used to prevent external leakage, except a seal ring or a gasket, shall have a melting point (solidus temperature) of not less than 940C (1724F). 7.4 Bodies or closures in cont
45、act with the liquid to be handled shall be of material specied in Table 7.1, or what is determined to be the equivalent. MAY 31, 2013 UL 51 8UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Table 7.1 Materials for enclosures Material type Cri
46、teria for determining compliance Steel Ductile (modular) iron ASTM A395 a or A536 b , Grade 60-40-18 or 65-45-12 Malleable iron ASTM A47/A47M c High strength gray iron ASTM A48/A48M d , Class 40B; or ASTM A126 e , Class B or C Brass or bronze (for use with LP-gas or propylene only) a ASTM A395, Stan
47、dard Specication for Ferritic Ductile Iron Pressure-Retaining Castings for Use at Elevated Temperatures. b ASTM A536, Standard Specication for Ductile Iron Castings. c ASTM A47/A47M, Standard Specication for Ferritic Malleable Iron Castings. d ASTM A48/A48M, Standard Specication for Gray Iron Castin
48、gs. e ASTM A126, Standard Specication for Gray Iron Castings for Valves, Flanges, and Pipe Fittings. 7.5 A brazing material used in joining liquid-conning parts of a pump or bypass valve for LP-Gas or propylene shall have a melting point (solidus temperature) of not less than 940C (1724F). Brazing s
49、hall not be used on a pump or bypass valve for anhydrous ammonia. See 7.2. 7.6 A body casting of a pump or bypass valve shall be free from porosity leakage. and shall have a wall thickness of not less than that specied in Table 7.2. Table 7.2 Wall thickness of body castings Material type Minimum wall thickness, inch (mm) High-strength gray iron 1/4 6.4 Malleable iron, ductile iron, or cast steel 3/16 4.8 Brass or bronze (for use with
