1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 25 Meters for Flammable and Combustible Liquids and LP-Gas STANDARD FOR SAFETYUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COP
2、YRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Meters for Flammable and Combustible Liquids and LP-Gas, UL 25 Ninth Edition, Dated April 19, 2016 SUMMARY OF TOPICS This revision of ANSI/UL 25 is being issued to add torq
3、ue requirements for larger size valve. The revisions are substantially in accordance with Proposal(s) on this subject dated August 26, 2016. Text that has been changed in any manner or impacted by ULs electronic publishing system is marked with a vertical line in the margin. All rights reserved. No
4、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 any kind, either expressed or implied, i
5、ncluding 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 other damages arising out of the use of
6、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 claim. Users of the electronic versions
7、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 storing an electronic Standard on the purch
8、asers computer system. OCTOBER 7, 2016 UL 25 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL OCTOBER 7, 2016 UL 25 tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION
9、FROM UL APRIL 19, 2016 (Title Page Reprinted: October 7, 2016) 1 UL 25 Standard for Meters for Flammable and Combustible Liquids and LP-Gas The rst edition was titled Liquid-Phase Meters for LP-Gas. The second through fourth editions were titled Meters for Flammable Liquids and LP-Gas. First Edition
10、 March, 1956 Second Edition April, 1959 Third Edition June, 1968 Fourth Edition December, 1973 Fifth Edition June, 1979 Sixth Edition September, 1990 Seventh Edition May, 1996 Eighth Edition January, 2003 Ninth Edition April 19, 2016 This ANSI/UL Standard for Safety consists of the Ninth Edition inc
11、luding revisions through October 7, 2016. The most recent designation of ANSI/UL 25 as an American National Standard (ANSI) occurred on October 7, 2016. ANSI approval for a standard does not include the Cover Page, Transmittal Pages and Title Page. Comments or proposals for revisions on any part of
12、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 https:/. ULs Standards for Safety are copyrighted by UL. Neither a printed nor electronic copy of a Standard should be altered in
13、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 2016 UNDERWRITERS LABORATORIES INC. ANSI/UL 25-2016UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT
14、PERMISSION FROM UL APRIL 19, 2016 METERS FOR FLAMMABLE AND COMBUSTIBLE LIQUIDS AND LP-GAS - UL 25 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 5 2.1 Components .5 2.2 Units
15、of measurement .5 2.3 Undated references .5 CONSTRUCTION 3 General 5 4 Assembly 6 5 Materials .6 6 Bodies and Covers 8 7 Register-Shaft Seals 9 8 Springs 9 9 Piping and Fittings 9 PERFORMANCE 10 General 11 11 Deformation Test .11 12 Leakage Test 12 13 Endurance Test 13 14 Hydrostatic Strength Test 1
16、3 15 Temperature Reduction Test .14 16 Moist Ammonia-Air Stress Cracking Test 14 MANUFACTURING AND PRODUCTION TESTS 17 General 14 MARKING 18 General 15 19 Permanence of Marking .16 APPENDIX A Standards for Components .A1 APRIL 19, 2016 METERS FOR FLAMMABLE AND COMBUSTIBLE LIQUIDS AND LP-GAS - UL 25
17、3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INTRODUCTION 1 Scope 1.1 These requirements cover positive displacement liquid meters for: a) Flammable and combustible liquids of the type and size commonly used in the assembly of motor fuel
18、 dispensing devices and b) Liqueed petroleum gas (LP-Gas) of the type and size commonly used in the assembly of motor fuel dispensing devices and tank trucks. 1.2 Flammable and Combustible Liquids, as used herein, means gasoline, gasoline/alcohol blends up to 15% Ethanol or 15% Methanol, diesel fuel
19、, fuel oil, lubricating oil, kerosene, and the vapors of these fuels. Other petroleum products are not prohibited from being used in the meter when the materials comply with the requirements in Materials, Section 5, and when the meter is evaluated using the additional liquids. Petroleum products sha
20、ll be handled at pressures not exceeding 50 pounds per square inch gauge (psig) (345 kPa) and at temperatures within the range of minus 29C (20F) 52C (125F). 1.3 Flammable and combustible liquid meters covered by this standard are for use in accordance with the National Fire Protection Associations
21、Flammable and Combustible Liquids Code, NFPA 30, and the Code for Motor Fuel Dispensing Facilities and Repair Garages, NFPA 30A. 1.4 LP-Gas meters covered by this standard are for use in nonrefrigerated systems in accordance with the National Fire Protection Associations Liqueed Petroleum Gas Code,
22、NFPA 58. 1.5 These requirements do not cover: a) Meters for use with liqueed petroleum gas in the gaseous phase; b) Velocity meters, head meters, or area meters; c) Meters for use in centralized fuel oil distribution systems; and d) Meter components incorporating electrical circuits except those mee
23、ting intrinsically safe or explosion standards. 1.6 Determinations of the suitability of registers, counters, or computers used or provided with these meters, or the accuracy of measurement resulting from or required in actual application are not within the scope of these requirements. APRIL 19, 201
24、6 METERS FOR FLAMMABLE AND COMBUSTIBLE LIQUIDS AND LP-GAS - UL 25 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 2 General 2.1 Components 2.1.1 Except as indicated in 2.1.2, a component of a product covered by this standard shall comply wi
25、th the requirements for that component. See Appendix A for a list of standards covering components used in the products covered by this standard. 2.1.2 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
26、 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 incomplete in construction features or restricted in pe
27、rformance 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. 2.2 Units of measurement 2.2.1 Values stated without parentheses are the requirement. Values in
28、 parentheses are explanatory or approximate information. 2.3 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. CONSTRUCTION 3 General 3.1 A meter design
29、ed to handle ammable and combustible liquids shall be constructed for a minimum working pressure of 345 kPa (50 psig), and an ultimate rupture pressure of not less than ve times the rated working pressure. 3.2 A meter designed to handle LP-Gas shall be constructed for a minimum working pressure of 2
30、408 kPa (350 psig), and an ultimate rupture pressure of not less than ve times the rated working pressure. APRIL 19, 2016 METERS FOR FLAMMABLE AND COMBUSTIBLE LIQUIDS AND LP-GAS - UL 25 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 4 Asse
31、mbly 4.1 A meter shall be assembled as a unit and shall include all of the components necessary for its intended function. 4.2 If a meter requires the use of special pipe anges, gaskets, bolts, or other special ttings or parts for making a proper installation, such parts shall be furnished by the ma
32、nufacturer with each meter. 4.3 A brazing material used for joining uid-conning parts of a meter shall have a melting point (solidus temperature) exceeding 538C (1000F). 5 Materials 5.1 A part in contact with the uid to be handled shall be resistant to the action of such uid. 5.2 Except as indicated
33、 in 4.3, uid-conning parts, other than a seal ring or a gasket, shall have a minimum melting point (solidus temperature) of 510C (950F) and a minimum tensile strength of 68,950 kPa (10,000 psi) at 204C (400F). 5.3 Fluid conning metal parts of meters for LP-Gas shall be one of the following materials
34、 or the equivalent: a) Steel. b) Ductile (nodular) iron 1) As specied in the Standard Specication for Ferritic Ductile Iron Pressure-Retaining Castings for Use at Elevated Temperatures, ASTM A395/A395M. 2) Grade 60-40-18 or 65-45-12 as specied in the Standard Specication for Ductile Iron Castings, A
35、STM A536. c) Malleable iron as specied in the Standard Specication for Ferritic Malleable Iron Castings, ASTM A47/A47M. d) Class 40B or higher strength gray iron as specied in the Standard Specication for Gray Iron Castings, ASTM A48/A48M. e) Brass. f) Aluminum. 5.4 If atmospheric corrosion of a par
36、t will interfere with the operation of a meter, or permit external leakage, such part shall be of a corrosion-resistant material or be provided with a corrosion-resistant protective coating. Exception: A coating need not be provided for ferrous materials used for uid-conning parts which have the thi
37、ckness specied in the following: a) Castings have a minimum wall thickness of 6.4 mm (1/4 inch), b) Standard pipe and ttings conforming to the Standard for Welded and Seamless Wrought Steel Pipe, ANSI/ASME B36.10M, Schedule 40, and APRIL 19, 2016 METERS FOR FLAMMABLE AND COMBUSTIBLE LIQUIDS AND LP-G
38、AS - UL 25 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL c) Fabricated sheet steel parts having a minimum wall thickness of 2.36 mm (0.093 inch). Also see Section 17 for additional test requirements. 5.5 A protective coating shall provide
39、 resistance against corrosion to a degree not less than that provided by the protective coatings specied in 5.6. 5.6 Cadmium plating shall have a minimum thickness of 0.0076 mm (0.0003 inch), and zinc plating shall have a minimum thickness of 0.0127 mm (0.0005 inch), except on parts where threads co
40、nstitute the major portion of the area, in which case the minimum thickness of the cadmium or zinc plating shall be 0.0038 mm (0.00015 inch). 5.7 Sand castings used in the construction of uid-conning parts, failure of which will allow external leakage, shall be free from porosity leakage and shall h
41、ave a minimum design thickness as specied in Table 5.2. See the Leakage Test, Section 12, and General, Section 17, for additional test requirements. Table 5.2 Minimum thickness of liquid-conning sand castings Material Flammable and combustible liquid meters, LP-Gas meters, mm (inch) mm (inch) Cast i
42、ron 4.8 3/16 6.4 1/4 Malleable iron, ductile iron, or cast steel 3.2 1/8 4.8 3/16 Brass or bronze 2.4 3/32 4.8 3/6 Aluminum 4.0 5/32 6.4 1/4 NOTE Also see 5.3 concerning materials used. 5.8 If warping of a casting affects the tightness of uid-conning joints, or the necessary t of parts, the casting
43、shall be stress-relieved to reduce the possibility of warping to a minimum. 5.9 A liquid-conning transparent part provided for purposes of observation shall be of glass. It shall be protected against damage by recessing or guarding. The glass part shall not be adversely affected by changes in temper
44、ature. See the Temperature Reduction Test, Section 15. 5.10 For at anges, a plant ber gasket shall be not more than 0.8 mm (1/32 inch) thick. A cork-composition gasket shall be shellacked in place on one side and coated with graphite on the other. Synthetic rubber gaskets shall have a minimum thickn
45、ess of 1.6 mm (1/16 inch) and a maximum thickness of 2.4 mm (3/32 inch). 5.11 An elastomeric part used in contact with liquid shall have the following properties when tested as specied in the Standard for Gasket and Seals, UL 157. a) Those properties relating to minimum tensile strength and elongati
46、on after oven aging, as specied in UL 157. The maximum service temperature used to determine the conditioning time and temperature for oven aging is determined to be 60C (140F), unless the product is designated for use at higher temperature. b) Low temperature rating of minus 29C (minus 20F). APRIL
47、19, 2016 METERS FOR FLAMMABLE AND COMBUSTIBLE LIQUIDS AND LP-GAS - UL 25 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL c) Volume change and extraction as specied in the requirements for UL 157, for end use applications of gasoline, gasoli
48、ne/alcohol blends up to 15% Ethanol or 15% Methanol, diesel fuel, fuel oil, lubricating oil and kerosene for meters handling ammable and combustible liquids and for end use applications of LP-Gas for meters handling LP-Gas. Other end use applications shall use the uids intended for exposure. 5.12 Th
49、e Standard for Gasket and Seals, UL 157, provides for the testing of either nished elastomeric parts, or sheet or slab material. Sheet or slab material is to be tested when the elastomeric parts are O-rings having a diameter less than 25.4 mm (1 inch). The material tested is to be the same as that used in the product, regardless of whether nished elastomeric parts, or sheet or slab material is tested. 5.13 When the limits for tensile strength and el
