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 new edition of ANSI/UL 25 is being issued to revis
3、e the Moist Ammonia-Air Stress Cracking Test. The revisions are substantially in accordance with Proposal(s) on this subject dated February 19, 2016. 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,
4、 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, including but not limited to, the implied warranties of merchantability or tness for any purpose. In no event will UL be liable
5、 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 or the inability to use this Standard, even if UL or an authorized UL representative has been advised of the possibility of su
6、ch 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 of ULs Standards for Safety agree to defend, indemnify, and hold UL harmless from and against any loss, expense, liability, da
7、mage, claim, or judgment (including reasonable attorneys fees) resulting from any error or deviation introduced while purchaser is storing an electronic Standard on the purchasers computer system. APRIL 19, 2016 UL 25 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION
8、 WITHOUT PERMISSION FROM UL APRIL 19, 2016 UL 25 tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL APRIL 19, 2016 1 UL 25 Standard for Meters for Flammable and Combustible Liquids and LP-Gas The rst edition was titled L
9、iquid-Phase Meters for LP-Gas. The second through fourth editions were titled Meters for Flammable Liquids and LP-Gas. First Edition March, 1956 Second Edition April, 1959 Third Edition June, 1968 Fourth Edition December, 1973 Fifth Edition June, 1979 Sixth Edition September, 1990 Seventh Edition Ma
10、y, 1996 Eighth Edition January, 2003 Ninth Edition April 19, 2016 This ANSI/UL Standard for Safety consists of the Ninth Edition. The most recent designation of ANSI/UL 25 as an American National Standard (ANSI) occurred on April 19, 2016. ANSI approval for a standard does not include the Cover Page
11、, Transmittal Pages and Title Page. Comments or proposals 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 copyri
12、ghted by UL. Neither a printed nor electronic copy 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 2016 UNDERWRITERS LABORATORIES INC. ANSI/UL 25-2016UL
13、 COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT 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 PERMIS
14、SION FROM UL CONTENTS INTRODUCTION 1 Scope .4 2 General 5 2.1 Components .5 2.2 Units 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 Defor
15、mation Test .11 12 Leakage Test 12 13 Endurance Test 13 14 Hydrostatic Strength Test 13 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 Componen
16、ts .A1 APRIL 19, 2016 METERS FOR FLAMMABLE AND COMBUSTIBLE LIQUIDS AND LP-GAS - UL 25 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 an
17、d combustible liquids of the type and size commonly used in the assembly of motor fuel 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,
18、means gasoline, gasoline/alcohol blends up to 15% Ethanol or 15% Methanol, diesel fuel, 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
19、, and when the meter is evaluated using the additional liquids. Petroleum products shall 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 t
20、his standard are for use in accordance with the National Fire Protection Associations 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
21、accordance with the National Fire Protection Associations Liqueed Petroleum Gas Code, 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 distributi
22、on systems; and d) Meter components incorporating electrical circuits except those meeting 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 requir
23、ed in actual application are not within the scope of these requirements. APRIL 19, 2016 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
24、 indicated in 2.1.2, 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 used in the products covered by this standard. 2.1.2 A component is not required to comply with a specic requiremen
25、t 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. 2.1.3 A component shall be used in accordance with its rating established for the intended conditions of us
26、e. 2.1.4 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 specied limits, and shall be used only under those specic conditions. 2.2 Units
27、 of measurement 2.2.1 Values stated without parentheses are the requirement. Values in 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
28、the latest edition of that code or standard. CONSTRUCTION 3 General 3.1 A meter designed 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 me
29、ter designed to handle LP-Gas shall be constructed for a minimum working pressure of 2408 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
30、 AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 4 Assembly 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 tti
31、ngs or parts for making a proper installation, such parts shall be furnished by the manufacturer 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 u
32、id to be handled shall be resistant to the action of such uid. 5.2 Except as indicated 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
33、Fluid conning metal parts of meters for LP-Gas shall be one of the following materials 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
34、-40-18 or 65-45-12 as specied in the Standard Specication for Ductile Iron Castings, ASTM 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
35、 Castings, ASTM A48/A48M. e) Brass. f) Aluminum. 5.4 If atmospheric corrosion of a part 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 ne
36、ed not be provided for ferrous materials used for uid-conning parts which have the thickness 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,
37、 Schedule 40, and APRIL 19, 2016 METERS FOR FLAMMABLE AND COMBUSTIBLE LIQUIDS AND LP-GAS - 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 s
38、ee Section 17 for additional test requirements. 5.5 A protective coating shall provide 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
39、 have a minimum thickness of 0.0127 mm (0.0005 inch), except on parts where threads constitute 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
40、 of which will allow external leakage, shall be free from porosity leakage and shall have 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 Mater
41、ial Flammable and combustible liquid meters, LP-Gas meters, mm (inch) mm (inch) Cast iron 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
42、affects the tightness of uid-conning joints, or the necessary t of parts, the casting 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 rece
43、ssing or guarding. The glass part shall not be adversely affected by changes in temperature. 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 c
44、oated with graphite on the other. Synthetic rubber gaskets shall have a minimum thickness 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 an
45、d Seals, UL 157. a) Those properties relating to minimum tensile strength and elongation 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
46、 use at higher temperature. b) Low temperature rating of minus 29C (minus 20F). APRIL 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 a
47、s specied in the requirements for UL 157, for end use applications of gasoline, gasoline/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 handlin
48、g LP-Gas. Other end use applications shall use the uids intended for exposure. 5.12 The 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
49、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 elongation, volume change, or extraction specied in 5.11 are exceeded, the gasket material may be retested in the complete meter after conditioning as outlined in 5.14 5.16. 5.14 When the limits for tensile strengt
