1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 25A Meters for Gasoline and Gasoline/Ethanol Blends with Nominal Ethanol Concentrations up to 85 Percent (E0 - E85)UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBU
2、TION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Meters for Gasoline and Gasoline/Ethanol Blends with Nominal Ethanol Concentrations up to 85 Percent (E0 - E85), UL 25A First Edition,
3、Dated July 30, 2014 Summary of Topics This revision of ANSI/UL 25A revises the material requirements for static seals. The revised requirements are substantially in accordance with Proposal(s) on this subject dated November 7, 2014. All rights reserved. No part of this publication may be reproduced,
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6、 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 of ULs Standards for Safety agree to defend
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8、this Standard are now in effect, except for those paragraphs, sections, tables, gures, and/or other elements of the Standard having future effective dates as indicated in the note following the affected item. The prior text for requirements that have been revised and that have a future effective dat
9、e are located after the Standard, and are preceded by a SUPERSEDED REQUIREMENTS notice. JANUARY 21, 2015 UL 25A tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL JANUARY 21, 2015 UL 25A tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AU
10、THORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL July 30, 2014 (Title Page Reprinted: January 21, 2015) 1 UL 25A Standard for Meters for Gasoline and Gasoline/Ethanol Blends with Nominal Ethanol Concentrations up to 85 Percent (E0 - E85) Prior to the rst edition, the requ
11、irements for the products covered by this standard were included in the Outline of Investigation for Meters for Gasoline and Gasoline/Ethanol Blends with Nominal Ethanol Concentrations up to 85 Percent (E0 - E85), UL 25A. First Edition July 30, 2014 This ANSI/UL Standard for Safety consists of the F
12、irst Edition including revisions through January 21, 2015. The most recent designation of ANSI/UL 25A as an American National Standard (ANSI) occurred on January 21, 2015. ANSI approval for a standard does not include the Cover Page, Transmittal Pages, Title Page, or effective date information. Comm
13、ents 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 copyrighted by UL. Neither a printed nor elect
14、ronic 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 2015 UNDERWRITERS LABORATORIES INC. ANSI/UL 25A-2015UL COPYRIGHTED MATERIAL NOT AUTHORIZED FO
15、R FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL JULY 30, 2014 UL 25A 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 General 6 2.1 Components .6 2.2 Units of measurem
16、ent .6 2.3 Undated references .6 3 Glossary .6 CONSTRUCTION 4 General 7 5 Assembly 7 6 Materials .7 6.1 Metallic materials .7 6.2 Nonmetallic materials 10 6.3 Casting impregnation materials 13 6.4 Internal parts .13 6.5 Blending options 13 7 Bodies and Covers .14 8 Register-Shaft Seals .14 9 Springs
17、 .14 10 Piping and Fittings 15 PERFORMANCE 11 General 16 12 Long Term Exposure Test .17 12.1 General .17 12.2 Samples 17 12.3 Method .18 12.4 Results .18 13 High Pressure Leakage Test .19 14 Endurance Test 19 15 Hydrostatic Strength Test .20 16 Deformation Test .20 17 Temperature Reduction Test 21 1
18、8 10-Day Moist Ammonia-Air Stress Cracking Test 21 19 Marking Adhesion Test 21 20 Blending Cycling Test .22 MANUFACTURING AND PRODUCTION 21 General 22 MARKING 22 General 23 23 Permanence of Marking .24 JULY 30, 2014 UL 25A 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUT
19、ION WITHOUT PERMISSION FROM UL SUPPLEMENT SA - Test Fluids SA.1 Details .SA1 JULY 30, 2014 UL 25A 4UL 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 use
20、with motor fuels. Motor fuels, as dened by these requirements, include one or more of the fuels described in 1.2. 1.2 Meters covered by these requirements are intended for use with one or more of the following as applicable: a) Gasoline formulated in accordance with the Standard Specication for Auto
21、motive Spark- Ignition Fuel, ASTM D4814; b) Gasoline/ethanol blends with nominal ethanol concentrations up to 25 percent ethanol (E25), consisting of gasoline formulated in accordance with the Standard Specication for Automotive Spark-Ignition Fuel, ASTM D4814, when blended with denatured fuel ethan
22、ol formulated to be consistent with the Standard Specication for Denatured Fuel Ethanol for Blending With Gasolines For Use as Automotive Spark Ignition Engine Fuel, ASTM D4806; or c) Gasoline/ethanol blends with nominal ethanol concentrations above 25 percent formulated in accordance with the Stand
23、ard Specication in (b) above or formulated in accordance with the Standard Specication for Ethanol Fuel Blends for Flexible-Fuel Automotive Spark Ignition Engines, ASTM D5798. 1.3 Meters covered by this standard are for use in accordance with the National Fire Protection Associations Flammable and C
24、ombustible Liquids Code, ANSI/NFPA 30, and the Code for Motor Fuel Dispensing Facilities and Repair Garages, ANSI/NFPA 30A. 1.4 These requirements do not cover: a) Meters for use with fuels other than as described in 1.2; b) Velocity meters, head meters, or area meters; c) Meters for use in centrali
25、zed fuel oil distribution systems; and d) Meter components incorporating electrical circuits except those meeting intrinsically safe or explosion standards. 1.5 Determinations of the suitability of registers, counters, or computers used or provided with these meters, or the accuracy of measurement r
26、esulting from or required in actual application are not within the scope of these requirements. JULY 30, 2014 UL 25A 5UL 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
27、 a product 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 or characteristic not required in the application of the component in the product covered by this standard, or
28、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 performance capabilities. Such components are intended fo
29、r 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 parentheses are explanatory or approximate information
30、. 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. 3 Glossary 3.1 For the purpose of this standard the following denitions apply. 3.2 BLENDING OPTI
31、ON Dispensing devices may be provided with an option that blends two specic fuels into one fuel to be dispensed. This blending occurs at the dispenser level and can be in two forms: a) Fixed blending Blending at the dispenser level that blends two specic fuels into one fuel to be dispensed, and that
32、 fuel to be dispensed is xed. For example, xed blending includes blend options where gasoline and denatured fuel ethanol can be blended to achieve E85, which is the actual dispensed fuel. b) Variable blending Blending at the dispenser level that blends two specic fuels into the fuel to be dispensed,
33、 but the fuel to be dispensed can be any of a number of previously set points. For example, variable blending includes blend options where gasoline and E85 can be blended to achieve E40, E60, and E85 as the actual dispensed fuel. 3.3 GASOLINE/ETHANOL BLENDS Blended fuels composed of a gasoline compo
34、nent and an ethanol component. The numerical value corresponding to the ethanol component determines the blend rating (such as E85 for 85% ethanol, 15% gasoline). JULY 30, 2014 UL 25A 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 3.4 SEAL
35、S, DYNAMIC A seal that is subject to mechanical movement or other applied forces that result in movement or exing of the seal under normal use conditions. 3.5 SEALS, STATIC A seal that is not subject to mechanical movement or other applied forces other than compression forces that are applied during
36、 installation and maintained during normal use conditions. CONSTRUCTION 4 General 4.1 A meter 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. 4.2 Fluid conning parts, except gaskets and s
37、eals, shall be constructed of metallic materials. 4.3 A meter shall be constructed for an operating ambient temperature within the range of minus 29C to 52C (minus 20F to 125F). 5 Assembly 5.1 A meter shall be assembled as a unit and shall include all of the components necessary for its intended fun
38、ction. 5.2 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 manufacturer with each meter. 5.3 A brazing material used for joining uid-conning parts of a meter shall have a meltin
39、g point (solidus temperature) exceeding 538C (1000F). 6 Materials 6.1 Metallic materials 6.1.1 General 6.1.1.1 A metallic part, in contact with the fuels anticipated by these requirements, shall be resistant to the action of the fuel if degradation of the material will result in leakage of the fuel
40、or if it will impair the function of the device. For all fuel ratings, see Corrosion due to uid, 6.1.2.1. For products rated for gasoline/ethanol blends with nominal ethanol concentrations greater than 25 percent, see Metallic materials system level, 6.1.3. 6.1.1.2 The exposed surfaces of metallic p
41、arts shall be resistant to atmospheric corrosion if this corrosion will lead to leakage of the uid or if it will impair the function of the device. The material shall comply with the requirements in Atmospheric corrosion, 6.1.2.2. JULY 30, 2014 UL 25A 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURT
42、HER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 6.1.1.3 Metallic parts in contact with the fuels anticipated by these requirements shall not be constructed of lead, or materials that are substantially lead. In addition, no coatings or platings containing lead shall be used, such as terne
43、-plated steel. 6.1.2 Metallic materials material level 6.1.2.1 Corrosion due to uid 6.1.2.1.1 All metallic materials used for uid conning parts shall be resistant to corrosion caused by the fuels anticipated by these requirements. In addition, metallic materials, used internally in uid conning parts
44、, that are required to operate in some manner to address safety (e.g. plunger on a valve) shall be resistant to corrosion caused by these fuels. This requirement also applies to all tubing, piping, or other interconnection means between components. Compliance is veried by the Long Term Exposure Test
45、, Section 12. 6.1.2.1.2 A coating or plating, applied to a base metal, shall be resistant to the action of the fuels anticipated by these requirements as determined by the Long Term Exposure Test, Section 12. 6.1.2.2 Atmospheric corrosion 6.1.2.2.1 Metallic materials used for uid conning parts shall
46、 be resistant to atmospheric corrosion. In addition, metallic materials that are required to operate to address safety shall be resistant to atmospheric corrosion. Ferrous materials of a thickness specied in the following items are acceptable for the preceding when uncoated: a) A casting having a wa
47、ll thickness of not less than 1/4 inch (6.4 mm) if shown by production test to be free of leakage; b) Standard pipe and ttings conforming to the Standard for Welded and Seamless Wrought Steel Pipe, ANSI/ASME B36.10M; and c) Fabricated sheet steel parts having a minimum wall thickness of 0.093 inch (
48、2.36 mm). 6.1.2.2.2 A protective coating shall provide resistance against atmospheric corrosion to a degree not less than that provided by the protective coatings specied in 6.1.2.2.3. 6.1.2.2.3 Cadmium plating shall not be less than 0.0003 inch (0.008 mm) thick, and zinc plating shall not be less t
49、han 0.0005 inch (0.013 mm) thick, except on parts where threads constitute the major portion of the area in which case the cadmium or zinc plating shall not be less than 0.00015 inch (0.0038 mm) thick. Metallic parts are considered to comply with 6.1.2.2 when they are protected against atmospheric corrosion by: a) Hot dipped, mill galvanized sheet steel complying with the coating designation G90 in Table I of the Specication for Sheet Steel, Zinc Coated (Galvanized) or Zinc-Ir
