UL 495-2016 UL Standard for Safety Power-Operated Dispensing Devices for LP-Gas (Fourth Edition).pdf

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1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 495 Power-Operated Dispensing Devices for LP-Gas STANDARD FOR SAFETYUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED M

2、ATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Power-Operated Dispensing Devices for LP-Gas, UL 495 Fourth Edition, Dated April 7, 2016 Summary of Topics: The new edition of UL 495 is being issued to revise the Moist Ammonia-Air

3、Stress Cracking Test. The revised requirements are substantially in accordance with Proposal(s) on this subject dated February 12, 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, mechanical p

4、hotocopying, 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 for any spec

5、ial, 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 such damage. In

6、 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, damage, claim,

7、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 7, 2016 UL 495 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERM

8、ISSION FROM UL APRIL 7, 2016 UL 495 tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL APRIL 7, 2016 1 UL 495 Standard for Power-Operated Dispensing Devices for LP-Gas First Edition February, 1986 Second Edition November

9、, 1994 Third Edition March, 2000 Fourth Edition April 7, 2016 This UL Standard for Safety consists of the Fourth Edition. 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 Collaborat

10、ive 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 Standards and all copyrights, ownerships, and rights regarding those Standards shall remain the sole and exc

11、lusive property of UL. COPYRIGHT 2016 UNDERWRITERS LABORATORIES INC.UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL APRIL 7, 2016 POWER-OPERATED DISPENSING DEVICES FOR LP-GAS - UL 495 2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORI

12、ZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS INTRODUCTION 1 Scope .5 2 General 5 2.1 Components .5 2.2 Units of measurement .6 2.3 Undated references .6 3 Glossary .6 CONSTRUCTION MECHANICAL EQUIPMENT 4 General 7 5 Materials .8 6 Base 9 7 Pedestal .9 8 Housing 10

13、9 Bypass Valves .11 10 Pressure Relief .11 11 Strainers .11 12 Meters .12 13 Vapor Separators .12 14 Valves .12 15 Piping and Fittings 13 16 Hose and Couplings 14 17 Control Application 15 ELECTRICAL EQUIPMENT 18 General 15 19 Motors .18 20 Switches .18 21 Wiring Methods .18 22 Locking Mechanism .20

14、 23 Lighting, Electrical, and Electronic Equipment Mounted on a Dispenser .20 PERFORMANCE 24 General 20 25 Endurance Test 21 25.1 Mechanical shaft seal .21 25.2 Retrieving mechanism 21 26 High-Pressure Leakage Test .21 27 Hydrostatic Strength Test 21 28 Moist Ammonia-Air Stress Cracking Test 22 29 F

15、loat Crushing Test .22 30 Marking Adhesion Test 23 31 Volume-Change Test 23 32 Weight-Loss Test .24 APRIL 7, 2016 POWER-OPERATED DISPENSING DEVICES FOR LP-GAS - UL 495 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 33 Aging Test .24 34 Tor

16、que Test 25 INSTALLATION INSTRUCTIONS 35 General 25 MANUFACTURING AND PRODUCTION TESTS 36 General 26 MARKINGS 37 General 27 APPENDIX A Standards for ComponentsA1 APRIL 7, 2016 POWER-OPERATED DISPENSING DEVICES FOR LP-GAS - UL 495 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DI

17、STRIBUTION WITHOUT PERMISSION FROM UL INTRODUCTION 1 Scope 1.1 These requirements cover power-operated dispensing devices intended to be installed outside of buildings and used at service stations for dispensing liqueed petroleum gas used as an engine fuel. Requirements for installation and use of t

18、hese dispensing devices are included in the Liqueed Petroleum Gas Code (National Fire Codes, vol 2), NFPA 58, and the National Electrical Code, NFPA 70. 1.2 These requirements cover wiring methods used to install or interconnect control equipment when the equipment is located directly on or within t

19、he housing of the dispensing device. 1.3 These requirements do not cover control equipment that may authorize, monitor, or interrupt operation of a power-operated dispensing device. Such equipment includes panel mounted equipment located adjacent to the dispensing device, remote consoles located ins

20、ide a permanent structure, and auxiliary equipment physically attached to the dispensing device or enclosed by the pedestal and housing. 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 with the requirements for that componen

21、t. 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 component in the product covered by

22、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 performance capabilities. Such componen

23、ts 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. APRIL 7, 2016 POWER-OPERATED DISPENSING DEVICES FOR LP-GAS - UL 495 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION

24、 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. 2.3 Undated references 2.3.1 Any undated reference to a code or standard appearing in the requirements o

25、f 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 BASE That part of the assembly that is intended to be secured to the foundation on which the dispensing device will be

26、installed. 3.3 CLASS I HAZARDOUS LOCATIONS Locations in which ammable gases or vapors are or may be present in the air in quantities sufficient to produce explosive or ignitable mixtures. For the purpose of these requirements Class I hazardous locations are further dened as follows: a) Class I, Grou

27、p D, Division 1 The entire space within a dispenser enclosure and 18 inches (457 mm) horizontally from the enclosure exterior up to an elevation 4 feet (1.2 m) above the dispenser base. b) Class I, Group D, Division 2 The area up to 18 inches above grade and from 18 inches to 20 feet (6.1 m) horizon

28、tally from any edge of the dispenser enclosure. 3.4 ELECTRICAL CIRCUITS a) High-Voltage Circuit A circuit involving a potential of not more than 600 volts and having circuit characteristics in excess of those of a low-voltage or Class 2 circuit. b) Low-Voltage Circuit A circuit involving a potential

29、 of not more than 30 volts alternating current (rms) (42.4 volts peak or direct current), and: 1) Supplied by a Class 2 transformer, or by a battery, by a battery and xed impedance, or by a transformer and xed impedance each of which, as a unit, is in compliance with what is required for a Class 2 t

30、ransformer or 2) Limited to a maximum of 100 volt-amperes. A circuit derived from a high-voltage circuit, by connecting resistance in series with the supply circuit as a means of limiting the voltage and current, is not considered to be a low-voltage circuit. c) Intrinsically Safe Circuit A circuit

31、incapable of releasing sufficient electrical energy under normal or abnormal conditions to cause ignition of a specic hazardous atmospheric mixture. Abnormal conditions include unintentional damage to any part of the equipment or wiring, insulation or other malfunction of electrical components, appl

32、ication of overvoltage, adjustment and maintenance operations, and other similar conditions. 3.5 HOUSING That section of a dispensing device that encloses and is intended to protect operating parts, control mechanisms, or other mechanical or electrical components, the damage of which would: APRIL 7,

33、 2016 POWER-OPERATED DISPENSING DEVICES FOR LP-GAS - UL 495 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL a) Render the device incapable of being operated as intended, b) Lead to tampering, c) Introduce the possibility of escape of liquid

34、, or d) Expose bare live electrical parts. 3.6 INTENDED CARE AND USAGE Intended care means tasks such as lubrication and cleaning. Intended usage covers the manipulations involved in starting the dispenser, dispensing the liquid, and restoring the dispenser to its standby condition. 3.7 PANEL A prin

35、cipal section of a housing or enclosure. A mounting arrangement for control and other components. 3.8 PEDESTAL That part of the structure above the base that supports the component units, and to which they are attached. 3.9 PUMPING UNIT A power-operated pump for LP-Gas that may incorporate a straine

36、r, bypass valve, relief device, or other auxiliary parts. CONSTRUCTION MECHANICAL EQUIPMENT 4 General 4.1 A power-operated dispensing device typically includes a base, housing, pedestal, power-operated pump, pressure-relief device, strainer, meter, valves as required, hose, hose-nozzle valve, motor

37、control, locking mechanism, piping, and electrical wiring and xtures. 4.2 A dispensing device may be of the self-contained type with components mounted in a common pedestal and housing, or it may be comprised of separately housed assemblies intended for installation as individual units but in conjun

38、ction with each other. 4.3 A dispensing device, other than one including a hose reel or weighted loop in its assembly, may be furnished without the hose. 4.4 The construction of a dispensing device shall be such that parts can be replaced or reassembled to function as intended after being dismantled

39、. 4.5 A dispensing device shall incorporate provisions for support independent of piping, tubing, or conduit that may be connected thereto. APRIL 7, 2016 POWER-OPERATED DISPENSING DEVICES FOR LP-GAS - UL 495 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PER

40、MISSION FROM UL 5 Materials 5.1 Fluid-containing parts other than a seal ring or gasket shall have a melting point (solidus temperature) of not less than 510C (950F). 5.2 Bodies or enclosures in contact with the liquid to be handled shall be of: a) Steel; b) Ductile (modular) iron (Standard Specicat

41、ion for Ferritic Ductile Iron Pressure-Retaining Castings for Use at Elevated Temperatures, ASTM A395, or Standard Specication for Ductile Iron Castings, A536, Grade 60-40-18 or 65-45-12); c) Malleable iron (Standard Specication for Malleable Iron Castings, ASTM A47); d) Gray iron (Standard Specicat

42、ion for Gray Iron Castings, ASTM A48, Class 40B, or Standard Specication for Gray Iron Castings for Valves, Flanges, and Pipe Fittings, ASTM A126, Class B or C); e) Brass; or f) A material determined to be equivalent. 5.3 A brazing material used to join liquid-conning parts shall have a melting poin

43、t (solidus temperature) of not less than 510C (950F). 5.4 A liquid-conning casting shall be free from porosity leakage (see the High-Pressure Leakage Test, Section 26) and shall have a wall thickness of not less than that specied in Table 5.1. Exception: Pipe and pipe ttings need not comply with the

44、 thickness requirements specied in Table 5.1. Table 5.1 Wall thickness of castings Material Minimum wall thickness, inch (mm) High-strength cast iron 1/4 6.4 Malleable iron, ductile iron, or cast steel 3/16 4.8 Brass or bronze 3/16 4.8 5.5 A nonmetallic part in contact with the uid to be handled sha

45、ll be resistant to the action of such uid and shall comply with the applicable requirements in Sections 31 33. 5.6 If atmospheric corrosion of a part will interfere with the intended function of a dispenser, the part shall be of corrosion-resistant material or be provided with a corrosion-resistant

46、protective coating. APRIL 7, 2016 POWER-OPERATED DISPENSING DEVICES FOR LP-GAS - UL 495 8UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 5.7 A protective coating shall provide resistance against corrosion to a degree not less than that provi

47、ded by the protective coatings specied in 5.8. 5.8 Cadmium plating shall not be less than 0.0003 inch (0.008 mm) thick and zinc plating shall not be less than 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 plati

48、ng shall not be less than 0.00015 inch (0.0038 mm) thick. 5.9 If warping of a casting can affect the tightness of a liquid-conning joint, or the necessary t of parts, the casting shall be stress relieved to reduce the possibility of warping. 5.10 A pressure conning part made of drawn brass or machin

49、ed from brass rod shall withstand, without cracking, the Moist Ammonia-Air Stress Cracking Test, Section 28. 6 Base 6.1 A base shall be made of ordinary cast iron not less than 1/4 inch (6.4 mm) thick or commercial grade steel not less than 0.093 inch (2.36 mm) thick. Exception: Other materials or constructions may be used if determined to provide equivalent strength. 6.2 A base shall be provided with bolt holes that will accommodate bolts not less than 1/2 inch (12.7 mm) in