1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 2227 Overlling Prevention DevicesUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER
2、REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Overlling Prevention Devices, UL 2227 Second Edition, Dated February 16, 2007 Summary of Topics This revision of ANSI/UL 2227 is being issued to revise requirements in the Operation Test in paragraph 12.2 and Table 12
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10、ctive date are located after the Standard, and are preceded by a SUPERSEDED REQUIREMENTS notice. JUNE 6, 2014 UL 2227 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL JUNE 6, 2014 UL 2227 tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT
11、 AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL FEBRUARY 16, 2007 (Title Page Reprinted: June 6, 2014) 1 UL 2227 Standard for Overlling Prevention Devices First Edition November, 1999 Second Edition February 16, 2007 This ANSI/UL Standard for Safety consists of the Se
12、cond Edition including revisions through June 6, 2014. The most recent designation of ANSI/UL 2227 as an American National Standard (ANSI) occurred on June 6, 2014. ANSI approval for a standard does not include the Cover Page, Transmittal Pages, Title Page, or effective date information. Comments or
13、 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 electronic c
14、opy 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 2014 UNDERWRITERS LABORATORIES INC. ANSI/UL 2227-2014UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURT
15、HER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL OCTOBER 16, 2009 OVERFILLING PREVENTION DEVICES - UL 2227 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 4 2.1 Comp
16、onents .4 2.2 Undated references .5 2.3 Units of measurement .5 3 Service Pressure Rating .5 4 Glossary .5 CONSTRUCTION 5 General 5 6 Materials .7 7 Springs 8 PERFORMANCE 8 General 8 9 Deformation Test .9 10 External Leakage Test 10 11 Seat Leakage Test 10 12 Operation Test .11 13 Liquid Withdrawal
17、Test 12 14 Positive Shutoff Test 12 15 Endurance Test 13 16 Vibration Test 14 17 Hydrostatic Strength Test 14 18 Surge Pressure Test .14A 19 Float Crush Test 14A 20 Float Pull Test 14A 21 Breakoff Test .14A 22 10-Day Moist Ammonia Test .15 23 Accelerated Aging Test 15 24 LP-Gas Compatibility Test .1
18、5 25 Commercial Propane Compatibility Test 16 26 Low Temperature Test 16 27 Impact Resistance (Drop Test) .16 28 BTU Flow Rating Test 17 MANUFACTURING AND PRODUCTION TESTS 29 General 17 MARKING 30 General 18 OCTOBER 16, 2009 OVERFILLING PREVENTION DEVICES - UL 2227 3UL COPYRIGHTED MATERIAL NOT AUTHO
19、RIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INTRODUCTION 1 Scope 1.1 These requirements cover devices for use on stationary containers or portable LP-Gas containers that consist of a shutoff mechanism that works in conjunction with a liquid level sensing device that shu
20、ts off the incoming ow of LP-Gas during a relling operation when the liquid level reaches a predetermined point. The sensing mechanism may be a oat, dip tube, or other type of sensor that is intended to cause operation of the shutoff mechanism. An overlling prevention device may be a separate compon
21、ent intended for installation on cylinder or ll valves designed for such purposes, or may be incorporated into the design of a cylinder or ll valve assembly. Overlling prevention devices may be designed for use in automotive applications. 1.2 Overlling prevention devices covered by these requirement
22、s are for use in applications covered by the following standards: a) Liqueed Petroleum Gas Code, NFPA No. 58. b) Outdoor Cooking Gas Appliances, ANSI Z21.58/CGA 1.6-M95. c) Standard on Recreational Vehicles, RVIA A119.2. 2 General 2.1 Components 2.1.1 Except as indicated in 2.1.2, a component of a p
23、roduct 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 b) I
24、s 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 for us
25、e only under limited conditions, such as certain temperatures not exceeding specied limits, and shall be used only under those specic conditions. FEBRUARY 16, 2007 OVERFILLING PREVENTION DEVICES - UL 2227 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMIS
26、SION FROM UL 2.2 Undated references 2.2.1 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. 2.3 Units of measurement 2.3.1 Values stated without parentheses are the requirement.
27、 Values in parentheses are explanatory or approximate information. 3 Service Pressure Rating 3.1 The service pressure rating shall not be less than 250 psig (1.7 MPa) for ASME pressure vessels and 240 psig (1.7 MPa) for cylinders. 3.1 revised February 16, 2007 3.2 The devices covered by these requir
28、ements are intended for use at temperatures within the range of minus 40 to plus 130F (minus 40 to plus 55C). 4 Glossary 4.1 For the purpose of this standard the following denitions apply. 4.2 CONTAINER A pressure vessel including cylinders, tanks, and portable tanks used for transporting or storing
29、 of LP-Gas. 4.3 CYLINDER A portable container that complies with the specication for cylinders constructed under subpart C of Part 178 of the DOT Regulations and similar specications of the TC regulations. 4.4 PRESSURE CONFINING COMPONENTS Components of an overlling prevention device that prevent th
30、e release of LP-Gas to the atmosphere from the container. CONSTRUCTION 5 General 5.1 An overlling prevention device shall include all of the components required for its normal function and installation, and shall be furnished as a single unit or as part of a valve/OPD assembly. 5.1 revised February
31、16, 2007 5.2 When an overlling prevention device is of a design which 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 overlling prevention device. 5.3 A seat disc sh
32、all be attached to its poppet or holder, or be otherwise assembled so as to prevent it from becoming dislocated under service conditions. The means to secure the disc shall not rely on cement or adhesive. FEBRUARY 16, 2007 OVERFILLING PREVENTION DEVICES - UL 2227 5UL COPYRIGHTED MATERIAL NOT AUTHORI
33、ZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 5.4 A brazing material used for joining pressure conning components of an overlling prevention device for LP-Gas shall have a melting point (solidus temperature) not less than 1000F (538C). 5.5 Pipe threads shall be in accordanc
34、e with the Standard for Pipe Threads, General Purpose (Inch), ANSI/ASME B1.20.1, FED-STD-H28/7, Screw-Thread Standards for Federal Services, Section 7, Pipe Threads, General Purpose , or FED-STD-H28/8Screw-Thread Standards for Federal Services, Section 8, Dryseal Pipe Threads. 5.5 revised February 1
35、6, 2007 5.6 An overlling prevention device intended for installation on a cylinder valve shall be provided only on such valves for which it is designed. This assembly shall be constructed and marked in accordance with the Standard for Cylinder Valves, UL 1769. 5.7 An overlling prevention device whic
36、h is incorporated into the design of a cylinder valve shall also comply with the Standard for Cylinder Valves, UL 1769. 5.8 Filler valves used in the assembly of overll prevention devices shall comply with the Standard for Valves for Anhydrous Ammonia and LP-Gas (Other than Safety Relief), UL 125. 5
37、.8 added February 16, 2007 5.9 An automotive overlling prevention device that is provided with threads for direct connection to a ller valve shall have sufficient strength and durability to prevent the ller valve from separating from the liquid level control valve body. See the Breakoff Test, Sectio
38、n 21. 5.10 A oat shall be secured to its corresponding lever, rod, or other part of the mechanism by a method that prevents the oat from becoming detached under service conditions. See the Float Pull Test, Section 20. 5.11 A oat-operated liquid level control valve shall be provided with a means to m
39、aintain proper oat orientation during the life of the device. 5.12 The operating parts of an automotive overlling prevention device shall be protected against freezing rain, road dirt, salt and other foreign matter. The protective means shall not rely on cement or adhesives for securement. 5.13 An O
40、PD design shall be such that liquid propane cannot be withdrawn from the cylinder with propane temperature starting at 40F and rising to 85F. This shall be demonstrated by design calculation for each OPD design for each size and design of cylinder for which the OPD may be used, using the lowest pote
41、ntial liquid propane pickup point on the OPD and then comparing it to propane liquid level at 85F starting from the 83 percent ll at 40F or submit product for testing as dened in the Liquid Withdrawal Test, Section 13. Added 5.13 effective February 16, 2009 FEBRUARY 16, 2007 OVERFILLING PREVENTION D
42、EVICES - UL 2227 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 6 Materials 6.1 Pressure-conning components of an overlling prevention device or operating parts, when failure of the part allows leakage or hazardous operation, shall have su
43、fficient strength and durability to furnish reliable service of the parts and of the assembly. 6.2 To conform to the requirement of 6.1, a material (except a disc or soft seat, a seal ring, a diaphragm, or a gasket) is to have a melting point (solidus temperature) of not less than 950F (510C) and a
44、tensile strength of not less than 10,000 psig (68.9 MPa) at 400F (204C). 6.3 Nonductile cast iron (regular gray iron) shall not be used for bodies or closures for overlling prevention devices. This does not prohibit the use of nodular iron. 6.4 A part in contact with the liquid to be handled shall b
45、e resistant to the action of such liquid. 6.5 With reference to the requirement in 6.4, elastomeric materials shall be subjected to: a) The Accelerated Aging Test, Section 23; b) The LP-Gas Compatibility Test, Section 24; and c) The Low Temperature Test, Section 26. Polymeric materials shall be subj
46、ected to the Accelerated Aging Test, Section 23, and the LP-Gas Compatibility Test, Section 24. Exception: Acetal polymers, chlorotriuorethylene polymers, tetrauorethylene, uorinated ethylene propylene polymers and polyamides of composition polyhexamethylene adipamide or polycaproamide polymers (nyl
47、on 6, 6/6 or 6/16) shall only be subjected to the Accelerated Aging Test, Section 23. 6.6 When corrosion of a part interferes with the proper function of an overlling prevention device, the part shall be of a corrosion-resistant material or be provided with a corrosion-resistant protective coating.
48、6.7 A protective coating shall provide resistance against corrosion to a degree not less than that provided by the protective coatings specied in 6.8. 6.8 Cadmium plating shall have a thickness of not less than 0.0003 inch (0.008 mm), and zinc plating shall have a thickness of not less than 0.0005 i
49、nch (0.013 mm), except on parts where threads constitute the major portion of the area, in which case the thickness of the cadmium or zinc plating shall not be less than 0.00015 inch (0.0038 mm). 6.9 When warping of a casting affects the tightness of liquid-conning joints or the necessary t of parts, the casting shall be stress relieved to reduce to a minimum the possibility of warping. 6.10 A part made of drawn brass or machined from a brass ro
