1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULAugust 28, 20131UL 1337Outline of Investigation for LP-Gas, Natural Gas, and Manufactured GasDevices for Engine Fuel SystemsIssue Number: 2August 28, 2013Summary of TopicsThis is the second issue
2、 of the Outline of Investigation for LP-GasAutomotive Accessories, UL 1337. A change to the title was madebecause the term Automotive had the connotation that devices were tobe used only on over-the-road vehicles. Devices covered by theserequirements can be used on such vehicles but they can also be
3、 used inother types of fuel systems such as engine generators, industrial trucksand the like. In addition, natural gas and manufactured gas were added.Devices covered include the following: electrically operated shutoffvalves; combination manual/automatic shutoff valves, Carburetors/Air FuelMixers,
4、regulators and vaporizer regulators; filters and strainers; fuellocks and fuel-lock filters; fittings, connectors and quick closingcouplings; liquid level gauges; and liquid level control valves (also knownas overfilling prevention devices).COPYRIGHT 2013 UNDERWRITERS LABORATORIES INC.UL COPYRIGHTED
5、 MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULAUGUST 28, 2013UL 13372No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULCONTENTSINTRODUCTION1 Scope .42 General 52.1 Components .52.2
6、 Units of measurement .52.3 Undated references .53 Glossary .54 Pressure and Temperature Ratings .7CONSTRUCTION5 General 76 Materials .87 Bodies .98 Springs .109 Electrically Operated Automatic Shutoff Valves and Devices Containing Solenoids or OtherElectrical Components 1010 LP-Gas Liquid Level Gau
7、ges 1111 LP-Gas Automatic Liquid Level Control Valves Valves 1112 Vacuum Actuated Fuel Locks and Automatic Shutoff Valves .1113 Regulators, Vaporizers, and Vaporizer-Regulators 1214 Relief Devices 1215 Air-Fuel Mixers/Carburetors 1216 Fittings and Connectors .1217 Filters .13PERFORMANCE18 General 13
8、19 Deformation Test .1420 Leakage Test 1521 Endurance Test 1622 Start-To-Discharge Test for Relief Valves 1723 Hydrostatic Strength Test 1824 Operation Test for Excess Flow Valves 1825 Vibration Test 1926 Solenoid Primer Cycling Test .2027 Freeze Test 2028 Accelerated Aging Test 2029 Fuel Gas Compat
9、ibility Test .2130 Low Temperature Test 2131 Moist Ammonia Air Stress Cracking Test 2232 Ignition Test 22MARKINGS33 General 23AUGUST 28, 2013 UL 1337 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULINTRODUCTION1 Scope1.1 These requirements co
10、ver the following types of devices for engine fuel system applications intendedfor use with liquefied petroleum gas (LP-Gas), natural gas, and/or manufactured gas.a) Automatic shutoff valves electrically operated or vacuum actuated (mechanical);b) Combination Manual/Automatic Shutoff Valves electric
11、ally operated or vacuum actuated(mechanical);c) Carburetors or Air-Fuel Mixers;d) Regulators;e) Vaporizers and Vaporizer/Regulators;f) Filters and strainers;g) Fuel locks and fuel-lock filters;h) Fittings and connectors;i) Quick connect couplings and quick closing couplings;j) Liquid level gauges;k)
12、 Liquid level control valves (also known as overfilling prevention devices); andl) Relief devices.1.2 Devices covered by these requirements are for use in engine fuel systems and engine fuel systemsin facilities covered in the Liquefied Petroleum Gas Code, NFPA 58, Vehicular Fuel Systems Code, NFPA5
13、2, and/or Standard for the Installation and Use of Stationary Combustion Engines and Gas Turbines,NFPA 37.1.3 Devices covered by this standard are intended to be installed and used on board the vehicle(automobile, fork-lift, etc.) or engine generators that they are intended for use with. This outlin
14、e does notcover these devices for general use.1.4 Except for such observations as are required to ascertain performance characteristics, the assigningof flow capacity ratings are not within the scope of these requirements.AUGUST 28, 2013UL 13374UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPR
15、ODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL2 General2.1 Components2.1.1 Except as indicated in 2.1.2, a component of a product covered by this outline shall comply with therequirements for that component.2.1.2 A component is not required to comply with a specific requirement that:a) Involves
16、a feature or characteristic not required in the application of the component in theproduct covered by this outline, orb) Is superseded by a requirement in this outline.2.1.3 A component shall be used in accordance with its rating established for the intended conditions ofuse.2.1.4 Specific component
17、s are incomplete in construction features or restricted in performancecapabilities. Such components are intended for use only under limited conditions, such as certaintemperatures not exceeding specified limits, and shall be used only under those specific conditions.2.2 Units of measurement2.2.1 Val
18、ues stated without parentheses are the requirement. Values in parentheses are explanatory orapproximate information.2.3 Undated references2.3.1 Any undated reference to a code or standard appearing in the requirements of this outline shall beinterpreted as referring to the latest edition of that cod
19、e or standard.3 Glossary3.1 For the purposes of this outline, the following definitions apply.3.2 AUTOMATIC SHUTOFF VALVE A type of shutoff valve that uses energy (electrical ormechanical) based upon some input, to open and close the valve member.3.3 COMBINATION MANUAL/AUTOMATIC SHUTOFF VALVE A shut
20、off valve for fuel gas servicethat can be operated by both manual and automatic means.3.4 FUEL LOCK An industry term used to indicate an automatic shutoff valve that is placed in thefuel line ahead of the vaporizer-regulator.3.5 FUEL LOCK FILTER A device that combines a fuel lock (automatic shutoff
21、valve) with a fuel gasfilter.3.6 LIQUEFIED PETROLEUM GAS (LP-GAS OR LPG) Any material having a vapor pressure notexceeding that allowed for commercial propane that is composed predominantly of the followinghydrocarbons, either by themselves (excluding propylene) as mixtures: propane, propylene, buta
22、ne(normal butane or isobutane) and butylenes.AUGUST 28, 2013 UL 1337 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL3.7 LOCKUP PRESSURE The outlet pressure of a positive outlet pressure type vaporizer-regulatoror regulator under no flow cond
23、itions.3.8 MANUFACTURED GAS Synthetically produced mixture of methane and other gases, such ascarbon monoxide, produced by chemically treating coal.3.9 NATURAL GAS A naturally occurring hydrocarbon gas mixture consisting primarily of methane,along with other hydrocarbons, carbon dioxide, nitrogen, a
24、nd hydrogen sulfide.3.10 QUICK CLOSING COUPLING A device that consists of two parts (male and female), whichprovides for a means of connecting and disconnecting a fuel gas cylinder assembly from the fuel linewithout the use of tools. The two parts are threaded together. The coupling incorporates 1-1
25、/4 inchACME threads and each part contains a check valve that closes when the two parts are separated.3.11 QUICK CONNECT COUPLING A device that consists of two parts (male and female), whichprovides for a means of connecting and disconnecting a fuel gas cylinder assembly from the fuel linewithout th
26、e use of tools. The two parts are pushed together and are not threaded. Each part contains acheck valve that closes when the two parts are separated.3.12 REGULATOR, NEGATIVE OUTLET PRESSURE TYPE A secondary stage fuel gas regulatorthat takes in vapor at a specified pressure and then reduces the pres
27、sure to a pressure less thanatmospheric pressure (vacuum) at its outlet or final stage. This term may also apply to vaporizer-regulator.3.13 REGULATOR, POSITIVE OUTLET PRESSURE TYPE A regulator (primary or secondary type)that takes in fuel gas vapor at a specified pressure and then reduces the press
28、ure to a lower pressure,but greater than atmospheric pressure at its outlet or final stage. This term may also apply to vaporizer-regulator.3.14 REGULATOR, PRIMARY STAGE TYPE A type of regulator for fuel gas, that has an inletpressure rating equal to or greater than cylinder pressure or main gas sup
29、ply pressure and reduces thispressure to some lower pressure.3.15 REGULATOR, SECONDARY STAGE TYPE A type of regulator for fuel gas that has an inletpressure rating less than cylinder or main gas supply pressure. It is intended for connection into the fuelgas train at some point after a primary stage
30、 regulator. It serves as the final regulator in the fuel train.3.16 STATIC SEAL A seal that is not subject to mechanical movement or other applied forces otherthan compressive forces that are applied during installation and maintained during normal useconditions.3.17 VAPORIZER-REGULATOR A combinatio
31、n vaporizer and primary stage regulator that takes inliquid fuel at its inlet and adds heat to change the liquid to a vapor and then reduces the vapor pressureto a specified amount at its outlet or final stage.AUGUST 28, 2013UL 13376UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORD
32、ISTRIBUTION WITHOUT PERMISSION FROM UL4 Pressure and Temperature Ratings4.1 The pressure rating of a device intended for use in LP-Gas service subjected to container pressureshall not be less than 250 pounds per square inch (psi) (1.7 MPa) and shall not exceed 1/5 of its rupturepressure.4.2 The pres
33、sure rating of a device intended for use in natural gas, manufactured gas, or LP-Gas servicenot subjected to container pressure shall be in accordance with the manufacturers rating and shall notexceed 1/5 of its rupture pressure.4.3 The temperature rating for devices other than those installed in an
34、 engine compartment shall complywith the following ranges:a) For outdoor use devices, minus 40C (minus 40F) to 55C (130F), orb) For indoor use devices, 0C (32F) to 55C (130F).4.4 For devices within an engine compartment, the temperature range shall be set by the manufacturer,but shall not be smaller
35、 than the range in (a) above. See Accelerated Aging Test, Section 28.CONSTRUCTION5 General5.1 An engine fuel device shall include all of the components required for its normal function andinstallation, and shall be furnished as a single unit or assembly.5.2 When an engine fuel device is of a design
36、that requires the use of special pipe flanges, gaskets, bolts,or other special fittings or parts for making a proper installation, such parts shall be furnished by themanufacturer with each device.5.3 A seat disc shall be attached to its poppet or holder, or otherwise assembled so as to prevent it f
37、rombecoming dislocated under service conditions. The means to secure the disc shall not rely on cement oradhesive.5.4 Vaporizers and vaporizer-regulators shall not be provided with a fusible plug.AUGUST 28, 2013 UL 1337 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION
38、WITHOUT PERMISSION FROM UL6 Materials6.1 Fluid-confining parts of a device or operating parts shall have the strength and durability to providereliable service of the parts and of the assembly.6.2 To determine compliance with 6.1, a material (except a valve disc or soft seat, a seal ring, adiaphragm
39、, or a gasket) shall have a melting point (solidus temperature) of no less than 950F (510C)and a tensile strength of no less than 10,000 psi (68.9 MPa) at 400F (204C).Exception No. 1: Bodies and bonnets of vaporizer-regulators, and regulators are allowed to be made ofZinc alloys AG 40A, AG 40B, AC 4
40、1A, or AC 43A as specified in the Standard Specification for Zinc andZinc-Aluminum (ZA) Alloy Foundry and Die Castings, ASTM B86.Exception No. 2: Fluid confining parts of vaporizer-regulators are not required to comply with 6.2 if the fluidpassage is restricted by a No. 54 drill orifice 0.055 inch (
41、1 mm) or the flow of gas will be stopped if afault occurs in the fluid confining portion.6.3 A nonmetallic part in contact with fuel gas which will cause unsafe operation or leakage of the fuelgas shall be resistant to the action of such fuel gas.6.4 With reference to the requirement in 6.3, elastom
42、eric materials shall be subjected to:a) The Accelerated Aging Test, Section 28;b) The Fuel Gas Compatibility Test, Section 29; andc) The Low Temperature Test, Section 30.Polymeric materials shall be subjected to the Accelerated Aging Test, Section 28, and the Fuel GasCompatibility Test, Section 29.E
43、xception No. 1: Acetal polymers, chlorotrifluorethylene polymers, tetrafluorethylene, fluorinated ethylenepropylene polymers and polyamides of composition polyhexamethylene adipamide or polycaproamidepolymers (nylon 6, 6/6 or 6/16) shall only be subjected to the Accelerated Aging Test, Section 28.Ex
44、ception No. 2: Nonmetallic parts that serve as static seals in negative pressure chambers of regulatorsare not required to be subjected to the Fuel Gas Compatibility Test or Low Temperature Test.6.5 Nonductile cast iron (regular gray iron) shall not be used for bodies or closures for engine fueldevi
45、ces. This does not prohibit the use of nodular iron.6.6 A brazing material used for joining pressure-confining parts of an engine fuel device shall have amelting point (solidus temperature) of no less than 1000F (538C).6.7 Metals used in combination shall be galvanically compatible. Aluminum shall n
46、ot be used incombination with copper or copper alloy.AUGUST 28, 2013UL 13378UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL6.8 When corrosion of a part interferes with the proper function of a valve, the part shall be of acorrosion-resistant
47、material or be provided with a corrosion-resistant protective coating.6.9 A protective coating shall provide resistance against corrosion, to a degree no less than that providedby the protective coatings specified in 6.10.6.10 Cadmium plating shall have a thickness of no less than 0.0003 inch (0.008
48、 mm), and zinc platingshall have a thickness of no less than 0.0005 inch (0.013 mm).Exception: On parts where threads constitute the major portion of the area, the thickness of the cadmiumor zinc plating shall be no less than 0.00015 inch (0.0038 mm).6.11 When warping of a casting affects the tightn
49、ess of liquid-confining joints or the proper fit of parts, thecasting shall be stress-relieved to reduce the risk of warping.6.12 A part made of drawn brass or machined from brass rod shall be capable of withstanding, withoutcracking, the Moist Ammonia Air Stress Cracking Test, Section 31, for copper and copper alloys.7 Bodies7.1 A threaded section of an engine fuel device designed for connection to piping shall be constructedwith a section to serve as a wrench grip.7.2 Pipe threads shall be in accordance with the Standard for
