1、November 9, 2001Prior to the third issue, the requirements for the products covered by this Outlinewere included in the first and second issues of the Outline of Investigation forCommercial Butane-Fueled Portable Cook Stoves, Subject 243.1SUBJECT 2191OUTLINE OF INVESTIGATIONFORCOMMERCIAL BUTANE-FUEL
2、ED PORTABLE COOK STOVESIssue Number: 3NOVEMBER 9, 2001COPYRIGHT 2001 UNDERWRITERS LABORATORIES INC.NOVEMBER 9, 2001SUBJECT 21912No Text on This PageCONTENTSFOREWORD 4INTRODUCTION1 Scope .52 General 52.1 Components .52.2 Units of measurement .62.3 Undated references .63 Glossary .6CONSTRUCTION4 Gener
3、al 65 Valve Operation 76 Fuel Containers .77 Pressure Regulator 8PERFORMANCE8 General 89 Combustion Test .109.1 Sample conditioning .109.2 Hood adjustment 109.3 Test Part I 109.4 Test Part II 109.5 Test Part III .1110 Temperature Test .1111 Abnormal Pressure Operation Tests 1212 Low Temperature Oper
4、ation Test .1313 Fuel Container Loading Endurance Test .1314 Stove Tilt/Slide Test .1315 10-Day Moist Ammonia-Air Stress Cracking Test .1416 Drop Test 14MARKINGS17 Stove Markings .14INSTRUCTIONS18 General 15NOVEMBER 9, 2001 SUBJECT 2191 3FOREWORDA. This Outline of Investigation contains basic requir
5、ements for products covered by UnderwritersLaboratories Inc. (UL) under its Follow-Up Service for this category within the limitations given below andin the Scope section of this Outline of Investigation. They are subject to revision as further experience andinvestigation may show is necessary or de
6、sirable.B. The observance of these requirements by a manufacturer is one of the conditions of the continuedcoverage of the manufacturers product.C. A product which complies with the text of this Outline of Investigation will not necessarily be judged tocomply with the Outline of Investigation if, wh
7、en examined and tested, it is found to have other featureswhich impair the level of safety contemplated by these requirements.D. A product that contains features, characteristics, components, materials, or systems new or differentfrom those covered by the requirements in this Outline of Investigatio
8、n, and that involves a risk of fire orof electric shock or injury to persons shall be evaluated using appropriate additional component andend-product requirements to maintain the level of safety as originally anticipated by the intent of thisOutline of Investigation. A product whose features, charac
9、teristics, components, materials, or systemsconflict with specific requirements or provisions of this Outline of Investigation does not comply with thisOutline of Investigation. Revision of requirements shall be proposed and adopted in conformance with themethods employed for development, revision,
10、and implementation of this Outline of Investigation.E. UL, in performing its functions in accordance with its objectives, does not assume or undertake todischarge any responsibility of the manufacturer or any other party. The opinions and findings of ULrepresent its professional judgement given with
11、 due consideration to the necessary limitations of practicaloperation and state of the art at the time the Outline of Investigation is processed. UL shall not beresponsible to anyone for the use of or reliance upon this Outline of Investigation by anyone. UL shall notincur any obligation or liabilit
12、y for damages, including consequential damages, arising out of or inconnection with the use, interpretation of, or reliance upon this Outline of Investigation.F. Many tests required by the Outline of Investigations of UL are inherently hazardous and adequatesafeguards for personnel and property shal
13、l be employed in conducting such tests.NOVEMBER 9, 2001SUBJECT 21914INTRODUCTION1 Scope1.1 These requirements cover portable cook stoves equipped with a self-contained butane gas fuelsupply. The fuel container is of the non-refillable type and has a maximum capacity of more than 4 fluidounces (118 m
14、l) but no more than 10 ounces (296 ml) of butane. The maximum capacity in pounds ofwater is 1.08 (0.49 kg). A stove may employ no more than two fuel containers. The fuel container isremovable and replaceable in normal use.1.2 The cooking stoves covered by these requirements are intended solely for u
15、se outdoors as campingequipment, or for use indoors in commercial restaurants where food is prepared at individual tables. Thestoves are not intended for indoor household use, nor are they intended for permanent attachment to themounting surface or for connection to a remote fuel container.1.3 These
16、 stoves are intended for use in accordance with the Standard for the Storage and Handling ofLiquefied Petroleum Gases, NFPA 58.2 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 comp
17、onent need not comply with a specific requirement that:a) Involves a feature or characteristic not needed 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 establ
18、ished for the intended conditions ofuse.2.1.4 Specific components 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 u
19、nder those specific conditions.NOVEMBER 9, 2001 SUBJECT 2191 52.2 Units of measurement2.2.1 Values 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
20、requirements of this outline shall beinterpreted as referring to the latest edition of that code or standard.3 Glossary3.1 For the purpose of this outline the following definition applies.3.2 BUTANE A liquefied petroleum gas composed predominantly of two isomeric forms, normal oriso, either by thems
21、elves or as mixtures where the vapor pressure does not exceed that for commercialbutane in accordance with the Specification for Liquefied Petroleum (LP) Gases, ASTM D1835.CONSTRUCTION4 General4.1 Portable cook stoves shall comply with the following requirements of the Standard for Portable CampCook
22、 Stoves for Use with Propane Gas, ANSI Z21.72-1982, and ANSI Z21.72A-1984 :a) 1.2 General construction and assembly, except 1.2.1 and 1.2.11.b) 1.3 Materials, except for 1.3.4. Refer to the Standard for Gaskets and Seals, UL 157, fortests of non-metallic materials exposed to gases.c) 1.5 Gas supply
23、lines, except 1.5.6 and 1.5.7.d) 1.6 Gas supply systems, except 1.6.1, 1.6.3, 1.6.5, and 1.6.6.e) 1.7 Orifices and orifice fittings.f) 1.8 Burners.g) 1.11 Cooking tops, top covers, and grates.h) 1.12 Ignition devices.4.2 A fuel-confining part made of drawn brass or machined from brass stock shall wi
24、thstand, withoutcracking, the 10-Day Moist Ammonia-Air Stress Cracking Test, Section 15, for copper and copper alloys.4.3 A part threaded into the fuel-handling system of the stove at any point, such as a valve stem orclosure plug, shall be constructed to prevent removal by manual means or by using
25、ordinary tools.NOVEMBER 9, 2001SUBJECT 219164.4 All fuel-handling parts of the stove which can be directly exposed to the full pressure of the fuelcontainer due to pressure regulator malfunction (see the Abnormal Pressure Operation Tests, Section 11)shall have a design pressure of no less than 105 p
26、sig (724.0 kPa).5 Valve Operation5.1 A manually-operated shutoff valve shall comply with the requirements in the Standard for Valves forFlammable Fluids, UL 842. Except as indicated in 5.2, the design pressure of the valve shall not be lessthan the maximum outlet pressure setting of the gas-pressure
27、 regulator.5.2 A manually-operated shutoff valve on a stove required to comply with the Abnormal PressureOperation Tests, Section 11, shall have a design pressure not less than that specified in 4.4.5.3 A burner valve shall require not less than two operations, or other equivalent means, to turn it
28、to theon position, and shall require only one operation to turn it to the off position. A self-latching type valvethat has a push-and-turn or a pull-and-turn operating sequence, or that incorporates a detent feature toresist turning, is considered to comply with the intent of this requirement.5.4 A
29、valve that incorporates a detent feature shall require a minimum torque of 32 ounce-inches (0.226Nm) to turn from the off to the on position. Compliance with this requirement shall be determinedbefore and after an endurance test of 6000 cycles of on-off operation.6 Fuel Containers6.1 A gas fuel cont
30、ainer supplied with a cook stove, or recommended for use with a cook stove in thestove markings and operating instructions, shall comply with Department of Transportation (D.O.T.)requirements as evidenced by appropriate markings on the container.6.2 A gas fuel container shall comply with the require
31、ments included in the Standard for Nonrefillable(Disposable) Type Metal Container Assemblies for Butane, UL 147B.6.3 A stove shall have provision for no more than two fuel containers. If more than one fuel container isused, each container shall be connected to and serve a separate burner, and the fu
32、el containers shall notbe manifolded together.6.4 A stove shall be constructed to provide secure attachment of the fuel container.NOVEMBER 9, 2001 SUBJECT 2191 77 Pressure Regulator7.1 Each cook stove shall be equipped with a gas-pressure regulator which may be combined with themanually-operated gas
33、 shutoff valve. The shutoff valve shall be positioned down stream of the pressureregulator.7.2 A gas-pressure regulator shall be of the non-adjustable, single-stage type and shall comply with therequirements in the Standard for Pressure Regulating Valves for LP-Gas, UL 144.Exception No. 1: The appli
34、cable tests of the pressure regulator shall be based on a maximum inletpressure of 105 psig (724 kPa) or the maximum charging pressure of the fuel container at 130F (54.4C),whichever is less. The flow test shall be conducted at approximately 10, 25, 50, and 75 percent of themaximum inlet pressure. T
35、he endurance test shall be conducted at 30 psig (207 kPa). The freezing raintest need not be conducted.Exception No. 2: The pressure regulator is not required to be equipped with a relief valve or a shutoffdevice as specified in 13.1(a) or (b) of UL 144. The cook stove and pressure regulator shall c
36、omply withthe tests specified in the Abnormal Pressure Operation Tests, Section 11.7.3 When the pressure regulator uses a pressure relief valve to comply with 13.1 in the Standard forPressure Regulating Valves for LP-Gas, UL 144, the vent shall be constructed to discharge any ventedgas from the stov
37、e casing radially away from the burner. The stove shall be provided with a cautionarymarking which indicates that when gases are vented from this opening, the fuel container should beremoved at once, and the stove should not be operated until it has been repaired.PERFORMANCE8 General8.1 A portable c
38、ook stove shall be tested with each different butane fuel container specified for use withthe stove.8.2 Prior to the tests of the cook stove, two samples of each different fuel container specified for use withthe stove shall be tested under controlled temperature conditions using air or water immers
39、ion todetermine the resulting pressure at each temperature specified in note a of Table 8.1. For this test, aspecial fitting to connect the container to the pressure gauge is required.NOVEMBER 9, 2001SUBJECT 21918Table 8.1Test pressure conditionsPressure conditionaTest pressure, PsigbReduced 1.1Norm
40、al 22.4Increased 42.0aThe reduced, normal, and increased pressure conditions correspond approximately to the vapor pressure for commercialbutane at 32F (0C), 77F (25C), and 100F (38C) ambient temperatures, respectively. See 3.2 for a definition of butane.bOr at the test pressures resulting from expo
41、sure of the specified fuel container to the three ambient conditions specified innote a, whichever is higher. See 8.2 for test procedures to determine the pressures corresponding to the three ambientconditions.8.3 Unless specified otherwise in this outline, inlet test pressures shall be measured at
42、the inlet of thepressure regulator by installing a special fitting on the stove when required.8.4 A portable cook stove shall comply with the following requirements in the Standard for Portable CampCook Stoves for Use with Propane Gas, ANSI Z21.72-1982:a) 2.1 General, except 2.1.1(a) and (b).b) 2.3
43、Burner adjustments, 2.33 only.c) 2.7 Combustion (as modified in the Combustion Test, Section 9 ).d) 2.8 Burner operating characteristics.e) 2.9 Resistance to wind.f) 2.10 Temperatures (as modified in the Temperature Test, Section 10 ).8.5 A portable cook stove shall additionally comply with the foll
44、owing tests included in this outline:a) The Abnormal Pressure Operation Tests, Section 11. (This test is required only when thepressure regulator is not provided with over-pressure protection.)b) The Low Temperature Operation Test, Section 12.c) The Fuel Container Loading Endurance Test, Section 13.
45、d) The Stove Tilt/Slide Test, Section 14.e) The 10-Day Moist Ammonia-Air Stress Cracking Test, Section 15.f) The Drop Test, Section 16.NOVEMBER 9, 2001 SUBJECT 2191 98.6 Unless otherwise specified, each test shall consist of a series of three tests: one at normal inlet testpressure, one at reduced i
46、nlet test pressure, and one at increased inlet test pressure, as shown in Table8.1.9 Combustion Test9.1 Sample conditioning9.1.1 Prior to the test, the sample cook stove shall be operated at normal inlet pressure and input rate for24 hours total, with a 7-1/2 inch (191 mm) water-filled utensil place
47、d on a grate over the burner.9.1.2 Each cycle shall consist of an operating period of approximately 8 hours, followed by anon-operating period of 16 hours. Full fuel containers are to be installed in the appliance approximatelyevery 1-1/2 hours during the operating periods.9.2 Hood adjustment9.2.1 T
48、he water-filled utensil is to be placed on each burner grate. A flue collection hood, in accordancewith Figure 29.1 in the Standard for Gas-Fired Cooking Appliances for Recreational Vehicles, UL 1075,equipped with adjustable legs for height, is to be placed over the pan and burner. The burner is to
49、be firedand the hood lowered to the minimum height permitted by the burner grate or to the height slightly abovethe height that resulted in a noticeable change in the character of the burner flame. The area of the hoodoutlet is to be gradually reduced to obtain as high a carbon dioxide concentration as possible withoutaltering flame characteristics.9.3 Test Part I9.3.1 After the collection hood adjustment described in 9.2.1, the gas supply to the burner shall beinterrupted and the burner and water-filled utensil allowed to cool to room
