1、July 15, 20021SUBJECT 1136OUTLINE OF INVESTIGATIONFORMarine Rigid and Flexible Air DuctingIssue: 1JULY 15, 2002COPYRIGHT 2002 UNDERWRITERS LABORATORIES INC.JULY 15, 2002SUBJECT 11362No Text on This PageCONTENTSFOREWORD 4INTRODUCTION1 Scope .52 Units of Measurement .53 Components 54 Undated Reference
2、s 6CONSTRUCTION5 General 6PERFORMANCE6 General 67 Air Flow Resistance Test 68 Chemical Resistance Test .79 Strength Tests 89.1 General .89.2 Tensile test 89.3 Collapse test .89.4 Vapor-tightness test 89.5 Kink test .910 Temperature Test 910.1 General 910.2 High temperature test 910.3 Low temperature
3、 test 911 Vertical Flame Test 9MARKING12 General 11INSTALLATION INSTRUCTIONS13 General 12JULY 15, 2002 SUBJECT 1136 3FOREWORDA. This Outline of Investigation contains basic requirements for products covered by UnderwritersLaboratories Inc. (UL) under its Follow-Up Service for this category within th
4、e 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 desirable.B. The observance of these requirements by a manufacturer is one of the conditions of the continuedcoverage of th
5、e 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, when examined and tested, it is found to have other featureswhich impair the level of safety contemplated by these requirem
6、ents.D. A product that contains features, characteristics, components, materials, or systems new or differentfrom those covered by the requirements in this Outline of Investigation, and that involves a risk of fire orof electric shock or injury to persons shall be evaluated using appropriate additio
7、nal component andend-product requirements to maintain the level of safety as originally anticipated by the intent of thisOutline of Investigation. A product whose features, characteristics, components, materials, or systemsconflict with specific requirements or provisions of this Outline of Investig
8、ation does not comply with thisOutline of Investigation. Revision of requirements shall be proposed and adopted in conformance with themethods employed for development, revision, and implementation of this Outline of Investigation.E. UL, in performing its functions in accordance with its objectives,
9、 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 due consideration to the necessary limitations of practicaloperation and state of the art at the time the Outline of Inv
10、estigation 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 liability for damages, including consequential damages, arising out of or inconnection with the use, interpretation of, or relian
11、ce 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 shall be employed in conducting such tests.JULY 15, 2002SUBJECT 11364INTRODUCTION1 Scope1.1 These requirements cover rigid an
12、d flexible air ducting intended to provide an air flow connectionbetween a ventilating fitting or blower and the bilge spaces or other enclosed spaces of a boat.1.2 The ducting covered by these requirements is intended to be installed in accordance with themanufacturers instructions and in accordanc
13、e with the applicable requirements of the Fire ProtectionStandard for Pleasure and Commercial Motor Craft, ANSI/NFPA 302, the American Boat and YachtCouncil, Inc., or the United States Coast Guard.1.3 These requirements do not cover ducting intended for use on heating systems or for any applicationi
14、nvolving air flow velocities in excess of 5000 feet per minute (25.4 m/s).2 Units of Measurement2.1 Values stated without parentheses are the requirement. Values in parentheses are explanatory orapproximate information.3 Components3.1 Except as indicated in 3.2, a component of a product covered by t
15、his outline shall comply with therequirements for that component.3.2 A component is not required to comply with a specific requirement that:a) Involves a feature or characteristic not required in the application of the component in theproduct covered by this outline; orb) Is superseded by a requirem
16、ent in this outline.3.3 A component shall be used in accordance with its rating established for the intended conditions ofuse.3.4 Specific components are incomplete in construction features or restricted in performance capabilities.Such components are intended for use only under limited conditions,
17、such as certain temperatures notexceeding specified limits, and shall be used only under those specific conditions.JULY 15, 2002 SUBJECT 1136 54 Undated References4.1 Any undated reference to a code or standard appearing in the requirements of this outline shall beinterpreted as referring to the lat
18、est edition of that code or standard.CONSTRUCTION5 General5.1 Ducting shall be constructed of nonporous, corrosion resistant material. A nonmetallic material usedin the construction of ducting shall not have a flame spread in excess of 1 foot per minute (0.005 m/s).See Vertical Flame Test, Section 1
19、1.5.2 The construction of ducting shall be such that connections are made to blowers or ventilating fittingswith standard clamps or with other means that are equivalent in tightness and strength.PERFORMANCE6 General6.1 All tests are to be conducted with the ducting stretched to its normal length. Th
20、e normal length of aflexible duct is to be determined by measurement after a 2-foot (610-mm) length of collapsed ducting hasbeen vertically suspended from one end for 24 hours at 25C.7 Air Flow Resistance Test7.1 When tested in accordance with 7.2 7.4, the air resistance of flexible or rigid ducting
21、 shall notexceed the applicable value specified in Table 7.1.7.2 A 10 foot (3.1 m) long sample of ducting is to be connected to the discharge port of a blower testchamber so that all discharge air passes through the test section. The connection at the chamber is toprovide for a smooth air flow path
22、between the chamber and duct, and the duct is to be supported so asto be substantially straight throughout its length.Table 7.1Air resistance at 1000 fpm air flowDuct diameter Duct cross-sectional area Maximum resistanceinches (mm) square inches (cm2) inches of water/100 ft.(Pa/m)2 (51) 3.14 (20.3)
23、2.0 (498)3 (76) 7.07 (45.6) 1.5 (373)4 (102) 12.6 (81.1) 1.25 (311)5 (127) 19.6 (126.6) 1.00 (249)JULY 15, 2002SUBJECT 113667.3 A calibrated blower is to be adjusted so that the average velocity of air flowing through the duct is1000 feet per minute (5.08 m/s). When the required air flow is attained
24、, the static pressure of the testchamber alone is to be recorded. The resistance per 100 feet (30.5 m) of ducting is to be calculated asfollows:R = (SP1-SP2) (100/L)Where:R = Resistance of the ducting per 100 feet (30.5 m).SP1= Static pressure of test chamber plus the length of ducting.SP2= Static p
25、ressure of test chamber alone.L = Length of ducting under test in feet (m x 3.28).7.4 The test is to be repeated with a single 90 degree bend having a radius equal to the duct diameteror the minimum radius specified by the manufacturer, in the center of the sample. The duct is to besupported and sub
26、stantially straight throughout its length, other than at the 90 degree bend.8 Chemical Resistance Test8.1 Ducting shall show no evidence of delamination or deterioration of the materials to the degree that itdoes not function as intended when tested as described in 8.3 8.5.8.2 Swelling of the materi
27、al that does not involve structural deterioration meets the intent of therequirement when the material, after being cleaned, returns to within 10 percent of its original thicknessafter being dried in a circulating air oven at 50C (122F) for 4 hours.8.3 Five sample sections of the ducting are to be s
28、ubmerged so as to wet both the inside and outsidesurfaces of the samples for 100 hours at 23 2C (73 4F); one sample being submerged in each of thefollowing:a) Salt water (5 percent by weight) solution of sodium chloride in distilled water);b) Fresh water;c) Engine oil (SAE No. 30 Type ML);d) Bilge s
29、olvent (commercial products); ande) No. 2 diesel fuel.8.4 In addition to the immersions specified in 8.3, a section of ducting not less than 2 feet (610 mm) inlength is to be suspended over a tray and doused 20 times with ASTM Reference Fuel A (the compositionto be as specified in the Standard Test
30、Method Test for Rubber Property , Effect of Liquids, ASTM D471).The sample is to be allowed to dry for at least 1 hour prior to each dousing. The test is then to be repeatedusing ASTM Reference Fuel C, and then is to be repeated using standard denatured ethyl alcohol (galleystove fuel).JULY 15, 2002
31、 SUBJECT 1136 78.5 The samples then are to be examined for compliance with 8.1.8.6 CAUTION Testing with fuels is hazardous because of the presence of extremely flammable vapors.It is recommended that equipment for the removal of these vapors be provided.9 Strength Tests9.1 General9.1.1 Ducting shall
32、 not rupture, collapse, kink, or show evidence of delamination or porosity whensubjected to the tests described in 9.2.1 9.5.2.9.2 Tensile test9.2.1 A sample section of the ducting is to be fitted with plugs in each end and the sample clamped tothe adapter plugs. The plugs are to be used to apply an
33、 equally distributed tensile load to the sample.There is to be approximately 1 foot (305 mm) of ducting between the inner ends of the plugs at the startof the test.9.2.2 A tensile load is to be applied to the adapter plugs and gradually increased until the force on thesample equals 50 pounds (222 N)
34、, and the load then is to be maintained for 5 minutes.9.3 Collapse test9.3.1 A sample of ducting not less than 4 feet (1.2 m) long is to be plugged at both ends and subjectedfor 5 minutes to an internal vacuum of 4 inches of water (995.2 Pa) through a fitting in one end plug.During the test, the end
35、 plugs are to be secured to prevent longitudinal collapse of the sample.9.4 Vapor-tightness test9.4.1 The samples used in the tests specified in 9.2.1 9.3.1 are to be pressurized to 4 inches of water(995.2 Pa) while submerged in water to a depth sufficient to maintain the tops of the samplesapproxim
36、ately 2 inches (50.8 mm) below the surface.9.4.2 The presence of air bubbles along the duct surface is to constitute evidence of porosity.JULY 15, 2002SUBJECT 113689.5 Kink test9.5.1 When tested as described in 9.5.2, a duct shall not break, tear, or separate, and the bending shallnot result in a re
37、duction in the internal cross sectional area of the duct in excess of 20 percent.9.5.2 A length of flexible ducting is to be bent into a complete U-shape having the minimum radiusspecified by the manufacturer.10 Temperature Test10.1 General10.1.1 Ducting formed of nonmetallic material shall not have
38、 a change in cross-sectional dimension inexcess of 5 percent or crack, split, or otherwise deteriorate to the degree that it does not function asintended when subjected to the tests described in 10.2.1 10.3.2.10.2 High temperature test10.2.1 FLEXIBLE DUCTING A length of the nonmetallic ducting is to
39、 be hung in a heat chamber at atemperature of 85C (185F) for 7 hours. The ducting is to be supported only at the ends so as to form aU-shape.10.2.2 RIGID DUCTINGA4foot (1.2 m) length of nonmetallic ducting is to be placed horizontally inheat chamber at a temperature of 85C (185F) for 7 hours.10.3 Lo
40、w temperature test10.3.1 A 1 foot (305 mm) length of flexible or rigid nonmetallic ducting and a mandrel having a diameterequal to the inner diameter of the sample are to be placed in a cold chamber at a temperature of minus30C (minus 22F) for 48 hours.10.3.2 Upon removal from the cold chamber, the
41、sample is to be wrapped 180 degrees around themandrel specified in 10.3.1.11 Vertical Flame Test11.1 Ducting formed of nonmetallic material shall not have a vertical flame spread in excess of 1 foot perminute (0.005 m/s) when tested as described in 11.2 11.8.11.2 A 4 foot (1.2 m) length of duct is t
42、o be used for the test.11.3 The test is to be conducted in a three-sided enclosure that is 12 inches (0.30 m) wide, 14 inches(0.36 m) deep, and 54 inches (1.37 m) high. The top and front of the enclosure are to be open. Thesample is to be secured with its longitudinal axis vertical in the center of
43、the enclosure. See Figure 11.1.This is generated text for figtxt.JULY 15, 2002 SUBJECT 1136 9Figure 11.1Essential dimensions of apparatus and specimenProportions exaggerated for clarity of detailsJULY 15, 2002SUBJECT 11361011.4 A Tirrill gas burner to which a gas pilot light is attached is to be use
44、d to supply the flame. The barrelof the burner is to extend 4 inches (102 mm) above the air inlets and its inside diameter is to be 3/8 inch(9.5 mm). While the barrel is vertical, the overall height of the flame is to be adjusted to 5 inches (127mm). The blue inner cone is to be 1-1/2 inches (38 mm)
45、 high. Without disturbing the adjustments for theheight of the flame, the valves supplying gas to the burner and pilot flame are to be closed.11.5 A wedge to which the base of the burner is secured is to be provided for tilting the barrel 20 degreesfrom the vertical while the longitudinal axis of th
46、e barrel remains in a vertical plane. The burner is to besecured to the wedge and the assembly is to be placed in an adjustable jig that is attached to the floor ofthe enclosure. The jig is to be adjusted laterally (see Figure 11.1) to place the longitudinal axis of thebarrel in the same vertical pl
47、ane as the longitudinal axis of the sample. The plane is to be parallel to thesides of the enclosure. The jig is also to be adjusted toward the rear or front of the enclosure (see Figure11.1) to position point A (which is the intersection of the longitudinal axis of the barrel with the plane ofthe t
48、ip of the barrel) 1-1/2 inches (38 mm) from point B, at which the extended longitudinal axis of thebarrel meets the outer surface of the sample. Point B is the point at which the tip of the blue inner conewill touch the sample. The sample is to be adjusted vertically to prevent point B from being an
49、y closer than3 inches (76 mm) to the lower end of the sample.11.6 The room and hood in which the test is conducted are to be ventilated, and drafts are to beprevented from affecting the flame.11.7 The valve supplying gas to the pilot is to be opened and the pilot flame lit.11.8 The valve supplying gas to the burner is to be opened to apply the flame to the sampleautomatically, the valve held open for 15 seconds, and then closed.MARKING12 General12.1 Air ducting shall be permanently and legibly marked at not more than 10-foot (3-m) intervals with:a) The manufac
