1、WORLDWIDEENGINEERINGSTANDARDSTest Procedure GMW14680Determination of Fuel Permeability of Hoses at High Temperature Copyright 2012 General Motors Company All Rights ReservedOctober 2012 Originating Department: North American Engineering Standards Page 1 of 61 ScopeNote: Nothing in this standard supe
2、rcedes applicable laws and regulations.Note: In the event of conflict between the English and domestic language, the English language shall takeprecedence.1.1 Purpose. The object of this test procedure is to determine the fuel permeability of hoses.1.2 Foreword. Not applicable.1.3 Applicability. Not
3、 applicable.2 ReferencesNote: Only the latest approved standards are applicable unless otherwise specified.2.1 External Standards/Specifications.DIN 50011-11 IEC 60079-0 SAE J30DIN 50011-12 ISO 1817 SAE J15272.2 GM Standards/Specifications.GMW149143 Resources3.1 Facilities. Not applicable.3.2 Equipm
4、ent.3.2.1 Test Equipment.3.2.1.1 Test Equipment for Test Methods A, B, and C.3.2.1.1.1 Heating oven capable of maintaining the required temperatures within the specified tolerances, e.g,to DIN 50011-11 and DIN 50011-12; with explosion proof interior structure to IEC 60079-0. The heating ovenshall ha
5、ve an air ventilation rate of twice per minute minimum.3.2.1.1.2 Capable Analytical Balance.3.2.1.1.3 Test Vessel. The volume of the test vessel shall be about four (4) to five (5) times higher than thevolume of the test hose. See Figure 1.3.2.1.1.4 Test Fuel to be used for all preconditioning of ma
6、terials, and all permeation measurements, is to beGasoline test fuel per GMW14914, GME (General Motors Europe), unless otherwise specified.3.2.1.1.5 Preparation of Test Assembly. The test piece (section of hose) shall be connected to one end ofthe test vessel and the other end shall be sealed with a
7、 blanking plug, see 3.2.1.1.3.Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14680 Copyright 2012 General Motors Company All Rights Rese
8、rvedOctober 2012 Page 2 of 61 Ball lock valve2 Brazed3 Blanking plugFigure 1: Test Vessel3.2.1.2 Test Equipment for Test Methods D and E. The apparatus used to conduct the test shall be asindicated in SAE J1527, 16.2, Rate of Fuel Permeation, with modifications for the dimensions of hose,reservoir,
9、and fuel volume as listed in Table 1. Selection of dimensions for hose length, fuel volume, andreservoir volume is dependent on the Inner Diameter (ID) of the hose being measured. For hoses that do nothave an ID listed in Table 1, the closest smaller hose ID shall be selected from the table for the
10、determinationof these test samples and apparatus dimensions. Fuel to be used for all preconditioning of materials, and allpermeation measurements, is to be CE10 (90% Liquid C to ISO 1817 plus 10% ethanol) unless otherwisespecified. Fuel temperature is to be maintained at 40 C 2 C during the equilibr
11、ium pre-conditioning of thehose and during the permeation testing of the hose. Permeation test sample and fixture must be sealed beforetemperature of fuel is increased to avoid significant loss of volatiles prior to permeation measurements. Properhot fuel handling safety procedures must be utilized.
12、3.3 Test Vehicle/Test Piece.3.3.1 Test Material.3.3.1.1 Test Material for Methods A, B, and C. Test piece is a section of the hose with a free hose length ofapproximately 100 mm at the test. Free hose lengths of 0.05, then repeat 4.3.2.3 to generate a fourth permeation measurement. Repeat the calcul
13、ationsper 4.3.2.4 on the last three (3) permeation measurement values generated (discarding the first valuecalculated), to calculate the Coefficient of Variation for the last three (3) permeation measurements made asthe basis for the Coefficient of Variation calculation. If the Coefficient of Variat
14、ion is now 0.05, continue the fuel exposure/weight determination process of 4.3.2.3 and the calculations of 4.3.2.4 untilthe Coefficient of Variation are 0.05 and the value for the permeation in the sample confirmed, always usingthe last three (3) permeation measurements made as the basis for the Co
15、efficient of Variation calculation.4.3.3 Vapor Phase Equilibrium Determination.4.3.3.1 Using the same test hose specimen and apparatus used for the liquid fuel permeation determination,repeat the fuel exposure method as described in 4.3.2.1, substituting the method described in 4.3.1.5.1 for thefuel
16、 exposure, rather than using 4.3.1.4.1. The length of time necessary to reach an equilibrium state of fuelvapor may be 500 h.4.3.3.2 Repeat the test as described in 4.3.2.2 through 4.3.2.5, continuing to substitute the fuel vapor exposuremethod per 4.3.3 for the liquid fuel exposure method descried
17、in 4.3.2.4.3.3.3 When the fuel vapor permeation rate has been confirmed as having reached equilibrium COV 0.05,report the last permeation measurement as the fuel vapor permeation value for the sample.5 Data5.1 Calculations. Not applicable.Copyright General Motors Company Provided by IHS under licens
18、e with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14680 Copyright 2012 General Motors Company All Rights ReservedOctober 2012 Page 5 of 65.2 Interpretation of Results. Not applicable.5.3 Test Document
19、ation.5.3.1 Evaluation and Rating.5.3.1.1 Methods A, B, and C. The difference between the mass of the system before and after every test shallbe calculated. The change of the mass shall be related to an area of 100 cm2 of the internal surface of the freehose length. The test result is the maximum va
20、lue of all tests performed.The test result shall be expressed with reference to this test method and the test fuel, in grams with anaccuracy of 0.1 g, in relation to 100 cm2 and 24 h.5.3.1.2 Methods D and E. Evaluate per SAE J1527.6 SafetyThis standard may involve hazardous materials, operations, an
21、d equipment. This standard does not propose toaddress all the safety problems associated with its use. It is the responsibility of the user of this standard toestablish appropriate safety and health practices and determine the applicability of regulatory limitations priorto use.7 Notes7.1 Glossary.
22、Not applicable.7.2 Acronyms, Abbreviations, and Symbols.COV Coefficient of VariationGME General Motors EuropeID Inner DiameterIEC International Electrotechnical CommissionSAE SAE International8 Coding SystemThis standard shall be referenced in other documents, drawings, etc., as follows:Test to GMW1
23、4680Example:Fuel Permeability to GMW14680 - B - Gasoline test fuel per GMW14914, GME 14 g/100 cm2 24 h maximum.Where:Fuel Permeability = DesignationGMW14680 = Test MethodB = Method to 5.3Gasoline test fuel per GMW14914 = Test Fuel14 g/100 cm2 24 h maximum = Requirement9 Release and RevisionsThis sta
24、ndard was originated in October 2005. It was first approved by GM Global Material Engineering inMarch 2007. It was first published in July 2007.Issue Publication Date Description (Organization)1 JUL 2007 Initial publication.2 OCT 2012 5 Year Refresh.(Elastomers Global Subsystem Leadership Team)Copyr
25、ight General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14680 Copyright 2012 General Motors Company All Rights ReservedOctober 2012 Page 6 of 6Appendi
26、x APermeability Test for Low Permeability Fuel Filler Hose: DefinitionsAverage = ( Permeation Determinations)/nn = number of measurements taken (per 4.3.2.4, n = 3)Variance = ( (Permeation Determination -average) 2/n-1)Coefficient of Variation = (Variation) 1/2/AverageCopyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
