1、WORLDWIDEENGINEERINGSTANDARDSTest Procedure GMW14846Non-Metallic Fuel Tank Fuel Permeability Copyright 2012 General Motors Company All Rights ReservedOctober 2012 Originating Department: North American Engineering Standards Page 1 of 81 ScopeNote: Nothing in this standard supercedes applicable laws
2、and regulations.Note: In the event of conflict between the English and domestic language, the English language shall takeprecedence.1.1 Purpose. To precondition a non-metallic diesel or gasoline primary or secondary fuel tank for otherspecifications and to evaluate the fuel permeability of these tan
3、ks.1.2 Foreword. This procedure can be used to show compliance with European regulations:x 70/221/EECx ECE 34Note: Fuel tanks which have completed this specification are required for use in specifications GMW14847and GMW14848.1.3 Applicability. This procedure applies to all passenger cars, multipurp
4、ose passenger vehicles (MPV), andtrucks which have a primary or secondary non-metallic diesel or gasoline fuel tank.2 ReferencesNote: Only the latest approved standards are applicable unless otherwise specified.2.1 External Standards/Specifications.70/221/EEC ECE 342.2 GM Standards/Specifications.GM
5、W14847 GMW14848 GMW153113 Resources3.1 Facilities. The test facility must be able to store fuel tanks (with fuel) for up to eight (8) weeks in atemperature controlled room.3.1.1 The test facility must have fuel dispensing equipment and safety equipment (fume detection equipment,spill clean equipment
6、, etc.) needed to handle fuel.3.1.2 The test site must have fire fighting equipment available which would be able to control any potential fire.This equipment should include personal protection equipment (respirator, clothing, etc.)3.2 Equipment. A fuel tank holding fixture is used for mounting the
7、tank in simulated vehicle position.3.2.1 Storage room which has the capability of maintaining ambient temperatures of 23 C 2 C(73.4 F 3.6 F) or 40 C 2 C (104.0 F 3.6 F) for eight (8) weeks.3.2.2 Weighing equipment capable of measuring (in grams) the tank filled with fuel.Note: All instrumentation is
8、 to be calibrated as required; record instrumentation details and date of calibrationon Appendix A, Data Sheet A1, unless the information is otherwise preserved in the testing laboratory records.3.3 Test Vehicle/Test Piece. Fuel System under Test includes the fuel tank and all attached accessories.3
9、.3.1 Test Fuel. The use of unleaded premium gasoline as per GMW15311 (Specification for Fuel Storageand Handling Subsystem) section titled Test Fuels, is required.3.4 Test Time. Not applicable.Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo
10、reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14846 Copyright 2012 General Motors Company All Rights ReservedOctober 2012 Page 2 of 83.5 Test Required Information. Not applicable.3.6 Personnel/Skills. Personnel involved in the fuel handing an
11、d testing portion of this procedure shall havebeen trained in the use of the firefighting and personal protection equipment available on site (reference 3.1.2).4 Procedure4.1 Preparation. Install the fuel tank onto the fuel tank holding fixture in simulated vehicle position. Do not sealthe fuel tank
12、.4.1.1 Fill the fuel tank to 50% of the rated capacity with test fuel and store the fuel tank at an ambienttemperature of 40 C 2 C (104.0 F 3.6 F) until the weight loss per 24 h becomes constant. Record theday/time, weight information and the calculations on Data Sheet A3, found in Appendix A.4.1.2
13、Remove the stale fuel and refill to 50% of the rated capacity with fresh test fuel. Seal all openings toavoid any vapor or liquid losses.4.1.3 Store the fuel tank at an ambient temperature of 40 C 2 C (104.0 F 3.6 F). When the temperatureof the fuel reaches ambient temperature, vent any excess press
14、ure or vacuum. Reseal the tank.4.1.4 Plot fuel system weight loss versus time on Appendix A, Data Sheet A4, to determine when the fuel tankis ready for the permeability test.Note: All fire fighting equipment must be readily available during the fuel handling and testing portion of thisprocedure.Note
15、: The weight loss is constant when the last three points on the plotted line are horizontal.4.2 Conditions. Refer to 3.1 and 3.2.1.4.2.1 Environmental Conditions.4.2.2 Test Conditions. Deviations from the requirements of this standard shall have been agreed upon. Suchrequirements shall be specified
16、on component drawings, test certificates, reports, etc.4.3 Instructions. Record the day/time and initial weight of the fuel on Appendix A, Data Sheet A5.4.3.1 After a storage period of eight (8) weeks, at this constant temperature, reweigh the fuel tank and test fuel.Record the final day/time and we
17、ight on Appendix A, Data Sheet A5.Note: Intermediate weighing and calculations may be made at any time to monitor weight loss and avoid lossof test time due to unexpected results.4.3.2 Calculate the average loss of fuel in grams per 24 h and record on Appendix A, Data Sheet A5.4.3.3 If the average l
18、oss of fuel in grams per 24 h is greater than 20 g/24 h, repeat the permeability test on thesame fuel tank, starting with 4.1.4, with the exception that the ambient temperature must be 23 C 2 C(73.4 F 3.6 F).4.3.4 If needed, record data related to this second permeability test on Appendix A, Data Sh
19、eet A5.Note: During this test, the fuel tank shall lose less than 20 g/24 h for the first permeability test or 10 g/24 h forthe second permeability test.5 Data5.1 Calculations. Not applicable.5.2 Interpretation of Results. Not applicable.5.3 Test Documentation. Record all pertinent test results on t
20、he supplied data sheets, found in Appendix A.6 SafetyThis standard may involve hazardous materials, operations, and 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 safet
21、y and health practices and determine the applicability of regulatory limitations priorto use.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
22、 GMW14846 Copyright 2012 General Motors Company All Rights ReservedOctober 2012 Page 3 of 87 Notes7.1 Glossary. Not applicable.7.2 Acronyms, Abbreviations, and Symbols.MPV Multipurpose Passenger Vehicle8 Coding SystemThis standard shall be referenced in other documents, drawings, etc., as follows:Te
23、st to GMW148469 Release and RevisionsThis standard was originated in November 2005. It was first approved by the Global Chassis Powertrain Teamin January 2006. It was first published in February 2006.Issue Publication Date Description (Organization)1 FEB 2006 Initial publication.2 OCT 2008 Reference
24、 to ECE R34 removed and replaced with 70/221/EEC in 1.2.1 and 2.1.Removed the 4 week limit in 4.1.3. Removed reference to “Export”. (PowertrainIntegration)3 OCT 2012 Revise to current template. (Fuel Storage and Handling GSSLT)Copyright General Motors Company Provided by IHS under license with Gener
25、al Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14846 Copyright 2012 General Motors Company All Rights ReservedOctober 2012 Page 4 of 8Appendix AData Sheet A1: Instrument CalibrationReport NumberSubmit this dat
26、a sheet with the other data sheets when the information is not otherwise preserved in thetesting laboratory records.Test Procedure Number Test DateInstrument DescriptionInstrumentNumberCalibrationDateNextCalibrationDue Date1234567891011121314151617181920Recorded by Date(Signature)Copyright General M
27、otors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14846 Copyright 2012 General Motors Company All Rights ReservedOctober 2012 Page 5 of 8Data Sheet A2: Fuel S
28、ystem Under TestYear Model Gasoline DieselRated Fuel Capacity Liters (gal)Description of Fuel System Under Test and Fuel Tank MaterialExperimentalPrototypePilotProductionRecorded by Date(Signature)Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for Resal
29、eNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14846 Copyright 2012 General Motors Company All Rights ReservedOctober 2012 Page 6 of 8Data Sheet A3: PreconditioningPreconditioning Fuel Tank:Test Procedure No.:Test Date:Fuel Tank Serial No.
30、 Diesel GasolineActual Volume of Fuel used During Test Liters (gal)Actual Temperature Used During Test C (F)Date/Time Weight WeightChangeWeightChange/24 hDate/Time Weight WeightChangeWeightChange/24 hRecorded by Date(Signature)Copyright General Motors Company Provided by IHS under license with Gener
31、al Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14846 Copyright 2012 General Motors Company All Rights ReservedOctober 2012 Page 7 of 8Data Sheet A4: Weight Change vs. TimeCopyright General Motors Company Provi
32、ded by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14846 Copyright 2012 General Motors Company All Rights ReservedOctober 2012 Page 8 of 8Data Sheet A5: Permeability TestDevelopm
33、ent/ValidationTest No.:Test Date:Fuel Tan Serial No.Permeability Test: (At ambient temperature of 40 C 2 C (104.0 F 3.6 F)Actual Temperature Used During Test C (F)Date/Time of Start of TestActual Initial Weight of Fuel Tank gramsDate/Time of End of TestActual Final Weight of Fuel Tank gramsChange in
34、 Weight gramsHours of Test hoursCalculated Weight Loss per 24 h grams/24 hPermeability Test: (At ambient temperature of 23 C 2 C (73.4 F 3.6 F)Actual Temperature Used During Test C (F)Date/Time of Start of TestActual Initial Weight of Fuel Tank gramsDate/Time of End of TestActual Final Weight of Fuel Tank gramsChange in Weight gramsHours of Test hoursCalculated Weight Loss per 24 h grams/24 hRecorded by Date(Signature)Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
