GMW GMW14292-2012 Determination of Deposits in the Fuel System Issue 2 English.pdf
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1、 WORLDWIDE ENGINEERING STANDARDS Test Procedure GMW14292 Determination of Deposits in the Fuel System Copyright 2012 General Motors Company All Rights Reserved September 2012 Originating Department: North American Engineering Standards Page 1 of 3 1 Scope Note: Nothing in this standard supercedes ap
2、plicable laws and regulations. Note: In the event of conflict between the English and domestic language, the English language shall take precedence. 1.1 Purpose. This test procedure describes the determination of substances from fuel hoses and other elastomeric parts of the fuel system which could f
3、orm deposits on copper and copper alloys. 1.2 Foreword. Not applicable. 1.3 Applicability. All gasoline fuel systems. 2 References Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. ISO 4794 2.2 GM Standards/Specifications. GMW1
4、4914 3 Resources 3.1 Facilities. Not applicable. 3.2 Equipment. 3.2.1 Erlenmeyer flask 250 ml. 3.2.2 Round-bottom flask 250 ml. 3.2.3 Folded filter diameter 125 mm. 3.2.4 Glass funnel. 3.2.5 Glass beads diameter 1.5 mm. 3.2.6 Copper chips. 3.2.7 Methanol modified test fuel to GMW14914, Table 1: Test
5、 Fuel for Gasoline Application, GM Europe (GME). 3.2.8 Glass filter crucible Number 4 according to ISO 4794, porosity 10 m-6 to 16 m-6. 3.2.9 Balance with an accuracy of 0.1 mg. 3.2.10 Water jet pump. 3.2.11 Desiccator. 3.3 Test Vehicle/Test Piece. 3.3.1 The elastomers to be tested shall be cut into
6、 small cubes with 2 mm to 3 mm width. For one test, approximately 20 g of elastomer are required. 3.3.2 For initial sample approval and arbitration purposes at least three (3) tests should be performed. For routine quality control purpose, one test should be performed. 3.4 Test Time. Not applicable.
7、 3.5 Test Required Information. Not applicable. 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 GMW14292 Copyright 2012 General Motors Compa
8、ny All Rights Reserved September 2012 Page 2 of 3 3.6 Personnel/Skills. Not applicable. 4 Procedure 4.1 Preparation. For initial sample approval and arbitration purposes, the minimum time period between manufacturing and testing of elastomers shall be seven (7) days. For routine quality control purp
9、oses, the time period shall be a minimum of 72 h. Before testing, the test pieces shall be stored at a temperature of +23 C 5 C for at least 8 h and shall be free from strain during this period. 4.2 Conditions. 4.2.1 Environmental Conditions. Not applicable. 4.2.2 Test Conditions. Deviations from th
10、e requirements of this standard shall have been agreed upon. Such requirements shall be specified on component drawings, test certificates, reports, etc. 4.3 Instructions. 4.3.1 Before testing, all glassware shall be rinsed with test fuel per GMW14914. 4.3.2 Twenty (20) g of the test pieces, 10 g of
11、 the copper chips, and 100 ml test fuel to GMW14914 shall be filled together with two (2) glass beads into the round bottom flask and shall be boiled 1 h 0.1 h on reflux. 4.3.3 After 1 h 0.1 h of cooling down, the fuel shall be filtered through the folded filter into the Erlenmeyer flask. 4.3.4 The
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