1、 WORLDWIDE ENGINEERING STANDARDS Test Procedure GMW14503 Leak Test on Press Nuts Copyright 2012 General Motors Company All Rights Reserved November 2012 Originating Department: North American Engineering Standards Page 1 of 3 1 Scope Note: Nothing in this standard supercedes applicable laws and regu
2、lations. Note: In the event of conflict between the English and domestic language, the English language shall take precedence. 1.1 Purpose. Testing the leak-tightness of joints with press nuts. 1.2 Foreword. Not applicable. 1.3 Applicability. For all press nuts. 2 References Note: Only the latest ap
3、proved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. None 2.2 GM Standards/Specifications. GMW2 2.3 Additional References. Merck Item No. 108641, water detection paste N. 3 Resources 3.1 Facilities. Sleeves or pipe sections which can be positioned on the
4、 tested components in such a way that a water column of defined height is generated at the seal area to be tested. 3.2 Equipment. 3.2.1 Aids to detect the presence of water (e.g., Merck water detection paste N, Item no. 108641). 3.2.2 Absorbent paper which shows a clear change after contact with wat
5、er (indicator paper). Proprietary disposable paper towels, for example, are suitable as they remain wrinkled and sometimes show changes in color, even after they have dried out. 3.3 Test Vehicle/Test Piece. Depending on the condition of the component, the test can be performed either on the finished
6、 part or on specially prepared test parts (test part installed on test plates). If not otherwise specified in the test request documentation, an uncoated test panel made from sheet steel to GMW2-M-ST-S CR 3 shall be used. Thickness will vary depending on the press nut selected. 3.4 Test Time. Calend
7、ar time: 1 day Test hours: 1 to 3 hours Coordination hours: 2 hours 3.5 Test Required Information. The actual stress that the component is exposed to in its installation location shall be known and a corresponding guideline regarding water column height difference shall be defined. 3.6 Personnel/Ski
8、lls. Qualified personnel in Production and Quality Assurance. 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 GMW14503 Copyright 2012 Genera
9、l Motors Company All Rights Reserved November 2012 Page 2 of 3 4 Procedure 4.1 Preparation. 4.1.1 If required, the threaded hole shall be sealed off either by screwing a screw into the press nut, by counter holding with a suitable device (rubber coated plate or similar), or by other suitable measure
10、s. 4.1.2 Prior to the test, the test parts shall be stored for at least 4 h at +23 C 5 C. 4.2 Conditions. 4.2.1 Environmental Conditions. The test shall be performed at a temperature of +23 C 5 C. 4.2.2 Test Conditions. Deviations from the requirements of this standard shall have been agreed upon. S
11、uch requirements shall be specified on component drawings, test certificates, reports, etc. 4.3 Instructions. 4.3.1 The threaded hole (if present) is sealed off, as described in 4.1.1. The sleeve is placed in position and sealed off. The water detection substance is applied to the underside of the t
12、est part. 4.3.2 The test part is positioned on an auxiliary device in such a way that the water column stands vertically on the upper side of the test part and that H 50 mm to 150 mm tall gap remains underneath. Indicator paper is placed under the test part (see Figure 1). Tightness classification i
13、s specified in Table 1. 1 Fluid level 2 Sleeve 3 Sealing compound 4 Panel 5 Water detection paste 6 Test part Note: Figure 1 shows the test part with threaded hole sealed off. Figure 1: Test Setup Table 1: Tightness Classification. Note 1, Note 2 Tightness Class Height of Water Column mm Test Time (
14、minutes) A (Watertight to still water) Note 1 50 60 B (Watertight to spray) Note 2 5 5 Note 1: No leakage after exposure to still water (height of 50 mm) for 60 minutes. Note 2: No leakage after exposure to water spray (height of 5 mm) for 5 minutes. Copyright General Motors Company Provided by IHS
15、under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14503 Copyright 2012 General Motors Company All Rights Reserved November 2012 Page 3 of 3 5 Data 5.1 Calculations. Not applicable. 5.2 Int
16、erpretation of Results. At the end of the test period, none of the indicators shall show any evidence of water leaks. 5.3 Test Documentation. With reference to this test procedure, the test results shall be summarized in a test report. 6 Safety This standard may involve hazardous materials, operatio
17、ns, and equipment. This standard does not propose to address all the safety problems associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. 7 Notes 7.1
18、 Glossary. Not applicable. 7.2 Acronyms, Abbreviations, and Symbols. GSSLT Global Subsystem Leadership Team 8 Coding System This standard shall be referenced in other documents, drawings, etc., as follows: Test to GMW14503 9 Release and Revisions This standard was originated in October 2005. It was
19、first approved by the Fastening & Sealing Test Lab Global Subsystem Leadership Team (GSSLT) in September 2006. It was first published in January 2007. Issue Publication Date Description (Organization) 1 JAN 2007 Initial publication. 2 NOV 2012 Five year refresh of document. (Fastening & Sealing Test Lab GSSLT) Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
