1、 WORLDWIDE ENGINEERING STANDARDS Test Procedure GMW14449 Testing the Force Fit of Exhaust Pipe Clamped Connections Copyright 2011 General Motors Company All Rights Reserved July 2011 Originating Department: GME Specification Center Page 1 of 4 1 Scope Note: Nothing in this standard supercedes applic
2、able laws and regulations. Note: In the event of conflict between the English and domestic language, the English language shall take precedence. 1.1 Purpose. Determining the force fit of exhaust system pipe connections in laboratory test. 1.2 Foreword. Not applicable. 1.3 Applicability. For all exha
3、ust system pipe connections which are connected by means of a clamp. 2 References Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. None 2.2 GM Standards/Specifications. GMW15261 3 Resources 3.1 Facilities. Not applicable. 3.2
4、Equipment. 3.2.1 Heating oven to condition the pipe connection to +600 C for 1 h. 3.2.2 Torsion testing device. 3.2.2.1 Data acquisition (X-Y recorder). 3.2.2.2 Torque load cell with a measuring range of (10 to 500) Nm. 3.2.2.3 Torque angle gauge with a measuring range of (0 to 90). 3.2.2.4 Leak mea
5、suring equipment according to GMW15261. 3.3 Test Vehicle/Test Piece. The test shall be performed on 5 new 300 mm long pipe sections manufactured under production conditions, the dimensions of which are the upper tolerance range, according to the drawing specifications. The surface properties of the
6、pipe sections shall correspond to the series production parts, as per the part drawing for the pipe. 3.4 Test Time. Calendar time: 1 weeks Test hours: 40 hours Coordination hours: 2 hours 3.5 Test Required Information. Not applicable. 3.6 Personnel/Skills. Not applicable. 4 Procedure 4.1 Preparation
7、. See paragraph 4.3. 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 GMW14449 Copyright 2011 General Motors Company All Rights Reserved July
8、 2011 Page 2 of 4 4.2 Conditions. 4.2.1 Environmental Conditions. Not applicable. 4.2.2 Test Conditions. Deviations from the 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
9、 Pairing the Pipe Sections. To pair the pipe sections, the 300 mm long sections of insert and push-on pipes shall be measured in the connection area. The outer lower (minimum) and upper (maximum) diameters of the insert pipe shall be determined. The inner lower (minimum) and upper (maximum) diameter
10、s of the push-on pipe shall be determined. The measured values shall be documented in Table 1. To pair the pipe sections, the tolerances of the insert and push-on pipes (column I in Table 1) shall be in the upper range. Table 1: Pipe Pairing Report Pipe wall thickness: Pipe material: Surface conditi
11、on: Pipe manufacturer A B C D E F G H I Insert Pipe Outer Diameter in mm Push-On Pipe Inner Diameter in mm Part no. min max Average value Part no. min max Average value Tolerance Nominalmin Note 1Nominalmax Note 1 Nominalmin Note 1 Nominalmax Note 1 Test no. of pipe - column A, E measured pipe diame
12、ter - column B, C, F, G column D = (B + C)/2 column H = (F + G)/2 column I = H D Note 1: Nominal value in accordance with CTS/part drawing 4.3.2 Mounting the Pipes. When mounting the pipes, which shall be performed according to the part drawing, the following shall be noted: a. the depth to which th
13、e insert pipe is inserted into the push-on pipe, b. the positioning of the clamp on the push-on pipe and c. the bolt tightening torque (Ma) of the clamp screw connection. 4.3.3 Measuring the Leakage Rate of the Pipe Connection. Determining the leakage rate of the pipe connection according to GMW1526
14、1. Determining the leakage rate shall be performed following paragraph 4.3.2. The permissible leakage rate can be taken from the SSTS/CTS/part drawing. The measured leakage rates shall be documented in Table 2. Copyright General Motors Company Provided by IHS under license with General Motors Compan
15、yNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14449 Copyright 2011 General Motors Company All Rights Reserved July 2011 Page 3 of 4 Table 2: Pipe Pairing Report Plug-in depth of the insert pipe: Tightening torque of the clam
16、p screw connection: Pipe manufacturer: Clamp manufacturer: Clamp drawing specification: Pipe Pairing (E/A) Leakage Rate of Plug-In Connection Pipe Torsional Moment (Slipping Moment) in Nm Residual Torque of Clamp Screw Connection in Nm Nominal Note 1 Nominal Note 1 (Nominal Note 1 - 30 %) E Test num
17、ber of the insert pipe. A Test number of the push-on pipe. Note 1: Nominal value in accordance with CTS/part drawing 4.3.4 Conditioning the Pipe Connection. According to paragraph 4.3.3, the pipe connection shall be conditioned for 1 h in the heating oven at +600 C. After conditioning, the pipe conn
18、ection shall be removed from the heating oven and allowed to cool naturally to room temperature of (+23 5) C. 4.3.5 Testing the Force Fit. The force fit of the pipe connection shall be determined in a torsion testing device at (+23 5) C following paragraph 4.3.4. The push-on pipe shall be fixed to t
19、he test device. A torsional moment up to 200 Nm maximum shall be applied to the insert pipe at a measuring rate of 45/minute to twist it. The slipping moment shall be obtained from the displayed torsion characteristic and documented in Table 2. Finally the residual torque shall be determined at the
20、clamp screw connection of the test part and documented in Table 2. 5 Data 5.1 Calculations. To ensure that statements made about the calculated leakage rates, pipe torsional moments and residual torques, with respect to the required nominal values, as per the SSTS/CTS/part drawing, are as reliable a
21、s possible, the data shall be evaluated using the statistical method of linear Gaussian distribution. 5.2 Interpretation of Results. The calculated results shall be compared with the specifications in the SSTS/CTS/part drawing and evaluated accordingly. 5.3 Test Documentation. The results shall be c
22、ompiled in a test report as follows. 5.3.1 Results Summary and Evaluation. x Brief evaluation of results (OK, NOK). x Test specification and, if required, any deviations. x Comparison of results with the specifications in the SSTS/CTS/part drawing. 5.3.2 Description of Test. x Description of test se
23、t-up with photo. x Brief description of testing machine. x Test equipment calibration. 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 GMW14
24、449 Copyright 2011 General Motors Company All Rights Reserved July 2011 Page 4 of 4 x Test device certification. 5.3.3 Presentation of Individual Results. x Presentation of individual results by Table 1 and Table 2. x The pipe torsional moments shall be represented in graph form as a function of tor
25、sion angle. x Characteristic data from the statistical evaluations (90 % value, scattering range (10 to 90) %). x Photo on which the plug-in connection and the position of the pipe clamp is clearly indicated. 6 Safety This standard may involve hazardous materials, operations, and equipment. This sta
26、ndard 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 Glossary. Not applicable.
27、7.2 Acronyms, Abbreviations, and Symbols. CTS Component Technical Specification OK Approved or Endorsed N O K Not Approved or Endorsed SSTS Subsystem Technical Specification VTS Vehicle Technical Specification 8 Coding System This standard shall be referenced in other documents, drawings, etc., as f
28、ollows: Test to GMW14446 9 Release and Revisions This standard was originated in September 2005. It was first approved by Global Exhaust Center in January 2006. It was first published in January 2006. Issue Publication Date Description (Organization) 1 JAN 2006 Initial publication. 2 JUL 2011 5 year
29、 refresh; transferred into new template; paragraphs 4.1.1 through 4.1.5 moved to paragraphs 4.3.1 through 4.3.5; GMW3149 replaced by GMW15261 Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
