SAE J2494-3-2002 Performance Requirements for SAE J844 Non-metallic Air Brake Tubing and Push to Connect Fitting Assemblies Used in Vehicular Air Brake Systems.pdf
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1、SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefr
2、om, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions. Copyright 2002 Society of Automotive Engineers, Inc. All rights reserved. No part of
3、this publication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE. TO PLACE A DOCUMENT ORDER:Tel: 877-606-7323 (inside USA and Canada) Tel: 724-776-4
4、970 (outside USA) Fax: 724-776-0790 Email: custsvcsae.org SAE WEB ADDRESS:http:/www.sae.org SURFACE VEHICLE 400 Commonwealth Drive, Warrendale, PA 15096-0001 STANDARD J2494-3 ISSUED JUL2002 Issued2002-07 Performance Requirements for SAE J844 Non-metallic Air Brake Tubing and Push to Connect Fitting
5、Assemblies Used in Vehicular Air Brake Systems 1.ScopeThis SAE Standard is intended to establish uniform performance criteria and methods of testing push to connect tube fittings, with SAE J844 air brake tubing as used in vehicular air brake systems. The specific tests and performance criteria appli
6、cable to the tubing are set forth in SAE J844. The test values contained in this performance standard are for test purposes only. For environmental and usage limitations, see SAE J844. 1.1General Requirements a.Test temperature shall use 3 C as the test tolerance range. b.Dry Air shall be a minimum
7、of 50 C dew point c.Tubing shall be cut square at 90 degrees 7 degrees d.Precondition all test samples at 700 kPa 70 kPa for 30 s without any leakage. e.New samples shall be used for all tests. 2.References 2.1Applicable PublicationsThe following publications form a part of this specification to the
8、 extent specified herein. Unless otherwise indicated, the latest issue of SAE publications shall apply. 2.1.1SAE PUBLICATIONSAvailable from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001. SAE J844Nonmetallic Air Brake Tubing SAE J2024Contaminants for Testing Air Brake Components and Auxiliar
9、y Pneumatic Devices 2.1.2ASTM PUBLICATIONAvailable from ASTM, 100 Barr Harbor, West Conshohocken, PA 19428-2959. ASTM B 117Salt Spray (Fog) Testing ASTM D 4329Standard Practice for Fluorescent UV exposure of Plastics ASTM G 53Practice for Operating Light- and Water-Exposure Apparatus (Fluorescent UV
10、- Condensation Type) for Exposure on Nonmetallic Materials ASTM G 151Standard Practice for Exposing Nonmetallic Materials in Accelerated Test Devices that Use Laboratory Light Sources ASTM G 154Practice for Operating Fluorescent Light Apparatus for UV Exposure of Nonmetallic Materials SAE J2494-3 Is
11、sued JUL2002 -2- 2.2Related PublicationsThe following publications are provided for information purposes only and are not a required part of this specification. 2.2.1SAE PUBLICATIONAvailable from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001. SAE HS J806SAE Oil Filter Procedure 2.2.2FEDERAL
12、 PUBLICATIONAvailable from the Superintendent of Documents, U. S. Government Printing Office, Mail Stop: SSOP, Washington, DC 20402-9320. DOT FMVSS 571.106 (49CFR 571.106) Brake Hoses 3.Requirements for Metallic and Non-metallic Fittings 3.1Tensile Tests 3.1.1DESCRIPTIONBoth hot and cold tensile tes
13、ts shall be conducted with different unaged assemblies (fittings attached within 30 days of test date). Tests consist of subjecting the assembly to increasing tensile load in a suitable testing machine until the specified force value or elongation percentage has been obtained. 3.1.2APPARATUSA tensil
14、e testing machine with suitable indicating device shall be used for the tensile test. The fixtures for holding the test specimens shall be arranged so the tubing and fittings have a straight centerline corresponding to the direction of the machine pull. The lower part of the fixture shall be equippe
15、d with a container of sufficient dimensions to submerge the required length of tubing in water. A means of heating the water to boiling shall be provided. 3.1.3TEST SAMPLESThe tubing sample shall be obtained from current production stock and cut to a length sufficient to obtain 150 mm 6 mm of tubing
16、 between end fittings after assembly. Assemble fittings to the tubing using the manufacturers recommendations. 3.1.4PROCEDURE 3.1.4.1High Temperature Tensile Test (5 samples)Place the test specimen in the tensile machine with the lower fitting and 102 mm (+6/0 mm) of tubing submerged below the surfa
17、ce of the boiling distilled water such that the outside diameter is exposed to the water. Continue boiling for 5 min (+5/0 min.) Apply load at a rate of pull of 25 mm/min. The test specimen shall elongate 50%, that is 150 mm increased to 225 mm, or shall withstand the load listed in Table 1 without
18、causing separation from the fitting. 3.1.4.2Conditioned Tensile Test (5 samples)Condition test specimen at 40 C for 30 min (+0.5/0 min), normalize at room temperature then submerge in boiling water for 15 min. Repeat for a total of four complete cycles. Allow the test specimen to normalize at room t
19、emperature for 30 min. Conduct the tensile test within 30 min after the normalizing period while at ambient temperature of 24 C. Apply load at a rate of 25 mm/min. The test specimen shall elongate 50%, that is 150 mm increased to 225 mm, or shall withstand the load listed in Table 1 without causing
20、separation from the fitting. 3.1.4.3Water Absorption and Tensile Test (5 samples)After immersion in distilled water at 24 C for 70 h, conduct tensile test on the specimen by applying a load at the rate of 25 mm/min. The tube assembly shall withstand without separation of the tube and end fittings a
21、tensile pull as listed in Table 1. 3.1.4.4Acceptance Criteria SAE J2494-3 Issued JUL2002 -3- 3.2Air Leakage (5 Samples) 3.2.1DESCRIPTIONThis test is designed to evaluate the effects of high and low system pressures on the fitting assembly at high and low temperatures. 3.2.2APPARATUSThe equipment mus
22、t be capable of controlling the ambient air temperature between 40 C and 104 C while applying 1035 kPa or 70 kPa dry air to the test lines. A mass flow meter capable of determining air leakage shall be provided. 3.2.3TEST SAMPLESCut tubing sample to a length sufficient to obtain 460 mm between fitti
23、ngs after assembly. Assemble identical fittings to the tubing using the manufacturers recommendation. 3.2.4PROCEDUREPlace both ends of the test samples in temperature cycling cabinet and connect to a pressure source capable of 70 kPa 7 kPa and 1035 kPa 70 kPa pneumatic pressure. Pressure 4 c/h, alte
24、rnating between 70 kPa 7 kPa and 1035 kPa 70 kPa. Subject the test samples while under pressure to 24 C for 2 h, 104 C for 12 h, 24 C for 2 h, 40 C for 2 h, and 24 C again for 2 h in the order listed. See Table 2 and Figure 1. TABLE 1TENSILE REQUIREMENTS Nominal Tubing OD (in)Tensile Load (Newtons)
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