《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》由会员分享，可在线阅读，更多相关《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（11页珍藏版）》请在三一文库上搜索。
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)
25、5/32225 3/16225 1/4225 5/16335 3/8670 1/2900 5/81450 3/41560 TABLE 2AIR LEAKAGE TEST CONDITIONS Time (hours)Pressure (kPa)Temperture (C) 2103524 141035104 16103524 18103540 20103524 SAE J2494-3 Issued JUL2002 -4- FIGURE 1AIR LEAKAGE TEST CYCLE CHART 3.2.5ACCEPTANCE CRITERIAAfter the pressure in the
26、assembly is allowed to stabilize, the test specimen is considered a failure if the average leakage per fitting on any assembly at specified test conditions in Table 2 exceeds the amounts listed in Table 3. 3.3Vibration Test (5 samples) 3.3.1DESCRIPTIONThis test is designed to evaluate the effects of
27、 vibration on a tube and fitting assembly under varying internal pressures and ambient temperatures. Leakage rate is used to gauge acceptability. 3.3.2APPARATUSEquipment capable of vibrating one end of the test specimen at 600 c/min through 12 mm displacement in a plane perpendicular to the tube whi
28、le the other end is held rigid. The distance between the static and vibrating head is to be such, that when the assembly is displaced 12 mm, no parallel pull to the longitudinal axis of the assembly will occur. The equipment must be capable of automatically adjusting the system pressure to compensat
29、e for fluctuating temperatures between 40 C and 104 C and associated air pressure of 830 kPa dry air during the test process. A mass flow meter capable of determining air leakage shall be provided. 3.3.3TEST SAMPLESAllowing 12.7 mm slack, cut tubing sample to a length sufficient to obtain 460 mm bet
30、ween fittings after assembly. Assemble identical fittings to the tubing using the manufacturers recommendation. 3.3.4PROCEDUREAllowing 12 mm slack, mount the lines straight in the vibrating machine. Oscillate one end of the lines at 600 cycles/minute (20 cpm) through a total stroke of 12 mm for a to
31、tal of 1000000 cycles (+ 50 000/0 cycles), while maintaining test conditions as shown in Table 4. Starting at 104 C, vary the ambient air temperature from 104 C to 40 C at 250000 vibration cycle intervals. Using a mass flow meter, observe for fitting leakage during and after the test. TABLE 3LEAKAGE
32、 TEST REQUIREMENTS Test Temperature (C) Maximum Leakage (Standard Cubic Centimeters/minute) 1043 245 407 SAE J2494-3 Issued JUL2002 -5- 3.3.5ACCEPTANCE CRITERIAThe test is considered a failure if the average leakage per fitting on any assembly at test temperatures exceeds the amounts listed in Table
33、 3. 3.4Fitting Separation Pressure Test Requirements (5 samples) 3.4.1DESCRIPTIONThis test is intended to evaluate fitting retention at proof pressure of 2760 kPa 70 kPa and at minimum separation pressure. 3.4.2APPARATUSThe test apparatus consists of a suitable source of hydraulic pressure and the n
34、ecessary gauges and piping. 3.4.3TEST SAMPLESCut tubing sample to obtain 300 mm between fittings after assembly. Assemble fittings to the tubing using the manufacturers recommendations. 3.4.4PROCEDUREPlug one end of the test specimen and mount in the apparatus with the end unrestrained. Apply proof
35、pressure at room temperature, 24 C to the test specimen and hold for 30 s. Increase pressure at a constant rate so as to reach the specified minimum separation pressure within a time period of 3 to 15 s. 3.4.5ACCEPTANCE CRITERIAFittings shall not separate from the tubing nor shall the assembly visib
36、ly leak at less than specified minimum separation pressure of 5500 kPa 70 kPa. 3.5Frozen Water Retention Test (5 Samples) 3.5.1DESCRIPTIONThis test is intended to evaluate the effects of frozen water on fitting retention while assembly is pressurized to 2760 kPa 70 kPa. 3.5.2APPARATUSThe test appara
37、tus consists of a suitable source of pneumatic pressure and the necessary gauges and piping. 3.5.3TEST SAMPLESThe tubing sample shall be obtained from current production stock and cut to a length sufficient to obtain 150 mm 6 mm of tubing between end fittings after assembly. Assemble fittings to the
38、 tubing using the manufacturers recommendations. 3.5.4PROCEDURESubmerge one end of fitting assembly in water for 15 s, then remove the specimen from the water making sure the orientation of the fitting is such that no water is allowed to drain. Place test specimen in 10 C air for a minimum of 1 h or
39、 until completely frozen. Conduct pressure test on the specimen while at 10 C by applying 2760 kPa 70 kPa pneumatic pressure and hold for 5 min. 3.5.5ACCEPTANCE CRITERIAFittings shall not separate from the tubing at the specified minimum test pressure of 2760 kPa. TABLE 4VIBRATION TEST REQUIREMENTS
40、Test CyclesTest Pressure (kPa)Test Temperature (C) 0/250 0000104 250 001/500 000040 500 001/750 000827104 750 001/1 000 00082740 SAE J2494-3 Issued JUL2002 -6- 3.6Reassembly Test (5 samples) 3.6.1DESCRIPTIONThis test is intended to evaluate the effects of repeated assembly and disassembly of a tube
41、and fitting. Leakage rate is used to gauge acceptability. 3.6.2APPARATUSThe test apparatus consists of a suitable source of pneumatic pressure and the necessary gauges and piping. A mass flow meter capable of determining air leakage shall be provided. 3.6.3TEST SAMPLESCut tubing sample to obtain 305
42、 mm between fittings after assembly. Assemble fittings to the tubing using manufacturers recommendations. 3.6.4PROCEDUREThe tube and fitting connections shall be assembled, pressurized to 830 kPa 70 kPa pneumatic for 5 min, depressurized and disassembled five times. Tube end must not be trimmed betw
43、een each assembly and disassembly cycle. Reassemble a sixth time and pressurize the test specimen to 830kPa 70 kPa with pneumatic pressure at room temperature of 24 C, hold for 5 min and check for leakage. 3.6.5ACCEPTANCE CRITERIAThe test is considered a failure if the average leakage per fitting on
44、 any assembly at test temperatures exceeds the amounts listed in Table 3. 3.7Oil Compatibility Test (5 samples) 3.7.1DESCRIPTIONThis test is intended to evaluate the effects of contaminated compressor oil as described in SAE J2024 Section 3 at high and low temperatures on fitting performance. 3.7.2A
45、PPARATUSThe test apparatus consists of a suitable source of hydraulic pressure, 1035 kPa, and necessary gauges and piping in environmental test chambers at 100C and 40C. 3.7.3TEST SAMPLESCut tubing sample to obtain a minimum of 300 mm between fittings after assembly. Assemble fittings to the tubing
46、using manufacturers recommendations. 3.7.4PROCEDUREFill test specimens with contaminated oil mixture consisting of 11 parts SAE 15W40CD type oil and 1 part SOFTC-2A contaminate. Subject specimens to 100 C, and atmospheric pressure for 72 h, then apply internal pressure of 1035 kPa 70 kPa for 5 min w
47、hile maintaining temperature of 100 C. Reduce to atmospheric pressure and permit test specimens to return to room temperature (24 C); then subject test specimens to 40 C and atmospheric pressure for 24 h. Then apply internal pressure of 1035 kPa 70kPa for 5 min while maintaining a temperature of 40
48、C. 3.7.5ACCEPTANCE CRITERIATubing shall not rupture or disconnect from the fittings. 3.8Fitting Assembly Corrosion Resistance Test (5 samples) 3.8.1DESCRIPTIONThis test is designed to test the effects of salt spray corrosion on fitting assembly performance. 3.8.2APPARATUSUtilize the apparatus descri
49、bed in ASTM B 117 Salt Spray (Fog) Testing. Mix a salt solution five parts by weight of sodium chloride to 95 parts of distilled water, using sodium chloride substantially free of nickel and copper, and containing on a dry basis not more than 0.1% of sodium iodide and not more than 0.3 percent of total impurities. Ensure that the solution is free of suspended solids before the solution is atomized. After atomization at 35 C, ensure that the