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Performance Requirements for SAE J844 Nonmetallic Air Brake Tubing and Push to Connect Fitting Assemblies Used in Vehicular Air Brake Systems
- Ground Vehicle Standard
Published February 21, 2019 by SAE International in United States
Downloadable datasets availableAnnotation ability available
This 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 applicable 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, refer to SAE J844.
The purpose of this specification revision is to modify the language/description of the oil used in the 3.7, which, as described in 3.7.1, “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.” The contaminated oil mixture is currently specified in 3.7.4, as “consisting of 11 parts SAE 15W40CD type oil and one part SOFTC-2A contaminates.” Since API oil service requirements are constantly being reviewed and updated, as pointed out by others on the committee, it is inevitable that older grades, such as the SAE 15W40CD grade originally listed, will eventually become obsolete and/or unavailable. The recommended revision to the document is to change the oil description in 3.7.4 from “SAE 15W40CD” to “SAE 15W40 (current API Diesel C Service Category for four-stroke diesel engines, such as API CK4 current as of 2018),” so that most current and applicable oil grades that become standardized for service will be used for the oil mixture, keeping the test relevant for future vehicles. Note that the phrase “such as API CK4 current as of 2018” is added to further clarify what is the current (as of this revision) API service category, addressing an SAE first ballot comment.
|Ground Vehicle Standard||Dimensional Specifications for Non-Metallic Body Push-to-Connect Fittings Used On a Vehicular Air Brake System|
|Ground Vehicle Standard||Performance Requirements for SAE J844 Nonmetallic Tubing and Fitting Assemblies Used in Automotive Air Brake Systems|
|Ground Vehicle Standard||Nonmetallic Air Brake System Tubing|
Data Sets - Support Documents
|Unnamed Dataset 1|
|Unnamed Dataset 2|
|Table 1||Tensile requirements|
|Table 2||Air leakage test conditions|
|Table 3||Leakage test requirements|
|Table 4||Vibration test requirements|
|Table 5||Side load test requirements|
Air Brake Tubing and Tube Ftg Committee
The Air Brake Tubing and Tube Fittings Committee develops and maintains SAE Standards, Recommended Practices and Information Reports relating to tubing and fittings of air brake systems. Participants in the Air Brake Tubing and Tube Fittings Committee of the Truck and Bus Brake and Advanced Driver Assistance Systems Steering Committee includes OEMs, suppliers, consulting firms, government and other interested parties.
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