Standard

SAE AS4841D

Publisert
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Omfang

Hydraulic and fluid Tube fittings covered within this standard are intended for use in all types of fluids and are considered a replacement for MIL-F-5509. These parts are used in various applications through the aerospace industry and the DoD. Supplemental Information The previous listed capabilities for flared fittings are for reliable fitting joints based upon operational experience using AS, AN, MS, and fittings, nuts, sleeves, and flares. By using nonstandard design joints (thicker walled nuts or fittings, special seals, etc.), burst pressures of 20000 to 25000 psi have been obtained with correspondingly higher operating pressures and proof pressures and qualified with impulse test. These nonstandard fittings may be used at more severe conditions (load, vibration, corrosion, etc.) than specified in this document, but the design and supporting test data are the designer’s responsibility and are subject to approval by the procuring activity. In addition, the Barlow formulae as defined in ASTM A370 may be used to determine the wall thickness using the yield strength of the metal with some safety factor and then tested with higher proof pressures, burst pressures, and impulse test. Superseding Information This document is intended to be an improved suitable designation as a procurement specification for flared tube fittings incorporating internal nominal 37 degree conical sealing surfaces. This document is also an improvement as a primary procurement specification for the following known fittings and other associated part standard fittings that use MIL-F-5509, as follows: Lessons Learned, Aluminum Fittings and Their Use on Commercial Jet Aircraft The use of aluminum sleeves in conjunction with aluminum fittings for sizes -10 and -12 on 3000 psi systems resulted in unacceptable performance levels on commercial aircrafts. Replacing aluminum sleeves with CRES sleeves improved performance levels. As a result, manufacturers of commercial aircrafts discontinued the use of the aluminum sleeve/fitting combinations as well as aluminum fittings having the flared feature as part of the fitting, for 3000 psi systems entirely. The use of any aluminum fittings on 3000 psi systems is not recommended for new design but remain supported for legacy systems, at user’s discretion.

Dokumentinformasjon

  • Standard fra SAE_AC
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  • Varetype: IS