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Fittings, Tube, Fluid Systems, Separable, Beam Seal, 3000/4000 psi, General Specification For
- Aerospace Standard
- AS85421B
- Revised
Downloadable datasets available
Annotation ability available
Sector:
Issuing Committee:
Language:
English
Scope
This specification covers the design requirements and test procedures for separable beam seal fittings which includes end fittings (see 2.3.4), fitting bodies (see 2.3.7), and boss fittings (see 2.3.2) for use in aerospace fluid systems. Design requirements are for class 3000 in corrosion resistant steel (15-5 PH, 17-4 PH CRES) only and for class 4000 in titanium alloy (Ti) and corrosion and heat-resistant steel (Nickel Alloy 718 CRES) only. Definition of fittings and related terms are defined in 2.3.
Rationale
This specification is revised to: (1) incorporate allowances for shape fittings to be manufactured from either: near-net forgings or bar-stock/oversized forgings per dimensions specified in AS1376. (2) Include qualification specifics for Nickel Alloy 718 fittings. (3) Include water as a test fluid for the Type IV System high-temperature burst pressure testing. (4) Replace the lot-to-lot destructive testing with periodic testing. (5) Incorporate an Appendix A, which is a Periodic Control Test Summary reporting format. (6) Align minimum “rate-of-rise” for Impulse Testing with AS603 so it is no longer an exception. (7) Include expanded bending-stress tables with additional higher pressure data-point references at lower cycles.
Recommended Content
Topic
Data Sets - Support Documents
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| Table 1 | Fitting and tubing materials | |
| Table 2A | 3000 psi CRES tubing sizes and bending stresses (AMS5643, AMS5659, AMS5656) | |
| Table 2B | 4000 psi Nickel Alloy tubing sizes and bending stresses (AMS5663) | |
| Table 2C | 4000 psi Titanium tubing sizes and bending stresses (AMS4928, AMS4965) | |
| Table 3 | Torque requirements | |
| Table 4 | Fitting assemblies | |
| Table 5 | Qualification inspection requirements |
Issuing Committee
G-3, Aerospace Couplings, Fittings, Hose, Tubing Assemblies
This Committee is responsible for developing and maintaining standards for design, test, and procurement of fluid systems part standards to improve reliability and economy. Their primary focus is on AS standards development and support of military standards. The Committee also develops ISO standards in a Subcommittee Advisory Group (SCAG) to ISO/TC 20/SC 10, and SAE-MA derivatives thereof.
Structure: SAE G-3 -- Parent committee SAE G-3A -- Aerospace Couplings Subcommittee SAE G-3B -- Aerospace Fittings Subcommittee SAE G-3D -- Aerospace Hose Subcommittee SAE G-3E - Aerospace Tubing Assemblies Subcommittee U.S. SCAG to ISO/TC 20/SC 10 -- ISO standards Major projects: Support of Military Standards Reform Support of military standard conversions to MIL-PERF and MIL-DTL. Development of AS replacements for military standards designated for conversion. Establish document to list G-3 accepted replacements for replaced part standards and military back-up specifications. Development of PRI QML/QPL Development of Performance Review Institute (PRI) process for approval and surveillance of manufacturers (Qualified Manufacturer List, QML) and for approval of standard parts as qualified for use (Qualified Parts List, QPL). Development of ISO Standards, Imperial Units ISO/TC 20/SC 10 standards have typically been developed in SI units. The ISO has approved development of inch-based ISO standards to support commercial aviation. Basic design, test, and procurement specifications will be selected from military standards that are to be converted to Non-Government standard (NGS) and developed as ISO standards.Reference
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