Overview
ISO 22431:2018 - Aerospace series - specifies the geometric configuration and dimensions of the dynamic beam seal end for welded ferrules used with pipe couplings 8°30′. It applies to aerospace pipe couplings designed for nominal pressures up to 28 000 kPa. The document provides dimensional data (millimetres), surface roughness guidance and a standard designation format for consistent manufacturing and procurement.
Key topics and requirements
- Scope: Dimensions and geometric configuration for dynamic beam seal ends on welded ferrules for 8°30′ pipe couplings in aerospace applications (≤ 28 000 kPa).
- Configuration and dimensions: Defined by a reference figure and a comprehensive Table 1 listing codes, nominal diameters and specific dimensional values for multiple sizes.
- Surface roughness: Requirements are given per the reference figure; design documentation can specify alternatives when needed.
- Manufacturer discretion: Dimensions not listed in the standard may be set by the manufacturer provided qualification and acceptance requirements of EN 3275, type II are met.
- Designation: Standardized part coding (example: ISO22431 0806) to ensure unambiguous identification across supply chains.
- Units and tolerances: Dimensions are in millimetres and specific tolerances for key features are provided in the tables/figures.
Practical applications and users
Who uses ISO 22431:
- Aerospace component designers and engineers specifying pipe couplings and ferrules for aircraft and spacecraft fluid systems.
- Manufacturers fabricating welded ferrules and pipe coupling components to ensure interchangeability and compliance.
- Quality, test and procurement teams verifying dimensional conformity, surface finish and acceptance criteria.
Practical uses:
- Standardizing mating interfaces for high-pressure aerospace pipe couplings (hydraulic, pneumatic or other fluid transfer systems within aircraft and space vehicles).
- Reducing design ambiguity and supplier mismatch by using a common geometric reference and designation.
Related standards
- EN 3275 - Dynamic beam seal - technical specification and qualification/acceptance (referenced for acceptance requirements).
- EN 2656 - Coupling ends, welded - geometric configuration (referenced for diameter relationships).
- Prepared under ISO/TC 20 (Aircraft and space vehicles), SC 10 (Aerospace fluid systems and components) and adopted from ASD-STAN work.
Keywords: ISO 22431, pipe coupling 8°30′, dynamic beam seal end, welded ferrule, geometric configuration, aerospace pipe coupling, 28 000 kPa, EN 3275, EN 2656.