ISO 22431:2018

Aerospace series - Pipe coupling 8°30' - Dynamic beam seal end for ferrule, welded - Geometric configuration

ISO 22431:2018 specifies the dimensions of the dynamic beam seal end for welded ferrules for pipe couplings 8°30′, nominal pressure up to 28 000 kPa, for aerospace applications.

Série aérospatiale - Système de raccordement 8°30' - Extrémité de joint à lèvre pour olive soudée - Configuration géométrique

General Information

• Status: Published
• Publication Date: 13-Mar-2018
• ICS: 49.080 - Aerospace fluid systems and components
• Technical Committee: ISO/TC 20/SC 10 - Aerospace fluid systems and components
• Drafting Committee: ISO/TC 20/SC 10/WG 6 - Couplings for rigid pipe
• Current Stage: 9093 - International Standard confirmed
• Start Date: 13-Nov-2023
• Completion Date: 13-Dec-2025

Relations

• Parent: ISO 8905:1988 - Sawn timber - Test methods - Determination of ultimate strength in shearing parallel to grain
• Effective Date: 06-Jun-2022

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.

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 22431
First edition
2018-03
Aerospace series — Pipe coupling
8°30′ — Dynamic beam seal end
for ferrule, welded — Geometric
configuration
Série aérospatiale - Système de raccordement 8°30' - Extrémité de
joint à lèvre pour olive soudée - Configuration géométrique
Reference number
©
ISO 2018
© ISO 2018
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ii © ISO 2018 – All rights reserved

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Required characteristics . 1
4.1 Configuration — Dimensions . 1
4.2 Surface roughness . 1
5 Designation . 4
Foreword
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