ISO 24638:2021

Space systems — Pressure components and pressure system integration

This document establishes the baseline requirements for the design, fabrication and testing of space flight pressure components. It also establishes the requirements for the assembly, installation, test, inspection, operation and maintenance of the pressure systems in spacecraft and launch vehicles. These requirements, when implemented on a particular space system, ensure a high level of confidence in achieving safe and reliable operation. This document applies to all pressure components other than pressure vessels and pressurized structures in a pressure system. It covers lines, fittings, valves, bellows, hoses and other appropriate components that are integrated to form a pressure system. The requirements for pressure vessels and pressurized structures are set forth in ISO 14623. This document does not apply to engine components.

Systèmes spatiaux — Intégration des composants sous pression et des systèmes sous pression

General Information

• Status: Published
• Publication Date: 12-May-2021
• ICS: 49.140 - Space systems and operations
• Technical Committee: ISO/TC 20/SC 14 - Space systems and operations
• Drafting Committee: ISO/TC 20/SC 14 - Space systems and operations
• Current Stage: 6060 - International Standard published
• Start Date: 13-May-2021
• Due Date: 05-Apr-2021
• Completion Date: 13-May-2021

Relations

• Consolidated By: ISO 18134-3:2023 - Solid biofuels — Determination of moisture content — Part 3: Moisture in general analysis sample
• Effective Date: 06-Jun-2022
• Revises: ISO 24638:2008 - Space systems — Pressure components and pressure system integration
• Effective Date: 15-Jul-2017

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 24638
Second edition
2021-05
Space systems — Pressure
components and pressure system
integration
Systèmes spatiaux — Intégration des composants sous pression et des
systèmes sous pression
Reference number
©
ISO 2021
© ISO 2021
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
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ii © ISO 2021 – All rights reserved

Contents Page
Foreword .vi
Introduction .vii
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Abbreviated terms . 5
5 General requirements . 5
5.1 General . 5
5.2 Design requirements . 6
5.2.1 Loads, pressures and environments . 6
5.2.2 Strength . 6
5.2.3 Stiffness . 6
5.2.4 Thermal effects . 7
5.2.5 Stress analysis . 7
5.2.6 Fatigue analysis/damage tolerance (safe-life) analysis . 7
5.2.7 Analysis of survivability against space debris and meteoroid impacts . 7
5.2.8 Avoidance of accidental break-up caused by an on-board source of energy . 7
5.3 Material requirements. 8
5.3.1 Metallic materials . 8
5.3.2 Non-metallic material requirements . 8
5.4 Fabrication and process requirements . 8
5.5 Contamination control and cleanliness requirements . 9
5.5.1 General contamination control requirements . 9
5.5.2 Design considerations . 9
5.6 Quality assurance programme requirements .10
5.6.1 General.10
5.6.2 QA programme inspection plan requirements .10
5.6.3 QA inspection technique requirements .10
5.6.4 QA inspection data requirements .10
5.6.5 Acceptance test requirements .10
5.7 Qualification test requirements.11
5.8 Operation and maintenance requirements .11
5.8.1 Operating procedure .11
5.8.2 Safe operating limits .11
5.8.3 Inspection and maintenance .12
5.8.4 Repair and refurbishment .12
5.8.5 Storage .12
5.8.6 Documentation .12
5.8.7 Reactivation .13
5.8.8 Recertification .13
6 General pressurized-system requirements .13
6.1 System analysis requirements .13
6.1.1 System pressure analysis .13
6.1.2 System functional analysis .13
6.1.3 System hazard analysis.14
6.2 Design features .14
6.2.1 Assembly .14
6.2.2 Routing .14
6.2.3 Separation .14
6.2.4 Shielding.14
6.2.5 Grounding .15
6.2.6 Handling .15
6.2.7 Special tools .15
6.2.8 Test points .15
6.2.9 Common-plug test connectors .15
6.2.10 Individual test connectors .15
6.2.11 Threaded parts .15
6.2.12 Friction-type locking devices .15
6.2.13 Internally threaded bosses .15
6.2.14 Retainer or snap rings .15
6.2.15 Snubbers .15
6.3 Component selection .16
6.3.1 Connections .16
6.3.2 Fluid temperature .16
6.3.3 Actuator pressure rating .16
6.3.4 Pressure rating .16
6.3.5 Pump selection .16
6.3.6 Fracture and leakage .16
6.3.7 Oxygen system components.16
6.3.8 Pressure regulators .16
6.3.9 Manual valves and regulators .16
6.4 Design pressures .17
6.4.1 Overpressure or underpressure .17
6.4.2 Back-pressure .17
6.4.3 Pressure isolation .17
6.4.4 Gas/fluid separation .17
6.4.5 Compressed-gas bleeding .17
6.5 Me
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