ISO 23748:2016/Amd 1:2021

Overview

ISO 23748:2016/Amd 1:2021 is an important amendment to the international aerospace standard focusing on the dimensions of O-ring grooves used in aerospace fluid systems and components. Issued by the International Organization for Standardization (ISO), this document provides crucial updates to the original ISO 23748:2016 standard, ensuring enhanced clarity and accuracy in aerospace sealing requirements.

This amendment revises key terminology and graphical representations related to O-ring groove dimensions to improve design consistency and operational reliability in aerospace applications. It was developed by ISO Technical Committee ISO/TC 20, Subcommittee SC 10, which specializes in aircraft and space vehicles including aerospace fluid systems.

Key Topics

• Updated Terminology
  The amendment replaces the terms "continuous pressure" with "operating pressure" and "pressure variation" with "pressure fluctuation" across multiple tables (Table 1, Table 8, Table 15, Table 22). These changes align the language with modern engineering practices and provide clearer guidance for system designers.

• Revised Figures
  Figure 4 within the standard has been replaced with a new graphical illustration to better represent the groove dimensions and improve comprehension for engineering and manufacturing teams.

• Focus on Dimensional Accuracy
  The amendment ensures that groove dimensions for O-rings adhere to the latest aerospace requirements, enhancing seal performance under varying pressure conditions.

• Scope in Aerospace Fluid Systems
  Although the original scopes are not detailed in the amendment, the standard primarily applies to aerospace fluid systems, ensuring proper seal functionality and safety in demanding environments like aircraft and spacecraft.

Applications

This amendment plays a critical role in industries where precision sealing and fluid system integrity are paramount. Key application areas include:

• Aerospace Engineering
  Designing and maintaining fluid systems in aircraft and spacecraft, where O-ring seals must withstand varying operating pressures and dynamic pressure fluctuations.

• Aerospace Component Manufacturing
  Guiding manufacturers on the precise dimensions of O-ring grooves to guarantee compatibility with sealing components, improving reliability and reducing risk of leakage.

• Maintenance and Inspection
  Providing updated terminology and requirements that aid engineers and technicians in assessing the condition and compliance of O-ring grooves during routine inspections or repairs.

• Safety and Compliance
  Enhancing adherence to international aerospace standards, facilitating certification processes and ensuring operational safety across global aerospace supply chains.

Related Standards

Professionals working with ISO 23748:2016/Amd 1:2021 may also find the following standards relevant:

• ISO 3601 Series – Dimensions and tolerances for O-rings themselves, complementing groove dimension specifications.
• ISO/TC 20 Series – Covers various aerospace components and fluid system standards designed to support system safety and performance.
• International Aerospace Quality Standards (AS9100) – Governing quality management systems that incorporate the use of ISO standards in aerospace manufacturing.

Conclusion

ISO 23748:2016/Amd 1:2021 ensures the aerospace industry maintains strict control over O-ring groove dimensions, enhancing sealing integrity under operational pressures. This amendment clarifies technical terms and updates design figures, providing practical value to aerospace engineers, manufacturers, and maintenance professionals. Adhering to these updated standards is essential for optimizing safety, reliability, and compliance in aerospace fluid systems.

Keywords: ISO 23748 amendment, aerospace O-ring groove dimensions, operating pressure, pressure fluctuation, aerospace fluid systems, sealing standards, O-ring groove design, aerospace sealing, ISO aerospace standards