Standards Development

Scope

This standard specifies the methods for testing and evaluating the performance of self-sealing flat-face couplings used in the fields of aerospace and data centers under pressures ranging from 0 to 300 psi, including test conditions, test equipment, test procedures and assessment of test results. Although this standard is mainly intended for such applications, if necessary, similar application scenarios in other fields, such as self-sealing flat-face couplings used in air circuit systems, fuel systems and water systems whose working pressures can be covered, can refer to and implement it accordingly.

Purpose

With the development of aerospace equipment and data centers, liquid cooling heat dissipation technology has been widely applied. Consequently, higher requirements have been put forward for self-sealing flat-face couplings used for fluid connections between equipment in liquid cooling systems. Given that all the existing international standards regarding self-sealing flat-face couplings are for medium and high-pressure applications at present. Medium and high-pressure flat-face couplings are mainly used in the field of hydraulic transmission, and their application scenarios include agricultural and forestry machinery and equipment, the chemical industry, as well as connections between hydraulic power units and tools in hydraulic transmission, etc. There are problems such as poor sealing effect and relatively high leakage rate under low-pressure working conditions. Since they are not originally designed for low-pressure working conditions, the issues of poor sealing effect and high leakage rate under low pressure have not drawn much attention.

However, in the liquid cooling systems of aerospace vehicles and data centers, the actual operating pressure is usually within 100 psi, and any leakage is unacceptable because any possible leakage may lead to the burnout of electronic devices. Therefore,self-sealing flat-face couplings used under pressures ranging from 0 to 300 psi need to be specifically assessed and evaluated under lowpressure working conditions, and it is not suitable to directly adopt the test methods for medium and high-pressure self-sealing flat-face couplings for experimental assessment. It is very necessary to formulate a unified standard for adaptive testing of self-sealing flat-face couplings used in low-pressure working conditions such as liquid cooling systems.

 The International Organization for Standardization (ISO) currently has no standards on this topic. All the existing standards related to self-sealing flat-face couplings are medium and high-pressure standards, and their main application environment is in the field of hydraulic transmission. The application scenarios include agricultural and forestry machinery and equipment, the chemical industry, and the connections between hydraulic power units and tools in hydraulic transmission.There are only two medium and high-pressure standards related to flat-face quick-release couplings in the field of hydraulic transmission, namely "ISO 18869:2017 Hydraulic fluid power - Test methods for quick-action couplings, with or without tools for disconnection" and "ISO 7241-2:2000 Hydraulic fluid power - Quickaction couplings - Test methods". These are the medium and high-pressure flat-face couplings standards for the liquid-cooled transmission field, lacking more reasonable test methods for evaluating low-pressure self-sealing flat-face couplings.There is an urgent need to formulate this standard to accurately and objectively assess and evaluate low-pressure self-sealing flat-face couplings, so as to facilitate the improvement of the standardization of the tests for low-pressure self-sealing flat-face couplings.

Manufacturers are in urgent need of this standard to provide normative guidance for product design, manufacturing and inspection, to provide highly reliable self-sealing flat-face couplings for users in fields such as aerospace and data centers, and to generate more economic benefits for society.