Revisions to Pressure Vessel Standards relevant for KGS Certification

4. January 2024

After the 148th meeting of the Gas Technical Standards Committee, revisions of 12 detailed standards were approved, including KGS AC111. This code defines that the KGS factory registration is required for pressure vessels in South Korea. The revisions have been implemented on November 11^th, 2023 and affect various sectors, encompassing high-pressure gases, liquefied petroleum gas (LPG), and hydrogen-related equipment.

Among the notable changes, the committee has specified the targets for the destructive and fatigue testing of hydrogen compressed gas facilities, introducing a clear definition, and adding a pressure test procedure. In the LPG sector, standards for the installation of inlet valves and measures for transverse pipe expansion and contraction have been aligned with city gas facility standards.

The scope of destructive and fatigue failure testing for hydrogen compressed gas facilities has been clarified by limiting it to specific openings. Additionally, gas (at 1.25 times the design pressure) has been introduced as a pressure test fluid for valves in toxic gas pipelines. Manufacturing standards were also clarified to allow the production of cylinder cabinets without piping.

For the manufacturing and filling of high-pressure gases, specific facilities and pressure regulators with a total weight of less than one ton (excluding gas weight) that pose no risk of ground subsidence were excluded from ground surveys. The standards were rationalized by acknowledging ASME standards for calculating the thickness of high-pressure gas and piping facilities.

In the case of LPG applications, standards for protecting pipes outside and passing through buildings, installing inlet valves, and measures to absorb expansion and contraction of transverse pipes have been aligned with city gas facility standards.

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