Proposal to enable GRSG approval of documents GRSG/2022/23, GRSG/2022/24 and 2022/25 as a new series of amendments to facilitate traceability.

Proposal e to introduce a missing transitional provision to 04 series to cover the acceptance of type approvals according to the preceding series when not affected by the provisions of the new series.

Proposal defines the working pressure for an LNG tank to be the primary relief valve setting (paragraph 4.4.), without stating a minimum value of the said relief valve. If a vehicle has an on-board tank with a primary relief valve that opens at a lower pressure than that at which the filling station is set to stop, the primary relief valve will open during refueling and this is an obvious safety risk.

Proposes the addition of design qualification tests also will harmonize with ISO 15500-13:2012, and the North American CSA/ANSI PRD 1 (2020).

Update paragraphs to be in line with the requirements of ISO15500 and NGV3.1 (industry standards for CNG).