22. GRSG considered ECE/TRANS/WP.29/GRSG/2014/27 on introducing a new class of compressed natural gas (CNG) components (Class 6). The proposal received a number of comments from GRSG. The expert from IANGV introduced GRSG-107-38 (superseding GRSG-107-03), for the follow-up discussion. Finally, GRSG adopted ECE/TRANS/WP.29/GRSG/2014/27 as amended by Annex III of the GRSG-107 session report. The secretariat was requested to submit the proposal to the March 2015 sessions of WP.29 and AC.1 as draft Supplement 3 to the 01 series of amendments to UN Regulation No. 110.

23. The expert from Belgium introduced ECE/TRANS/WP.29/GRSG/2014/28 clarifying the provisions for the periodic inspection of pressure relief valves. The expert from OICA suggested to improve the proposal by adding further instructions on how to conduct the tests. The expert from France raised similar comments and suggested to indicate the exact test that should be conducted either visually or physically. The expert from IANGV argued the lack of empirical evidence for the proposal and suggested a five-year frequency of visual inspection frequency. The expert from Germany stated that the proposal addressed issues beyond of the scope of the type approval procedures. Finally, GRSG agreed to resume discussion on this matter at its May 2015 session.

24. The expert from the Netherlands introduced ECE/TRANS/WP.29/GRSG/2014/29 to regulate the direction of discharging the pressure relief devices of CNG containers. He explained that the proposal addressed the safety of not only the vehicle occupants but also the surrounding area. The expert from IANGV introduced GRSG-107-35, which suggests that the discussion should be deferred until after the outcome of the ongoing research conducted in the United States of America on this matter. The experts from France, Germany, Sweden and OICA questioned the impact of this proposal on design of vehicle categories M1 and N1. GRSG agreed to resume discussion on this subject at its May 2015 session on the basis of a revised document.

25. The experts from the Netherlands and IANGV introduced ECE/TRANS/WP.29/GRSG/2014/30 and its amendment GRSG-107-36 amending it. The expert from France raised a study reservation on the proposal and GRSG agreed to resume discussion on this subject at its May 2015 session on the basis of a revised official proposal by the Netherlands.

26. Recalling its request at the previous session, GRSG noted the availability of ISO STD 11439:2013 and ISO 6722 (GRSG-107-28) with a condition of limited use by GRSG experts. The expert from NGV Global introduced the terms of references (ToR) for the proposed IWG to revise the provisions of the UN Regulation (GRSG-107-02), including the harmonization of provisions related to private standards. The expert from Germany suggested that the proposed ToR needed improvement and added that he did not support the establishment of an IWG that would revise the UN Regulation without a clear description of tasks. The expert from France made similar comments and raised concerns on the availability of ISO standards. The Chair of GRSG suggested the possible solution of reproducing the part concerned with ISO STD 11439:2013 into Annex 3 of the UN Regulation rather than to reference it. GRSG agreed to resume discussion at its May 2015 session on the basis of a revised proposal tabled by the expert from NGV Global. Interested experts were invited to contact the expert from NGV to complete the revised draft ToR.

27. The expert from Japan introduced GRSG-107-09 and GRSG-107-37, informing GRSG about the outcome of a “Study group for CNG cylinders” established in Japan for investigation of safety related issues in UN Regulation No. 110. The expert from EC encouraged discussion on this subject. GRSG agreed to resume discussion on this subject at its May 2015 session, awaiting further information provided by the expert from Japan.