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.

33. The expert from Belgium presented GRSG-106-15 reflecting the current provisions of UN Regulation No. 110 on the periodic requalification of CNG gas cylinders (Annex 3A) and LNG tanks (Annex 3B). She questioned the differences in the periodicity for the inspection of such cylinders and tanks. Following the discussion, GRSG underlined the need to investigate this subject and agreed to keep GRSG-106-15 on the agenda.

40. The expert from Belgium withdrew ECE/TRANS/WP.29/GRSG/2014/28. Recalling the discussion at the previous session of GRSG, the expert from the Netherlands presented ECE/TRANS/WP.29/GRSG/2015/5 (superseding ECE/TRANS/WP.29/GRSG/2014/30) clarifying the provisions of Chapter 18 of the Regulation following the introduction of provisions for the mandatory installation of manual and automatic valves. GRSG noted a number of comments. Following the discussion, GRSG adopted ECE/TRANS/WP.29/GRSG/2015/5, as amended below, and requested the secretariat to submit the adopted proposal to WP.29 and AC.1 for consideration at their November 2015 sessions, as draft Supplement 4 to the 01 series of amendments to UN Regulation No. 110.

Paragraph 18.3.4.8., amend “LNG valve (automatic)” to read “Automatic valve”.