Text prepared by the Netherlands and the International Association for Natural Gas Vehicles (IANGV/NGV Global) to clarify the provisions of Chapter 18 following the introduction of automatic valves (see report GRSG/84, para. 38).

Proposal to clarify the provisions for the periodic inspection of pressure relief valves.

Proposal to regulate the direction of discharging the pressure relief devices of CNG containers.

Proposal to establish an expert working group to review and update the provisions of UN Regulation No. 110 in order to produce a new consolidated, harmonized version of the regulation.

Pursuant to research conducted in Japan, this document recommends amending UN R110 with regard to:

1. Welded metal cylinders
2. Steel cylinders (CNG-1 cylinder) and Steel liner cylinders (CNG-2 cylinder)
3. Accessories fitted to the cylinder, and
4. Indication of cylinder and accessories fitted to the cylinder.

The document also raises the possibility of further considerations concerning LNG cylinders.

Proposal to add a definition for “CNG Accumulator” and to revise a related decision tree flow chart.

Corrections to the proposal to clarify the provisions of Chapter 18 following the introduction of automatic valves (see report GRSG/84, para. 38).

Request to postpone consideration of the Dutch proposal concerning the discharge of natural gases from a pressure relief device (PRD) in anticipation of conclusions and best practices on the location and venting of PRD from a research program underway in the US.

Proposal to introduce a new class of CNG components (Class 6) operating at a higher pressure.

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ISO Standard 11439 concerns “High pressure cylinders for the on-board storage of natural gas as a fuel for automotive vehicles”. ISO 6722 concerns ’60 V and 600 V single-core cables — Part 1: Dimensions, test methods and requirements for copper conductor cables".

Proposal to add a definition for “CNG Accumulator” and to revise a related decision tree flow chart.

Proposal to clarify the provisions for the periodic inspection of pressure relief valves.

Proposal to establish an expert working group to review and update the provisions of UN Regulation No. 110 in order to produce a new consolidated, harmonized version of the regulation.