Proposal to amend UN R134 regarding hydrogen and fuel cell vehicles. The amendment clarifies requirements for supply lines serving additional thermally activated pressure relief devices (TPRDs) on compressed hydrogen storage systems. It specifies that supply lines must be constructed from metallic materials, demonstrate mechanical integrity through qualification tests excluding drop tests, and establishes handling procedures to prevent damage. The proposal also defines container attachments and refines test procedures for burst pressure, drop impact, permeation, and localized leak testing.

Request for authorization to develop test procedures to assess the mechanical integrity and durability of supply lines to any additional Thermally activated Pressure Relief Devices (TPRD) connected directly to the Compressed Hydrogen Storage System (CHSS).