The expert group on UN R55 submitted document GRRF/2014/14 to update the requirements for mechanical couplings, including a proposal to replace the references to IS0 7641:1983 with ISO 7641:2012. In response to issues raised within GRRF, the experts prepared a new proposal (document GRRF/2014/28). This document would supplement the proposal by providing additional information on the differences between the 1983 and 2012 versions of ISO 7641.

Observations on type-approval and “in-use” requirements under UN R55 and proposal to develop a new Annex that would provide a more coherent approach to evaluating/limiting acceptable in-use stress loads than in the current regulation.

Status of the various items under discussion for the updating of UN R55 on mechanical couplings.