This Technical Report provides a rationale and technical justification for certain European Standards for transportable gas cylinders, produced in accordance with the requirements of the Transportable Pressure Equipment Directive (TPED), to be used for applications currently listed in the Pressure Equipment Directive (PED). Its purpose is to prove equivalence of approach in the two directives and demonstrate equivalence to the overall level of safety in the Essential Safety Requirements (ESRs) of the PED, thereby allowing European Standards and EEC directives listed in this Technical Report to be used to fulfil the requirements of the PED, provided that their filling conditions fulfil the requirements of ADR/RID (P200, 4.1.4.1), in respect of portable fire extinguishers and breathing apparatus.