This document specifies the procedures to be adopted when checking transportable refillable LPG cylinders before, during and after filling. This document applies to transportable refillable LPG cylinders of water capacity not exceeding 150 l and deemed to be fitted with valves designed according to EN ISO 14245 [4] and EN ISO 15995 [5]. This document does not cover the requirements for filling LPG cylinders that are designed and equipped for filling by the user. This document does not cover the requirements for filling LPG containers on vehicles. This document is applicable to the following: welded and brazed steel LPG cylinders with a specified minimum wall thickness (see EN 1442 and EN 12807 [1] or an equivalent standard); welded steel LPG cylinders without specified minimum wall thickness (see EN 14140 or an equivalent standard); welded aluminium LPG cylinders (see EN 13110 [2] or an equivalent standard); composite LPG cylinders (see EN 14427 or an equivalent standard); and over-moulded cylinders (OMC). Specific requirements for the different types of cylinders are detailed in Annex A, Annex B, Annex C, Annex D and Annex G. This document is intended to be applied to cylinders complying with RID/ADR [6] [7] (including pi marked cylinders) and also to existing non RID/ADR cylinder populations.