This European Standard specifies the requirements for the operation of a cylinder filling plant to ensure that filling of transportable refillable LPG cylinders is carried out in a controlled and safe manner. This document is applicable to the filling of cylinders complying with RID/ADR [10][11] (including pi marked cylinders) and also to existing non RID/ADR cylinder populations. This document is applicable to the following: - welded and brazed steel LPG cylinders with a specified minimum wall thickness (see EN 1442 [1] and EN 12807 [2] or an equivalent standard); - welded steel LPG cylinders without specified minimum wall thickness (see EN 14140 [4] or an equivalent standard); - welded aluminium LPG cylinders (see EN 13110 [3] or an equivalent standard); - composite LPG cylinders (see EN 14427 [5] or an equivalent standard); and - over-moulded cylinders (OMC). This document does not cover the requirements for filling LPG cylinders that are designed and equipped for filling by the user.