This draft 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 draft European Standard does not cover the requirements for filling LPG cylinders that are designed and equipped for filling by the user. This draft European Standard does not cover the requirements for filling LPG containers on vehicles. This draft European Standard is applicable to the following: welded and brazed steel LPG cylinders with a specified minimum wall thickness (see EN 1442 [2] and EN 12807 [3] 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 [5] or an equivalent standard); and composite LPG cylinders (see EN 14427 [6] or an equivalent standard). This draft European Standard is intended to be applied to the filling of cylinders complying with RID/ADR [7][8] (including pi marked cylinders) and also to existing non RID/ADR cylinder populations.