Essential Safety Requirements 1. The obligations arising from the essential requirements listed in this Annex for pressure equipment also apply to assemblies where the corre¬sponding hazard exists. 2. The essential requirements laid down in the Directive are compulsory. The obligations laid down in these essential requirements apply only if the corresponding hazard exists for the pressure equipment in question when it is used under conditions which are reasonably foreseeable by the manufacturer. 3. The manufacturer is under an obligation to analysis the hazards in order to identify those which apply to his equipment on account of pressure; he must then design and construct it taking account of his analysis. 4. The essential requirements are to be interpreted and applied in such a way as to take account of the state of the art and current practice at the time of design and manufacture as well as of technical and economic considerations which are consistent with a high degree of health and safety protection