522. Conformity assessment for simple pressure vessels.

A category A vessel1 which is in conformity with a harmonised standard2 (or part of such a standard) the reference to which has been published in the Official Journal of the European Union, is presumed to be in conformity with the essential safety requirements3 covered by that standard (or that part of that standard)4. The presumption is rebuttable5. Prior to the manufacture of a category A vessel, an EU-type examination (Module B)6 must be carried out in respect of the technical design of the vessel7. Where a vessel is to be manufactured in accordance with a harmonised standard (or