This Part of this European Standard specifies requirements for the design of unfired pressure vessels covered byEN 13445-1:2009 and constructed of steels in accordance with EN 13445-2:2009.EN 13445-5:2009, Annex C specifies requirements for the design of access and inspection openings, closingmechanisms and special locking elements.NOTE This Part applies to design of vessels before putting into service. It may be used for in service calculation or analysissubject to appropriate adjustment.