aid access. All manways with a cover weighing in excess of 25kg shall be provided with davits or hinges
based on the PEN Standard detail. All covers shall be fitted with two handles.
For 600# rated covers and above, davit design calculations are required. On completion, a functional
proof test shall be performed with an overload test of 2 times the rated safe working load. Davit
deflections shall be kept to a minimum.
Unless specified otherwise, manways on vessels operating at 1.0 barg and below may have the flange
and cover thickness designed for the design pressure in lieu of standard rating flanges.
The inner edges of all manholes and hand holes shall be ground to approximately 3mm radius.