Valves fitted on the outside of fuel oil, lubricating oil, cargo oil and hydraulic oil tanks where subjected to a static head of oil [see, for example, 4-6-4/13.5.3(a)]
Pipes, valves and fittings in cargo oil piping on weather decks for pressures exceeding 16 bar (16.3 kgf/cm2, 232 psi)
Pipes, valves and fittings in cargo oil manifolds for connection to cargo handling hoses
Fixed gas fire extinguishing systems