are normally designed for working pressures up to 17.5 kg/cm2 which
corresponds to the vapour pressure of propane at 45 °C, the maximum
ambient temperature the vessel is likely to operate in. The tanks can be
constructed from ordinary grades of steel, are mounted in cradle-shaped
foundations, and if below deck are fitted with domes protruding through
the deck to which are fitted all connections. Wash bulkheads are fitted in