15.20mm tank wall cracking support ring elded or explosibonded Alternative tank support arrangements Insulation Tanks are in the form of pressure vessels,cylindrical or spherical. Maximum pressure is about 18 bar and no reliquification plant is provided. A compressor is Tanks are classed as self supporting,because of the loss of space the system is not popular and is usually applied to smaller ships Semi-pressurised,partly refrigerated pressure is 8 bar and r m ter Semi-pressurised,fully refrigerated to-45C. Tanks well insulated and eratures. t it is possi to carry a range to cargoes Alternative tank support arrangements Tanks are in the form of pressure vessels, cylindrical or spherical. Maximum pressure is about 18 bar and no reliquification plant is provided. Apart from certain areas around the supports insulation is not usually fitted. Relief v/v's are required to safe guard against pressure build up due to boil off. A compressor is provided to keep the tank system pressurised. Tanks are classed as self supporting, because of the loss of space the system is not popular and is usually applied to smaller ships Semi-pressurised, partly refrigerated These reduce the cost and weight; tanks are insulated and reliquifaction plant is fitted, max pressure is 8 bar and minimum tempo about -5oC. Tank arrangement is similar to the fully pressurised and so there is still the loss of space. Semi-pressurised, fully refrigerated Pressure about 8 bar, and temperatures down to -45oC. Tanks well insulated and reliquification plant essential. Tank pressurised but it is possible to carry a range to cargoes at different pressures and temperatures. 3