The bottom of each tank slopes to a definite lower point while the top is slightly conical. Pipe work is connected to the lowest point to ensure that the tanks can be completely drained, while at the top of each tank is a radar tank level gauging system, nitrogen pipes and temperature sensors. The free-standing tanks have air space all around them. They stand on cylindrical pillars and near the top are braced sideways by girders which also form part of the walkway and ladder system. The boundaries of the holds are insulated using a panel system made up from polyurethane foam slab with a galvanised steel protective jacket on one side and a polished aluminium facing towards the hold. In three of the cargo holds the tanks are arranged with two either side of the centre line. The refrigerating system is supplied by York and uses ammonia in the primary circuit and brine in the secondary. Three electrically-driven refrigerant compressors are installed in the deckhouse. Brine from the evaporator room circulates through heat exchangers in each hold where large fans lead air to all parts of the insulated holds through strategically placed ductwork.
发表于 2008-6-13 07:21
提升卡
变色卡
楼主
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