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Encyclopedia of Marine and Energy Technology



According to Significant Ships of 1994

Built by McDermott’s Shipyards, USA, the sulphur tanker has four holds fitted with selfsupporting, insulated tanks, able to carry cargo at temperature between 127°C and 138°C and at specific gravity of 1.79. Each tank is 21.33m long, 20.72m wide and 9.14m deep and sits in its own hold on 14 pedestals. At the interface of each pedestal there is a special insulating pad supporting the tank, as well as insulating the hull from the heated cargo and allowing for expansion. Anti-roll and anti-pitch chocks prevent movement of the tanks in heavy seas or during a collision.

Each tank is fitted at its aft end with two deepwell pumps with a capacity of 500tons/h, although only one pump will be used at a time. The design allows the pumps to be removed and inserted while molten sulphur is in the tanks. All eight pumps lead to a common header on the main deck.

Heating of both cargo and engine room services is by thermal fluid equipment to avoid possible long-term heating coil failure inside the tanks if steam were to be used. To avoid contamination of engine room services with sulphur, two independent loops are used; The engine room primary one is heated by a waste heat economizer or auxiliary thermal fluid heater. This fluid is then passed through a heat exchanger to heat the secondary loop.

All cargo tanks are insulated by 100mm of glassfibre/expanded metal lath material, with 50mm on the thermal fluid lines. Each tank is additionally fitted with a de-humidified air bubbler and sweep air system to release any entrapped hydrogen sulphide in the cargo and to circulate the latter one.

Length, oa: 159.72m, Length, bp: 151.64m, Breadth, mld: 27.43m, Depth, mld to the main deck: 14.48m, Deadweight: 27,240dwt, Draught design/scantling: 10.06/11.28m, Service speed: 14 knots. Main engine Wärtsilä 8L46 output 9715bhp/500rev/min.

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