Liquefied Gas Minicarrier Delivered By Moss Verft
Moss Verft, a member of the Norwegian Kvaerner Group, recently c o m p l e t e d the liquefied gas/ammonia carrier Hebe (shown above) for K / S A / S Helengas of Stavanger, Norway. The vessel will be operated by Rederiet Helge R. Myhre A/S, also of Stavanger. She is built to Det norske Veritas Classification + 1A1, Tanker for Liquefied Gas, Ice C, EO, as well as the U.S. Coast Guard's Rules and Regulations for Foreign Flag Vessels, and IMCO's Code f o r Gas Carriers, Resolution A 328.
With a cargo capacity of 2,600 cubic meters, Hebe has an overall length of 246 feet, beam of 46 feet, depth of 26 feet, and maximum draft of 22.3 feet. Her main engine is a 12-cylinder, turbocharged diesel, Nohab Polar type F212V825, which has a maximum continuous rating of 2,638 bhp at 825 rpm. It drives a controllablepitch propeller via a flexible coupling and a reduction gear. Auxiliary engines are four Volvo Penta diesels, each coupled to a Stamford generator with a rating of 215 kw.
Hebe is built with a single deck, transom stern, and bulbous bow. Accommodations and the engine room are located aft, while the reliquefaction plant is installed in the deckhouse amidship. Manufactured by Kvaerner Kulde A/S, the reliquefaction plant consists of twin unit, each comprising three compressors able to carry two cooled cargoes simultaneously. A combined inert gas/incinerator plant is installed in the engine room. The inert gas generator has a capacity of 500 cubic meters of nitrogen per hour. Both liquid and solid wastes can be burned in the incinerator. This combined plant was developed and built by Moss Verft. In function, the plant can supply inert gas to the cargo tanks, the hold spaces surrounding them, and all cargo-handling piping.
The ship has three cargo tanks in separate holds — one conical twin tank, one cylindrical twin tank, and one transverse cylindrical tank. Constructed of lowtemperature steel with an external insulation layer of polyurethane, the tanks are designed to carry cargoes with temperatures down to minus 48 C.
Cargo may be arranged in two separate systems, with three different tank combinations. The tanks are fitted with vertical, centrifugal deepwell pumps supplied by Thune-Eureka A/S. Two different cargoes can be carried simultaneously. Calculated loading/ discharging time is approximately 8 hours. Cargoes that can be carried include LPG as propane or butane, or mixtures of these; butadiene, vinyl chloride, propylene, propylene oxide, anhydrous ammonia, butylene, and isoprene.
Among the electronic gear are two Decca radars, Decca Navigator, echosounder, gyrocompass system, and a complete radio station supplied by STK. The ship will operate with a crew of 19.