Combination Gas Tanker 'Hektor' Delivered By Moss Verft
The Moss, Norway, yard of Moss Rosenberg Verft A/S, a member of the Kvaerner Group, recently delivered the liquefied petroleum g a s / c h e m i c a l tanker Hektor to A/S Nordsjogas of Stavanger, Norway. The ship has a total cargo capacity of 24,000 cubic meters divided in three tanks. These are designed for carrying propane, butane, ammonia, vinyl chloride (VCM) as well as mixtures of propane and butane.
Two types of cargo can be carried simultaneously.
Hektor is built according to Det norske Veritas class + 1A1, Ice C, EO, Tanker for Liquefied Gas.
She is constructed in accordance with U.S. Coast Guard Rules and Regulations for Foreign-Flag Vessels, and also complies with IMCO Gas Code Regulation A 328 IX.
The ship has an overall length of 157.80 meters, beam of 24.40 meters, and depth of 16.00 meters (517.7 by 80 by 52.5 feet). At maximum draft of 10.70 meters (35.1 feet), she has a deadweight of 20,000 tons; gross tonnage is 15,819.
The ship is built with a single deck and without forecastle and poop. All accommodations and the engine room are arranged aft.
Seven watertight bulkheads subdivide the ship, which is built with double bottom and single shell.
The shell, main deck, and inner bottom in the cargo area are fabricated of steel meeting the requirements of a secondary barrier for cargo containment.
Hektor has three independent, self-supporting cargo tanks of prismatic shape. They are designed for carrying fully cooled LPG, NHs, and VCM operating with a slight overpressure; lowest permissible temperature is minus 48 C. The tanks are built as a welded structure of plates of low-temperature steel, and insulated on the outside with polyurethane.
All pipe connections to the car- go tanks are connected to the tank dome. Discharging is carried out in about 10 hours by six deepwell pumps, two in each tank.
Crossovers connect the ship's loading /discharge lines with loading arm on shore. Boil-off from the cargo is fed to the onboard reliquefaction plant, which consists of three two-stage units that reliquefy the gas and return it to the cargo tanks.
Main propulsion is by a Horton/ Sulzer 6RND76M diesel with maximum continuous rating of 14,400 bhp at 122 rpm. Trial speed was 17.5 knots at a draft of 9.2 meters (about 30.2 feet). Two side thrusters are installed, one forward and one aft.
The ship is equipped with a gas detector and an inert gas plant; both are of Moss design and were fabricated by Moss Verft. Navigation equipment includes two radars, Decca Navigator, radio direction finder, gyrocompass system, autopilot, echosounder, and magnetic compasses.
Other stories from January 1981 issue
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