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Hanne Knutsen (Continued from page 32) as well as for the main alternators, auxiliary systems and electric mo- tors of the thrusters. Sea water cooling circuit pipes are made of copper-nickel. The loading System In addition to the conventional loading systems, the vessel is equipped with two "offshore" load- ing systems: one for articulated load- ing turrets (APC) and buoys (OLS); and a submerged turret loading sys- tem (STL). The Hanne Knutsen is reportedly the first newbuilding in- corporating both systems. The loading systems and tank arrangements are designed to handle crude oils with low vapor tensions in two segregations. Four transversal collectors have been installed in the cargo manifold for crude oil and two others to send the cargo vapors to shore. Inert gas is generated and purified in a Flexinert plant with the vapors com- ing from the main diesel genera- tors. The ship features a sophisticated integrated control system redun- dantly computerized with process stations and a local area network (LAN) with control stations in the engine room, cargo control and wheelhouse. The automation system in the engine room is designed to be oper- ated without personnel, and the automation in the wheelhouse is designed to be operated by one per- son. Hanne Knutsen Equipment List Main generators driving engines Sulzer Auxiliary generator engine Bergen Main propulsion electric motor ABB Electric generators AB Sterntube bearing Rolla Propeller NavaLips Emergency generating set Caterpillar F.W. generating plant Alfa Laval Coolers Alfa Laval Centrifugal pumps Kvaerner Eureka Screw pumps Kvaerner Eureka F.O. & L.O. Purifiers Alfa Laval Foam F.F. system Unitor Air compressors Roweco Sewage treatment plant Aries Steering gear Porsgrunn Transverse bow & stern thrusters Ulstein Active rudder Willi Becker Steel pipes Almesa/Cunado GRP pipes Sarplast Main switchboard & Cycloconverters ABB Electric cables (automation) Ericsson Fire detection Salwico DPS Simrad Radio communications S.R.M. Radars Atlas-Krupp Gyropilots Anschutz Doppler log Atlas-Krupp Echosounding Simrad Satellite navigator Saturn-ABB Bridge integration Kvaerner Eureka Integrated control system Simrad Deck machinery Ulstein Service crane Navacel Access hatches Faro Doors & Windows Aux. Naval Coatings Sigma Lifeboats & Davits Harding Modular cabins A.E.S.A. Air conditioning Novenco Pumps Kvaerner Eureka Oil monitoring system Seres Tank cleaning equipment Consilium Inert gas generating plant Maritime Protection Pressure & Vacuum valves Pres-Vac Cargo valves & Control system.... Kvaerner Eureka Cargo tanks level indicators Saab Gas detection equipment Omicron Yard: Chantiers de I'Atlantique Ship: Petronas Tanker Type: LNG Tanker Owner: Petronas Marine Length: 889 ft. (271.1 m) Breadth: 142 ft. (43.3 m) Depth (to upper deck): 103 ft. (31.4 m) Draft: 36 ft. (11 m) Total cargo volume: 130,300-cu.-m. Speed: 21 knots For more information on Chantiers de I'Atlantique Circle 49 on Reader Service Card Chantiers de I'Atlantique, a sub- sidiary of GEC Alsthom, delivered in July the first of five methane carriers for Petronas Marine of Malaysia. The keel for the first vessel was laid in September 1992, and the production schedule for the series of five will run through July of 1997. The 130,000-cu.-m. lique- fied natural gas (LNG) carriers have been constructed using automated manufacturing and assembly pro- cesses. Each ship has four tanks which are incorporated in the ship's metal structure. Liquefied natural gas is stored in four tanks, and the Petronas vessel is the first which combines the Gaz Transport Membrane system with a reduction in the number of tanks: four-cargo-tank design, as opposed to a design incorporating five or six cargo tanks, which was previously associated with the system. Thermal insulation for the liquid methane cargo is provided by a double layer of plywood boxes filled with perlite, an insulating powder made of volcanic materials. Gastightness is ensured by a ,7-mm thick membrane made of Invar, a steel and nickel alloy which has an extremely low coefficient of thermal expansion. For safety reasons, a second, identical membrane is placed between the two layers of boxes to ensure tightness in the event of a leak in the first mem- brane. To minimize the cost of as- sembly operation aboard the ships, components have been extensively standardized and widespread use has been made of prefabrication techniques. The construction of a carrier requires 50,000 plywood boxes, each measuring 3.3 ft. (1 m) by 3.9 ft. (1.2 m), which are pro- duced in a fully automated, pur- pose-built workshop on site. In ad- dition, the special Invar parts form- ing the tank corner structures are made in completely pre-fabricated 10-ft. (3-m) long elements. Special attention has been given to optimizing the supply of the many components installed aboard the ship. Materials are delivered by the erectors themselves using the just- in-time method with the aid of a computer system. One of the first operations car- ried out inside the tanks is to weld metal elements called coupler studs to the ship's double hull, working from data provided by a precision topographical survey. The studs anchor the first layer of boxes. Chantiers de I'Atlantique has devel- oped a special device for this pur- pose. The Dromadec system comprises a viewing unit, an on-board com- puter, a stud positioning arm and a welding torch. Using the topographi- cal data provided by a laser and a distance measuring device, the com- puter places each coupler at the desired position before welding it automatically to the double hull. Dromadec reportedly makes it pos- sible to achieve the precision speci- fications set for assembling the tank's insulation elements, namely a +/- .9-mm positioning accuracy for the studs relative to the topographi- cal data. Chantiers de I'Atlantique and a number of specialist firms worked to develop machines to au- tomate the welding of the mem- branes and achieve maximum qual- ity. A single ship requires 90,000 m ; of resistance seam welding and r 21,000 m of TIG welding. The ship is powered to a speed of 21 knots at 100 percent MCR (26,720 kW) at 93 ; rpm. The ship is designed to be 3 operated with the LR mark Unat- tended Machinery Space (UMS). 26D Maritime Reporter/Engineering News
