Page 61: of Maritime Reporter Magazine (December 1998)

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In accordance with contractual require- ments, the vessel has been engineered and faired to maintain at least 21.1-knots on the design draft at 85 percent engine output, with 20 percent sea margin. The fact that she achieved more than 23 knots on trials is an indication of her latent power, but the expecta- tion that she will be able to keep to 21 knots even in conditions where existing trailerships of 17-19 knots have to slow down is no less salient to the operation.

Tor Selandia provides the first sea-going ref- erence for the ZA50S engine, a continuation of the Swiss-developed Sulzer medium-speed lin- eage within the Wartsila NSD portfolio.

Remarkably compact in relation to their out- put, the two nine-cylinder models employed in the Swedish vessel rank among the world's most powerful in-line, four-stroke machinery.

Manufactured in north-east Italy by Grandi Motori Trieste (GMT), a partnership of the vessel's builder and engine licensor, the prime movers deliver a total 29,340-bhp at 450-rpm, driving twin, highly-skewed Kamewa controllable pitch pro- pellers through a Renk Tacke reduction gear- box. Although it incorporates many of the lauded features of the popular ZA40S engine, a unique feature of the latest design is the adop- tion of hydraulic actuation for the gas exchange valves, commonly employed in low-speed two-stroke machinery, but hitherto not used in the medium-speed domain. In the ZA50S, it is used in conjunction with pneumatically-controlled, load-depen- dent timing to provide variable inlet closing (VIC).

One result is a low level of exhaust emissions, an ever-more pressing consid- eration in the short-sea trades in partic- ular, such that the installation falls well within the IMO year 2000 limits pre- scribed for nitrogen oxide (NOx) output, while giving a substantial reduction in smoke emis- sions during part-load engine running. The other major result is improved fuel economy, with a flat fuel consumption profile across the engine's load range.

Circle 36 on Reader Service Card

CRANKSHAFT GRINDING

Tor Selandia

Main Particulars

Designer .. .Fincantieri

Flag Swedish

Classification Det Norske Veritas

Number of Sister ships Two (under construction)

Contract Date April 1996

Float out Date April 1998

Delivery Date December 1998

Length, o.a 648 ft. (197.5 m)

Length, b.p 590.5 ft. (180 m)

Breadth, molded 85 ft. (26 m)

Depth, to main deck 31.2 ft. (9.5 m)

Depth, to upper deck 54.5 ft. (16.6 m)

Gross Tonnage 21,700

Displacement 19.2 tons

Lightweight 10.5 tons

Deadweight 10,500

Draft (design) 23 ft. (7 m)

Draft (scantling) 24.6 ft. (7.5 m)

Lane meters 2,820

Speed, service 21.1 knots

Cargo Capacity 200 trailer 14 m, 2.8 lane m with a lane breadth of 2.95

Bunker 715 tons HFO, IF 380, 50 tons MD0

Water Ballast 7.1 tons

Fuel Consumption 67 tons/24 hour, with 15.3 kW output

Main Engine Mftr. Grandi Motori Trieste

Main Engine Type Sulzer 9ZA 50S

Total HP 21.6 kW (29.4 HP)

Auxiliary Engines 3 x Wartsila NSD 6S 220 U

Propellers 2 x Kamewa highspeed CP-propellers

Thrusters x Fincantieri each 1.1 kW

Generator Engines 3 x Wartsila NSD 6S 200 U at 900 kW

Generators STN Atlas 1.400 kW (Shaft Generators)

Emergency Generator Isotta Fraschini

Anti-Heeling System Flume

Couplings SKF

Reduction Gears Renk

Engine Controls Lyngsoe

Steering Controls Ulstein

Deck Machinery Kocks

Bearings Cederwall

Coatings Ameron

UHF Radio UHF

SSB Radio Standard Radio

Radar 2 x STN Atlas 9600

Compass C Plath

GPS x Trimble

Autopilot STN Atlas

Collision Avoidance STN Atlas

SATNAV Loran C

Air Conditioning AB Flakt

Lifeboats Greben

Liferafts Viking

Davits Grebe

Fire Fighting System C02, Water Spray

Desalination Equipment Alfa Laval

Doors/Ramps/Cargo Lifts Kvaerner

Cargo Control System Kockumatic

December, 1998 63

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