The first of four icebreaking product-tankers ordered by Neste Oy, the Finnish state oil concern, from Nobiskrug, the West German builders. She is scheduled to operate on charter in northern Canada, where she will be joined by the third of the new ships; the second and fourth of the series are expected to join the Kiisla (see Abstract No. 37,511, Aug. 1974) and other ships serving the Gulf of Bothnia oil depots. Principal particulars of the Lumni are: Length, o.a. - 164.45m; b.p. - 150 m; Breadth, moulded, waterline - 23.5 m; main deck - 22.2 m; Depth, moulded - 32 m; Draught, summer - 9.5 m; Deadweight - 15,955 tonnes; Register tonnage - 10,975 gross; 5,941 net; Main engines - Two Mak 12M551AK Diesels, 7,800 bhp each at 425 rpm; single screw. Speed, service - 14.5 knots; Classification - DNV, with Ice Class, M.V., and EO notations; Finnish Ice Class 1A Super. The ship is of double-hull construction, with wing tanks extending from the double bottom to the main deck, and has close framing forward and aft. Other features for service in ice include high installed power, an ice-breaking bow, two watertight bulkheads forward of No. 1 cargo tank, an ice-knife and skeg at the stern, a totally-enclosed motor lifeboat, a helicopter pad, and a Wartsila air-bubbler system. The wheelhouse is circular. A bow-thruster is fitted. There are four cargo- tanks, sub divided by a centerline bulkhead to form eight completely- segregated compartments, each with a deepwell pump. The two main engines drive the single c.p. propeller through reduction gearing and clutch- couplings, and each also drives a 6-kV, 3,500-kVA shaft alternator through step-up gearing and a clutch-coupling. This arrangement allows the following modes of operation: (i) At sea in free water: one engine drives the propeller and an alternator. (ii) In ice: both engines drive the propeller, and one alternator is driven. (iii) Cargo working: one main engine drives an alternator (there are also two independent alternator-sets for use in port). A comprehensive load-sharing system is provided. The electrical system incorporates high-voltage circuit-breaker "trucks"; this is the first shipboard use of this new type of circuit-breaker, which is mounted in a frame and can be replaced as a complete unit. Other features of the ship include flexible mounting, and flexibly connected companionways to the machinery casing, for the five-tier deckhouse. The article gives further information on the ship and in particular her machinery, equipment, and accommodation, and includes general-arrangement and engine-room drawings.

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    Engineering, Chemical and Marine Press, Limited

    33-39 Bowling Green Lane
    London EC1P 1AH,   England 
  • Publication Date: 1976-10

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  • Accession Number: 00148457
  • Record Type: Publication
  • Source Agency: British Ship Research Association
  • Files: TRIS
  • Created Date: Feb 23 1977 12:00AM