Propeller upgrade for Odfjell tankers

Odfjell's 'Bow Firda' is the first of eleven tankers set to receive Kappel blade, fairing cone and rudder bulb upgrades Odfjell's 'Bow Firda' is the first of eleven tankers set to receive Kappel blade, fairing cone and rudder bulb upgrades
Industry Database

MAN Diesel & Turbo is to retrofit and upgrade eleven 37,500dwt Kværner Class chemical tankers operated by Odfjell, with the first vessel – ‘Bow Clipper’ – due to be upgraded in August.

Each vessel has an MAN B&W two-stroke engine powering a four-bladed, controllable-pitch propeller and a power take off (PTO)-driven shaft alternator. The vessels’ new service speed at reduced main-engine output – combined with the implementation of MAN’s Kappel propeller blades, a fairing cone and a pre-fabricated rudder bulb kit – are expected to contribute to power savings and emissions reductions.

The blades, fairing cone and rudder bulb are customised for the tanker’s hull and rudder designs. The calculated power saving has been verified by tank-test analyses at Marintek.

Kjartan Ross, business development manager of MAN Diesel & Turbo’s Propeller & Aft Ship division, said: “With our new design possibilities, we are looking forward to offering this fuel-saving concept to other fleets with similar operational patterns. With the long lifetime expectancy of Odfjell’s vessels, this upgrade investment is straightforward and very attractive”.

Odfjell embarked on the Kværner Class newbuilding programme of 37,500dwt ships with 52 fully-segregated stainless-steel tanks and piping systems in 1991. The first was delivered in 1994 and the new series was packed with new technology: controllable pitch propellers, shaft alternators on main engines, bow thrusters, fixed tank-cleaning machines and radar positioned in each tank to gauge ullage.

Odfjell was also a pioneer of fully computer-controlled engines. The last ship in the series, Bow Firda, was delivered in 2003 and features the world’s firs main engine – a MAN B&W 7S50ME-C type – equipped with electronically controlled timing and no camshaft.

The Kværner Class vessels scheduled for upgrade are: Bow Flower, Bow Clipper, Bow Fortune, Bow Cecil, Bow Flora, Bow Cardinal, Bow Faith, Bow Cedar, Bow Fagus, Bow Chain and Bow Firda.

Principal particulars
Vessel type                                             Chemical tanker – double hull
Dead weight tonnage (mt)                       37,500
Length overall (m)                                  183.10
Breadth (m)                                           32.20
Draught (m)                                           10.65
Engine power (kW)                                 14,160
Max. engine and propeller speed (r/min)   117
Shaft-alternator power (kW)                     850
Propeller diameter (mm)                          6,300

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