WORKSHOP MANUAL W26 Wärtsilä NSD Nederland B.V. Engine type W26
Chapter 1.1
Subject Fuel System
Issue date June '00
Advised relation Sodium / Vanadium SODIUM CONTENT 60
Max Sodium
Sodium [ppm]
50 40
Extreme fuel Specification
30 20 10 0 0
100
200
300
400
500
600
Vanadium [ppm]
Engine configuration at various use of fuel If a HFO-engine is running for a long time ( more than 500 hours ) on MDO/LFO the valve rotator 1501ZT108, rotation speed 15 min-1 (high speed turnomat) should be replaced by 1501ZT174, rotation speed 5 min-1 (low speed turnomat). Specific energy of fuel Specific energy is not controlled in the manufacture of fuel except in secondary manner by the specification of other properties. Specific energy (MJ/kg) can be calculated with a degree of accuracy acceptable for normal purposes from the equations given below. Specific energy (gross), QG = (52,190 - 8,802ρ²10 exp-6) × [1 - 0,01 (x + y + s)] + 9,420 (0.01s) Specific energy (net), QN = (46,704 - 8,802ρ²10 exp-6 + 3,167ρ10 exp-3) × [1 - 0,01 (x + y + s)] + 0,01 (9,420s - 2,449x) Where ρ x y s
is the density at 15°C, in kilograms per cubic meter; is the water content, expressed as a percentage by mass; is the ash content, expressed as a percentage by mass; is the sulphur content, expressed as a percentage by mass.
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