● Fuel feeder/booster units
To enable pumping the temperature of bunker tanks must always be maintained 5...10°C
above the pour point, typically at 40...50°C. The heating coils can be designed for a temperature
of 60°C.
The tank heating capacity is determined by the heat loss from the bunker tank and the desired
temperature increase rate.
Fig 6-3 Fuel oil viscosity-temperature diagram for determining the pre-heating
temperatures of fuel oils (4V92G0071b)
Example 1: A fuel oil with a viscosity of 380 cSt (A) at 50°C (B) or 80 cSt at 80°C (C) must be
pre-heated to 115 - 130°C (D-E) before the fuel injection pumps, to 98°C (F) at the separator
and to minimum 40°C (G) in the bunker tanks. The fuel oil may not be pumpable below 36°C
(H).
To obtain temperatures for intermediate viscosities, draw a line from the known
viscosity/temperature point in parallel to the nearest viscosity/temperature line in the diagram.
Example 2: Known viscosity 60 cSt at 50°C (K). The following can be read along the dotted
line: viscosity at 80°C = 20 cSt, temperature at fuel injection pumps 74 - 87°C, separating
temperature 86°C, minimum bunker tank temperature 28°C.
6-8 Wärtsilä 46F Product Guide - a19 - 1 December 2017
Wärtsilä 46F Product Guide6. Fuel Oil System
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