WÄRTSILÄ WARTSILA 20, Product Manual

Page: 47 / 178

6.1.3 Liquid bio fuels
The engine can be operated on liquid bio fuels according to the specifications in tables "6-3
Straight liquid bio fuel specification" or "6-4 Biodiesel specification based on EN 14214:2012
standard". Liquid bio fuels have typically lower heating value than fossil fuels, the capacity of
the fuel injection system must be checked for each installation.
Table "Straight liquid bio fuel specification" is valid for straight liquid bio fuels, like palm oil,
coconut oil, copra oil, rape seed oil, jathropha oil etc. but is not valid for other bio fuel qualities
like animal fats.
Renewable biodiesel can be mixed with fossil distillate fuel. Fossil fuel being used as a blending
component has to fulfill the requirement described earlier in this chapter.
Table 6-3 Straight liquid bio fuel specification
Test method ref. Limit Unit Property
ISO 3104 100 cSt Viscosity at 40°C, max. 1)
1.8 cSt Viscosity, before injection pumps, min.
24 cSt Viscosity, before injection pumps, max.
ISO 3675 or 12185 991 kg/m³ Density at 15°C, max.
FIA test Ignition properties
2)
ISO 8574 0.05 % mass Sulphur, max.
ISO 10307-1 0.05 % mass Total sediment existent, max.
ISO 3733 0.20 % volume Water before engine, max.
ISO 10370 0.50 % mass Micro carbon residue, max.
ISO 6245 / LP1001 0.05 % mass Ash, max.
ISO 10478 100 mg/kg Phosphorus, max.
ISO 10478 15 mg/kg Silicon, max.
ISO 10478 30 mg/kg Alkali content (Na+K), max.
ISO 2719 60 °C Flash point (PMCC), min.
ISO 3015 3) °C Cloud point, max.
IP 309 3) °C Cold filter plugging point, max.
ASTM D130 1b Rating Copper strip corrosion (3h at 50°C), max.
LP 2902 No signs of corrosion Rating Steel corrosion (24/72h at 20, 60 and 120°C), max.
ASTM D664 15.0 mg KOH/g Acid number, max.
ASTM D664 0.0 mg KOH/g Strong acid number, max.
ISO 3961 120 g iodine / 100
g
Iodine number, max.
LP 2401 ext. and LP
3402
Report 4) % mass Synthetic polymers
Remarks:
If injection viscosity of max. 24 cSt cannot be achieved with an unheated fuel, fuel oil system has to be equipped with a
heater.
1)
Ignition properties have to be equal to or better than requirements for fossil fuels, i.e. CN min. 35 for MDF and CCAI max.
870 for HFO. 2)
Cloud point and cold filter plugging point have to be at least 10°C below the fuel injection temperature.
3)
Biofuels originating from food industry can contain synthetic polymers, like e.g. styrene, propene and ethylene used in
packing material. Such compounds can cause filter clogging and shall thus not be present in biofuels.
4)
Wärtsilä 20 Product Guide - a13 - 6 September 2016 6-5
6. Fuel Oil System Wärtsilä 20 Product Guide