WÄRTSILÄ 31SG, Product Manual

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Pressure at engine during start, min. (alarm)
(20°C)
kPa 1500 1500 1500 1500
Pressure, max. kPa 3000 3000 3000 3000
Low pressure limit in air vessels kPa 1500 1500 1500 1500
Starting air consumption, start (successful) Nm 3 6.8 6.8 6.8 6.8
Notes:
Note 1 At ISO 15550 conditions (ambient air temperature 25°C, LT-water 25°C) and 100% load.
Flow tolerance 9%.
Note 2 At ISO 15550 conditions (ambient air temperature 25°C, LT-water 25°C) and 100% load.
Flow tolerance 9% and temperature tolerance 10°C in gas mode operation.
Note 3 At 100% output and nominal speed. The figures are valid for ambient conditions according
to ISO 15550 except for LT-water temperature, which is corresponding to charge air
receiver temperature 55ºC in gas operation with engine driven water and lubricating oil
pumps. Tolerance for cooling water heat 10%, tolerance for radiation heat 20%. Fouling
factors and a margin to be taken into account when dimensioning heat exchangers.
Note 4 Validity of the data in gas fuel operation: total barometric pressure, air temperature and
relative humidity according to ISO 15550:2002(E), LT water temperature corresponding
to receiver temperature 55°C. Lower calorific value 49 700 kJ/kg for gas fuel. With engine
driven pumps (two cooling water pumps, one lubricating oil pump). Tolerance 5%.
AE = Auxiliary engine driving generator
DE = Diesel-Electric engine driving generator
Subject to revision without notice.