1.3 Derating of output in gas mode
1.3.1 Derating due to methane number and charge air receiver temperature
Figure 1.1 Derating due to methane number and charge air receiver temperature
NOTE! Compensating a low methane number gas by lowering the charge air receiver temperature below
45 °C is not allowed.
Minimum charge air receiver temperature is 35°C.
Compensating a higher charge air receiver temperature than 55 °C by a high methane number
gas is not allowed.
The dew point shall be calculated for the specific site conditions. The minimum charge air re-
ceiver temperature shall be above the dew point, otherwise condensation will occur in the charge
air cooler.
Each +10 °C higher charge air receiver temperature from 45 °C means a 18 kPa higher charge
air pressure. This will have influence on the K
GAS
derating and on the K
TC
derating calculation.
The charge air receiver temperature is approximately 5-10 °C higher than the charge air coolant
temperature at rated load.
Glycol usage in cooling water according to document DAAE062266.
2 Product Guide Wärtsilä 34DF - 3/2012
Product Guide
1. Main Data and Outputs
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