Decommissioning
Emergency generators

The power developed by a diesel engine depends on the mass of fuel and therefore the mass of air stored in the cylinder.

This air mass is a function :

• intake air temperature ;

• atmospheric pressure ;

• the low-temperature water circuit cooling the charge air.

The power of a diesel engine is therefore determined by these parameters, variations in which can lead to downgrading.

The standard specifies the following reference conditions:

• overall barometric pressure: 100 kPa ;

• air temperature: 25 ×C ;

• low water temperature: 25 ×C.

Downgrading tables vary from one engine manufacturer to another. Table 2 is an example of the downgrades that can be encountered.

The total downgrade is given...