Page 63 - Offshore Electrical Engineering Manual

50 CHAPTER 4 Prime Mover Selection Criteria

FIGURE 2.4.2, cont’d

GAS TURBINE APPLICATIONS
The following can be applied to both forms of gas turbine and is designed to assist
the electrical engineer in the selection and application of gas turbines as prime
movers. It should be noted that there are many other considerations, beside those
in the following, involved when installing a turbine, but as they are of no direct
concern to electrical engineers, they are beyond the scope of this book. However,
some reference is made to firefighting facilities in generator rooms in PART 2
Chapter 15.

FUEL GAS SUPPLY DISTURBANCES

In most offshore situations (with the exception of storage and pumping stations)
the gas is being produced via the process plant from a production well. Changes in
well gas content, calorific value, pressure, etc. can have significant effects on engine
power output, which may in turn affect the production process and the fuel supply.
Slugs of condensate may also appear in the fuel gas supply, having a similar effect.