combustible mixture. With low gas flow, inert gas is
injected at the flare nozzle to prevent air ingress.
Traditionally, considerable amounts of hydrocarbons have been more or less
continuously pilot is used to ensure
ignition of hydrocarbons in the flare.
Stronger environmental focus has elimintated continuous flaring and the pilot in
many areas. Vapors and flare gas are normally recovered, and only in exceptional
situations does flaring occur. To avoid the pilot flame, an ignition system is used to
ensure safe ignition even when large volumes are discharged. One patented solution
is a “ballistic ignition” system which fires burning pellets into the flare gas flow.
5.4 Instrument air
A large volume of compressed air is required for the control of pneumatic valves and
actuators, tools and purging of cabinets. It is produced by electrically driven screw
compressors and further treated to be free of particles, oil and water
5.5 HVAC
The heat, ventilation and air conditioning system (HVAC) feeds conditioned air to
the equipment rooms, accommodations etc. Cooling and heating is achieved by way
of water cooled or water/steam heated heat exchangers. Heat may also be taken off
gas turbine exhaust. In tropic and sub-tropic areas, the cooling is achieved by
compressor refrigeration units. Also, in tropical areas gas turbine inlet air must be
cooled to achieve sufficient efficiency and performance. The HVAC system is
usually delivered as one package, and may also include air emissions cleaning. Some
HVAC subsystems include:
· Cool: Cooling Medium, Refrigation System, Freezing System
· Heat: Heat medium system, Hot Oil System.
One function is to provide air to equipment rooms that are safe by positive pressure.
This prevents potential influx of explosive gases in case of a leak.
combustible mixture. With low gas flow, inert gas isinjected at the flare nozzle to prevent air ingress.Traditionally, considerable amounts of hydrocarbons have been more or lesscontinuously pilot is used to ensureignition of hydrocarbons in the flare.Stronger environmental focus has elimintated continuous flaring and the pilot inmany areas. Vapors and flare gas are normally recovered, and only in exceptionalsituations does flaring occur. To avoid the pilot flame, an ignition system is used toensure safe ignition even when large volumes are discharged. One patented solutionis a “ballistic ignition” system which fires burning pellets into the flare gas flow.5.4 Instrument airA large volume of compressed air is required for the control of pneumatic valves andactuators, tools and purging of cabinets. It is produced by electrically driven screwcompressors and further treated to be free of particles, oil and water5.5 HVACThe heat, ventilation and air conditioning system (HVAC) feeds conditioned air tothe equipment rooms, accommodations etc. Cooling and heating is achieved by wayof water cooled or water/steam heated heat exchangers. Heat may also be taken offgas turbine exhaust. In tropic and sub-tropic areas, the cooling is achieved bycompressor refrigeration units. Also, in tropical areas gas turbine inlet air must becooled to achieve sufficient efficiency and performance. The HVAC system isusually delivered as one package, and may also include air emissions cleaning. SomeHVAC subsystems include:· Cool: Cooling Medium, Refrigation System, Freezing System· Heat: Heat medium system, Hot Oil System.One function is to provide air to equipment rooms that are safe by positive pressure.This prevents potential influx of explosive gases in case of a leak.
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