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MAN B&W 7.09
Safety aspects
The compressors are delivered generally in accordance
with the API�11P standard (skid�packaged
compressors) and are designed and certified in
accordance with relevant classification society
rules.
Maintenance
The gas compressor system needs an annual
overhaul. The overhaul can be performed by the
same engineers who do the maintenance on the
main engines. It requires no special skills apart
from what <strong>is</strong> common knowledge for an engineer.
External systems
External safety systems should include a gas
analyser for checking the hydrocarbon content of
the air, inside the compressor room and fire warning
and protection systems.
Safety devices � Internal systems
The compressors are protected by a series of
Pressure High, Pressure Low, Temperature High,
Vibration High, Liquid Level High/Low,
Compressor RPM High/Low and Oil Low Flow
trips, which will automatically shut down the compressor
if fault conditions are detected by the local
control system.
Pressure safety valves vented to a safe area guard
against uncontrolled over�pressure of the fuel gas
supply system.
Inert gas system
After running in the gas mode, the gas system on
the engine should be emptied of gas by purging
the gas system with inert gas (N 2 , CO 2 ),
Core Compressor Unit
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The core unit <strong>is</strong> a GE�Flotech high�pressure fuel
gas compressor package, which cons<strong>is</strong>ts of an
electric motor directly coupled to a four�stage gas
compressor, model F604, complete with relevant
control, cooling, filtering and lubricating systems.
The power consumption of the compressor <strong>is</strong>
max. 3,580 kW.
The compressor <strong>is</strong> balanced therefore giving little
or no vibrations and <strong>is</strong> therefore ideal for off shore
installations.
Main Drive System
The main drive system cons<strong>is</strong>ts of an electric motor,
flywheel and a torsionally rigid, flexible drive
coupling. The drive speed <strong>is</strong> controlled by an
electronic variable speed drive (VSD).
Cooling System
The cooling system cools the compressed gas
after each compressor stage and stabil<strong>is</strong>es the
temperature of the recycle gas. The compressor
frame lubricating oil <strong>is</strong> air�cooled. The cooling
system <strong>is</strong> a closed circuit, with the cooling water
circulated by an electrically driven pump through
a radiator and a gas to water heat exchanger.
Inlet Filtration
Inlet filtration <strong>is</strong> included to remove particulate
matter and entrained liquids from the gas stream.
Filtration <strong>is</strong> done in two stages compr<strong>is</strong>ing a
pre�filter followed by a coalescing filter. The inlet
pre�filter includes a vane�pack, to remove free
liquids, and a particle filter. The coalescing filter
precipitates and removes aerosols and liquids not
already removed by the inlet pre�filter.
MAN B&W ME�GI engines 198 48 85�8.4
MAN Diesel