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MAN B&W
Inlet Flow Meter
A flow meter <strong>is</strong> installed to measure the net inlet
gas flow. It <strong>is</strong> installed between the inlet pre�filter
and the coalescing filter.
High Pressure Gas Buffer System
The high�pressure gas buffer cons<strong>is</strong>ts of three
pressure vessels connected between the compressor
d<strong>is</strong>charge and the engine gas delivery
system. Their purpose <strong>is</strong> to provide smoothing
of minor gas pressure fluctuations in the fuel gas
supply, because of the engine’s demand for low
variations in fuel gas supply pressure.
Thus, the high�pressure gas from the compressor
package, <strong>is</strong> delivered at a steady flow to the MAN
B&W gas injection system.
Control System
A Compressor Package Controller (CPC) carries
out operational control of the Flotech package.
The CPC cons<strong>is</strong>ts of a Programmable Logic Controller
(PLC), Unit Process Controller (UPC) and
an Operator Panel (OP), and <strong>is</strong> located separately
from the compressor package skid.
Normal start/stop operation, safety protection,
process monitoring and fault annunciation of the
compressor package <strong>is</strong> carried out by the PLC.
Both normal and out�of�limit conditions are observed
by the PLC. Out�of�limit conditions will
cause the PLC to activate either an alarm or a
compressor package shutdown (trip).
An Operator Panel (OP) in the control cabinet door
d<strong>is</strong>plays the current operating status of the PLC
and allows the operator to view process readings,
alarm and trip set�points, and to reset plant trips.
The compressor <strong>is</strong> 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.
MAN Diesel
7.09
Page 5 of 7
A Unit Process Controller (UPC) regulates the
dynamic capacity control of the compressor by
varying compressor speed, inlet gas pressure and
recycle valve position. The capacity control can
be varied in the range of 0�100 %, while maxim<strong>is</strong>ing
energy savings by the use of gas recycling
and inlet gas pressure throttling control.
Gas Blow�down and Recovery System
The gas blow�down and recovery system cons<strong>is</strong>ts
of a gas storage volume with pressure vessels
connected together in a battery to form a
high volume buffer. It <strong>is</strong> designed to minim<strong>is</strong>e the
release of gas to atmosphere in the event of a
compressor package shutdown or a requirement
to de�pressur<strong>is</strong>e the engine supply lines. On compressor
start, the gas previously recovered and
stored in the blow�down system <strong>is</strong> re�consumed
by the compressor. The PLC optim<strong>is</strong>es the
use of th<strong>is</strong> gas storage volume and prevents
over�pressuring of the gas supply line by control
of the package inlet valve. The package inlet valve
has an adjustable slow�opening function; th<strong>is</strong>
valve <strong>is</strong> opened after start up by the compressor,
when the blow�down system has been evacuated
to a preset pressure.
MAN B&W ME�GI engines ME�GI engines 198 48 85�8.4