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Inspection and Maintenance Procedures
INLET AIR SYSTEMS MAINTENANCE AND SYSTEM EQUIPMENT (GAS TURBINE)
Inlet Screen
Inlet screens are provided immediately upstream of the inertial separators to prevent the entry of birds,
leaves, twigs, papers and other similar objects. These screens must be kept free from any excess accumu-
lation of such debris to assure free air flow.
Inlet Filters
Refer to manufacturer's recommendations in Air Inlet and Exhaust System Tab in Volume II.
Bypass Door
Downstream of the filter elements is the bypass door(s). These doors are designed to open at a predeter-
mined static pressure depression, typically 5 in. (13 cm) w.g. The doors should normally never open.
They are designed as a safety measure to prevent turbine shutdown and/or inlet duct implosion due to
a sudden or abnormal blockage of the inlet system. Therefore, it is important that the air cleaning system
is serviced before the static depression builds up to the point of by-pass opening. The turbine is unpro-
tected and will be ingesting unfiltered air when the bypass door is open. The bypass door is gasketed
to prevent air leaks. This gasket should be checked periodically and repaired if possible leaks are found.
The by-pass door is supplied with a switch to alarm upon opening of the door. In the event of such an
alarm, action should be taken immediately to determine and rectify the cause.
Once a year the limit switch should be manually activated to determine proper circuit operation.
Inlet Compartment, Inlet Ductwork and Silencers
During periods of shutdown the inertial separators are not in operation. This allows any blowing dust
to pass through and enter the inlet compartment. Before starting the unit after periods of shutdown the
compartment must be inspected and cleaned out if necessary.
IMP–24
**WARNING**
Do not attempt to replace filter elements while the gas
turbine is in operation.
**WARNING**
Differential pressure across the inlet filter compart-
ment door while the gas turbine is operating may cause
rapid closure of the door or difficulty in opening the
door from inside the compartment. Entry into the fil-
ter compartment should not be attempted while the
turbine is operating unless special provisions for safe
entry have been made.
Inspection and Maintenance
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