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Inspection and Maintenance
auxiliary hydraulic pump, without properly charged accumulators in service, may result in unnecessary
hydraulic hammer and possible system damage.
COOLING AND SEALING AIR SYSTEM
General Notes
Loss of cooling air to various parts of the machine may cause hot wheel spaces, insufficient shell cooling
or reduction in bearing sealing air pressure. Small leaks or restrictions may result in loss of machine per-
formance or reduction in life of nozzles, buckets and wheels. Large leaks or restrictions may result in
complete machine failure and, in case of sealing air, bearing oil leaks and fire if an ignition source is
present.
Piping System
Using the Cooling and Sealing Air Piping Schematic as a guide, check that all orifice-flange-plates are
in their respective locations. If not already done, it may be wise to identify the orifice size on the tab of
the plate and locate the tab in the most convenient and accessible location for viewing when assembled.
When union orifices are used verify that the orifice is in position in the union by the tab protruding thru
the hole.
Compressor Bleed Valve (VA2-1 and -2)
These valves should operate freely with no evidence of sticking. Where sticking is evident, lubricate the
spring and inner cylinder of the air actuator of the valve with the spray lubricant WD40 or an equivalent
high temperature, anti-seize lubricant on a planned shutdown. Remove the air connection from the valve,
spray the lubricant into the actuator and exercise the valve several times.
Compressor Discharge Pressure Transmitter (96CD)
Check that the transmitter is calibrated within the limits described in the Control Specification.
STARTING SYSTEM
Diesel Engine
See Vendor's Preventive Maintenance Procedure in Starting Systems Tab, Volume II.
Electric Motor
See Vendor's Preventive Maintenance Procedure in Starting Systems Tab, Volume II.
**WARNING**
The compressor bleed valves must be checked, lubri-
cated and operated when cool. Do not attempt this
servicing on hot valves or during unit operation.
Inspection and Maintenance Procedures
IMP–13
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