2.11.4
Pneumatic
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NOTE: Pneumatic starting should be used on sets 750
kW and larger.
The complete compressed air system should be shown
on the drawings. Two receivers, redundant piping,
and two compressors may be required so that starting
capability is not lost when tank maintenance is
required. Valve arrangement shall permit any
receiver to be removed from service, drained,
repaired, or replaced without loss of starting air
from the system. The designer must analyze the
starting scenarios and determine the necessity to
provide a gasoline or diesel-engine-driven
compressor for a "black-plant" (no electrical
sources available) startup.
Each compressor shall be sized to restore in 15
minutes the air used in one engine start.
Each receiver shall be sized to provide sufficient
capacity to crank the largest engine for 60 seconds
at an ambient temperature of 21 degrees C (70
degrees F) without recharging.
2068.5 kPa (gauge) (300 psig) for cylinder
injection, 1034.2 kPa (gauge) (150 psig) for
air-motor starting is recommended for working
pressures.
Either motors or cylinder injection should be used
and the other paragraph deleted.
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A pneumatic starting system shall be provided. The compressed air system
shall be as specified in Section 15400A PLUMBING, GENERAL PURPOSE, for a
working pressure of [2.07 MPa 300 psi] [1.03 MPa 150 psi].
2.11.4.1
Air Driven Motors
Air driven motors shall be complete with solenoid valve, strainer, and
lubricator.
2.11.4.2
Cylinder Injection
Starting shall be accomplished by admitting compressed air into two or more
engine cylinders through a timing valve, or through a distributor into a
sufficient number of cylinders to assure successful starting regardless of
piston positions.
2.11.5
Starting Aids
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NOTE: Jacket coolant and/or lube-oil heaters are
normally provided for most applications to aid
starting. Some manufacturers may require glow plugs
SECTION 16263A
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