springs and stops.
c.
Speed governor variable speed oil relay NEMA Class D governor for
speed limiting and pneumatic operator to maintain an adjustable,
preset draft pressure in boiler by variation of turbine speed.
Input to the operator shall be a 30 to 103 kPa (gage) 3 to 15 psig
pneumatic signal. Provide an electro-pneumatic transducer to
accept the 4 to 20 mA signal from the controller specified in VAMS
Section 15901N CONTROLS AND INSTRUMENTATION BOILER PLANT.
[Turbine shall go to maximum rated speed on air failure.]
d.
Emergency Overspeed Governor. Completely independent of the speed
governor and shall operate a separate trip valve.
e.
Insulation. Turbine shall be insulated and lagged by the
manufacturer as specified under Section 15080 THERMAL INSULATION
FOR MECHANICAL SYSTEMS.
f.
Reduction Gear. High speed, heavy duty, double helical, full
pressure lubricated, horizontal offset type with a service factor
not less than 2 provided in a horizontally split casing. The gear
and pinion shall be spray lubricated from a pressure lubricating
system. The pressure lubricating system shall include a shaft
driven oil pump, strainer, cooler, pressure gage, low oil pressure
switch, relief valve, reservoir and piping. Provide a high speed,
gear type, forged steel coupling between the turbine and the gear.
Reduction gear and turbine shall [each] be provided with a
[common] [_____] mm inch thick steel baseplate[s].
2.6.2.6
Noise Level
Not to exceed 85 dBA sound pressure level at 1 1/2 meters 5 feet above the
floor and 1 1/2 meters 5 feet from the fan in any direction. Sound
attenuation shall be provided to meet the sound pressure level requirements.
2.7
COMPRESSED AIR SYSTEM
2.7.1
Plant Air Compressor
Provide two plant air compressor systems, each with a compressor, filters,
intercooler, aftercooler, accessories, control panel and controls. Provide
a receiver for each of the two compressor systems.
2.7.1.1
Air Compressor
**************************************************************************
NOTE: Select standard L/s SCFM of air to compensate
for plant elevation.
**************************************************************************
Packaged unit, FS XX-C-2816, as modified below. Each compressor capacity
shall be not less than [94] [118] [142] [165] standard L/s [200] [250]
[300] [350] scfm of air, at 20 degrees C 68 degrees F and [862] [1379] kPa
(gage) [125] [200] psig at the discharge.
Compressor speed shall not
exceed [_____] rpm. Compressor shall be [belt drive] [direct drive] double
acting, two stage, with flange mounted water cooled cylinders and heads.
Provide a safety valve between each compressor discharge and its shutoff
valve which is required on the discharge piping of the compressor. Provide
a full flow type oil filter for positive forced feed lubrication and an
SECTION 15502N
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