dBa at a distance of 22.9 m 75 feet from the end of the exhaust piping with
the chiller operating at 100 percent of rated output capacity. The muffler
shall have a drain valve, nipple, and cap at the low-point of the muffler.
2.6.7.10
Exhaust System Connections
Flexible connectors shall be provided at the exhaust piping connection to
the engine. An expansion joint shall be provided in the exhaust piping at
the muffler connection. Flexible connectors and expansion joints shall
have flanged connections. Flexible sections shall be made of convoluted
seamless tube without joints or packing. Expansion joints shall be the
bellows type. Expansion and flexible elements shall be stainless steel
suitable for engine exhaust gas at 649 degrees C 1200 degrees F. Flexible
connectors and expansion joints shall be capable of absorbing vibration
from the engine and compensation for thermal expansion and contraction.
2.6.8
Compressor Driver, Steam Turbine
Steam turbine shall conform to NEMA SM 23 and be suitable for direct
connection to the compressor. Turbine shall have a capacity 10 percent
greater than the compressor brake horsepower requirement at full-load
condition. Steam strainer shall be either internally mounted or installed
in connecting piping. Turbine shall include sentinel warning valve,
forced-feed lubrication, oil cooler, oil reservoir, oil relief valve, oil
piping, oil-pressure gauge, tachometer, and gland-seal piping if a
condensing turbine is used. If a non-condensing turbine is used, provision
shall be made for drain piping. The turbine shall be suitable for
automatic control. An overspeed trip governor shall be provided to shut
off the steam supply at 115 percent of design speed. Provision shall be
made to stop the turbine upon operation of the compressor safety devices
and upon power failure by the use of a solenoid trip on the emergency
overspeed governor. Turbine shall be governed by a pneumatically
controlled hydraulic governor during automatic operation and with a manual
control effective during failure of the air supply. Pneumatic valve shall
be actuated by a temperature controller with its sensing element in contact
with the chilled water. Turbine shall be designed to operate at the steam
pressure and exhaust conditions indicated. If the turbine is a condensing
type, a surface-type steam condenser complete with single-stage air
ejector, inter- and after-condenser, electric-driven dual condensate pumps,
atmospheric relief valve, and expansion joint shall be furnished.
2.6.9
Compressor Driver Connections
**************************************************************************
NOTE: Delete the first set of brackets if a large
liquid-chilling package is specified. Delete the
second set of brackets if a condensing and
compressing unit or a small liquid-chilling package
is used.
**************************************************************************
[Each compressor shall be driven by a V-belt drive or direct connected
through a flexible coupling, except that flexible coupling is not required
on hermetic units. V-belt drives shall be designed for not less than 150
percent of the driving motor capacity. Flexible couplings shall be of the
type that does not require lubrication.] [Each machine driven through
speed-increasing gears shall be so designed as to assure self-alignment,
interchangeable parts, proper lubrication system, and minimum unbalanced
forces. Bearings shall be of the sleeve or roller type. Gear cases shall
SECTION 15620A
Page 33
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