373 watt 1/2 horsepower and larger shall be three-phase, unless otherwise
indicated. Ratings shall be adequate for the duty imposed, but shall not
be less than indicated.
2.2.4.2
Motor Controls
Where a motor controller is not shown in a motor control center on the
electrical drawings, a motor controller shall be provided. Where required,
motor controllers shall be provided complete with properly sized thermal
overload protection and other equipment at the specified capacity including
an allowable service factor, and other appurtenances necessary for the
motor control specified. Manual or automatic control and protective or
signal devices required for operation specified and any wiring required to
such devices, not shown on the electrical drawings, shall be provided.
Where two-speed or variable-speed motors are indicated, solid-state
variable-speed controllers may be provided to accomplish the same function.
2.2.5
Heat Recovery Silencer for Diesel Engine
**************************************************************************
NOTE: The degree of silencing will match the
environmental requirement. In a retrofit
installation, the unit should match the original
silencer installation. As a general guide the
attenuation will be approximately as follows:
Measured at
Type of
Octave Band
Silencer
in dB
Frequency (Hz)
Industrial
25
250
Semi-Residential
30
250
Residential, Critical Area
35
250
Quiet Residential
37.5
250
Indicate pressure required. For most low-pressure
installations this will be 345 kPa (50 psig).
**************************************************************************
Each combination boiler silencer or supplementary silencer shall reduce the
generated sound spectrum to standard commercial level permitted for
[industrial] [semi-residential] [residential, critical] area. Exhaust gas
boiler shall be a combination boiler silencer or a boiler with a
supplementary silencer to meet the noise limits, and heat recovery unit
shall be constructed in accordance with ASME BPVC SEC VIII D1 for [_____]
Pa psig steam working pressure. The boiler shall be designed for maximum
efficient heat recovery under any load condition up to 110 percent of full
load with an exit exhaust gas temperature not less than 165 degrees C 330
degrees F. Each boiler shall be designed for continuous wet operation or
for periods of dry operation without interruption of the diesel engine
operation when located and connected as indicated. Provisions shall be
made for expansion and contraction to prevent overstressed conditions in
the pressure vessel during continuous wet or dry operation. Gas side
pressure drop through the boiler shall not exceed the recommendations of
the engine manufacturer. Each boiler shall be provided with standard
boiler trim including, but not limited to, pressure gauge, water gauge with
SECTION 15845A
Page 10
Previous Page
