shall not be in excess of that recommended by the engine manufacturer;
however, temperature differential shall not be greater than [_____] degrees
C degrees F for coolant in and out of the engine.
2.2.9.1
Air-Cooled Condenser
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NOTE: Designer will select proper speed, based on
air requirements. The larger units will generally
require the slowest speed motor but the type of fan
drive must also be considered. The fan speed and
pitch of the blades are determined from
manufacturer's rating data.
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Main core unit shall be suitable for condensing the vapor generated during
engine operation from zero to 110 percent of full load when there is no
utilization of the steam for useful purposes. A secondary core shall be
used for cooling the auxiliary system coolant. The condenser shall be the
[vertical] [horizontal] air discharge type with round tubes. Fins and
tubes shall be constructed of nonferrous materials; headers shall be of
carbon steel and of the plug type. Fins shall be firmly bonded to tubes;
tanks and supporting framework shall be constructed of steel; and fan shall
be adjustable-pitch type constructed of aluminum. Inlet and outlet coolant
connections shall be on one side. A drain cock shall be installed at the
low point of each core. A welded structural frame shall be provided for
entire unit, drilled and arranged for mounting on a concrete base, and
designed to withstand winds up to [80] [_____] km/hour [50] [_____] mph.
[Hail screens shall be provided in areas where hails storms are prevalent.]
Reliefs shall be provided to protect against excessive pressures and
temperatures developed in the system.
a.
The condenser shall be complete with motor-driven fan or fans and
with face dampers controlled by the condensate temperature. [Two
fans per bay shall be provided.] Excessive subcooling of the
condensate by overexposure to the air stream shall be avoided.
Freeze protection for all modes of operation shall be provided.
Fan tip speed shall not exceed 60 meters/second 12,000 feet/minute.
**************************************************************************
NOTE: Where motor starters for mechanical equipment
are provided in motor control centers, delete the
reference to motor starters.
**************************************************************************
b.
The fan motor shall be direct-connected or belt-connected to the
fan and shall have sealed bearings. The motor shall be
three-phase, squirrel cage induction type, [208] [460] volts at 60
Hz, synchronous speed not to exceed [1,200] [1,800] rpm. Motor
size shall be such that seasonal adjustments of the fan blade
pitch are not necessary to prevent motor overloads when ambient
air temperature drops to lowest value or rises to highest value
specified for the prime mover operating conditions. A 60 Hz,
across-the-line, enclosed type, magnetic motor starter having
thermal overload protection in each ungrounded phase shall be
provided. If the condenser fan motor is large enough to cause a
transient voltage dip of 20 percent or more during starting
inrush, a reduced-voltage type magnetic motor starter shall be
used. Connections shall be such that the fan motor shall start
SECTION 15845A
Page 12
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