other cold pour joints. Basin wall sections shall be made in a second
continuous pour, contain the necessary reinforcing steel as submitted by
the manufacturer and approved, and be arranged to interlock with the
water-stop seal in the floor slab, forming a completely waterproof basin.]
2.5.13
Electric Basin Heater
Heater shall be the electric immersion type with water-tight junction boxes
mounted in the basin with sufficient capacity to maintain the basin water
temperature above 4.4 degrees C 40 degrees F at an ambient temperature of
[_____] degrees C degrees F. Heater shall be complete with control
thermostat, transformer, contactor, and low water level heater protection.
2.5.14
Hot Water Distribution System
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NOTE: The gravity-flow type distribution system
will be the system of choice. Pressurized-flow type
systems will typically only be specified for
field-erected, counterflow type towers
Piping connecting to a cooling tower will be
externally supported, independent of the tower
structure and piping.
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Water distribution shall be the [gravity-flow] [pressurized-flow] type
system which distributes waters evenly over the entire fill surface. Each
tower cell shall be designed so that a water flow of 140 percent capacity
will not cause overflowing or splashing. The distribution system for each
cell shall include adjustable flow control valves. The entire distribution
system shall be self-draining and nonclogging. Piping shall be either cast
iron, ductile iron, threaded-glass-fiber reinforced epoxy pipe,
polypropylene, PVC or Schedule 80 black steel.
2.5.14.1
Gravity-Flow System
System shall be provided with open basins which include a splash box or
baffles to minimize splashing of incoming hot water and holes that evenly
distribute the water over the entire decking area. Holes used in a water
basin shall be provided with ceramic or plastic orifice inserts.
2.5.14.2
Pressurized-Flow System
System shall include piping, fittings, branches, and spray nozzles. Spray
nozzles shall be stainless steel, bronze, polypropylene, or high-impact
plastic. Nozzles shall be cleanable, nonclogging, removable, and spaced
for even distribution.
2.5.14.3
Basin Cover
Hot water distribution basins shall be provided with the tower
manufacturer's standard removable, [wood] [zinc-coated steel] [stainless
steel] [FRP] covers. Covers shall prevent airborne debris from entering
the basin.
2.5.15
Drift Eliminators
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SECTION 15645A
Page 15
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