SPX Cooling Technologies MARLEY CLASS 800 - Manual (Page 10)

10
Operation
Hot Water Distribution System
Hot water from the process flows through an inlet to each cell, which supplies a
distribution header and a system of branch arms and nozzles. Each distribution
header may be equipped with a vent standpipe to minimize water hammer,
to maintain a slightly pressurized water distribution system, and to provide
vacuum release at pump shutdown.
If an Amertap condenser tube cleaning system is part of plant
equipment, care should be taken during operation to back-wash
the strainer section only after the sponge rubber cleaning balls are
removed from the system by trapping them in the collector. Balls
that are allowed to enter the cooling tower supply piping may clog
some of the nozzles, although the generous flow paths through the
nozzles make this unlikely. However, balls escaping the nozzles
will accumulate on top of the fill, ultimately causing unequal water
distribution that will affect thermal performance. The top of the fill
should be frequently checked until such time as the operational
sequence of the Amertap system assures that no balls enter the
cooling tower distribution system.
Fill
Water leaving the nozzles is scattered uniformly over the fill plan area. The
water flows through the fill, coating each fill sheet to maximize water surface
exposure to the air being moved by the fans.
Drift Eliminators
Air leaving the fill passes through a level of drift eliminators covering the entire
plan area of the tower. The purpose of these drift eliminators is to minimize
the amount of water that is caused to exit the tower by the velocity of the
moving airstream.
Cold Water Collection Basin
Water leaving the fill falls into the cold water basin that forms the base of
the tower. The normal water level in the concrete basin is approximately 12”
(305 mm) below the top of the curb. Adjust the make-up water supply to
maintain approximately this water level. Maintain sufficient water depth to
prevent cavitation.
Caution