JOHNSON CONTROLS
62
FORM 160.67-O2
ISSUE DATE: 10/9/2020
SECTION 3 - SYSTEM COMPONENTS DESCRIPTION
Hotwell (Condensate) Pump
The hotwell pump(s) is a 5 HP, 3600 RPM motor driven
direct connected pump with a maximum suction pres-
sure of 5 psig. The pumps have a minimum NPSH re-
quirement of 2 feet. The hotwell pump is automatically
controlled during operation to remove condensate as it
builds up in the condenser. Concurrently it maintains a
constant level in the hotwell for proper operation of the
steam condenser through automatic modulation of both
the recirculation valve and overboard valve located in
the hotwell pump discharge piping.
Vacuum Pump
The vacuum pump(s) is a 7.5 HP, 1800 RPM motor
driven direct connected single stage liquid ring type
pump designed for continuous operation. An impeller
is located in a cylindrical casing and is offset from the
rotor axis. The impeller transmits the driving power to
the water liquid ring which forms concentrically to the
casing when the pump is started. As the liquid moves
outwards, non-condensible gas, (air), is drawn into the
pump, compressed and expelled through the discharge
port into a discharge separator that separates the water
from the air. Water is drained and not recirculated to
the pump. Approximately 3.5 GPM of make-up water
is required to maintain the liquid seal ring while the
vacuum pump is in operation.
Level Control
The condensate level in the hotwell is controlled auto-
matically during operation by a level control system.
The level measurement transmitter senses the conden-
sate level in the hotwell and sends a 4-20 mA signal to
the OptiView™ control center which in turn sends a
control signal to position the condensate recirculation
valve and the condensate overboard valve. The level
control system includes a visual magnetic level gauge.
High level trip and low level alarm switches are wired
to the control center to provide the safety functions re-
quired.
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