IM-P537-01
EMM Issue 1
54
Pressurised Thermophysical deaerator with operator manual for the control unit
Problem
Possible causes
Corrective action
The deaerator
is not able to
maintain the
required pressure
when it is working
at maximum load
conditions.
Condensate temperature too high
Check the opening of the
manual valve for non-
condensable gas discharge on
deaerator head. If necessary,
open the exhaust more.
The pressure of the primary steam is
too low
Check the primary steam
pressure is correct and there
are no pressure losses when
the generator load increases.
Clean the filter upstream the
regulator valve. Check the
shut-off valve on the line is
completely open.
Primary steam blocked for the low
water level (even temporary).
See the part regarding the
problem: water level low,
generator in alarm.
The deaerator
remains cold
when switching
it on.
When working,
the pressure of
the deaerator
falls drastically
(heating
interruption).
Primary steam blocked for the low
water level.
See the part regarding the
problem: water level low,
deaerator in alarm.
The primary steam control valve is not
working correctly.
Check the solenoid valve
mounted on the regulating
pneumatic valve and relative
control panel protection fuse.
Check the air pressure is
correct. If necessary replace
the solenoid valve or fuse.
Fault/malfunctioning of pressure
controller (PIC-01).
Check the settings. Check
that the positioner of the
control valve (CV1) reaches
the control signal from the
controller. Switch to the
regulator manual control to
verify the operation of the
signal. If necessary replace
the controller.
Pressure transmitter (PT-01) fault
Check the transmitter signal
and that is corresponds to
the manometer measure.
If necessary replace the
transmitter.
Block pressure switch (PSH-01) on
Reset the block, through the
reset button on the control
panel.
