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12.0 TROUBLESHOOTING
12.1 Low Temperature
The only reasons for a deaerator to operate at less than saturated steam temperature
are lack of steam or improper venting:
12.1.1 Insufficient steam
Insufficient steam may result from an undersized pressure reducing valve or an
insufficient supply of steam due to other causes. The pressure-reducing valve furnished
is sized for specific pressures, temperatures, percentages of returns and make-up water.
Changes in these values will affect its operation.
12.1.2 Insufficient venting
Insufficient venting can be traced to the vent valve and its associated piping. This valve
is furnished with an orifice in its disc for minimum venting. Rapid accumulation of
released gases may require that the valve be opened wider to accommodate their
evacuation to atmosphere. Low water temperature is an indication of insufficient
venting. Adjust valve opening accordingly. Vent piping must be vertical, full size, and
free of bends or obstructions. No other valves should be installed in this line.
12.2 Vibration, Rumble and Hammer
These can be caused by low steam pressure or blockage of internal steam passages in
the deaerator.
12.2.1 Low steam pressure
Low steam pressure may result from an undersized pressure reducing valve, improper
steam piping, malfunction of the pressure reducing valve or an insufficient supply of
steam. Check size, capacity, proper operation of pressure reducing valve as well as
steam supply and pressure.
12.3 Oil Contamination
A likely source would be one of the following:
12.3.1 Condensate
Condensate contaminated by oil, possibly from a leaking heat exchanger.
12.3.2 Improper grade of oil
Improper grade of oil used in steam driven equipment.
12.3.3 Oil separator not draining properly.
After locating and rectifying the cause, the deaerator must be drained and thoroughly
cleaned before returning to service.
12.4 Water Level
12.4.1 Wide fluctuations
Wide fluctuations in water level are to be avoided since they may cause rumbling or
variations in both temperature and pressure. They following precautions should be
observed:
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