Those of you new to the technologies associated with two types of deaerators that you may be considering for your manufacturing or processing work in the near future can take a look at this short list of common problems that even experienced users are faced with from time to time.
Whether you are going to be utilizing a tray type or spray type deaerator will be immaterial at this stage, but perhaps this troubleshooting list could be of some help in helping you make a final decision.
The first question raised is this. Why would there be high levels of oxygen in and around your tray. The possible causes linked to this is that there could be air in-leakage, an insufficient stabilization period or the tray has not been correctly installed and in place. There may be no steady state conditions or the water inlet temperature could be too low. Also, improper venting or incorrect testing could be the common cause.
Solutions suggested run as follows. The scavenger may need to be shut off. If not that, chemical interferences may need to be removed. You may also have to verify your own design conditions.
Possible causes of excessive pressure fluctuations may have something to do with steam PRV not being correctly sized or calibrated. Inlet steam pressure may be too high or low. There may also be an excessive inlet temperature variation. Or the heater may be flooding. Solutions to this cause include the checking of size and calibration, maintaining a correct design range and/or checking all valve and control settings.
Finally, low outlet temperatures may be caused by incorrect thermometer readings or an insufficient steam flow. In these cases, calibration and steam supply levels need to be checked.