HEI DEAERATOR TROUBLESHOOTING GUIDE
Contents
1. Tech Sheet 105 To Heat Exchange Institute APOR ave 1300 Sumner Avenue Cleveland Ohio 44115 2851 e 216 241 7333 e Fax 216 241 0105 www heatexchange org HEI DEAERATOR TROUBLESHOOTING GUIDE This troubleshooting guide is an excerpt from the 7 edition of the Standards for Typical Specifications for Tray Type Deaerators and has been prepared to assist operators of deaerators The guide provides general guidance and operators are advised to consult with the manufacturer when necessary for specific instructions regarding their equipment Many of the items listed below are not in the scope of the deaerator manufacturer however these items do affect operation and must be considered by operators The troubleshooting guide refers to sections in the 7 edition of the Standards for Typical Specifications for Tray Type Deaerators for additional information The standard is available through the HEI office and can be ordered by contacting the HEI at hei heatexchange org or 216 241 7333 Possible Causes Comments or Possible Solutions Air in leakage Insufficient stabilization period Trays not installed properly and in place Not steady state conditions O inlet not in accordance with specified design conditions Spray valves not installed correctly Water inlet temperature too low Improper venting Incorrect testing See test procedures in section 7 4 Loose fittings Shut scavenger off Remove chemical inte2. erify CO design condition Lower pH Review vent system Install correctly Gradual increase decrease of controlled flows Check setting and system operation Check overflow level and boiler feed pump operation Refer to Excessive Pressure Fluctuation Repair or redesign Should be as short and as vertical as possible Reset vent flow Keep positive pressure on deaerator See High O This Tech Sheet was developed by the members of the Heat Exchange Institute s HEI Deaerator Section HEI is a trade association comprising the leading manufacturers of heat exchange and vacuum equipment HEI Tech Sheets are information tools and should not be used as substitutes for instructions from individual manufacturers Always consult with individual manufacturers for specific instructions regarding their equipment 3 24 03 Page 2 of 2 This sheet is reviewed periodically and may be updated Visit www heatexchange org for the latest version
3. on Oxide in Deaerator Tech Sheet 105 Heat Exchange Institute Possible Causes Steam PRV improperly sized or calibrated Improperly sized downcomer and equalizer Inlet steam pressure too high or too low Improper pilot installation Excessive inlet temperature variation Heater flooding Incorrect thermometer reading Insufficient steam flow Incorrect steam water ratio Spray valves or internals malfunctioning Heater flooding Inlet flows piped incorrectly Inlet flows mixing just prior to deaerator inlet Improper pipe design High inlet velocities High CO at inlet High pH Improper venting Tray hold down not secure Turbine trip Flashing Malfunctioning level control system Malfunctioning overflow or improper boiler feed pump operation Pressure fluctuations Cracked vent welds Improper vent piping Water carryover Condensate or system corrosion Frequent shutdowns High O Shading is provided for the ease of reading only Comments or Possible Solutions Check size and calibration Keep within design range Check all valve and control settings Check calibration Check steam supply Check for restrictions Check pipe and valve sizing Check heat and mass balances Check spray valves trays etc Check all valve and control settings Check all inlet flows and temperatures Mix flows farther upstream of deaerator Check and or redesign Keep within HEI V
4. rferences Operation outside of design conditions Verify design conditions Often high oxygen measurements can be traced to inadequate test procedures In order to conduct a proper test it is important that there be a sufficient stabilization period and steady state conditions The proper length of a stabilization period is extremely dependent on system specific conditions particularly the size of the system Therefore while three days of boiler operation are typically required to reach steady state no definitive guidelines can be given As a general rule if there is a downward trend in oxygen content measurements steady state condition has not yet been attained Shading is provided for the ease of reading only This Tech Sheet was developed by the members of the Heat Exchange Institute s HEI Deaerator Section HEI is a trade association comprising the leading manufacturers of heat exchange and vacuum equipment HEI Tech Sheets are information tools and should not be used as substitutes for instructions from individual manufacturers Always consult with individual manufacturers for specific instructions regarding their equipment 3 24 03 Pagelof2 This sheet is reviewed periodically and may be updated Visit www heatexchange org for the latest version M T El OnO Symptom Excessive Pressure Fluctuation a Low Outlet Temperature Tray Upsets Unexpected Storage Tank Level Excursions Water Out of Vent Ir
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