24 July 2003
including Change 1, Jan 2004 and Change 2, March 2005
\ Table 3-4 Inspection and Test Frequencies - Deaerators
Internal Inspection &
Every 3 years.
Tightness test every 6 years.
Every 6 years. After any
Strength test after repair or
repair or alteration of
alteration of pressure parts.
pressure parts. Inspection
Additional times at the
must include test and
discretion of the inspector.
calibration of safety valves
and pressure and
Inspection must include test
and calibration of safety
valves and pressure and
In addition to the safety inspection, the operators of the vessel should periodically examine and test
the deaerators for proper operation. Improperly operating deaerators result in excessive corrosion and
cracking. The key to satisfactory operation is proper water treatment.
Scheduling of deaerator inspection at many facilities requires scheduled downtime for many heating
and power plants. The activity should prepare to hire a company specializing in deaerator evaluations to
determine if the vessel is repairable if cracking or excessive corrosion is found during the visual inspection.
Options to lease deaerators prior to the inspection should be considered.