There are various reasons for retrofitting or replacing an existing deaerator/feedwater vessel with a Stork spray type deaerator
- Plant capacity changed or will change (increased or decreased flow)
- Integrity issues with the existing feed water plant exist
- Increased plant efficiency is of importance
- Reduce operational cost is of importance
- Other reasons – please advise
Please click here for an example of a reference project which Stork executed on EPC basis.
Replacing the complete vessel
If the existing vessel is old or in bad condition, it is often recommended to replace the complete vessel. When replacing a conventional type deaerator with a Stork spray type deaerator, Stork will design a new vessel which fits the existing support structure. Also the required hold-up time and existing connection will be taken into account in the design.
Eliminating the dome, it’s access platform, scavenger dosing unit, vent condenser and instrumentation often results in a simpler installation when replacing with a Stork deaerator. This increases safety and reduces maintenance.
The movie below shows the replacement of a Stork deaerator which has been in operation for 85 years. This deaerator was supplied by Stork in 1932 it has operated to the full satisfaction of the customer all of these years.
Retrofitting a tray type with a Stork spray type
If the existing feedwater tank is still in good condition, it can be retrofitted to a Stork spray type deaerator. This is a fairly easy and cost effective exercise.
A typical scope for a retrofit comprises
- removing the internals in the feedwater tank
- Isolating or removing the deaerator dome
- Installing new internals (sprayer, sparger baffle plates)
Stork always aims to re-use as many nozzles as possible to reduce welding on the vessel.
Stork can either perform this retrofit on a turnkey base or provide the engineering and sprayer.
Please consult Stork for more information.