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Preservation of Steam Condenser

Tuesday, December 13, 2016   By: M Naqash [2007] 0 Stars
We have spring mounted condenser installed 15 MW condensing turbine, our plant will be out of service for next complete year. I need recomendation for preservation of turbine and condenser perticularly on following points:

1. is there any need to fill condenser with water ?
2. is there any need to fix foundation springs ?



Regards,

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Tuesday, December 13, 2016   By: cmolanes@itba.edu.ar [50] 4 Stars
Mr. Naqash:

Perhaps there are local regulations or manufacturer instructions to be followed.
Ignorant of any of these I would think in draining thoroughly an filling up with nitrogen. This technique has been used in naval preservation of decommisioned ships protecting all sort of pipings and pieces of equipment.

Using water may give an extra weight and load on supports I suppose, since there is much volume normally filled with steam, so a gas and lightweight.

Claudio Molanes

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Thursday, December 15, 2016   By: Jim Watts [764] 5 Stars
putting jacks in the condenser springs is required if the condenser is to be filled with water. This is usually only carried out to check for tube leaks using dye in the water and the waterboxes open.
Filling with water is a very bad option for storage.
Most comnonly the turbine glands are sealed with silicon tape or packing and the condenser is kept under nitrogen blanket or dry instrument air. It is important that no water is left anywhere in the turbine or valves as it WILL corrode. Drying with air then nitrogen blanket is the preferred.

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Friday, December 16, 2016   By: Ross Burns [390] 5 Stars
The answers you got above were excellent and to the point. So, being dry is very important. My modest experience in assessing steam turbine condensers after a long lay-up, like what you are suggesting, may be extended a year later, so those important preventative measures of the above posts point this out.

The coolant or cooling water side of the condenser seems to get neglected or just not paid as much attention to as the steam condensate side of the condenser. What comes to mind is micro biological corrosion, for the tubes may appear to be dry but in reality they can sag and puddle trapped cooling water even though the water boxes are drained and open, and if there can be bugs or biological mater that eat away at the tube material or selective metal corrosion, but that depends on the tube material alloys.

Therefore, I would think the best preventive measure for the steam condenser coolant side is to drain, and clean the inside surfaces of the tubes and then using compressed air blow each tube clear of standing water. Then leave the water box covers off since the big shut off valves are not completely water tight since they can still pass a small amount of water through but hardly noticable.

Keep an eye-on or watch the water boxes for corrosion because they tend to be made of carbon steel and will corrode.

Ross

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