*For original article with graphics click the PDF link attached below.
Recently a customer was having a significant leak in the hood bellows and needed an on-line fix in order to make it to their scheduled outage for the following month.
Brain-storming with the Oakridge Bellows engineering group a temporary fix was put in place that got them to their outage.
Rolled angle with rope and caulking to seal the gap
The system, operating under a vacuum, will pull down on the rolled angle once the gap is sealed with ceramic rope and high temperature caulk.
The customer was able to maintain a stronger system vacuum than other attempted methods such as stuffing fire-blanket and sealing putty in the cavity.
This repair needs to be done while the system is hot so that there is no significant thermal growth movement; which will break the seal.
How this fix would look on a standard GE hood bellows
The Oakridge Bellows team was able to supply a new condenser seal/ hood bellows assembly in time for the outage.
Oakridge Bellows has the tooling to duplicate the most common OEM condenser seals, such as GE and Westinghouse.*
To avoid steam turbine efficiency losses, add the condenser bellows seal to routine inspection, and change this part out per the OEM recommendations – usually at 25 years.
*Oakridge Bellows is not associated with GE or Westinghouse