We do have a steam jet air ejector in service as well as our hogging jet to keep the vacuum as high as possible right now. When I got off shift the other week vacuum was fine and when I returned it started to slowly degrade. Vacuum has not changed for a couple days, but is still very low. This was also after a cycle of the unit. We vented the water box recently with no change in vacuum.

The temps going to the steam seals on the LP turbine are around 300*F and are usually at that temperature (startup is 500*F). The decay of vacuum is very gradual and bumps around the +/- 26.20" HG mark. With lower loads, the vacuum will improve by about .5"HG.

The turbine is a Westinghouse, tandem compound reaction with reheat (curtis stage in the HP as well) (HP,IP, and LP sections) rated at 145 MW. Last turbine outage to look at bearing/seals... was many a moons ago.

One last thing is that I trended the condenser circulating outlet temps for both our units which have split condensers on each. On the other unit, both outlet temps from the condenser were pretty close to each other and within reasonable range. On one of the sides of the low vacuum condendser there is about a 5-6*F difference in temperature from the other side of the condenser. Im not familiar to what should be the reasonable limit so Im not sure if tube pluggage is to blame or maybe theres air in the box.

Thanks for the help!