I see that on thread 794-330216 davefitz was involved in replacing a dissimilar material weld for Alstom's HP OTC with flanges. I have been asked to look at the same issue. Has a solution been found?
Thanks,
Jack
Correlating a diaphragm area check to a component of rotating bucket stimulus will be very inexact. The area check should be done at the throat of the partitions and it is the trailing edge geometry that will have a greater effect. That being said, I have seen large (greater than 50%) variations...
Thanks all. Here is a brief update of the situation.
The deposits were mostly copper but with bands of iron (condenser is AL-6X and FWHs are Cu-Ni and Monel). Deposits were mechanically removed. Condenser, FWHs, superheater and piping insected for unanticipated material loss (none identified)...
Thanks poetix,
We did think of that and just had a degauss firm in. They indicated that the level of residual magnetism was what they would expect after degaussing. I appreciate the thought and any other guesses that might be out there.
Thanks for the information. We don't see much evidence of hard particle erosion (still have sharp trailing edges and no blunting of leading edge). Our monitoring of steam chemistry has shown less than 1 ppb iron but maybe that is still too high, or maybe the sample is not representative of the...
Description of Unit.
The machine is a base loaded 250 MW 2400/1000/1000 unit with a GE turbine and a CE boiler. Water chemistry consist of Equilibrium Phosphate Treatment and conforms with EPRI recommended guidelines.
Problem:
Prior to the current outage the unit was suffering a 20 MW load...
Description of Unit.
The machine is a base loaded 250 MW 2400/1000/1000 unit with a GE turbine and a CE boiler. Water chemistry consist of Equilibrium Phosphate Treatment and conforms with EPRI recommended guidelines.
Problem:
Prior to the current outage the unit was suffering a 20 MW load...
I'm trying to get a handle on the installed cost of a package boiler with the following specs:
output 150,000 lb/hr
Pres 200psig
temp 600F
fuel no 2 oil/gas
low NOx firing system.
I know it is a real guess but I want to know if it is $5, $20 or $50 million dollars.
Any help would be appreciated.
Generator is a 170 MVA, GE, 3600 RPM machine commissioned in 1957. Retorqued Generator Core Compression Flange Nuts in 2000. Generator lead box recently opened and a nut with a piece of the stud was found. End bells off and one of the 24 keybar nuts is gone!
Is there any similar condition that...
The fan is a constant volume device and the cooling is a function of the mass of the cooling fluid. If you suck then you are putting hotter air through the fan and there will be less mass to move the heat. This means blowing is better.
What you are seeing is a reduction in effective heat transfer surface as air is blanketing the air removal zone of the condenser. Subcooling occurs as condensate drips over tubes colder than the saturation temperature as it falls to the hotwell. With the higher back pressure caused by air...
I'm looking for a rational explanation of the orifice sizing for the operating vent of feedwater heaters. I have seen sizing criteria stated as 0.5 to 1.5 % of extraction steam flow but I don't know where it comes from. HEI doesn't have a criteria that I could find.
Vent the tank through a carbon filter. You will probably need a vent fan. The system can be designed for a variety of operating conditions from tank breathing to tank filling. Be aware that teh tank is probably not designed for any vacuum so flow control of the larger systems can be complecated.
