Kestas
Staff member
Have you removed the source of corrosion? If this isn't addressed, the problem will continue. Or perhaps you've simply decided to live with it.
Joys of being an engineer
- Thread starter Shannow
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JTK,
here's a link to one in South Africa.
http://www.massengineers.com/generator_accident_in_africa.htm
Instead of throwing a 14" blade, it threw a handful of last stage blades (33.5" long, weighing about 40lb each). Advice from a design engineer is that there's around 200 tonnes of imbalance with the loss of one, not a handful.
It pulled the shaft so violently that it broke the bearing keep. Generator shaft then failed, releasing the hydrogen (the big generators are all filled with hydrogen at 45-60psi for cooling and reduced windage).
Big Bang...if you look at photo 6, you can see where the generator shaft snapped, with the conductor bars running up the middle. Photo 11 is the turbine to generator coupling.
here's a link to one in South Africa.
http://www.massengineers.com/generator_accident_in_africa.htm
Instead of throwing a 14" blade, it threw a handful of last stage blades (33.5" long, weighing about 40lb each). Advice from a design engineer is that there's around 200 tonnes of imbalance with the loss of one, not a handful.
It pulled the shaft so violently that it broke the bearing keep. Generator shaft then failed, releasing the hydrogen (the big generators are all filled with hydrogen at 45-60psi for cooling and reduced windage).
Big Bang...if you look at photo 6, you can see where the generator shaft snapped, with the conductor bars running up the middle. Photo 11 is the turbine to generator coupling.
JTK
$100 Site Donor 2025
Jeezuz.. I've seen the aftermath of some hydrogen compressor and oxygen comressor fires, but nothing quite that bad! Glad not to be on shift that day/night.
That made a noise.
Don't know anything about the turbine except it looks expensive.
Don't know anything about the turbine except it looks expensive.
My repairs were in the hundreds of thousands.
The S.A. repairs I have no idea. However following that, our insurer is recommending that we cut oil to a burning turbine, even if it IS at 3,000RPM. Apparently the direct damage to the machine from a dry rundown is way less that the B.I. losses when a burning turbine destroys the overhead crane that is going to be used to pull it apart and fix it.
We've cut whole rows of blades off and returned to generation at reduced load/efficiency because parts are some way off.
The S.A. repairs I have no idea. However following that, our insurer is recommending that we cut oil to a burning turbine, even if it IS at 3,000RPM. Apparently the direct damage to the machine from a dry rundown is way less that the B.I. losses when a burning turbine destroys the overhead crane that is going to be used to pull it apart and fix it.
We've cut whole rows of blades off and returned to generation at reduced load/efficiency because parts are some way off.
is there somekind of a lifecycle of the unit?
We had a kid in the Navy decide he didn't want to go on deployment to he stuck a wrench in the reduction gears. What a mess! They came and got him and we never saw him again.
I used to love to be throttleman during engineroom drills. It's really a rush to hear those turbines wind up an realize you're the one making it happen.
I used to love to be throttleman during engineroom drills. It's really a rush to hear those turbines wind up an realize you're the one making it happen.
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