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Steam Powered Turbines Discussion of Steam Turbines on maintenance, operation, improvements, and more. Forum is open to any make and model steam turbines such as General Electric, Siemens/Westinghouse, Alstom, etc.

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  #11 (permalink)  
Old 07-10-2008
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Default RE: Low Vacuum

Load dependent high vacuum could be a bypass valve leaking or a drain leaking by. You could use a heat gun to check downstream plumbing of valves to the condenser.
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Old 12-17-2010
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Quote:
Originally Posted by insinyur View Post
based on my experience:

1. you check condenser surface area, make sure it is clean (you can do inspection for one room while the other still in service and you need to reduce load) this is if possible with your business operations

2. check for leakage around flanges, gaskets, valves etc, near ejector and condenser

3. check MP steam pressure which drives the ejector (is it according to the required pressure)??

4. check ejector drain and steam trap which send the condensate back to condenser (plug-up or not)??

5. check if someone has opened chest valve / valve after governor drain, maybe drain valve is open instead of steam trap, because condensate which goes back to condenser should pass steam trap, not through drain.

6. check your vacuum breaker is not in service

7. check level of condenser, it should be good, and check temperature of cooling water for condenser, it should be low enough to condenser steam


this is a valuable threads , at our plant I had faced such this problem , we were filling the water box with cooling water , and started the water box vacuum pump , but the level of water box didn't increase up , after searching around the condenser , we found an air leakage near the outlet flange of the water box at condenser outlet.
it could be a leakage from flanges around the condenser , or need the condenser to be cleaned again.
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Last edited by khaled hamza; 12-17-2010 at 04:52 AM.
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Old 06-03-2011
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I am building a house and considering a central vacuum system. Are they worth the cost? Any homeowners out there that have a system installed? Recommendations on Manufacturers or ones to avoid? I would install my unit in the garage and direct vent to the exterior.
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Old 12-01-2011
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Exclamation Low vaccum problem in Air cooler condenser based 150 MW power plant, INDIA

Dear Sir,

We are facing low vaccum problem in 150 MW steam turbine(495 TPH boiler coal based). and we have done Heliem leak detection test for leakage in ejector, LP turbine, ACC ducts, all air lines, condenste lines, and vaccum balancing lines but we didn't find any leakage in out whole system so please suggest us how we can achive vaccum in our system.

Thanks

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Sachin Pyasi

you may feel free to contact us
+91-9251077946
+91-8233442826
sachin.pyasi@yahoo.in
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