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Turbine shaft permanent bending...

Sunday, July 15, 2018   By: Anonymous [2257] 0 Stars
Ive noticed that every blockout of our unit, the gland steam condenser goes high. we all knew that gland steam condenser is connected to every gland of the turbine HP,IP and LP and its normal drain is connected to the condenser. shaft bending maybe caused by water ingress into the turbine. One incident or blockout happened and the rupture disc was not broken. the GSC level goes high. turbine proper drain headers temperature becomes colder. the level of the condenser goes high. the vacuum break valve was opened but im not sure if the condenser pressure goes high because the maximum can read on our transmitters is only 100.9 kPa. Is that possible that the reason of the water ingress is due to the level of condenser? Any recommendation/s on how to prevent high level of GSC whenever theres a block-out? im thinking if its possible to put a check valve between the the GSC and the condenser.

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Monday, July 16, 2018   By: anynomous [2257] 0 Stars
The check valve will prevent the backflow of water/steam from condenser onto the GSCgland steam condenser. Or is/are there any valve or instrument that will prevent the backflow?

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Thursday, July 19, 2018   By: Jim Watts [764] 5 Stars
It is very unlikely the GSC will fill from the condenser as the condenser would need to be up to the level of the turbine shaft.
If you are getting water into the turbine glands it is most probable coming from the steam to glands system. When the turbine is operating the HP gland leakage supplies the gland steam header and the startup gland steam supply is no longer used. This gives the possibility this line will cool and fill with water if it has faulty steam traps. When the turbine trips the gland steam tries to come from the startup header and if it is water you will cool the bottom of the turbine and fill the gland steam condenser till it runs steam again.

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Published on steamforum.com


High Sulfite Residual
By: Ross. [390]

First, I want to say that large amounts of Sodium Sulfite NaSO3 becomes a contaminate because it will produce foaming and other problems, but foaming is the primary problem.

Your 500-psi Water Tube Boiler is seems to have reasonable level of residual Sodium Sulfite NaSO3 remaining in the boiler water. Nice pH too.

Your 300-psi Waste Heat Recovery Boiler has twice what I would expect for Sodium Sulfite NaSO3 at ranging 80-ppm to 100-ppm. pH is good so you are getting a good yield.

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