[Rishi Velkar]

•What wind effect mitigation methods have you found to be most effective? E.g. vertical wind screens, solid walls, horizontal skirts, louvers to direct flow to fan inlet etc.
•Have you used water spray system in steam turbine exhaust to condense steam prior to ACC and reduce load on the ACC? If yes, can you quantify effectiveness of such system in reducing ACC load?
•Can you share any useful study results on various mitigation methods and their effectiveness?
•Can you recommend some best engineering firms that can perform a study (filed testing/CFD etc) of effectiveness of different wind effect mitigation methods at a given plant?

[Rishi Velkar]

Thanks for the response Vahid.

With IR how do you find the source of the leak , would you see a significant temperature difference on the pipe where the leak is at?

[Rishi Velkar]

Hello all,

We are having the same back pressure issue and are not able to find the leak. We have to start the hogger every two hours. We had CONCO (leak detection company) out 4 times so far yet had no success in locating the leak.

The main problem is that even an artificial leak is created by opening a valve and spraying Helium over it is not being detected properly at the air ejector. The test shot takes about 2 mins to be detected a the air ejector further more it is very weak. Has anyone faced this issue before where you were not able to detect even the test leak?

We checked the air ejector nozzles, the valves and the drains , everything is in good working condition. It just seems as though the helium gets diluted in the ACC since the leak is big. The hogger brings the DO from 700ppb to 200ppb for about thirty minutes and gradually goes back up.

We have tested the Steam gland seals, drain tanks, by pass valves, DA/condensate tank and air hogger/ejector skid and haven’t had any luck but doing testing without getting a good hit on the on the test leak is futile.

Anyone have any ideas or suggestions as to why we wouldn’t be able to get a good hit on the test shot? Can the Air leak dilute the Helium ?

• This reply was modified 7 years, 5 months ago by Rishi Velkar.

[Rishi Velkar]

Hi Huub,
We are having the same issue where are the bellows located ? are you talking about the bellows located on the exhaust duct inlet headers going into the ACC ?

Thanks
Rishi

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