How Many Online Methods to Detect Tubes Leakge in Condenser?

Isolate the steam side, open-up and and inspect the tube headers with the water side under pressure. Whichever tube is leaking will show up as water pi$$ing out of it.

This thing is on planned-preventative maintenance for periodic tube replacement as required by the Engineer/Surveyor for the company providing burst indemnity insurance, isn't it? It does have a written scheme for periodic inspection, doesn't it? _{Do say "yes" to both questions....}

this is good method for preventative but i need online method in normal operation.

1.-Eddy Current Testing (ECT)

2.-Ultrasonic IRIS

ECT has high detectibility for all Non- ferromagnetic materials. This Include ss, Titanium alloys, Hastelloy, Brass.... ECT detected around 90% of the defects in ss while IRIS only detected around 25% of the defects. But IRIS has higher detectibility for ferromagnetic materials such as cs and low alloys. Iris detected 80% of the defects while ECT detected 65% of the defects.

Regards WP

ECT and IRIS are good methods.please tell me more methods.

1,- Full Saturation Eddy Current

2.- Partial saturation Eddy Current

3.-Magnetic Flux Leakage

4.-Laser optics

5.- UT IRIS

6.- ?????????

WP

ECT and IRIS are good methods, but it's not on-line method you want. ECT I got it done for some coolers, it's a method to measure remaining tube thickness and compare with original, so that failure could be predicted in advance. It is done off line, because a probe has to be inserted one by one in each tube after thorough cleaning.

Also, it seems you have not defined your problem properly and discussions went off-line to detect which tube has failed? I think you wanted to know that tube of which chamber (out of four) got ruptured, while in operation? Am I right?

"Which tube is in rapture? "

Why, the one that is being captured up into heaven, of course....

http://www.ndtsystems.com/

You can obtain a set of books (Leak Testing) published by the American Society for Nondestructive Testing. These books describe the various methods in detail.

I've worked with a number of power plants using helium leak detection to isolate leaks. However, your schematics are not clear enough on the site for me to understand what you are trying to do. Do you have more detailed pictures you can post?

The method mentioned by jsmclaren (helium) is used in a vacuum system to locate leaks. The method involves sensing the gases at the air ejector vent, the helium is injected at a known area and sampled almost instantly.

I don't know if it would work in your application, there are a lot of vendors out there check with one. It is simplistic and effective for normal vacuum leak problems.