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I think UT inspector will be able to judge accurately whether it is fake signal or not.

PWHT is not necessary because Carbon Steel doesn't contact with an amine service. However you should consider using 316ss lining in chloride SCC environment.

You can’t avoid galvanic corrosion at carbon steel pipes connected SS pipes in the water service. Periodically, inspection should be needed to check thickness of carbon steel pipes nearby Stainless steel flange. Others also might have corrosion over long time within a natural environment.

No problem to use becaude bolts were already tightened and it's ok for you to repaint during next shut down time.

Flattening test gives a good evaluation of the weld area ductility and can occasionally alert you to the presence of bond line defects so seamless carbon steel pipe,A106,doesn't need to be tested.

No need to PWHT because the thickness of C.S is below 19mm.

PWHT needs are determined by the nominal thickness so the material should be PWHT.

You can easily check and jurge weld seam conditions with RT.

Because they didn't change conditions, you should select the same material as inlet.

Dear metenger, This information "the titanium content shall be not less than four times the carbon content and not more than 0.7%"is written in the SA312-304 what i want to know is the reason for limiting max Titanium 0.7% content. Thanks

Hi all, What is the reason for limiting max titanium composition in the 321SS?

if you use an infrared camera , you can find the bulged area.

lganga, I should like to know the more recommended NDT for detecting defects in the TTS joint. Eddy current can detect defects like cracks in the expanded area with grooves? ---> can detect defect on tube inside.(non ferrous material) Is IRIS able to detect defects in that critical area of...

There is no standard of rejection percentage for field joints but 5~7% is too high. We usually try to manage below 2%.

It's better to do hydro-test for main and branch pipes .

Yes. you can find galvanic series in seawater at internet. http://www.corrosionist.com/Galvanic_Series_of_Metal_in_Seawater.htm

I'd like to recommednd ECT or sample. Sample is best way to check the microstrcture.

Metenger, Thank you so much

RT is supplementary requirement. If you see the code(SA216,SA217,SA351),you can understandard.

If you want to know the thickness of tubes made of A179 IRIS is better than ECT.