UT scan or RT on Duplex stainless steel
UT scan or RT on Duplex stainless steel
(OP)
Friends, I'm not expert in NDT techniques & I would think can find NDT specialists here who can advice on best methods to check wall thickness of SS/DSS pipe materials. As DSS materials could be more susceptible to weld root corrosion, can radiography be applied to initially check before we go for more advanced techniques...
Thanks in advance for ur help...
Thanks in advance for ur help...





RE: UT scan or RT on Duplex stainless steel
Steve Jones
Materials & Corrosion Engineer
http://www.pdo.co.om/pdo/
RE: UT scan or RT on Duplex stainless steel
I agree with Steve, if you are ahving weld root issues in duplex either the welding practice was very messed up or you simply have the wrong material.
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RE: UT scan or RT on Duplex stainless steel
For wall thickness readings of pipe call in an experienced NDT outfit and have them perform UT thickness measurements in suspect locations (bends, elbows, tees etc. This can be done very precisely (+/- 0,1mm).
For your pipe-to-pipe welds you can still use UT but you might need to grind flats on the weld cap directly over the root(or better, grind the whole cap flat) as an aid to effective coupling. Your NDT people should be able to accurate results.
For small diameter pipes (6" OD max) a pair of RT elliptical shot will give you a good visual image of the weld root condition. Again call in an experienced NDT ooutfit to meet your requirements.
Cheers
Nigel Armstrong
Karachaganak Petroleum
Kazakhstan