tubesheet to shell butt weld joint radiography
tubesheet to shell butt weld joint radiography
(OP)
Dear Experts
We ordered one Double tubesheet exchanger to vendor. Both Tubesheets are welded to shell with Butt weld as per FIG UW-13.3.
Now as per vendor he cannot perform Radiography on this weld due to Tube hindrance and cannot perform UT due to 10 mm joint thickness.
he is suggesting PT.
What is your opinion pl
We ordered one Double tubesheet exchanger to vendor. Both Tubesheets are welded to shell with Butt weld as per FIG UW-13.3.
Now as per vendor he cannot perform Radiography on this weld due to Tube hindrance and cannot perform UT due to 10 mm joint thickness.
he is suggesting PT.
What is your opinion pl





RE: tubesheet to shell butt weld joint radiography
RE: tubesheet to shell butt weld joint radiography
You can do UT during fabrication and in-service inspection
http://www.bindt.org/downloads/NDT2012_1A2.pdf
Regards
r6155
RE: tubesheet to shell butt weld joint radiography
Is this normal to weld all these tubesheets to shell on both side and then insert tubes one by one ?
there is no clear view how tube is travelling inside tubesheet until tit comes out from other side tubesheet
RE: tubesheet to shell butt weld joint radiography
RE: tubesheet to shell butt weld joint radiography
Thanks for your response, can you guide for code exemption if the exchanger is in Lethal service ? thanks in advance
RE: tubesheet to shell butt weld joint radiography
Why didn't you mention it before? (lethal service).
Another important data is comming from you?
Regards
r6155
RE: tubesheet to shell butt weld joint radiography
Sorry for late info, can you suggest any code exemption or provision of code cases or nay practical way of performing RT. Appreciated your time.
RE: tubesheet to shell butt weld joint radiography
As an alternative to the radiographic examination all welds in material 1/4 in. (6 mm)and greater in thickness may be examined using the ultrasonic(UT) method per the requirements of 7.5.5 of Section VIII, Division 2. Which is automatic or semi automatic recordable UT examination.
2017 edition words are different but intention is same (it refers to UW-53b that cross refers to 7.5.5 of VIII-2)
This method is acceptable for Lethal Service.
Probably TOFD and Phased Array combination will work. Talk to automated UT expert.
RE: tubesheet to shell butt weld joint radiography
Thanks for your valuable input. It really helps.
So does it means all Tubesheet hub type connections with Shell in Lethal will be UT performed due to Tube Hindrance ? UW-2(a)(2&3) provides some waiver on inside Tube Butt joints and consider this is not possible to perform RT, then Why this Tubesheet to Shell Butt joint is also not included in this list of waiver. Just as thought to share.
RE: tubesheet to shell butt weld joint radiography
For your joint type, RT would be required (or UT per rules of ASME).
Cheers,
RE: tubesheet to shell butt weld joint radiography
What is your opinon to perform RT on these joints, will you put all tubes after RT of Tubesheet to Shell weld ? is it Practical and normal to pass tubes after welding Tubesheet to shell from both ends ?
RE: tubesheet to shell butt weld joint radiography
Regards
r6155