qualifying tube to tube sheet welds
qualifying tube to tube sheet welds
(OP)
What tests need to be done when qualifying tube to tube sheet welds? I only know of the penetrant testing, leak path and 10X crack investigation, according to div II. Is there any shear test, push out or pullout tests required. Where can I read more about these?
Thank you
Joe
Thank you
Joe





RE: qualifying tube to tube sheet welds
Welding of tube to tubesheets is commonly referred to as "seal welding". Seal welds are not considered as strength welds......tubes are still expansion rolled into the tubesheet
Seal welds are commonly made to remove a crevice in the heat exchanger.... a site of corrosion.
As I recall, tube attachment to the tubesheet is typically "pullout tested" as described in the TEMA standards. This destructive test is performed on a group of representative tubes rolled into a sample section of tubesheet.
http://www.tema.org/highlig8.html
MJC
RE: qualifying tube to tube sheet welds
RE: qualifying tube to tube sheet welds
more info on www.eemua.co.uk
best regards
RE: qualifying tube to tube sheet welds
ypically a T to T/sht weld can be a seal weld if the expansion of tubes into grooves in t/sht is giving the strength. However it is possible to use welding for strength and expansion of tubes for strength as well and in rare cases both expansion and welding contributing to strength. Refer Appendix (non mandatory in Sec VIII Div 1 especially for calculating fr...I don't remember which appendix|)
For tests on t to t/sht welds, refer OCMA, EIL and/or TEMA for other tests. Some specs also call for sectioning a slice and carrying out radiography in addition to tear tests and pull out tests. I had presented a paper on types of tests available for t to t/sht welds but do not know how to append the same here
Thanks and regards
Sayee Prasad R CEng MWeldI MIOMMM
If it moves, train it...if it doesn't move, calibrate it...if it isn't written down, it never happened!
RE: qualifying tube to tube sheet welds
The design of the weld is critical of the Code construction
you have to choose the design and comply with fillet, groove and size of the weld metal, joint desing.
ER