Peter--man
Mechanical
- May 11, 2017
- 1
Dear all
We are having some troubles qualifying a Tube/Tubesheet PQR acc. to ASME IX and EN ISO 15614-8; more specifically the min. Leak Path.
I know ASME VIII Div.1 has no special rules for it, but EN ISO 15614-8 does.
We have tried many ways to weld the tube/tubesheet connection (ø Fillermetal, amps, weld speed, joint design…) but for some reason when we check the macroscopic test, +/-50% of the welds do not meet the requirements of the min. leak path (for EN ISO this should be min. 0.9 tube THK).
Important: we do the welds manually, first layer without filler metal, second layer with filler metal.
Are there special joint designs that can guarantee a sufficient weld? Or other tips/tricks?
Thanks in advance!
Regards,
PeterMan
We are having some troubles qualifying a Tube/Tubesheet PQR acc. to ASME IX and EN ISO 15614-8; more specifically the min. Leak Path.
I know ASME VIII Div.1 has no special rules for it, but EN ISO 15614-8 does.
We have tried many ways to weld the tube/tubesheet connection (ø Fillermetal, amps, weld speed, joint design…) but for some reason when we check the macroscopic test, +/-50% of the welds do not meet the requirements of the min. leak path (for EN ISO this should be min. 0.9 tube THK).
Important: we do the welds manually, first layer without filler metal, second layer with filler metal.
Are there special joint designs that can guarantee a sufficient weld? Or other tips/tricks?
Thanks in advance!
Regards,
PeterMan
