Dear Chandan,
Consumable used is right for the material specified by you. Off late we have been constructing vessels with superduplex consumables. This comes from our client requirements when the MDMT is lower as it is in your case. Just a question looking at the tube to tube sheet photograph, doesn't you/ client demand for a projection of tubes beyond the tubesheet face. I got this question since I could not see a projection. If you look, it appears that it is on the edge where the tube is supposed to end. Also if the expansion is been done after welding that could be a reason. Cracks might have already been there becoz of expansion but it increased when put in service.
Regards,
Nitin
On Wed, Aug 17, 2016 at 2:31 PM, Mehdi Vafakhah <mehdi.vafakhah@gmail.com> wrote:
Dear Chandan,--
The problem is after any service shutdown? cause (in 820 picture) it seems you have a Lon.Crack and it cant be a fabrication defect if you have used any NDT method.
Did you run any mockup test for your WPS?
A periodic welder performance test using mockup examination could be very useful.
Best Regards.
On Friday, August 12, 2016 at 11:54:28 AM UTC+4:30, chandan wrote:Dear Experts,
We are facing problem of leakage during service condition in heat exchanger. Leakage are coming in the tube to tube sheet welding in service condition. Attached are the reference photos
Details are defined below,
Construction code – ASME SEC-VIII Div-1 and Div-2
Material – Tube Sheet - SA 240 UNS 31803
Tube - SA789 UNS 31803
Filler – ER2209
Allowable Temperature – Shell – +180 / -30 C, Pressure- 1 bar /FV
Allowable Temperature- Tube- +200 /+10 C, Pressure 10 bar
MDMT -0 C
Service Media – Shell – Methanol + LIBR
Tube – Thermal oil
Let us know why such failure occurs and preventive actions
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