[MW:25266] Re: Problem in welding tube to tube sheet welding

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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