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RE: [MW:25255] Problem in welding tube to tube sheet welding

By Materials & Welding

Dear Chandan Sharma,

The leaks in your tube bundle appears to be from the cracks in the Tube/Tube sheet welds. Please look at your fabrication details for the tube bundle. The cracking could be caused by the expansion of the tubes while in service.  

A thorough investigation into the Manufacturing process will be needed before attempting a repair procedure.

Regards

George V Aliyattukudy

 

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of chandan sharma
Sent: Friday, August 12, 2016 11:18 AM
To: materials-welding@googlegroups.com
Subject: [MW:25245] Problem in welding tube to tube sheet welding

 

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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