Re: [MW:12463] mixed feed convection coils

Dear Karandish,

Is the material 304H or 347H. I presume it should be 347H. Did you carryout any stabilisation treatment upon completion of weld? what is the metal temperature and what consumable was used for weld?

regards

vanchi

On Thu, Sep 15, 2011 at 3:15 PM, AA karandish <aa.karandish@yahoo.com> wrote:

Dear experts, In attached images you will find the failure happened on the junctions of header to heater tubes of a natural gas + steam heater. The heater specification is as follows: Inside fluid: natural gas + steam Outside fluid : flue gas from burning of natural gas in the reformer of an Ammonia plant. Tube and header material : SA-312 TP 3047H Considering the above let me have your suggestion regarding the failure reasoning.   Regards, Karandish

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