Re: [MW:12470] mixed feed convection coils

It looks like this failure is HAZ and this mettalurgical failure is due to increase in material hardness due to welding ; this failure looks like this is happened in service ; normaly these type of defect comes in service when these section subject to pressure. since this failure is on SS 312 - 304H which require to be analyzed ; i will suggest you to measure teh hardness value of this material near to crack area and also to measure one reading at 100mm from

On 16 September 2011 08:42, <snbagchi@aol.in> wrote:

Dear  Mr. Karandish,

 

The crack appears to be over the entire weld, and obviously, the welding process needs to be corrected. I feel that this requires a thourough

investigation at the site and metallurgical evaluation and testing if we need to correct this problem. I am a Metallurgy/ welding consultant ( IIT Kharagpur, Metallurgy, 43 years experience) with experience in welding of S.S., P91 steel, etc. I am willing to take up this problem.

 

S.N.Bagchi.

-----Original Message-----
From: AA karandish <aa.karandish@yahoo.com>
To: material & welding <materials-welding@googlegroups.com>

Sent: Thu, 15 Sep 2011 5:09 pm
Subject: [MW:12461] mixed feed convection coils

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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