RE: Atención valide origen![MW:30159] Fwd: Nozzle crack propagation

Hello

Initially, in my opinion there is not SS flange, but you can check, by using the devise for that.

This corrosion evidence indicate that the material isn´t SS.

According to the picture, the crack is far away from the weld. We can suppose that that the failure in not associated to the welding process, but the material quality.

                                                                                                                                                                                               

 

Hernán Castillo Mier

Ingeniero Senior Confiabilidad e Integridad

FACILITADOR AUTORIDAD TÉCNICA EQUIPO ESTÁTICO

INSPECTOR AUTORIZADO

API 510 (33119)

Avantel: 8*1571

Teléfono: 668-2396

 

De: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] En nombre de Chiranjeevi A
Enviado el: miércoles, 16 de octubre de 2019 3:32 PM
Para: materials-welding@googlegroups.com
Asunto: Atención valide origen![MW:30153] Fwd: Nozzle crack propagation

 

 

Dear All,

   Please find the attached snap, we found a crack circumferentially. The nozzle size is 6" and the material is SS.

 

  The following plant is under construction and the vessel erected around 1yr back. There is an argument that because of pipe loads that are not supported yet, it created tension and lead to crack.  Even I surprised that how a steel material started cracked like brittle for just for a few external loads. (This not the correct reason)

 

I clearly explained that any steel material that we design to be below the yield value. When the load beyond the ultimate limit it leads to fatigue and finally crack. This situation we can expect in operation if there is cyclic loading and the connected piping not supported properly. (which is an impossible situation).

 

 Finally, I suspect that 

 - the material of the nozzle is not SS. (Maybe zinc coated)

- (or) Because of  corrosion

- 

(or) during welding, it created a weaker section and started crack initiation for the external loads.

 

Experts kindly share your opinion and suggestions.

 

Thanks & Regards

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