Dear sir,I may feel crack due to 馃敤 hammer or I. Proper handling & propagate after heat.RegardsDinesh--On Fri, Oct 18, 2019, 08:54 Hernan Arturo Castillo Mier <Hernan.Castillo@ecopetrol.com.co> wrote:--Este mensaje puede contener informaci贸n de tipo personal, clasificada o reservada; si usted no es el destinario, por favor, hacer caso omiso de su contenido y abstenerse de compartirlo, reenviarlo o copiarlo. Si recibe este mensaje por error, agradecemos informarlo inmediatamente al remitente y borrarlo permanentemente de su cuenta. Si usted est谩 autorizado para recibir la informaci贸n de tipo personal, se le recuerda que esta informaci贸n debe ser manejada con la finalidad con la que ha sido solicitada y en virtud de la normativa que habilita el acceso a la misma. As铆 mismo, deber谩 ser usada bajo los par谩metros de la ley 1581 de 2012 de protecci贸n de datos personales y la normativa que la desarrolla, siendo responsabilidad del 谩rea receptora del cumplimiento de la citada normativa de protecci贸n de datos personales. CONFIDENTIALITY NOTICE: This electronic transmission (including any files attached hereto) (this "Communication") contains information that is or may be legally privileged, confidential, and exempt from disclosure without our express permission in advance. The information is intended only for the use of the individual or entity named above. If the reader of this message is not the intended recipient or any employee or agent responsible for delivering the message to the intended recipient, you are hereby notified that any disclosure, dissemination, copying, distribution, or the taking of any action in reliance on the contents of this electronic Communication is strictly prohibited. If you have received this Communication in error, please notify the sender immediately and destroy permanently the transmitted information in its entirety and do not disclose its contents to any other person. Para conocer la Declaraci贸n de Tratamiento de Datos Personales de Ecopetrol, favor consultarla en www.ecopetrol.com.co Responsabilidad Corporativa – Declaraci贸n de Tratamiento de Datos Personales.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.
Hern谩n Castillo Mier
Ingeniero Senior Confiabilidad e Integridad
FACILITADOR AUTORIDAD T脡CNICA EQUIPO EST脕TICO
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De: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] En nombre de Chiranjeevi A
Enviado el: mi茅rcoles, 16 de octubre de 2019 3:32 PM
Para: materials-welding@googlegroups.com
Asunto: Atenci贸n 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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