Re: [MW:34096] Forming marks on Dish End of pressure vessel

Ameer Basha,

In my entire experience of the pressure vessel manufacturing industry and being a Sr.Design Engineer as well, I never ever witnessed such a strange bulge on any head.

Seems It's straight away not ACCEPTABLE. 

However, further I am not aware about the vessel design conditions but yes if external pressure is present for this vessel then AI always ask to check and witness the head curvature with allowable maximum deviation & chord length. (Attached below reference image from my one of the project)

On top of it, even we as EPC contractors always ask vendors to submit their "Head forming procedure" to understand whether they are going to form the head by HOT or Cold way. There are few vendors who follow the COLD forming way & also it depends on thickness but never ever saw such visible bulge on it. 

Further check of Head forming also takes place in ITP e.g. If Extreme fiber elongation exceeds then, Heat treatment, PWHT involve and production test coupon, plates MTC & traceability etc.

Inspection point of view, Vendor QC Inspector, END user TPIA and ASME Inspector always have HOLD point in ITP to check and witness each stage wise activity. 

You need to dig a little more for case history and check in the inspection report and parallel with the Design Engineer to know the permissible curvature range and re-check from your end physical for your satisfaction and decision.

Regards,

Mudasar

On Thu, Mar 23, 2023 at 6:56 AM <ameerbashasheikh@gmail.com> wrote:

Hi, 

One of our pressure vessel manufacturer recently supplied Oil and Gas separator having distinct forming marks on dish ends. Supplier claims that those marks are aesthetic and do not hamper vessel performance. Photo is attached herewith. 

Being the end user we are not in position to make final decision whether to accept the pressure vessel with distinct marks on dish ends and put under operation or not. The pressure vessel is designed as per ASME sec VIII Div I and vessel is U Stamped. The vessel is hydro tested and holds good. ASME inspector has not commented anything on forming marks or pressing marks in their release note. 

Please guide should we accept it or to ask supplier to rectify the same or any section of ASME code confirms non acceptance of same in pressure vessel. 

Regards, 

Ameer Basha 

Sent from my iPhone

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