Re: [MW:34103] Forming marks on Dish End of pressure vessel

Good day friends. The marks are uniform derived from forming process. If material is fatigue prone this can prove dangerous. An Ultrasonic examination can be done on visually predominant marks to find any discontinuities. Hydro test is good. Crack propagation point of view need to be analysed for useful time.

Mohan Ananthanarayanan

Retd QA Mechanical ISRO

On Fri, Mar 24, 2023 at 8:30 AM 'james gerald' via Materials & Welding <materials-welding@googlegroups.com> wrote:

just to add.

1. Minimum and maximum thickness to be checked and verified with Design requirement for both vessel subjected to External pressure and Internal Pressure.

2. According to ASME Sec.VIII Div.I, there is no surface roughness requirement for UCS section except for UCI & UCD.  ( Believe this is carbonm steel vessel DE made of SA105 or SA350LF2 and is paintedmcorrect me if I am wrong).

3. According to ASME Sec.IIA, there is no surface requirements for SA 105 or SA 350LF2, except for SA 182 forgings as per snap shot below.

Please consult your AI for further requirements.

Thanks & Regards

J.Gerald Jayakumar

On Thursday, 23 March, 2023 at 01:18:48 pm IST, 'james gerald' via Materials & Welding <materials-welding@googlegroups.com> wrote:

Perform a thickness check and verify it meets design requirement and consult AI

Sent from Yahoo Mail on Android

On Thu, 23 Mar 2023 at 9:26, ameerbashasheikh@gmail.com

<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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