Crack in vessel due to over pressure

[Muhammed Ibrahim PK]

Gents, 

Is there any option to find out if the vessel is cracked because of over pressure at site by mistake. 

If we perform a tensile test across the crack area, can we get any clue if grains are already permament deformed due to over pressure? 

Or is there any other metallogaraphic method can we employ? 

Reg, 

Ibrahim

[Customer Care]

Hi Muhammed.

Before implementing a crack evaluation FFS, you could first rule out its presence using WFMP (wet flourescent magnetic particles). This test is foolproof for surface and subsurface cracks. Complement the evaluation using UT.

This could be an orientation on PV overpressure cracks.

Regards, 

Ramon Briceno

Enviado desde mi smartphone Samsung Galaxy.

-------- Mensaje original --------

De: Muhammed Ibrahim PK <ibra...@gmail.com>

Fecha: 2020/10/27 7:45 AM (GMT-04:00)

A: material...@googlegroups.com

Asunto: [MW:31622] Crack in vessel due to over pressure

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[anthony chundal]

Hi,

Design calculations will let you know if it is due to over pressure,

Regards 

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[Ramin Kondori]

Dear Muhammed,

If the welding has done correctly, the overpressure failure usually occurs after plastic deformation and it would be more or less obvious.

The appearance of the crack could give you a lot of clues...

Please provide us with a few high-resolution pictures of the vessel, the crack area and the crack itself...

Regards

Ramin  Kondori

Sr. QA/QC & Welding Engineer

-----------------------------------------------------------

PG-Dip. in Welding Engineering (IWE  AT  0070)

BSc. in Civil Engineering (IUT)

BGAS Painting Inspector

ASNT Level I&II

                        

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[George Dilintas]

What are you looking for?

Crack?

Plastic deformation?

if you look for a surface microcrack (not leaking crack) then FPT is fine. However, this will take a lot of time since you have to do it in the whole surface of the vessel and you have to do it during the night.

If you worry for a plastic deformation, the best way is to do a finite element calculation in order to check if stresses over the yield point have been developed.

For an non destructive methode read this article https://www.ndt.net/article/ndtp2017/papers/Zavadil2.pdf.

All other methods are destructive. The best to do is the finite element calculation with a fine mesh in the areas of stress concentration 

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Dr. Georgios Dilintas,

Dipl. Ing. In Aeronautic and Space Engineering

Ph.D in Mechanics of Solids - Computational Mechanics

A.I.S, A.N.I, IRCA Lead Auditor

Welding, Stress Analysis, Corrosion, QA/QC, Failure Analysis, Risk Analysis