Re: [MW:19339] Corrosion on Stainless Steel Vessel Weld

Dear Raju,

Can you send photo of the crack?
Did you do internal inspection? If not or vessel in service and internal inspection is not possible, so do UT to check the depth of the crack and the thickness at that location.

Regards

On Nov 22, 2013 2:31 PM, "kalidindi raju" <eswar.iitb@gmail.com> wrote:

Dear All,

 

What is the probability that the cracking has occurred ID to OD...ie through wall?

The presence of the crack indications at each of the stained location corroborates the assumption.

 

The vessel was in service for nearly 10 years and the stains were observed only recently.

 

Regards,

Eswar Raju.

On Fri, Nov 22, 2013 at 1:54 PM, Perumal Govindan <perumalgovindan@gmail.com> wrote:

Mr. Raju,

As per my view of your NDT results, shows that the stress corrosion cracking after pitting corrosion caused by grinding operation while removal of spatters and excess dressing during manufacturing stages.

P Govindan

On Fri, Nov 22, 2013 at 6:57 AM, kalidindi raju <eswar.iitb@gmail.com> wrote:

Dear Friends,

 

Thanks for the views.

Would like to share some more info.

 

We carried out In-situ Metallography and DPT to the stained areas.

Found transverse cracks at stained locations using both the techniques.

 

The cracks are present on weld and either side of HAZ and are transgranular in nature. 

The cracks were observed both on circumferential seam and long seam.

They are branching on either side of HAZ with the portion on weld being a zigzag line.

 

Prima facie this appears to be a case of environment assisted cracking but still investigating the cause.

 

Regards,

Eswar Raju.

 

 

 

 

 

On Thu, Nov 21, 2013 at 2:50 AM, Perumal Govindan <perumalgovindan@gmail.com> wrote:

Mr. Raju,

Probable cause for this corrosion are,

1.the tanks located in a highly corrosive environment containing chlorides,

2. right choice of welding consumable, proper gas shielding and purging, welding technique, acid pickling and cleaning was not followed during manufacturing stages, review inspection reports and confirm OR as per Inspection Test Plan, the manufacturing process were not followed,

3. During Fit Up of of shell courses, different welding consumable (CS filler wire or electrode) might be used for tack weld.

4. very heavy grinding was carried out while fabrication without adequate protection of atmosphere.

With regards

P Govindan

On Wed, Nov 20, 2013 at 3:22 AM, kalidindi raju <eswar.iitb@gmail.com> wrote:

Dear Friends,

 

On a recent inspection of a Stainless Steel Vessel, there were some corrosive stains observed on near the weld.

Please refer to the pictures attached.

The stains indicate a leakage/flow behavior of the containment.

However, when observed visually there was no leakage of any liquid.

 

The vessel was in service since 2008.

Material of construction is Stainless Steel SS 316.

 

What could be the probable cause of this behavior?

Please share your views.

 

Regards,

Eswar Raju.

 

 

 

 

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