I definitely agree with the below statement.
From corrosion testing we have performed on 316L and 2101 duplex the HAZ on these welds are very prone to pitting and crevice corrosion due to austenite and ferrite balance.
Heat input is critical.
The elevated temperatures are definitely a factor in the corrosion equation.
With the environment carbon pickup is definitely a factor.
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Alan Denney
Sent: Wednesday, September 30, 2015 6:44 AM
To: materials-welding@googlegroups.com
Subject: [MW:23629] RE: 23626] Re: NEED ADVISE CORROSION IN INHIBITOR TANK REGD
In my view it comes down to understanding the environment in which the material is to be exposed, (marine and high temperature relative to CPT) and the limitations of 316 stainless steel. There is a lot of information on the web if you do a search. The material selection is hence wrong for the external environment, or the tank should have been painted – yes you do paint stainless steel!
Alan Denney
AKD Materials Consulting Ltd
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com]
Sent: 30 September 2015 10:55
To: pgoswami <pgoswami@quickclic.net>
Cc: <materials-welding@googlegroups.com> <materials-welding@googlegroups.com>
Subject: [MW:23626] Re: NEED ADVISE CORROSION IN INHIBITOR TANK REGD
Dear Sir,
It's is a corrosion inhibitor storage tank for subsea pipeline project ,
operating temperature is 40degree Celsius ,
Operating pressure. Is .7KPA
Chemical is injected inside the tank , as per design data sheet there is no insulation.
Now I have planned to visit the location and provide more information in environmental condition,
Almost 5years completed and dispatched the job.
P.NEILASHKUMAR
Sent from my iPad
MOB : 966 533098265
91+9952110791
On Sep 30, 2015, at 5:27 AM, pgoswami <pgoswami@quickclic.net> wrote:
Hi Neileshkumar,
What're the surrounding operating or environmental conditions around the tank. Are there any acid fumes involved. Looks like this tank was not insulated at all??? Is that true.
Appreciate more information on the operating conditions.
Thanks
Pradip Goswami, P.Eng,IWE
Welding & Metallurgical Engineering Specialist
Hamilton, Ontario, Canada
pgoswami@quickclic.net
pradip.goswami@gmail.com
ca.linkedin.com/pub/pradip-goswami/5/985/299
-----Original Message-----
From: Neilash Kumar [mailto:neilashkumar@yahoo.com]
Sent: Tuesday, September 29, 2015 2:45 AM
To: Pgosami Sir; Pgosami sir
Subject: NEED ADVISE CORROSION IN INHIBITOR TANK REGD
Dear Sir,
Good Morning, please find the attached tank drawing fabricated by us for our client & it is corroded fully , Can you please clarify,
1. Why the tank are corroded So fast?
2. Can you please advise us the method to stop /reduce the rate of corrosion by applying a top coat & what type of coating to be applied?
please advise me . Material is 316L tank.
Regards
P.Neilashkumar
<Tank Corrosion.pdf>
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