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Re: [MW:5715] Chloride stress Corosion for SS316(For See Enveronemt)

By Materials & Welding
Hi Prakash,
 
I agree on the Mr.Kristan suggestion.
 
On top of below mail, you may consider the superduplex with increased Nitrogen content for the better properties.
 
Rgds,
K.Babu
Singapore.
 
----- Original Message -----
Sent: Tuesday, June 22, 2010 9:53 PM
Subject: RE: [MW:5709] Chloride stress Corosion for SS316(For See Enveronemt)

SS316 shall not be used for seawater service at all. Also not if the temperature is only 20 deg. C.
 
You actually did not wrote what the fluid inside the piping is???
That is very important to give you an alternative, but duplex or super duplex is probably good alternatives.
 
The 60 deg C temperature limit stated in for example NACE MR0175/ISO 15156 is concerning risk of chloride induced stress corrosion just from the air in an marine environment - i.e. from the outside of the piping.
 
If your piping instead is in duplex or super duplex SS, the 316 gasket will be the weak part - i.e. it will be subject to galvanic corrosion and to some extend also crevice. Your spiral wound gasket or ring (for RTJ flange) need to be in duplex also.
 
regards
Kristian   

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of prakash kamathuru
Sent: 22. juni 2010 13:44
To: materials-welding@googlegroups.com
Subject: Re: [MW:5704] Chloride stress Corosion for SS316(For See Enveronemt)

Hi Babu\Bathula,
 
Thanks for your advices,
 
If i am using the SS316 Gaskets for Duplex steel and the temperature is 80 deg C,is it acceptable.
 
I am thinking that when gaskets are compressed the stress corossion may not occur
 
Please give your feedbacks
 
Regards,
 
Prakash K B

On Tue, Jun 22, 2010 at 12:02 PM, Kathalingam Babu <kathalingam.qaqc@ppl.com.sg> wrote:
Hi
 
For the sea environment (Where sea water exposure or low flow rates) SS316 will not be suggested.
 
Rgds,
 
K.Babu
 
 
----- Original Message -----
Sent: Tuesday, June 22, 2010 5:49 PM
Subject: [MW:5700] Chloride stress Corosion for SS316(For See Enveronemt)

Hi all,
 
Can any one advise me usage temperature for SS316L in offshore enveronemnt.
 
As for as i know it can be used up to 60 degc.But now i have temprature of 80 Deg C.If any on eknows and have information abt this pls reply me.
 
And the same Case is Applicable for SS316 L RTG Gaskets also.
 
Regards,
 
Prakash K B

On Mon, Jun 21, 2010 at 7:06 PM, Sandeep Kp <sandeepkp99@yahoo.com> wrote:
Dear All,
I am going to conduct CSWIP 3.1 Examination on coming 05-july-10.
Any body have latest(2010) model questions of the same? or can advice any web sites.
 
 
 
Thanks,
 
Sandeep.k.p

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