Sunday, May 9, 2010

Re: [MW:5111] Re: corrosion resistant plating

Dear Herman and Members,
Air receivers are not logically coated internally in Oil and Gas industry.
If some clients ask for internal coating it need to be followed. An
experience designer would clarify with client. Air Receivers are not
categorized as high risk ranking items, they normally are not inspected
while in or out of service. If you inspect them internally after 5-10 years
only shallow scattered pittings would be seen inside the vessel. No risk on
the continuous operation.
Even coating with high adhesion would peel off after long in service. This
risk is always higher than corrosion on vessel.


Regards



hpi001
<pieper-qsi@kpnma
il.nl> To
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05/06/2010 08:09 Subject
PM [MW:5094] Re: corrosion resistant
plating

Please respond to
materials-welding
@googlegroups.com


Dear Mr. Majdnia,

If a Air Receiver need to be painted depends completely on the
customers requirements. For example Shell mostly requires 300-350 µm
epoxy coating at the inside in order to prevent any corrosion caused
by high air humidity, especially if such air receiver is in front of a
expensive compressor.
To ensure that this coating doesn't come off Shell requires a special
pull off test for each serial coating system / material combination.
I'm not sure but I think that all these requirements are laid down in
Shell DEP 31.40.30.32.gen. This specification also specify the
requirements for surface preparation in order to ensure proper
adhesion.

Best Regards,

Herman Pieper

On 6 mei, 12:56, Fereidoun Majdnia <fmajd...@technip.com> wrote:
> Dear Pankaj
> Air Receivers are not normally painted or coated internally for two main
> reasons:
> 1- Air is not corrosive even in harsh environment and the moist
accumulated
> in humid areas is drained periodically not to build up inside the vessel.
> 2- If internally coated the coat may get pilled off and carried into
> instrument and cause their malfunction.
>
> Regards
>
>              pankaj abhang
>              <pankaj.abhang1@g
>              mail.com>
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Subject
>                                        [MW:5079] corrosion resistant
>              05/05/2010 03:03          plating
>              PM
>
>              Please respond to
>              materials-welding
>              @googlegroups.com
>
> Dear all
> I am having a vessel of CS i want to give corrosion resistant coating
from
> inside  any body will tell me the procedure such as paint, powder,or by
> electro plating method.The vessel is of  Air reciver vessel constructed
as
> per ASME. The coating to be done from inside to avoid corrosion.
>
> The size of vessel is  Dia-1100, Length-2400 mm.
> MOC- SA516 GR. 70
>
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