Cladding Thickness for CS

[ChihebG]

Experts,
How can I assess the cladding thickness(SS 304) of carbon steel in a highly-corrosive environment?

Regards,

 

[EdStainless]

Do you mean how much you need, or how much you actually have?
What kind of cladding? explosively bonded, roll clad, or weld overlay.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, Plymouth Tube

 

[ChihebG]

Thank you EdStailess.
I mean how much I need.
My environment is a CO2 rich Amine, I have chosen the pipes material as CS and 304 Cladding.
I need to know how to caclulate the cladding thickness knowing all the operational conditions.
I am sorry to not define the nature of the cladding because I am new in the cladding field.

 

[EdStainless]

If it is roll or explosion clad then it just needs to be there, how thin can you work with? I have seen 0.060" used with Ni alloys. It depends on what you fabricator is familiar with and who you are getting material from.
There is no corrosion allowance used with SS, when it fails it will be localized corrosion (pitting) so thickness is not relevant.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, Plymouth Tube

 

[georgeverghese]

Not sure if you will get by with just SS 304 - should it not be SS316L at least?

 

[weldstan]

Assuming that the pressure bearing carbon steel is relatively thin, roll bonded or explosion bonded I the method to be used. Standard thicknesses are 0.060" and 0.109". If there is minor chloride present, use 316.

 

[samsam1973]

For corrosion resistant 304L 0r 316L cladding we use 0.0125" as standard thickness.

 

[georgeverghese]

Though there may be a tempering effect from the amine, think the chloride pitting resistance for SS304 is still poor - a materials selection engineer should advise / confirm.

Using cladded pipes may turn out to be a nightmare during construction.

 

[ChihebG]

Thank you for your responses. My environment is rich amine: I think using Cladded CS or some internal pipe coatings in place of Stainless steel. are there any suggestions related to this issue?

 

[StoneCold]

ChihebG
How big is the pipe? Total Length? Design Temperature and pressure?
Knowing all that you can get better advice.

Regards
StoneCold

 

[EdStainless]

ID clad pipe is usually only cost effective for larger diameters.
If you are welding the pipe then the procedures are fairly involved.

Don't get hung up on 316 vs 304. Unless you specify 316L with Cr and Mo above the spec midpoint it will have no better Cl pitting resistance than 304L.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, Plymouth Tube