NCG/Turpentine Handling (Metallurgy)

[Webster_ENG]

When designing a separator to handle non-condensible gases and turpentine vapors (non-PSM) what is the recommended steel? Currently, our turpentine system uses carbon steel (of unknown manufacturing specs) and zero stainless anywhere but in piping. Can I get away with running 1040 CS? For context, the current system using carbon steel has been in place for over 50 years and has had minimal issues, I'm just unsure if standards have changed since the 70's. In my mind if it ain't broke don't fix it, but I'm curious to see what others have to say.

 

[mk3223]

It looks that the the CS material isn't an issue as it has been in service for years.
Since no original design data, you may record the design record by confirming the process for the system, such as the detail process, equipment material selection, pressure and temperature, work scope, etc. for the future reference.

 

[EdStainless]

I would test some samples (removed and sent to a lab) for chemistry.
First, I doubt that it is 40 Carbon, that sounds high, and all of the welds will require pre-heat and PWHT.
Second it may be a low alloy steel with a bit of Cr in it.
In m any services even 0.25% Cr can really help performance.

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P.E. Metallurgy, consulting work welcomed

 

[pierreick]

Hi,
My experience with resins and solvents (solvesso150, isoparar,kerosene) has always been Stainless Steel (304 L or 316 L).
Pierre