Piping Material Selection for 37% HCL- cPVC, uPVC, PVC vs epoxy lined MS Piping

[WarriorofGondolin]

Hello Everyone,
I am working at a chemical plant that stores 37% conc. HCL in a double layered epoxy coated Carbon Steel tank and transfers that acid into dilution tanks via epoxy lined MS Piping. Due to ageing, we are planning on replacing the current tanks with FRP tanks and associated transfer piping with "cPVC, uPVC, or PVC". Pipe sizes are NPS 3 inch.
I have searched for chemical compatibility datasheet in the internet and found out that cPVC serves this purpose best.
Can anyone suggest some expert opinion on this matter as to the isolation valve material requirements and best piping materials?

 

[EdStainless]

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P.E. Metallurgy, consulting work welcomed

 

[Dhurjati Sen]

How long did the original tank and piping last?
Why is this change of materials?

DHURJATI SEN
Kolkata, India

 

[WarriorofGondolin]

Hello, the original HCL tank and associated transfer piping have been in operation for more than 25 years now. Tank epoxy re-coating was done 10 years back.
Decision to Change the materials of the tanks and piping was taken as the tank was no longer safe and leak-proof and the piping system was severely corroded at some places. Thank you.

 

[Dhurjati Sen]

Surely the identical material would run for another 25 years, the service and operating conditions remaining the same.

So why this material upgradation?

DHURJATI SEN
Kolkata, India

 

[pierreick]

Hi,
Consider this resource from Solvay.
Pierre

 

[pierreick]

Hi,
Another resource.
Pierre

 

[WarriorofGondolin]

Thank you Pierreick. Sorry, it has been some time since I logged in.
I have gone through the pdfs. Certainly gave me some insight.