93% sulfuric acid isolation valve and programming

[lacticman]

I am installing an automated isolation valve to protect a sulfuric acid control valve (after isolation valve) from deteriorating by acting as an isolation valve as well as a pH control valve. Before I automate a handvalve, what things do I need to consider in programming or design of that valve. I have heard some concerns with trapping sulfuric acid in between two valves and causing damage to piping due to the high thermal expansion coefficient of 93% sulfuric acid. Thanks for your input.

 

[bimr]

Here is a link for you:

http://www.genchemcorp.com/pdf/tsr5078.pdf

"Sections of piping which are blocked with closed valves due to operating conditions should be vented to the storage tank to prevent pressure buildup due to temperature or the
formation of hydrogen, which is formed when handling sulfuric acid in steel piping. Vent piping may be Schedule 40 PVC."