Hot Acid Piping Materials
Hot Acid Piping Materials
(OP)
Looking for any recommendations for research on piping for a low pH hot system. It's ~1-2pH and 180-225degF. They currently use carbon steel and replace spools often, which may be more cost effective than an exotic material. But this has to be relatively standard operation conditions in sulfuric acid plants, refineries, etc. Flowrate is around 100gpm and piping is ~3"-4", so tubing won't work. Low pressures up to 125psig.
Thanks in advance!
Thanks in advance!





RE: Hot Acid Piping Materials
Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04
All answers are personal opinions only and are in no way connected with any employer.
RE: Hot Acid Piping Materials
http://www.cranechempharma.com/chempharma/brand/re....
How much CS piping is being replaced ? How often ?
Is the piping exhibiting classic "grooving" failure at the 12:00 o'clock position ?
Are you using schedule 80 ( or thicker) piping ?
Tell us more...
RE: Hot Acid Piping Materials
RE: Hot Acid Piping Materials
RE: Hot Acid Piping Materials
With the right alloy you will have zero corrosion allowance.
Walls of 0.065" - 0.083" would be suitable.
What acid is it and what is the total halide content?
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Plymouth Tube
RE: Hot Acid Piping Materials
I like what I've found on PTFE lined pipe, and cost seems reasonable (compared to exotic metals). My only concern is abrasive wear from TSS metals, but we can limit that with moderate velocities.