Handling 99% Nitric Acid
Handling 99% Nitric Acid
(OP)
We have an application we are looking at handling 99% Nitric Acid which is quite specialist and higher concentration than generally commercially available.
We are offering virgin ETFE lined components, replacing Glass filled ETFE parts from another pump manufacturer - does anyone have experience of handling this concentration Nitric with filled ETFE materials ? What was operational life ? Did the components commonly swell ?
We are offering virgin ETFE lined components, replacing Glass filled ETFE parts from another pump manufacturer - does anyone have experience of handling this concentration Nitric with filled ETFE materials ? What was operational life ? Did the components commonly swell ?
Ash Fenn
www.cdrpumps.co.uk





RE: Handling 99% Nitric Acid
There is not any memory with less satisfaction than the memory of some temptation we resisted.
- James Branch Cabell
RE: Handling 99% Nitric Acid
You must do your own tests here. Even raw materials suppliers data cannot be really relied on. It probably does not exist for the exact same reagent, and even if it does, it will not be on real world normal mouldings. The tests will have been done on test bars under conditions that maximise it's performance.
Do your own tests on real world mouldings under real world loads and temperatures.
Regards
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RE: Handling 99% Nitric Acid
You are right, it is nasty old stuff and need to be absolutely sure.
Ash Fenn
www.cdrpumps.co.uk
RE: Handling 99% Nitric Acid
There is not any memory with less satisfaction than the memory of some temptation we resisted.
- James Branch Cabell
RE: Handling 99% Nitric Acid
You really do need to do tests in real world conditions as there are more variables than you might at first imagine.
Regards
eng-tips, by professional engineers for professional engineers
Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips Fora.
RE: Handling 99% Nitric Acid
http://ntrs.nasa.gov/search.jsp
We used some small pumps to handle hot 65-70 % nitric that were made from PTFE and chopped PTFE molded together. A strange combination but it worked.
RE: Handling 99% Nitric Acid
RE: Handling 99% Nitric Acid
This organization/platform has performed independent assessments with regard to similar cases, including the nasty chemicals (like Acids, Chlorine and Bromine in ETFE), for a pretty long time.
They developed a programme called "Instationary Diffusion & Corrosion Simulator for Advanced Composites" (IDC-SAC), which seemingly works for all sorts of reinforced and multilayer polymer based materials (coatings on steel, grp on concrete etc).
Good luck,
Sarah