Thermally conductive corrosion resistant polymer
Thermally conductive corrosion resistant polymer
(OP)
Hi all,
I am looking into the possibility of substituting a polymer material, possiblye HDPE, for titanium in a plate heat exchanger (PHE) application. The working fluids are sea water and ammonia. The approach temperature is fairly ambient and the pressure is below 200 psi. The concern I have with titanium is its cost and availability. The tradeoff I'm willing to make for a substitute is increased area requirement and possibly with lifetime. Any suggestions for a material that could work under these conditions?
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I am looking into the possibility of substituting a polymer material, possiblye HDPE, for titanium in a plate heat exchanger (PHE) application. The working fluids are sea water and ammonia. The approach temperature is fairly ambient and the pressure is below 200 psi. The concern I have with titanium is its cost and availability. The tradeoff I'm willing to make for a substitute is increased area requirement and possibly with lifetime. Any suggestions for a material that could work under these conditions?
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RE: Thermally conductive corrosion resistant polymer
The absolute pressure of the two streams is one issue, but the differential pressure between the seawater and the ammonia is the key issue- there will be nothing but a sheet of plastic between the two streams. 200 psid isn't all that modest with respect to polymeric materials in pressure retaining service as opposed to polymer-lined metal components. The effective strengths of the polymeric materials decrease rapidly with modest increases in temperature, making the problem even worse.
The other issue to consider is the permeability of the chosen polymer material to ammonia- not something you would need to worry about with titanium.
RE: Thermally conductive corrosion resistant polymer
Thanks for the input,
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RE: Thermally conductive corrosion resistant polymer
have you looked into coating a less expensive metal?
maybe a teflon,PP, or PVDF coat
RE: Thermally conductive corrosion resistant polymer
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RE: Thermally conductive corrosion resistant polymer
custom teflon coating quotes can be easily found all over and people often will ofer a free sample. Borealis(sp?) makers of borocoat do alot in pipe coating.