[Robotgroup] hostile enviro

[Def Egge]

My reading of "freezing water" was more figurative than literal but, 
just in case, friction-fitted "freeze plugs" are the automotive 
solution to preventing ice from cracking cast-iron engine blocks.

If corrosion of the cast-iron is a problem, fresh antifreeze contains 
a number of corrosion inhibitors in addition to the ethylene 
glycol.  Of course, ethylene glycol may introduce a different set of 
problems.

Depending upon the size of the sensor / housing, I'd used 'recycled' 
nitrogen gas tanks [rated well in excess of 3000 psi] .... cut the 
canister, weld flanges to both parts of the canister, bolt them 
together with an appropriate gasket between the flanges, and you have 
a reasonable facsimile of a 'pressure chamber'.  Keeps hot food hot 
and cold foods cold ... but how does it know?  ;-)

A resourceful dude like you could probably locate a segment of 
stainless steel pipe & a pair of flanges and fashion a chamber to 
withstand whatever pressure you anticipate.


Good luck, Brooks.

Mike


At 10:59  2008-01-10, you wrote:
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 >I've seen PVC used around hot, cold and salt water. I doubt it'll 
hold
 >up to
 >freezing water under any pressure though.
 >
 >We used stainless "containment vessels" for extreme testing in a
 >previous
 >career, but again freezing water under pressure will create 
problems.
 >
 >Simple version might be a cast iron pot. They have sloped sides 
from
 >the
 >casting process, so ice should "rise" in the pot rather than 
creating
 >enough
 >sideways pressure to crack it.
 >
 >Paul
 >
 >On Jan 10, 2008 10:52 AM, brooksdesign <brooksdesign at peoplepc.com>
 >wrote:
 >
 >>  Hey industrial kids,
 >>  do any of you have any experience with matireals for hostile
 >enviroments
 >> like hot/cold salt water and oil? I'm designing a torture chamber 

 >for some
 >> automotive sensors so it needs to be able to handle boiling and
 >freezing
 >> water.
 >> -brooks
 >>
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