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jwasir
18-09-2008, 02:57 AM
What kind of wall thickness is required for copper tubing in evaporator running at ultra low temp i.e. -90F SST.

Any ideas!!
Toolman
18-09-2008, 11:33 PM
18 gauge copper will cover it http://www.spiralmfg.com/downloads/physical_properties.pdf
Brian_UK
18-09-2008, 11:54 PM
The pressure that you need to refer to is the static pressure at the ambient temperature when the system is not running.
US Iceman
19-09-2008, 12:10 AM
As Brian indicated, the wall thickness is based on the highest observed pressure. It does not matter if it is running or not. Which condition has the highest pressure?

Obviously, for this case cited the highest pressure would be during a shut down condition.
Brian_UK
19-09-2008, 12:13 AM
I suppose you could also look at the crushing conditions when the pipe is surrounded by ice ???
jwasir
19-09-2008, 01:16 AM
I suppose you could also look at the crushing conditions when the pipe is surrounded by ice ???

Yes.....I want to know the thickness of pipe required to withstand the ice load.
Brian_UK
19-09-2008, 10:55 PM
To be honest I wouldn't think that there would be a major icing problem.

To achieve those temperatures would normally require a(n) (en)closed space so there would be a limited amount of moisture to be turned into ice.