Need information on nitrogen purge fire prevention system and Nitrogen
percent monitors for high temperature hostile enviornments (250-500
degree f.) I would like to install them on our mfg. product. Thanks
3rrotec

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Request for Question Clarification by techtor-ga on 02 Feb 2004 09:29 PST

Hello 3rrotec,
What sort of information do you need? Are you looking for basic info
about those products, or on how to acquire the best products so you
could order them for your purposes?

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Clarification of Question by 3rrotec-ga on 04 Feb 2004 05:35 PST

The main thing I need is pipe sizing from a liquid nitrogen tank to
the chamber. I am familiar with the Q=V*A formula, but don't know how
to figure the inlet pressure required(pressure drop). Use these
parameters: Input pressure from regulator off liquid nitrogen tank 20%
full, Pipe length 300 feet(this will allow for elbows, tees, etc.),
the chamber volume is 100 cu. ft. I would like to purge the chamber in
1 minute. Sorry for the delay in clarification- hardware problems.
Please show formulas, charts, etc. If this gets too involved for the
$20.00 I will up the ante. Thanks Robert Williams 3rrotec

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Clarification of Question by 3rrotec-ga on 04 Feb 2004 10:10 PST

I have found out inlet pressure will be a constant 75 lbs. Figure pipe
size to deliver 100 cfm @ stp for 200 feet and 400 feet. Thanks
3rrotec