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auto-changeover propane regulator - Page 2

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Posted by David Lesher on June 26, 2010, 12:40 am

ddl@danlan.*com (Dan Lanciani) writes:

I too need a propane tank level sensor scheme. I found
<http://www.rochestergauges.com/Pages/PDFs/R3D.pdf>  mentioned.

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Posted by You on June 25, 2010, 7:42 pm

In article

there is ONE BIG reason you can't RV tanks on a generator of any size.
(10Kw) they are Vapor withdraw type tanks and they don't have enough
surface area to allow the propane liquid to boil off into gas, without
freezing up the tank.... duh... anyone who has ever tried it knows

Posted by vaughn on June 25, 2010, 8:08 pm

Huh?  The OP was asking about 2-1000 gallon tanks.  That is plenty of surface
area unless we are talking about sub-zero temperatures.  The flow capacity of
the regulator is a bigger concern.


Posted by harry on June 26, 2010, 8:23 am

No chance except in very hot conditions.  The latent heat requirements
of the propane soon cool the tank down to a point were the gas won't
vapourise off.

This is true even with liquid oxygen never mind propane.

Posted by vaughn on June 26, 2010, 11:32 am

 That is a huge overstatement.  If what you say were true, then nobody would use
vapor directly from a propane tank.  But actually vapor withdrawal is the most
common method!.  How much gas you can draw from a given propane tank depends on
the tank's size and the outside temperature.  Scroll down on this page for a
table that gives you the maximum BTUs based on tank size and outside
temperature. http://www.propane-generators.com/propane_usage.htm

I can connect a 20# BBQ tank to my 4000 watt generator at full load and the tank
will drop perhaps 10 degrees in temperature.  I can draw the tank totally empty
without the slightest concern for tank freeze up.    With that same generator on
a 100# tank, the cooling is barely detectible.  From there, you can do the math
to extrapolate to the comparatively huge tanks the OP is considering.



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