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Wayne.B

On Thu, 02 Feb 2012 18:58:49 -0500, wrote:

On Thu, 02 Feb 2012 17:04:38 -0500, X ` Man
wrote:

On 2/2/12 4:56 PM, wrote:
On Thu, 02 Feb 2012 12:59:23 -0500, X ` Man
wrote:

On 2/2/12 12:52 PM, wrote:

The big difference is propane is stored at around 100 PSI, CNG is more
like 2600-3000 PSI (both temperature dependent).
You also have a much higher energy density on propane. My guess is the
gas would be transported at the normal distribution pressures and
compressed to liquid at the fueling site.

I'll have to discuss this with the propane truck driver who fills our
buried tank. I don't know what state the gas is while it is in his truck
and if there are changes made to it while it is being pumped into our tank.

Propane is liquid in the tank, pretty much like the stuff you see in a
cigarette lighter.

I'll have to talk to the delivery guy. I've never actually watched him
top off the tank. I'm sure you're right, though.

I have had several long talks to my gas supplier when I was
considering converting my outboard to propane. There is a liquid pick
up in most tanks but they are real guarded about telling you how to
use it and they absolutely will not talk to you about a transfer pump
in residential zoning.

There are a couple of internet discussions telling you how to fill 20#
tanks from your bulk tank. It is a lot easier with an above ground
tank but mine is buried.
Basically you cool the 20# tank and hook it to the liquid line of the
bulk tank. It is not nearly as fast as the pump.

===

Any pump certified as safe for gasoline should be OK. Leak prevention
at all of the fittings is the major issue other than grounding/spark
avoidance.

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