On Fri, 14 Apr 2017 17:49:21 -0400, Ed Pawlowski wrote:

On 4/14/2017 3:40 PM, Mark Lloyd wrote:
On 04/14/2017 01:26 PM, Pat wrote:

[snip]

Common BBQ tanks can hold 20 pounds, but are usually only filled to 15
or 16 pounds depending on the supplier. I have read that it is safer
that way and is required by regulations. I don't fully understand the
safety issue, but it has been that way for many years.


I have had 20 pound tanks filled by 2 different suppliers. They were
always filled to 19 or 20 pounds.


How long ago? Newer tanks with an OPD will not work very well filled
that much.
Yes, Ed, they will The tanks are DESIGNED to be filled with 20 lbs of
Liquified Petroleum Gas. Since Propane wighs 4.25 lb/gallon and Butane
wieghs 4.81, 20 lbs of Butane is 4.15 gallons, or 4.7 gallons of pure
propane,and an 80% WC fill of Butane in a "20 lb" bottle is 24 lbs.
and 21 lbs of pure propane.A 20 lb fill is well within the design
parameters and I've never had a problem with one EXCEPT if the flow is
exceded - which is another good reason to manifold 2 tanks.