Propane Tank

HomeBrewTalk.com - Beer, Wine, Mead, & Cider Brewing Discussion Community.

Help Support Homebrew Talk:

WeHeavy

Well-Known Member
Joined
Apr 19, 2008
Messages
105
Reaction score
18
Location
NW Ohio
Anyone know how much line PSI a 20 lb unregulated propane tank has?

I'm wanting to extend the hose on my setup.
 

Dr_Deathweed

Well-Known Member
Joined
Jul 20, 2007
Messages
2,376
Reaction score
49
Location
Bryan
If you are going to extend line, I would do it AFTER the regulator. No reason to kill yourself over a few feet of gas line....
 
OP
WeHeavy

WeHeavy

Well-Known Member
Joined
Apr 19, 2008
Messages
105
Reaction score
18
Location
NW Ohio
Leave it to the wife to figure it out.

She looked at the tank and saw it had 375 pounds forged into the safety relief valve.
 

jds

Well-Known Member
Joined
Oct 24, 2007
Messages
1,912
Reaction score
38
Location
Littleton, CO
The vapor pressure of propane depends on the temperature of the tank. Here's a chart:



Data lifted from Engineering Toolbox

The 375 lb figure for the relief valve is not the pressure of the propane. The operating pressure of the valve is based upon the design MAWP (Max. allowable working pressure) of the tank, derated by an adequate safety factor. I haven't taken the trouble to look up CGA specs for portable propane tanks to determine the derating factor.

As said previously, you should extend the line after the regulator. It's a lot more forgiving of construction mistakes.
 
OP
WeHeavy

WeHeavy

Well-Known Member
Joined
Apr 19, 2008
Messages
105
Reaction score
18
Location
NW Ohio
After seeing the relief valve was rated at 375, it had more pressure than I cared to mess with.

Thanks
 

Philip1993

Well-Known Member
Joined
Jul 5, 2007
Messages
1,643
Reaction score
19
Safety relief valves are generally rated at 1/2 the burst pressure of the vessel and/or 2x teh working pressure under typical conditions. If you must extend the HP side, plan for 375 working PSI and you should be fine. Plus, the SRV will back you up in the event of an overpressure. Can you plan for 200#? Sure, but if that thing sits in the sun and hits 110°F you may have a failure.
 
Top