WeHeavy

Recipes 

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

Recipes 

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....

__________________
"Never ascribe to malice that which can be adequately explained by incompetence." - Napoleon Bonaparte
“An intelligent man is sometimes forced to be drunk to spend time with his fools.” - Ernest Hemingway

Fermentation Cabinet●Adding Faucets to a Tower●DIY Hopback●Portable Kegerator

WeHeavy

Recipes 

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

Recipes 

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.

WeHeavy

Recipes 

After seeing the relief valve was rated at 375, it had more pressure than I cared to mess with.

Thanks

Philip1993

Recipes 

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.

__________________
OdorDestroyer.com - Pet odor removers and related products.