Propane pressure at tank.

[aruba5er]

I know the propane system runs at 11" ( about 1/2#) but does anyone know the pressure at the tank. Some dirty little mice took a liking to my hose from the tank to the regulator and chewed the outer rubber off. I need to replace it and have some hoses off a gas grill but it is marked 1# and the hose on the camper is marked 350#. I know the pressure is NOT 350 but what IS it? If more than 1# I'll have to buy a hose, but If not I can save a few bucks. Thanks. And please, no lectures about how dangerous propane is and how I might blow up and all that stuff. I know, having served a 2 year pipe fitting apprenticeship.

[joe_b_]

I had to replace the propane hoses on my 5th wheel, as somehow the propane was leaching something out of the India built hoses. It clogged the system, especially the regulators. Got new hoses and regulators, a two stage and a high pressure one for the far side tank. The hoses were all marked as 350psi working pressure with a 600psi burst pressure. Bought most/all from Amazon, but some were shipped by Mr. Buddy Heater Company, as I remember, some from Amazon.

[mobeewan]

If you get the hoses fabricated, make sure they use hose fittings that are rated to the higher pressure as well as the hose. I had a low pressure hose with quick connect made for a portable oven (11" pressure) at a shop that sold and installed gas logs and high dollar kitchen ranges (Jenair type that even had grills in the top). I used it to connect the oven to the low pressure outside stove connection on my pop up. Asked them to make some high pressure hoses for me and they said they didn't have the fittings and the crimping equipment for them. Had to get them made at a welding supply shop. Make sure the hose is also rated to handle propane.

[aruba5er]

Thank you all. I will get the proper PSI hose. I just didn"t know and did not want to take any chances.

[69_Avion]

They make them with the 350 psi hose or the soft drawn copper. You are right, copper can work harden. I use the copper lines when they are exposed to the AZ sunlight, and I've never had one go bad in 45 years, except for one that was internal to my 1969 Avion camper and it rubbed against a copper water line. Fortunately, the water line broke first. LOL

[da_bees]

69 Avion wrote:
Some folks actually buy soft copper pre made lines for this piece.

They do but they shouldn't. The tanks and regulators vibrate during transit which can potentialy work harden and crack the copper.
No lecture intended but using industry standard procedures and material is how we avoid mistakes while dealing with issues we don't fully understand.
Having said that,you can save money buying from a parts house or LP equipment dealer that fabricate approved hose in house instead of rv dealer.

[69_Avion]

http://www.protanksupply.com/propane-pigtails.asp

[soling2003]

Tank pressure is usually in the 100psi rance, so your 1 psi hose will not do.

[69_Avion]

You need the high pressure hose from the tank to the regulator. Some folks actually buy soft copper pre made lines for this piece.

[wgriswold]

Lots of variables to consider to get the psi during use. But the criteria for the hose to the regulator would be the max psi at say, 130 deg plus some safety factor.

[Old-Biscuit]

RV propane regulators are two stage regs.
1st stage drops tank/cylinder pressure down to 15# and 2nd stage drops pressure to 11" WC (.4#).

Tank/cylinder pressures vary due to temps and amount of butane mix.
At -44°F the pressure is 0 psi. As the temperature increases so does the pressure. At 0°F you have about 28 psi, at 32°F about 60 psi. At 72°F about 130 psi and at 100°F close to 200 psi.

Go buy the correct/proper hose as a good pipe fitter apprentice should do.

[ktmrfs]

wgriswold wrote:
The pressure varies with temperature. At 30 deg F it is about 50 psi and at 100 deg it is about 180 psi.

that's at the propane temp, not necessarily ambient since the propane temp drops as it boils at about -40F as you draw off the vapor. So tank pressure varies all over the map depending on draw rate, temps etc. The tank will vent if pressures get to high, but don't know what that pressure is.

One reason for using a two stage regulator is to get a more constant outlet pressure over the wide variation of tank pressure. First stage regulates to an intermediate pressure, the second stage then regulates down to the final roughly 1/2 psi.

[wgriswold]

The pressure varies with temperature. At 30 deg F it is about 50 psi and at 100 deg it is about 180 psi.