4x4 / Off-Road TechThis section contains all discussion related to taking the FJ Cruiser in Off-Road situations, 4x4 applications and any armor modifications.
You guys are a wealth of knowledge. I guess what I'm understanding in lay terms---if you don't overfill the tank, it should be safe inside the FJ as long as the overflow valve is pointed toward the rear.
You guys are a wealth of knowledge. I guess what I'm understanding in lay terms---if you don't overfill the tank, it should be safe inside the FJ as long as the overflow valve is pointed toward the rear.
The pop off valve that's likely to blow is on the regulator. Unless you're using the CO2 tank to run an onboard air system with an ARB air locker installed, there's no reason for you to be driving around with the tank valve open.
The tank with a closed valve will handle the CO2 just fine. The tank is hydrostatically tested to a pressure in excess of 2500 psi. The CO2 fill is around 1000 psi. If you burp liquid CO2 into the regulator, though, it will decompress to a pressure below the phase change line in the phase diagram. It will evolve into gas and blow the pop off valve on the regulator.
There *IS* a pop off on the tank valve, but it's set for a much much higher pressure. Instead of protecting the regulator, it's protecting the tank. I suppose it's possible to blow this valve with CO2, and if it's possible, then it's happened... but that's not the typical CO2 incident. The typical incident is with the regulator pop off.
I had a crappy CO2 regulator on a welding bottle for a while, and if I did enough continuous weld, the regulator would freeze open. When I took my finger off the trigger, the downstream pressure would mount rapidly and the pop off would go. Then I'd have to shut off the flow at the tank or lose all my gas... and then wait for it to thaw.
The pop off valve that's likely to blow is on the regulator. Unless you're using the CO2 tank to run an onboard air system with an ARB air locker installed, there's no reason for you to be driving around with the tank valve open.
The tank with a closed valve will handle the CO2 just fine. The tank is hydrostatically tested to a pressure in excess of 2500 psi. The CO2 fill is around 1000 psi. If you burp liquid CO2 into the regulator, though, it will decompress to a pressure below the phase change line in the phase diagram. It will evolve into gas and blow the pop off valve on the regulator.
There *IS* a pop off on the tank valve, but it's set for a much much higher pressure. Instead of protecting the regulator, it's protecting the tank. I suppose it's possible to blow this valve with CO2, and if it's possible, then it's happened... but that's not the typical CO2 incident. The typical incident is with the regulator pop off.
I had a crappy CO2 regulator on a welding bottle for a while, and if I did enough continuous weld, the regulator would freeze open. When I took my finger off the trigger, the downstream pressure would mount rapidly and the pop off would go. Then I'd have to shut off the flow at the tank or lose all my gas... and then wait for it to thaw.
The pop off valve that's likely to blow is on the regulator. Unless you're using the CO2 tank to run an onboard air system with an ARB air locker installed, there's no reason for you to be driving around with the tank valve open.
The tank with a closed valve will handle the CO2 just fine. The tank is hydro statically tested to a pressure in excess of 2500 psi. The CO2 fill is around 1000 psi. If you burp liquid CO2 into the regulator, though, it will decompress to a pressure below the phase change line in the phase diagram. It will evolve into gas and blow the pop off valve on the regulator.
There *IS* a pop off on the tank valve, but it's set for a much much higher pressure. Instead of protecting the regulator, it's protecting the tank. I suppose it's possible to blow this valve with CO2, and if it's possible, then it's happened... but that's not the typical CO2 incident. The typical incident is with the regulator pop off.
I had a crappy CO2 regulator on a welding bottle for a while, and if I did enough continuous weld, the regulator would freeze open. When I took my finger off the trigger, the downstream pressure would mount rapidly and the pop off would go. Then I'd have to shut off the flow at the tank or lose all my gas... and then wait for it to thaw.
I just got back from a trip to the Maze in Utah. 3 days into the trip I had the back door open and was getting a fuel can off the top and the tank pop off valve blew. I am very happy that I was not driving at the time. I may be switching to a compressor system.
I just got back from a trip to the Maze in Utah. 3 days into the trip I had the back door open and was getting a fuel can off the top and the tank pop off valve blew. I am very happy that I was not driving at the time. I may be switching to a compressor system.
was it just a loud pssssssss????
__________________
"'Democracy is two wolves and a lamb voting on what to have for lunch.
Liberty is a well-armed lamb contesting the outcome of the vote.'
-Benjamin Franklin"
2007 Supercharged Voodoo Blue
Bajarack and other various parts from TRDparts4u.com
The tank is behind the Scorpion Rack so even if a pressure plug blows, the most it will do is bounce off the rack or the back of the seat.
When I had a 10 lbs tank mounted (I still have the tank but use a 20 lbs tank now) on the side the way Layon has it, I put some wide 3M non-skid tape on the top of the plastic ledge to (1) protect the plastic and (2) help keep the bottom of the tank from "scooting" in small directions on the plastic while I was bouncing over rocks and rough roads.
Even though there isn't a tank there anymore, you can see the non-skid in the photo above.
__________________
There is nothing like returning to a place that remains unaltered, to find the ways that you have changed.
I don't know if my tank was over filled. When the tank went it was a deafening noise. Had I been driving at the time who knows what would have happened. W5WI was also there when it went and he can attest to the sound.
I had a tank valve go once and can attest to the sound. Mine was on a roof rack mount at the time so it wasn't inside the FJ. I heard it go when I was inside the house (it was that loud). I called the PowerTank people and asked WTF? It wasn't hot outside and I had used the tank so the pressure was somewhere around 2/3 fill. They said that sometimes the pressure release valves just blow and there's no accounting.
__________________
There is nothing like returning to a place that remains unaltered, to find the ways that you have changed.
Several years ago a friend of mine with a Landcruiser 80 series told me a story.
His tank had been topped off to much, and he kept it in the rear like I do.
From an October Fall Colors run on the Naches trail back in 2000.
He was in the grocery store with his dog in the rig.
He came back out to put the groceries in, and his big dog had crapped all over the rear seat.
The valve thing popped, and literally scared the crap out of his dog.
Linear Mode
