4x4 / Off-Road TechThis section contains all discussion related to taking the FJ Cruiser in Off-Road situations, 4x4 applications and any armor modifications.
is co2 safe in the heat? you know living in AZ heat a car can get up to 130 degrees....I know if you leave any pressured containers such as hair spray etc..under pressure items for the day and come back it will explode......
There are lots of people using these that live there without any issues. I would keep a window cracked if i knew it was gonna get that hot though.
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is co2 safe in the heat? you know living in AZ heat a car can get up to 130 degrees....I know if you leave any pressured containers such as hair spray etc..under pressure items for the day and come back it will explode......
Had my Ultimate Air tank in the truck in the AZ heat for over two years now without incident. YMMV! And, in over twenty years in the AZ heat I've never heard of pressurized cans exploding inside cars. In direct sunlight, maybe ...
what??? really oh man in chandler when I worked at intel there some folks (the newbies who got hired on during the boom) would leave their cans in their car and BOOM they come out after the 8 hour shift or 12 hour shift and (lol....I know not funny) their cans exploded in their car. You can tell who the newbies were with just that.
Quote:
azsarge previously said:
Had my Ultimate Air tank in the truck in the AZ heat for over two years now without incident. YMMV! And, in over twenty years in the AZ heat I've never heard of pressurized cans exploding inside cars. In direct sunlight, maybe ...
i think most of the issue is when the tanks are over filled....and then get hot. I weigh mine when I pick it up to make sure....my tank has its weight on outside and also the total weight.
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Small pressurized things with cheapo valves *might* be in danger (I think the mythbusters covered this and it's not really an issue)... but a CO2 tank is bomb proof.
Thanks to the nifty physical chemistry of CO2, the pressure inside the tank will never get above *maybe* 1200 PSI on the hottest of days even with the car in direct sunlight and the interior of the car melting plastic. The tank is good for at least 2250. The tank valve isn't going anywhere.
The pop off valve on some regulators (not the one on the tank) are going to release occasionally when you use a bunch of CO2 in continuous flow. The metal will get freezing cold from the flow of depressurized CO2 and ice chunks can interfere with the moving parts and the diaphragm may get stiff from cold. At that point, the low pressure side of the regulator is exposed to climbing pressures as the valve fails to close in time. The excess pressure then vents as a little puff of fog.
I have a welding regulator that tends to do that when it's sitting in the sun and I weld for a while continuously. I'm not certain why being hot on the outside and cold on the inside is the formula for failure, but there it is. Once it gets going, the pressure will creep up after I stop a weld bead and then it'll puff. It may puff a few times every 10 seconds or so before it warms up or I shut the tank valve to stop the waste.
My Powertank regulator has never had that issue as it's designed for high flow rates.
is co2 safe in the heat? you know living in AZ heat a car can get up to 130 degrees....I know if you leave any pressured containers such as hair spray etc..under pressure items for the day and come back it will explode......
Quality CO2 tanks are pressure tested to 3000 psi, far in excess of the max pressure of CO2 gas, which is about 1200-1500 psi. Remember that the tanks hold liquid CO2, not gaseous CO2, so the pressure is much lower until the valve is opened. Then the liquid evaporates at ambient temperature in to a gas, which then creates higher pressure. In addition, most quality CO2 systems have a high pressure blow-off valve in case the internal pressure of the tank gets too high. Basically, you'll never get the interior of the vehicle hot enough to create a high enough pressure in the CO2 tank to cause any problem, and there is a safety valve on it in case you could...
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Slight correction... the gas pressure falls as it comes out. The gas flowing through the valve and regulator is never at a higher pressure than it was in the tank. Maybe I read you incorrectly. Here's the principle:
Inside the tank, there is gas and liquid in equilibrium. The gas is NEVER higher pressure... once the gas reaches that pressure, it's compressed to liquid. If you pump in more gaseous CO2, it'll condense to liquid and the pressure will remain the same. When you release gas from the tank, the pressure of the gas falls, and liquid CO2 evolves instantly into gas, and the pressure rises and re-attains equilibrium, but with less liquid in the tank. That's why the pressure gauge stays the same until the bottle is almost empty. Then it plummets.
At a higher temperature, CO2 is capable of remaining gas at a slightly higher pressure. To increase temperature is to shift the equilibrium between liquid and gas.
/ WPOK492 
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