Propane tank PSI
When re-filling a propane tank...what is the PSI? Anybody know?
Forum Discussion
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More on propane tank conversion...
by: Anonymous
A propane tank has to be made to withstand over 140 psi as propane becomes a liquid at 140 psi (at room temperature), any container with a mix of liquid and gaseous propane will be pressurized to 140 psi, regardless of the ratio of liquid to gas. The major problem associated with using a propane tank as an air tank is that the tanks is just welded steel so one should coat the inside of the tank with a rust preventative paint and the tank new plumbing should allow for the draining of water from the tank. ie the tank should be upside down with a drain valve at the lowest level. Removing the old propane valve is the most difficult part of the conversion. After removing the valve por in the rust preventative paint put the valve back on temporarily and roll the tank and turn it end over end several times so the whole insides of the tank gets coated with paint. Remove valve, drain out excess paint and let the tank dry for several days before adding new pipes and valves. Include a pressure relief valve.
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The writer, who chooses to remain anonymous, but did actually sign in as DUH (unfortunate name that) makes some valid points.
Good that a propane tank is built to withstand 140 PSI. But... what is it rated for in terms of higher pressure. That you need to find out as your typical DIY type air compressor will discharge 150 PSI, and some of the more industrial types will send 200+ PSI into the tank.
If the propane tank is rated with a burst pressure exceeding twice the maximum pressure the compressor would put into it, then sure, use it, along with the PRV set to blow off way below the burst pressure of the tank, as the writer suggests. The thing is, if you don't know the burst pressure of the tank, don't use it! At least as far as I'm concerned.
More on propane tank conversion...
by: Anonymous
A propane tank has to be made to withstand over 140 psi as propane becomes a liquid at 140 psi (at room temperature), any container with a mix of liquid and gaseous propane will be pressurized to 140 psi, regardless of the ratio of liquid to gas. The major problem associated with using a propane tank as an air tank is that the tanks is just welded steel so one should coat the inside of the tank with a rust preventative paint and the tank new plumbing should allow for the draining of water from the tank. ie the tank should be upside down with a drain valve at the lowest level. Removing the old propane valve is the most difficult part of the conversion. After removing the valve por in the rust preventative paint put the valve back on temporarily and roll the tank and turn it end over end several times so the whole insides of the tank gets coated with paint. Remove valve, drain out excess paint and let the tank dry for several days before adding new pipes and valves. Include a pressure relief valve.
___________________
The writer, who chooses to remain anonymous, but did actually sign in as DUH (unfortunate name that) makes some valid points.
Good that a propane tank is built to withstand 140 PSI. But... what is it rated for in terms of higher pressure. That you need to find out as your typical DIY type air compressor will discharge 150 PSI, and some of the more industrial types will send 200+ PSI into the tank.
If the propane tank is rated with a burst pressure exceeding twice the maximum pressure the compressor would put into it, then sure, use it, along with the PRV set to blow off way below the burst pressure of the tank, as the writer suggests. The thing is, if you don't know the burst pressure of the tank, don't use it! At least as far as I'm concerned.
