Derswede
Well-Known Member
I was involved with an ELF project in Argentina for CNG (compressed natural gas )
fuel for cars. The main feed was your normal gas main. At the station, there was a compressor to allow a steady flow of gas at rated volumes (do not remember that number). Self sealing fittings were used for fuel transfer. The local cabbies loved it, as it was cheaper than petrol. Tank was the big problem, it took up space that could be used for luggage, etc. Tanks were trunk mounted to protect them in case of an accident. Lots of local trucks, buses and the taxis were converted. It has been a couple of years since I have been back, but a quick search shows that it is still commonly used.
At a typical fuel station, you have two main tanks in the ground....one Hi test, one low test. An "STP" (submerged turbine pump) is in each tank, so when you flip up the lever or hit the button on the dispenser, it activates the proper turbine, which pushes fuel up to the dispenser. For mid-grade, the pump activates both turbines and a mixing valve will combine the proper ratio of hi to low octanes to give the mid grade. If, when you activate the gas pump, you hear a motor running, you are at an antique station. Each of those pumps contain a rotary suction pump. Those suck the fuel out of the tank and then dispense it. Only an older station will have those, the "STP" system is much cheaper and more efficient. <<Boring discussion terminated...>>
One problem with tanks for Hydrogen is that most areas ban above ground tanks of more than a certain capacity (100 gal or so). At least a tank leak would be less contaminating than a petrol leak.
Derswede
fuel for cars. The main feed was your normal gas main. At the station, there was a compressor to allow a steady flow of gas at rated volumes (do not remember that number). Self sealing fittings were used for fuel transfer. The local cabbies loved it, as it was cheaper than petrol. Tank was the big problem, it took up space that could be used for luggage, etc. Tanks were trunk mounted to protect them in case of an accident. Lots of local trucks, buses and the taxis were converted. It has been a couple of years since I have been back, but a quick search shows that it is still commonly used.
At a typical fuel station, you have two main tanks in the ground....one Hi test, one low test. An "STP" (submerged turbine pump) is in each tank, so when you flip up the lever or hit the button on the dispenser, it activates the proper turbine, which pushes fuel up to the dispenser. For mid-grade, the pump activates both turbines and a mixing valve will combine the proper ratio of hi to low octanes to give the mid grade. If, when you activate the gas pump, you hear a motor running, you are at an antique station. Each of those pumps contain a rotary suction pump. Those suck the fuel out of the tank and then dispense it. Only an older station will have those, the "STP" system is much cheaper and more efficient. <<Boring discussion terminated...>>
One problem with tanks for Hydrogen is that most areas ban above ground tanks of more than a certain capacity (100 gal or so). At least a tank leak would be less contaminating than a petrol leak.
Derswede