Two types of fueling stations have been designed to deliver a composite fuel called Super-Gas™. A “slow fill” station, or called BOB (Bubbling on Board), is the first generation of fuel stations. This design is characterized by being a compact unit. Tests have shown that Super-Gas™ can be formulated at a fast rate (approx 8 minutes) with an acceptable percentage mixture of 54%, 46% liquid sample of CH4 and C3H8 respectively when the vehicle tank is nearly empty (pressure < 100 Psig).
Super-Gas™ made by the “fast fill” station (FFS) can be delivered at approximate 5 to 8 minutes at any vehicle tank pressure. This operation requires the alternative fuel to be made in a separate tank and delivered to the vehicle. Results from the ongoing tests have also shown that by pre-filling the vehicle tank to a certain pressure before refueling, the amount of fuel lost by flashing is reduced. Also, fuel (gases) recovery from the vehicle tank is accomplished with this design. Finally, the attained fuel composition is approximately the same as the BOB station.