Abstract: A system and method for unloading highly pressurized compressed natural gas from transport vessels by depressurizing the gas through flow lines linking a series of automated flow control valves that lower the gas pressure to a predetermined level, the valves being linked in series with and separated by heat exchangers in which the lower pressure gas flowing through the system is also reheated to a predetermined temperature by a heat exchange medium recirculation system in which the heat exchange medium is reheated by a heat source that can be internal to the system. The use of a minor portion of the depressurized and reheated gas as fuel gas to reheat the heat exchange medium is also disclosed. The subject system can be skid-mounted if desired.

Abstract: Processes and systems are described, which provide important advantages in filling gas storage vessels, such as gas cylinders for the transport of compressed natural gas (CNG). For example, the flow of gas from the fill station may be terminated safely, using an auto-fill shut-off mechanism, without the risk of exceeding vessel pressure ratings and overall reduced risk of operator error. The automatic termination of flow can occur at a preselected pressure that may, for example, be set at a fixed value, or may otherwise be adjusted based on the local temperature at the time of the fill.

Abstract: A system and method for unloading highly pressurized compressed natural gas from transport vessels by depressurizing the gas through flow lines linking a series of automated flow control valves that lower the gas pressure to a predetermined level, the valves being linked in series with and separated by heat exchangers in which the lower pressure gas flowing through the system is also reheated to a predetermined temperature by a heat exchange medium recirculation system in which the heat exchange medium is reheated by a heat source that can be internal to the system. The use of a minor portion of the depressurized and reheated gas as fuel gas to reheat the heat exchange medium is also disclosed. The subject system can be skid-mounted if desired.

Abstract: Processes and systems are described, which provide important advantages in filling gas storage vessels, such as gas cylinders for the transport of compressed natural gas (CNG). For example, the flow of gas from the fill station may be terminated safely, using an auto-fill shut-off mechanism, without the risk of exceeding vessel pressure ratings and overall reduced risk of operator error. The automatic termination of flow can occur at a preselected pressure that may, for example, be set at a fixed value, or may otherwise be adjusted based on the local temperature at the time of the fill.

Abstract: A dual service system and method for selectively compressing and dispensing methane, hydrogen, and variable mixtures of methane and hydrogen for use as a gaseous fuel. The use of an in-line gas density meter, hydraulic intensifier, pressurized gas cooler, optional intermediate storage and multiple dispensers are disclosed. An inline gas density meter is used in combination with a programmable logic controller and a control valve on the hydrogen supply line to create a closed feedback loop for selectively controlling the hydrogen content of the resultant pressurized fuel gas.

Abstract: A system and method for dispensing pressurized gas, especially CNG, in which the temperature inside the receiving tank is preferably monitored and is used by a computer to adjust the fill pressure to compensate for the temperature and pressure rise attributable to adiabatic compression of the gas inside the receiving tank. The system also utilizes the temperature and pressure of the receiving tank to calculate the volume of gas dispensed.

Abstract: A system and method for selectively refueling a plurality of vehicle storage tanks with compressed natural gas (CNG) are provided that utilize a compressor system operable at suction pressures ranging from about 330 to about 3600 psig and discharge pressures ranging from about 330 to about 4500 psig in combination with a tank for temporarily storing CNG at an intermediate storage pressure of from about 330 to about 4500 psig, preferably from about 1700 to about 2700 psig, apparatus for selectively filling vehicle storage tanks with CNG from an inlet source, from the compressor discharge and from the intermediate storage tanks, and apparatus for selectively supplying CNG to the compressor inlet at either the available line pressure or the intermediate storage pressure.

Abstract: A system and method for refueling vehicle storage tanks with compressed natural gas (CNG) are provided that utilize a single stage compressor operable at suction pressures ranging from about 330 to about 3600 psig and discharge pressures ranging from about 330 to about 4500 psig in combination with a temporary storage tank for CNG at an intermediate storage pressure of from about 330 to about 4500 psig, preferably from about 1700 to about 2700 psig, selectively filling vehicle storage tanks with CNG from an inlet source, from the compressor discharge and from the intermediate storage tanks, and selectively supplying CNG to the compressor inlet at either the available line pressure or the intermediate storage pressure.