Abstract: In a combined liquid natural gas and compressed natural gas fueling station, liquid natural gas is stored in a cryogenic tank and dispensed to vehicles on demand. Compressed natural gas is produced on demand from the liquid natural gas by a high-efficiency pump and vaporizer system and dispensed directly to vehicles or stored for later dispensing. For greater efficiency, the pump and vaporizer system is powered by combustion of natural gas, including gas bled off to relieve pressure from the cryogenic tank.

Abstract: There is provided an improved coiled tubing injector for injecting and withdrawing a length of flexible, cylindrical tubing into and from a well bore. The improved injector comprises first and second sets of gripper shoes, and drive mechanism for moving the sets of gripper shoes around first and second endless paths, respectively. The endless paths include parallel sections disposed on opposite sides of a length of the tubing. Within these parallel sections, the gripper shoes are pressed against the tubing with sufficient force to hold the tubing therebetween. Each gripper shoe includes a base portion connected to the drive mechanism and at least two substantially nondeformable gripper elements, each having cylindrical gripping surfaces corresponding to the outer surface of the tubing. A body of elastomeric material connects the gripper elements to the base portion and permits movement of the gripper elements between open and closed positions.

Abstract: An LNG refueling facility includes a nozzle for mating with the receptacle on a motor vehicle to deliver a flow of LNG to the vehicle's tank. The nozzle is supplied with a flow of dry gas to purge moisture-laden air from around surfaces which mate with the receptacle to prevent freezing of moisture on the mating surfaces when the nozzle turns very cold. The nozzle also includes a boot enclosing mechanical linkages for latching the nozzle to the receptacle. Dry gas is supplied to the interior of the boot to displace air from around the mechanical linkages and thereby prevent moisture from freezing onto the mechanical linkages.