The patent-pending Remote Compressed Air System (RCAS) produces instrument air, without electricity, for use in control valve actuators. Field supplied natural gas powers a pneumatic motor equipped with a shaft to drive an air compressor. The compressor pulls air from the atmosphere and provides the line pressure required to allow the pneumatic controller to function as designed. The gas discharged to the atmosphere when the pneumatic controller is actuated is ordinary atmospheric air. The natural gas that drives the pneumatic motor attached to the air compressor is routed back to the field collection system, and is not vented to the atmosphere.
Glycol heat trace systems are commonly used in oil and gas operations to prevent hydrate and ice formation in cold climates. On locations where electricity is not available, pneumatic pumping systems using natural gas are commonly used. For sites without electricity, Aspen Engineering Services has developed a patent-pending pneumatic motor pump system. The pneumatic motor is driven by pressurized natural gas. The natural gas discharging from the pneumatic motor is recycled back to the natural gas compressor, resulting in a zero-emission pumping system.
Reference: Meyer, J. (2016). Remote Compressed Air System, U.S. Patent Application 62/305,750.