Abstract: A pair of strainer systems in parallel provide continuous filtration of solids from an influent stream. In influent strikes a filtration medium in the form of a porous membrane at an angle other than the perpendicular to create a washing action to remove filtrate from the surface of the porous membrane. As filtrate builds up on the surface of the porous membrane, the pressure differential across the strainer increases to a first setpoint which activates a motor which drives a wiper blade to scrub filtrate off the surface of the porous membrane. Ultimately, solids build up within the pores of the porous membrane to a point where the wiper blade is no longer effective to lower the differential pressure across the strainer to an acceptable level. When this happens, a differential pressure signal isolates the operations strainer and places the standby, parallel strainer in service. Filtrate scrubbed from the surface of the porous membrane is collected in a sump and occasionally drained or flushed from the system.

Abstract: A down-hole pump provides positive displacement pump action within a production string of a producing well. The insert pump of the present invention fits within a crossover nipple that is adapted to fit on the end of a production string. The pump seals within an intermediate casing to direct high pressure drive fluid into the pump. The drive fluid directed into the pump passes through a nozzle segment of the pump to develop a high velocity annular flow region. Production fluid is drawn into the nozzle segment at the Vena Contracta of the nozzle to develop the maximum entrainment force by the drive fluid. The combined flow of the drive and production fluids is then directed into a Venturi segment that creates a vacuum condition to increase production flow from the producing structures.

Abstract: A vertical lift aircraft includes a central cabin and a set of concentric, circular, counter-rotating power blade assemblies. Gas turbine engines located in the central cabin provide power for rotating the power blade assemblies to cause lift and motion of the aircraft. The turbine engine exhaust gases are directed through a rotatable exhaust nozzle for aiding in the thrust and momentum of the aircraft. The gas turbine engines drive electric power generators which provide the necessary power for operation of the aircraft.