A mobile compressed natural gas (CNG) vessel and unloader are used to supply CNG to a compressor during regulatory emissions testing of the compressor (e.g., U.S. EPA's Quad J testing). CNG output by the compressor is recirculated to an inlet of the unloader so that it is reused during the emissions testing. Lean CNG from the vessel may be used to power the compressor during the testing. The unloader ensures that the compressor is run at at least a predetermined load factor during the emissions testing.

The invention is a pump engine developed for the purpose of launching and pumping capsules in a hydraulic pipeline. The engine operates on the combustion and explosion of a mixture of fuel and oxygen bearing gases against a liquid piston that passes through a dynamic current turbine. The rotation of the turbine maintains a constant direction of rotation through the oscillation of the water column, and drives a special rotor to feed capsules from a hopper into the pipeline, while the liquid piston pushes them into the pipeline and applies the necessary pressure. The turbine also drives the necessary auxiliaries such as alternator and camshaft for water valves and air inlet and exhaust valves. The pump engine is built in single cylinder or multiple cylinders in duplex and fourplex configurations.

Aspects are provided for positive displacement pumps and methods and systems for remotely controlling such positive displacement pumps via a network. An application server receives, from a registered user, a selection of an operation program for the positive displacement pump, the operation program including control commands to control a drive motor of the pump. The application server sends the program to a network hub to publish the control commands to the pump, wherein the pump retrieves the control commands from the network hub. The application server stores a record of the control commands associated with the registered user. The application server receives operation parameters from the pump and stores the operation parameters in association with the registered user. The application server evaluates the operation parameters according to defined conditions. The application server transmits an alert to a registered user, for example.

A mobile compressed natural gas (CNG) vessel and unloader are used to supply CNG to a compressor during regulatory emissions testing of the compressor (e.g., U.S. EPA's Quad J testing). CNG output by the compressor is recirculated to an inlet of the unloader so that it is reused during the emissions testing. Lean CNG from the vessel may be used to power the compressor during the testing. The unloader ensures that the compressor is run at at least a predetermined load factor during the emissions testing.

A method for controlling a pumping system includes a pump, a pump motor, a generator that provides power to the pump motor and an engine that drives the generator. The method includes the steps of operating the pump at a first operational speed, detecting a transient high load event, reducing the speed of the pump to a second operational speed, detecting the end of the transient high load event, and increasing the speed of the pump to the first operational speed.

A rod-pump control device is disclosed. The claimed rod-pump control device uses fuel or air usage for gas units, and can use pressure. The sensors work as the primary trigger to indicate a pump-off condition on an oil and gas well. These sensors can be used as stand-alone triggers or in conjunction with other sensors to more accurately monitor pump efficiency. When the pump-controller starts to indicate an inefficient pump condition, it will remove power to disengage an electric clutch or send a signal to an engine controller to stop. An adjustable algorithm will use percentage change of off time, dependent on actual run time compared to a user definable target time to keep the pump operating at peak efficiency.