A method for chemical treatment includes operating a chemical pump having a flow rate capacity of a selected multiple of a flow rate of a chemical required to treat at least one of a well and surface equipment associated therewith. The operating is performed at at least one selected time and for at least one selected duration inversely proportional to the flow rate capacity such that a volume of the chemical pumped in a predetermined time interval substantially equals a required volume of the chemical during the predetermined time interval.

This disclosure generally relates to an automatic bicycle, particularly to a hydraulic automatic transmission bicycle which can automatically and adaptively change gear ratios. More particularly, this disclosure relates to those hydraulic automatic transmission bicycles which use fluid pressure to change such gear ratios, and which include various hydraulic automatic transmissions which may be provided in various configurations and may operate in various methods and sequences to provide automatic and infinitely variable gear ratios.

A fuel supply device according to the present invention comprises a first fuel pump for forcing fuel from a fuel tank to a fuel passage, a first electric motor for driving the first fuel pump, a second fuel pump for forcing fuel from the fuel tank to the fuel passage, a second electric motor for driving the second fuel pump, a supply flow rate sensor for detecting flow rate in the supply passage, and a control device for controlling the flow rate in the supply passage to follow a desired value thereof, by regulating rotational speeds of the first and second electric motors depending on a difference between the desired value and a detected value of flow rate in the supply passage.

This disclosure relates to a system for reducing cavitation at a surface that moves relatively with respect to a first fluid. The system comprises a degasser configured to at least partially degas a second fluid. The system also comprises a reservoir in communication with the degasser and configured to house the at least partially degassed second fluid, the reservoir having an outlet that is arranged for directing the second fluid towards the surface. The system is configured such that the directing of the at least partially degassed second fluid towards the surface forms a boundary layer at the surface. The boundary layer is adapted to at least partially increase the negative pressure required to initiate cavitation at the surface so as to reduce the occurrence of cavitation during such relative movement.

A pumping system includes a primary suction tank including a first pressure sensor operatively connected to a first portable suction control for measuring a first pressure of a fluid coming from the primary suction tank, and a first flow meter operatively connected to the first portable suction control for measuring a first flow rate of the fluid coming from the primary suction tank, wherein an output of the primary suction tank is controlled by a first valve, a secondary suction tank, a rig pump operatively connected to the primary suction tank, and the secondary suction tank, and a rig stand pipe connected to a drilling well, and a controller operatively connected to the first portable suction control, the first valve, and a second flow meter configured to measure a second flow rate of the fluid coming out of the rig pump.

A lease automatic custody transfer (LACT) system includes a pump assembly and meter system. The pump assembly is configured to pump a volume of fluid out of a storage container into a conduit. The pump assembly causes a pulsating flow of the volume of fluid through the conduit. The meter system is coupled to the conduit and includes a meter device and a processing system. The meter device is configured to obtain a plurality of measurements corresponding to the volume of fluid flowing through the conduit. The processing system is communicatively coupled to the meter device and configured to determine a flow parameter value based on the plurality of measurements.

The present disclosure provides apparatuses and methods related to a high pressure processing device that is configured to simplify batch processing. In an embodiment, a high pressure processing device includes a processing module configured to reduce a particle size of a material or achieve a desired liquid processing result for the material, a pump configured to pump the material to an inlet of the processing module, a recirculation pathway configured to recirculate the material from an outlet of the processing module back to the pump, an input device configured to receive at least one user input variable, and a controller configured to (i) determine a number of pump strokes for the pump based on the user input variable, and (ii) control the pump according to the determined number of pump strokes so that the material makes a plurality of passes through the processing module.

A system (10) for treating produce includes an application system (12) for applying a treatment liquid to the produce. A piston pump (20) is connected in liquid flow receiving communication with a source of treatment liquid (16), and also is connected in liquid flow expelling communication with an application line (18) leading to the application system. A control system (22) controls the operation of the piston pump to pump a selected dosage of the treatment liquid from the source of treatment liquid (16) to the application system (12).

A system for detecting dry running of a pump includes an inlet device to an intake device of the pump for taking in an electrically conductive liquid, and an electrical resistance structure (20) arranged in the inlet device. The electrical resistance structure has a variable resistance value, dependent on wetting with the electrically conductive liquid.

The present invention concerns a method of controlling a liquid volume which can be conveyed with a metering pump in a given time, comprising the steps: a. providing an input signal for controlling the liquid volume which can be conveyed with the metering pump in the given time, and b.lLinking the input signal to an actuating signal which influences the liquid volume which can be conveyed with the metering pump in the given time so that a change in the input signal leads to a change in the actuating signal and thus a change in the liquid volume which can be conveyed. To react to individual process demands it is proposed according to the invention that linking in step b. is effected in such a way that a change in the input signal leads to a change in the liquid volume which can be conveyed with the metering pump in the given time, which change in the liquid volume is non-proportional to the change in the input signal.