A peristaltic pump that reduces electrical current flowing through a pumping tube segment includes a central rotor mounted on a central rotation axis, a shoe with a curved surface facing toward the central rotor, multiple rollers mounted along the circumference of the central rotor and the pumping tube segment positioned between the curved surface and the central rotor. Each roller of the plurality of rollers is a member of a roller group, each roller group includes at least two rollers, rollers in a particular roller group are physically located closer to each other than to rollers in other roller groups, and at least two rollers pinch a portion of the pumping tube segment against the curved surface through a full rotation of the central rotor.

A liquid supply system includes a suction lance (6) configured to be inserted into a liquid container (14) and at least one level sensor (10, 12) fixed on the lance (6) and configured to detect a liquid level (22) inside a liquid container (14). A control device (4) is connected to the level sensor (10, 12) and configured to determine a rate of change of the liquid level (22) detected by the at least one level sensor (10, 12) and to detect a lance removal if the rate of change reaches or exceeds a predefined threshold. A method for detecting the removal of a suction lance (6) from a liquid container (14) is provided.

A linear compressor employing a piezoelectric actuator operating in resonance at a frequency substantially below its natural resonant frequency, which is usually of the order of 10 kHz. Low frequency resonance operation of the actuator, of the order of 100 Hz., is achieved by incorporating the actuator and its housing with the moving compression piston, such that the moving mass is substantially increased, and by reduction of the effective piezoelectric stiffness using hydraulic amplification of the actuator displacement. Both these procedures result in a reduction of the actuator resonant frequency. The hydraulic amplification is achieved by using a hydraulic chamber with different sized pistons, linking the actuator motion with motion of the actuator housing, to which the compressor piston is attached. The high efficiency achieved and the lack of moving parts or the need for lubricating oil makes the compressor ideal for use in high reliability and high purity applications.

A liquid supply system includes a suction lance (6) configured to be inserted into a liquid container (14) and at least one level sensor (10, 12) fixed on the lance (6) and configured to detect a liquid level (22) inside a liquid container (14). A control device (4) is connected to the level sensor (10, 12) and configured to determine a rate of change of the liquid level (22) detected by the at least one level sensor (10, 12) and to detect a lance removal if the rate of change reaches or exceeds a predefined threshold. A method for detecting the removal of a suction lance (6) from a liquid container (14) is provided.

The disclosure relates to a three-stage reciprocating compressor comprising pistons and suction and compression chambers in which a medium is compressed for each separate stage, which stages are connected in series and where a first stage is fluidly connected to an inlet for inlet of uncompressed or pre-compressed gas where the three-stage pistons move synchronously along a common axis in one connected unit such that the first and second stage suction and compression chambers share piston as well as cylinder wall, and having separate cylinder heads, a top headpiece and a bottom headpiece on each side of the piston, the third stage piston extending from a center of the first and second stage common piston and is passed through an opening in the cylinder head of the first stage suction and compression chamber, in extension of which is placed a third stage cylinder tube with a smaller diameter than a diameter of the cylinder for stage one and two, each stage fluidly separated by one or more one way valves, where the second stage suction and compression chamber is formed between the cylinder wall and a piston skirt as well as between an underside of the piston and the headpiece placed in a bottom of the cylinder.

A system, method, and computer-readable medium for determining the flow rate and fluid density in an electrical submersible pump (ESP) and controlling the ESP based on the flow rate and density. In one implementation, an ESP system includes an ESP, drive circuitry, a current sensor, a voltage sensor, and a processor. The ESP includes an electric motor. The drive circuitry is electrically coupled to the ESP and is configured to provide an electrical signal to power the ESP. The current sensor is configured to measure a current of the electrical signal. The voltage sensor is configured to measure a voltage of the electrical signal. The processor is configured to calculate speed of a shaft of the electric motor based on a frequency induced by rotation of the motor detected in the current. The processor is also configured to calculate a density of fluid in the ESP based on the speed.

A method of testing a unit pump system performance is disclosed. In one embodiment of the present disclosure, the method of testing a unit pump system performance determines if mechanical and/or electrical stability of a control valve of the unit pump system are achieved before measuring an output injection volume variation.

A process includes obtaining a first set of measurements of an electronic pump operating at a parameter, determining a state value based on the first set of measurements, and determining a reference key based on the state value and the parameter. The process also includes obtaining a second measurement using a second sensor, determining a first threshold, and storing the first threshold in association with the reference key. The process further includes obtaining a second set of measurements including a third and fourth measurement acquired by the first and second sensor. The process further includes determining the reference key based on the third measurement using the function, selecting the first threshold by using the reference key when referencing the data structure. The process further includes determining whether the fourth measurement satisfies criteria based on the first threshold and modifying the electronic pump operation.

A process includes obtaining a first set of measurements of an electronic pump operating at a parameter, determining a state value based on the first set of measurements, and determining a reference key based on the state value and the parameter. The process also includes obtaining a second measurement using a second sensor, determining a first threshold, and storing the first threshold in association with the reference key. The process further includes obtaining a second set of measurements including a third and fourth measurement acquired by the first and second sensor. The process further includes determining the reference key based on the third measurement using the function, selecting the first threshold by using the reference key when referencing the data structure. The process further includes determining whether the fourth measurement satisfies criteria based on the first threshold and modifying the electronic pump operation.

According to some embodiments, system and methods are provided, comprising providing a dual-mode model for a reciprocating compressor, wherein the model includes a measurement mode and a tuning mode; receiving one or more inputs to the model from an operating reciprocating compressor; and in response to receipt of the one or more inputs, executing the model in at least one of the measurement mode and the tuning mode, wherein: in a measurement mode, execution of the model further comprises calculating an actual flow rate of gas in the compressor based on the one or more inputs; and in a tuning mode, execution of the model further comprises calculating one of an unloader setting and a speed set point of a physical element of the compressor for a given flow rate of gas. Numerous other aspects are provided.