Provided is an inspection method for a liquid feeding device capable of preventing an increase in the number of components, a decrease in throughput, and an increase in a leakage source. The method includes: suctioning a fluid from a fluid tank into a first cylinder by driving a first plunger in a suction direction; driving the first plunger in a discharge direction after suction; stopping the first plunger for a predetermined first time; driving the first plunger in the discharge direction; and estimating a leakage amount in a flow path on an upstream side of a second check valve based on a detection value of a pressure detected by a pressure sensor from start of the driving of the first plunger in the discharge direction to end of the driving of the first plunger in the discharge direction.

The application relates to a method for monitoring a hydraulic system including several hydraulic components, the hydraulic system comprising at least one pump and subsystems which can be shut off from one another and each have a hydraulic motor and/or a hydraulic cylinder as consumers. According to the application, leakage in the pump and in the subsystems is determined and, on the basis thereof, leakage in the consumers is subsequently determined. These values can be used to determine the efficiencies of the pump and the consumers.

A peristaltic pump is provided comprising a drive unit, a pumphead comprising a pressing element. The pumphead is connectable to the drive unit such that, when connected, the pressing element is driveable by the drive unit to exert a peristaltic action on a tube arranged within the pumphead. The pumphead further comprises an optical sensor, wherein the optical sensor comprises an emitter and a receiver which are mounted on the drive unit and a reflector element mounted on the pumphead. The reflector element is arranged on the pumphead such that when the pumphead is connected to the drive unit, radiation emitted by the emitter is reflected by the reflector element towards the receiver.

One or more systems are disclosed for leak detection for a pump that include a reservoir having a chamber with an inlet and an outlet. The inlet is configured to couple to an exhaust of a pump and the reservoir is configured to create a vortex flow therein. An optical sensor is positioned at a bottom of the reservoir with a detecting portion of the optical sensor extending into the chamber. The vortex flow causes one or more liquids to settle at the bottom of the reservoir on the optical sensor. The one or more liquids are indicative of a leak and the optical sensor is configured to detect the one or more liquids.

A system for pumping a fluid into a sub-surface formation to pressurize the sub-surface formation using a pump having a shaft. The system includes a mechanical seal removably installed in the pump and a mechanical seal integrity testing rig configured to be pressed against the mechanical seal and to test an integrity of the mechanical seal. The mechanical seal removably installed in the pump comprises a mechanical seal sleeve delineating a conduit configured to receive the shaft of the pump and a bottom end and a mechanical seal flange. The system further includes a mechanical seal integrity testing rig configured to be pressed against the mechanical seal and to test an integrity of the mechanical seal. The mechanical seal integrity testing rig comprises a testing rig sleeve having a top end of testing rig sleeve and a bottom end of testing rig sleeve and a mechanical seal sleeve blind.

A diaphragm compressor having a compressor head with a hydraulic fluid plate having a fluid plate contact plane and a process fluid plate having a process plate contact plane, the plates forming a compression chamber when contact therebetween is established, the compression chamber being divided in an upper chamber and a lower chamber by a multi-layered diaphragm, where a controller is configured for controlling an alternating movement of the multi-layered diaphragm towards the upper and the lower chambers respectively, a process fluid plate seal is positioned in a process fluid seal groove provided in the contact plane, the process fluid plate seal forms a process fluid seal between an upper side of the multi-layered diaphragm and the contact plane, and the process fluid plate includes a process fluid leak groove system fluidly connected to a process fluid plate leakage passage provided in the process fluid plate.

A pump system can include a tube disposed about a rotor. The rotor can be configured to drive fluid through the tube as the rotor rotates. The tube can be replaceable when the tube fails. The pump system can include a processor configured to determine a predicted number of revolutions of the rotor before the tube fails based on a number n of past tube failure detection (TFD) events. Each past TFD event can have a corresponding n.sup.th TFD value based at least in part on the number of revolutions the rotor had rotated before the tube failed. When n=0, the predicted number of revolutions can be set to a putative value, and when n=1, the predicted number of revolutions can be based at least in part on the first TFD value and the putative value.