A lubricating oil purification system for purifying a stock solution mixed with ammonia water into lubricating oil, the lubricating oil purification system includes: an engine; a lubricating oil purifier configured to separate a stock solution containing the lubricating oil used in the engine into a light liquid which is at least the purified lubricating oil and a heavy liquid containing ammonia; and a water supply unit configured to supply water into a separation chamber during operation of the lubricating oil purifier.

Systems, apparatuses, and methods are provided for implementing a system for providing a breather for a reservoir. The system includes a breather including a housing a dehumidifying element therein. The system further includes an operational sensor positioned within the housing, the operational sensor configured to output a sensor signal indicative of a measured operational parameter of the breather, and an expansion pack coupleable to the housing, the expansion pack is configured to receive the sensor signal indicative of the measured operational parameter and to transmit at least one of the measured operational parameter or a representation thereof. The system includes a control unit communicatively coupleable to the expansion pack having a processor, a display unit, and a storage. The processor executes a control application configured to receive the at least one of the measured operational parameter or representation thereof.

An oil circulation system is configured to supply lubrication oil to a plunger pump. The oil circulation system includes an oil tank, and the oil tank is provided with an electric heater. The oil circulation system further includes: a main circulation circuit. Two ends of the main circulation circuit are configured to respectively communicate with an oil outlet and an oil inlet of the oil tank, and the main circulation circuit is provided with a power member, and an overflow valve, disposed on the main circulation circuit and located on an oil outflow side of the power member.

A quality diagnostics system for lubricant/coolant fluid includes a lubricant supported electric motor including a stator and a rotor defining a gap therebetween, with the lubricant/coolant fluid disposed in the gap for supporting the rotor while allowing the rotor to rotate relative to the stator. An inverter includes a plurality of power switches configured to supply an alternating current (AC) power to the motor for driving the rotor to rotate. A passageway conveys the lubricant/coolant fluid between the motor and the inverter. A lubricant quality sensor includes a set of sensor plates disposed along the passageway, an excitation source configured to apply an AC excitation voltage to a first sensor plate, and an electrical sensor configured to measure a response to the AC excitation voltage. A controller determines, based on a sensor signal from the electrical sensor, at least one of metal contamination and water contamination in the lubricant/coolant fluid.