Explanation of the centrifugal compressor lubrication system

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:) The function of the lubricating oil system is to supply lubricating oil to the machine. To ensure that the temperature, pressure, and flow rate of the lubricating oil meet the required standards, this system consists of a fuel tank, an oil cooler, filters, and a high-level oil tank. The necessary measuring instruments and control instruments have been installed. I) Measurement instruments: The measurement instruments include those for measuring the liquid level in the lubricating oil tank, as well as instruments for measuring oil temperature and oil pressure. Fuel tank level measurement: A dual-color glass plate level gauge is used for on-site measurement and indication. Oil temperature measurement: A bimetallic thermometer is used to provide on-site readings of the temperature before the cooler, before the filter, and of the oil returning to the unit. Oil pressure measurement: A Bourdon tube pressure gauge is used to conduct on-site measurements and provide readings for the oil pump outlet pipe, the lubricating oil main line before the cooler and after the filter, as well as the oil inlet pressure of the unit. II) Control instruments and safety instruments: The main components of control instruments and safety instruments include circuits for tank level alarm, oil pressure regulation, oil temperature alarm, filter differential pressure alarm, start-up of the backup oil pump, alarms, and interlocks. 1) Fuel tank level alarm circuit: The fuel tank level alarm circuit uses a level switch to send signals to the control room; an alarm is triggered when the fuel tank level is below the normal level. The alarm setting value is: 320 mm (from the top of the thread). 2) Oil pressure control circuit: The primary oil pressure control circuit uses a self-acting pressure control valve, PCV40323, which regulates the pressure at the outlet of the oil pump by controlling the pressure before the valve. Adjust the lubricating oil pressure to ensure normal oil pressure in the unit. Set value: Primary adjustment: 1.0 Mpa (G). The secondary oil pressure control circuit uses a self-acting pressure control valve, PCV40341, which regulates the pressure at the outlet of the oil station by controlling the pressure behind the valve. Adjust the lubricating oil pressure to ensure normal oil pressure in the unit. Set value: Single adjustment: 0.28 Mpa (G) 3) Oil temperature alarm circuit The function of the oil temperature alarm circuit is to monitor the temperature of the lubricating oil, with the temperature sensing element sending signals to the control room. It is displayed on the PLC monitor. And it will issue an alarm when the oil temperature is higher than the normal value. Set value: Alarm when oil temperature > 55°C. 4) Filter differential pressure alarm circuit. The function of the filter differential pressure alarm circuit is to monitor the operation of the filter; when the differential pressure across the filter exceeds the normal level, it indicates that the filter needs to be cleaned, and the measuring instrument sends an alarm signal to give a warning. Set value: Alarm when the differential pressure is >0.15 Mpa. 5) Startup of the backup lubricating oil pump, alarm for low oil pressure, and interlock circuit for excessively low pressure. The startup of the backup lubricating oil pump, the alarm for low oil pressure, and the interlock circuit for excessively low pressure are enabled by signals sent from PS40352–40354 and PT40351 to the control room; the startup condition is met when the oil pressure reaches 0.25 Mpa (G) ； When the oil pressure is below 0.15 Mpa (G), an alarm is triggered and the backup pump is activated via interlock ； When the oil pressure drops below 0.1 Mpa (G), a signal is sent to the PLC, which then triggers an interlock to shut down the machine. :loveliness: