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Preparation before start-up It is recommended to add a temporary inlet filter during commissioning and remove it after approximately 50 hours of operation. The lubricating oil circulation unit has an independent thin oil station to establish a lubrication system. Before starting, add a sufficient amount of ISO VG68 lubricating oil, based on the height of the fuel tank sight glass. The oil pump is a gear pump type that supplies oil to the coupling rod/crankshaft assembly, bearings, and crosshead. Lubricating oil pressure is controlled by a spring-adjusted relief valve mounted on the pump. Usually the pressure at startup should be 5 bar gauge, and the working pressure should be in the range of 3-7 bar gauge depending on the ambient temperature. The lubricating medium passes through a double filtration system: A 110 micron filter installed in the crankcase. A replaceable 25 micron paper cylindrical filter, or an additional option, a dual parallel filter. The compressor's lubricating oil system is usually monitored by a low oil pressure switch connected to the motor control cabinet. The switch is set at 2.8 bar gauge pressure. The control system must set a time of approximately 8 seconds to wait for oil pressure to build up during startup. oil cooler * Shell type, cooling water goes through the tube side and oil goes through the shell side. The oil should be changed after 50 hours of first use, and after the 5000th hour or every year. For double-acting compressors, it is possible to vary the flow rate according to system requirements. Therefore, the compressor can operate at zero flow (0%), half the design flow (approximately 50%), or full design flow (100%). The flow rate can only be adjusted if it is specified in the order contract. The basic system consists of a set of servo valves installed at the inlet. The system can be adjusted by two solenoid valves (normally open) and the air pipe. Usually a pressure reducing valve is required at the inlet of the gas (working pressure set to 7b.g). For some reason zero flow is necessary for operation. The two solenoid valves SOV1 and SOV2 are de-energized. Therefore, the inlet valve will open to zero flow. If only half of the design flow is required, only one of the two solenoid valves SOV1 and SOV2 will be closed. Therefore, one action of the compressor is eliminated. When full flow is required, both valves operate. It is worth noting that if it is only in half flow mode, it cannot run for a long time due to the increase in temperature. At the same time, the flow can also be adjusted by the following means: Regulating valve with bypass or adjustable motor speed. The compressor cylinder should be unloaded when both solenoid valves are closed. Gas circulation When the gas is compressed, the temperature will rise. In order to obtain an acceptable gas outlet temperature, a gas cooler is installed in the outlet line of the compressor. Coolers are usually of shell-and-tube type: The gas is in the middle pipe, and the water is between the shell and the middle pipe, flowing in reverse direction for cooling. Cooling water circuit To remove the heat generated by compressing the gas, the compressor is cooled by a cooling water circuit. Perhaps an open circuit with the unit cooling water, or a closed circuit including a heat exchanger with a circulation pump or a radiator and fan. If the compressor is on standby in a sub-zero environment and "open" circuit cooling is used, the cooling water system must be completely drained, including the plugged lower part of the cooling water side of each compressor cylinder, and the cooling water on the oil cooler side and plugged end. Debugging and degreasing In normal environments, the following components are treated with anti-corrosion treatment: • Cylinder • Piston + Piston Rod • Cylinder Liner • Valve + Valve Seat • Crankshaft and Bearings Therefore the compressor must dismantle these parts to degrease them individually, these parts must be degreased with a suitable solvent, all parts must be free of water stains before reassembly. The preservatives in the crankcase are compatible with common lubricants. If mineral oil is used, the crankcase does not need to be cleaned. Prelubrication When the compressor has not been running for a long time, prelubrication is necessary. Run the lean oil station until the pressure can be read on the pressure gauge. Startup After the compressor has been debugged as described in the previous section, the compressor can be started according to the following detailed description. The compressor may or may not be suitable for automatic operation, but regardless of automatic or manual operation, the starting sequence is as follows: Check that the pneumatic turning ratchet device has been disassembled ； Turn on the cooling water. Make sure the compressor starts without load. Start the compressor motor and check its rotation. After 8-10 seconds, the compressor oil pressure and cooling water flow will rise to normal conditions. The oil pressure switch and cooling water flow switch should be skipped during the initial stage of startup. Slowly open the outlet regulating valve. Check oil pressure, air pressure, temperature, noise and vibration. Check that the automatic condensate drain (if installed) is functioning properly. Check the production rate by closing the manual condensate blowdown valve and check that the maximum blowdown time interval is reached to avoid overflow. To stop the compressor, follow the steps below:: Unload the compressor. Turn off the motor. When conveying hazardous and/or corrosive gases, the compressor system should be replaced with dry nitrogen if the compressor will remain out of service for an extended period of time. If the compressor is stopped at temperatures below zero, the cooling water system should be completely drained (especially the oil cooler, if installed). If out of service for a long period of time, the compressor should be run for at least 1 hour every 14 days. If starting conditions are not met, manually rotate the crankshaft/flywheel to prevent deformation of moving parts.

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