Thread Content
Preparations and inspections before the operation of the compressor unit: Answer: 1) The drive motor and gear transmission should be tested separately as well as in combination, and after passing the tests they should be in good condition and ready for use. Install the coupling between the drive motor, the gear transmission, and the compressor, and recheck the alignment of the rotors to ensure it meets all requirements. 2) The cleaning and adjustment of the unit’s oil system have been completed successfully; the oil quality meets the required standards, and the oil storage volume is appropriate. Check the main fuel tank and fuel filter; add fuel if the fuel level in the tank is low. Check the oil temperature; if it is below 24 degrees, use a heater to raise it above 24 degrees. The oil cooler and oil filter should also be filled with oil and of any air removed, and the switching position between the oil cooler and the filter should be set to the side that needs to be in use. Check the main oil pump and the auxiliary oil pump to ensure they are operating properly and in the correct direction. Oil thermometers and pressure gauges should be complete, have appropriate ranges, and function properly. Dry nitrogen is pumped into the accumulator to keep the gas pressure inside it within the specified range. Adjust the pressure at various points in the oil circuit system to meet the design requirements. Check that all interlock devices in the oil system are operating properly to ensure the safety of the unit. 3) The inlet filters of the compressor should be clean and undamaged; the filter elements in the inlet filters have been replaced, and the filters are qualified. 4) The discharge valves of the compressor cylinder and pipelines have been opened to drain the condensate; after it has been drained, these valves should be closed partially, and then fully closed after inflation. 5) Establish a cooling water circulation by introducing water to the intercoolers at various stages of the compressor, remove any air from the system, and bring it into operation. 6) The process piping system should be in good condition; all blind flanges must have been removed and reinstalled. It is not allowed for the expansion, contraction, or vibrations of the pipes to exert any stress on the cylinder body. 7) Adjust the valves on the process gas pipelines to the appropriate positions as required for startup. Generally, the inlet and outlet valves of the compressor should be closed, the reflux valve or vent valve used to prevent surge should be fully open, and the outlet valve of the process system should also be fully closed. The operation of various valves should be smooth and accurate, without any sticking. 8) Verify that safety valves and blast plates on the compressor pipelines and associated equipment are properly installed; the safety valves are calibrated to meet the required standards, and the blast plates meet the specified requirements. 9) The compressors and their associated machinery are equipped with complete instruments, whose ranges, temperatures, pressures, and accuracy levels meet the required standards; important instruments should come with certification of calibration compliance. Check whether the electrical wiring and the instrument air system are in good condition. The control valves must be flexible and accurate, and the automatic control safety system must pass inspections to ensure precise operation. 10) All interlocks of the unit have been tested and adjusted, and all set values meet the requirements. The anti-surge protection control system has passed the calibration tests; all vent valves and anti-surge return valves should operate swiftly without any sticking. 11) Based on the analysis, it has been confirmed that the gas composition within the process system before and after the compressor inlet and outlet valves meets the design requirements, or that the system has been properly purged with nitrogen. 12) Perform a barring test to check whether the unit rotor can rotate smoothly, with no friction or sticking.