Steps to start a centrifugal compressor

Your question is too broad; moreover, different models have varying specific procedures!

What’s written in the rules isn’t that comprehensive

1. The 3.5MPa steam has been introduced to the unit, and the drain valve at the bottom of the 3.5MPa steam drum has been opened. 2. Open the drain valve before the main steam inlet valve and after the backpressure steam outlet valve to drain all water remaining in the pipelines. 3. Feed 3.5 MPa steam to the DN250 isolation valve to warm up the pipelines; once no water is discharged from the drain valve, reduce its opening. At the same time, introduce 1.0 MPa steam to the warm-up line behind the DN300 backpressure isolation valve; after no water is discharged from the drain valve, reduce its opening. 4. Open the drain valve located between the steam inlet isolation valve and the main steam valve, and slowly open the DN40 bypass valve of the turbine steam inlet valve to carry out secondary pipe warming. Once steam is detected at the drain valve, keep the valve with a DN40 diameter open; heat the pipeline for 30 minutes. During this heating period, close the drain valve gradually once no water more flows out of it. 5. Open the machine’s drain valve, and slowly open the Dg50 bypass of the backpressure steam outlet check valve to introduce 0.5 MPa of steam into the turbine for warming up. 6. Press the reset button on the on-site turbine control panel. 7. Rotate the start valve in the quick-shut assembly 90 degrees clockwise; once the start oil pressure reaches 0.8 MPa, the emergency shutdown throttle hook is activated and the emergency safety device handle is lifted. 8. In the quick-shut assembly, rotate the quick-shut valve 90 degrees counterclockwise until the quick-shut oil pressure reaches 0.8 MPa. 9. Rotate the start valve in the quick-shut assembly 90 degrees counterclockwise; the start oil pressure returns to 0, and the secondary oil pressure reaches 0.15 MPa. At this point, the quick-close valve opens, and steam reaches the control valve. After the machine has discharged all water, reduce the drain valve opening. 10. Slowly open the steam inlet valve, while simultaneously slowly closing the DN40 bypass valve, until the steam inlet valve is fully open and the bypass valve is fully closed. Pay attention to the steam pressure when opening the valve. 11. Adjust the opening of each drain valve so that water can be drained without any scalding liquid being sprayed out. 12. At this point, a small amount of steam has entered the turbine; check whether the turbine’s expansion is normal and whether the bearing temperatures are within the normal range. 13. --Install the steam seal: 1) Open the inlet and outlet valves of the steam seal cooler to activate it. 2) Open the drain valve before the vacuum steam inlet valve of the steam seal cooler to remove any accumulated water, and then close the drain valve partially after all water has been drained. 3) Introduce 1.0 Mpa steam to the steam seal extractor to control the vacuum level at 0.03 Mpa. 4) Open the valve that supplies cooling steam to the steam seal. 14. Confirm once again that the unit meets the following startup conditions, then press the reset button on the indoor control panel. 15. On the speed control screen of the compressor control system, press the “Cold Start” button; after a dialog box appears, select “Cold Start” and then click “OK”. At this point, “Cold Start” will be displayed among the startup options on the right side of the screen. 16. On the speed control screen of the compressor control system, press the “Manual Control” button; after a dialog box appears, select “Automatic Control” and then click “OK”. At this point, the turbine’s governor takes over automatic control, and the unit will accelerate according to the acceleration curve. At this time, “Automatic” is displayed in the current status on the right side of the screen. Click the “Start” button on the screen, and the unit begins to start up. 17. The system’s target speed is 800 rpm, and the unit accelerates according to the predetermined acceleration curve. Start the first warm-up upon arrival. Warm-up time: 5 minutes. 18. After the unit reaches a speed of 800 rpm, check the expansion amount of the unit’s cylinders, as well as the temperature and vibration in various parts of the turbine, and listen for any abnormal noises. Observe at the oil return pipe sight glass whether the oil level and oil return temperature are normal. After 19.5 minutes, the unit automatically enters the speed-up phase, with a target speed of 8071 rpm. 20. Check the cylinder expansion amount again, inspect the temperatures and vibrations of various parts of the turbine, and look for any abnormal noises. Check whether the return oil flow is normal. 21. Once the speed reaches 8071 rpm, the controller shifts from warm-up mode to operating mode; thereafter, the set value can be changed by clicking on SP to control the speed ； 22. The unit operates at 8071 rpm; check the expansion of the turbine, the vibration of the unit, the temperature of the bearing shells, the shaft displacement of the unit, the key phase, and whether there are any abnormal noises from the unit. 23. When the speed exceeds 8071 RPM, it is possible to manually set the compressor’s speed value in order to control it; the opening degree of the anti-surge valve and the compressor outlet valve can also be adjusted to optimize the compressor’s operation. 24. Once the speed reaches 3000 RPM, slowly reduce the opening degree of the backpressure steam vent control valve in order to increase the exhaust pressure. When the pressure is slightly higher than that of the backpressure steam pipeline network, slowly open the DN300 backpressure steam valve until it is fully open. Be careful not to affect the pipeline network pressure. Next, close the backpressure steam vent control valve, shut off the drain valve on the backpressure steam pipeline, and reduce the drain flow from the compressor unit by 25. The operator inside the room manually and slowly reduces the anti-surge control valve based on the compressor’s operating point, stopping this process once the compressor’s operating point approaches the anti-surge line. 26. If the pressure at the compressor outlet is high, the valve leading from the compressor outlet to A2251 can be opened appropriately. 27. When the unit is operating at around 9000 rpm, check the degree of expansion of the turbine, as well as the unit’s vibration, bearing temperatures, shaft displacement, key alignment, and whether there are any abnormal noises. Inspection items during unit operation: 1. Monitor equipment vibration, bearing temperatures, shaft displacement, and phase through the control system. 2. Operators should observe on-site during operation to check for normal levels of vibration and temperature, as well as proper steam pressure and temperature, and to detect any abnormal sounds from the bearings or the unit itself. Record the temperature of each bearing, the oil pressure at various points, as well as shaft displacement and shaft vibration every half hour. 3. Check at the sight glass on the return oil pipe to see whether the oil level and return oil temperature are normal. 4. Verify that the expansion washers of the turbine’s cat claw bolts can move freely (free movement indicates normal operation). ●Main risks: 1) Surging may occur when increasing the speed of the compressor ； 2) Absorption stability: Leaks occur during temperature and pressure increase. ●Control and preventive measures: 1) Slowly increase the speed of the compressor; once the outlet pressure exceeds the absorption stabilization pressure, slowly open the outlet valve to integrate it into the system ； 2) The absorption and stabilization process during voltage and temperature increases is slow; on-site personnel should conduct continuous inspections, and in the event of a leak, they must promptly assist in tightening the connections. Is this appropriate?

The problem lies in step six: first, rotate the quick-shut oil clockwise to release the system pressure, then sequentially establish the start-up oil and the quick-shut oil, and finally adjust the control oil (if the pressure is not released, the quick-shut oil cannot be established after the start-up oil is set up)

Look, as long as it’s 1842 or 1843, it definitely won’t work