Turbine, up and down cat paw conversion

To switch the turbine from lower catfoot support during maintenance to upper catfoot support during operation, it is first necessary to ensure that all maintenance or repair work on the unit has been completed and that all components of the unit are in good condition. During the conversion process, the operator must follow these steps: 1. Ensure that the turbine bypass valve is closed to prevent any accidents during the conversion. 2. Slowly raise the turbine until it is completely free from the lower cat claw. 3. Check whether the position of the upper cat paw is correct to ensure stable support for the turbine. 4. Slowly lower the turbine so that it lands safely on the upper catwalk. 5. After completing the conversion, conduct a thorough inspection to ensure that the turbine is in the correct position on the upper catwalk and is securely supported. The main criteria for successful conversion are: – The turbine is mounted on the upper catwalk without any noticeable shaking, and is in the correct position. - By conducting tests and relevant inspections, it was confirmed that the turbine is operating smoothly, with no abnormal noises or vibrations. - Ensure that all connectors, fasteners, etc. are installed correctly, with no looseness or air leaks. Once these conditions are met, it can be considered that the conversion was successful and satisfactory. .

After switching between upper and lower cat paw modes, which data needs to be retested? What other data are there regarding the coaxiality of the rotor and the cylinder block, as well as the coaxiality of the rotor and the bearing housing?

After the transition between upper and lower cat paw positions, to ensure the safe and stable operation of the turbine, it is necessary to re-measure the following parameters: 1. Coaxiality of the rotor and the cylinder: Ensure that the coaxiality between the rotor and the cylinder meets the technical requirements, in order to avoid vibrations or wear caused by deviations in coaxiality. 2. Coaxiality of the rotor and bearing housing: Check and verify the coaxiality between the rotor and the bearing housing to prevent bearing overload or damage. 3. Rotor balance: Check the balance of the rotor; an unbalanced rotor can cause additional vibrations during the operation of the unit. 4. Bearing temperature and vibration monitoring: Monitor the temperature and vibration of each bearing to ensure they remain within normal ranges and to detect any abnormalities early. 5. Sealing clearance: Check whether the sealing clearances at each level meet the technical specifications to ensure the sealing performance of the unit. 6. Axial position: Verify that the axial position of the rotor is correct to prevent operational issues caused by axial displacement. 7. Valve operations and control systems: Check the opening and closing status of each valve, as well as whether the control systems are sensitive and accurate. 8. Pressure and flow rate: Test the operating pressure of the turbine and the flow rate through various sections to ensure that the design requirements are met. 9. Operating electrical parameters: Monitor parameters such as current and voltage when the motor is driven to ensure normal operation of the motor. By ensuring that all the above data meet the technical specifications and requirements, the safe and stable operation of the turbine can be effectively guaranteed. .

Before starting the maintenance work on the lower cylinder, it is secured using the lifting screws located on the lower cylinder; thereafter, the upper cylinder is removed. After the maintenance is complete and the upper cylinder is reinstalled, the bolts used to lift the lower cylinder are loosened. To clearly monitor any changes in the position of the lower cylinder during maintenance, markers can be placed on the frames attached to the lifting devices on both sides of the lower cylinder, allowing for constant monitoring of its displacement. Generally, once it is properly secured, there should be no issues. When reinstalling the rotor, it is sufficient to check again the concentricity between the stator and the rotor; this approach is usually the most straightforward.