What are the mistakes in these narratives?

Thread Content

1. Compare the measured clearance of the circular bearing shells in a centrifugal compressor with the standard clearance values; if it exceeds the upper limit of the standard value, new bearing shells must be installed. 2. To reduce the axial dimension of the centrifugal compressor rotor, thrust bearings are often combined with sliding bearings to form radial-thrust combined bearings. 3. The radial thrust combined bearing of a centrifugal compressor is mainly composed of support bushings, support bushing housings, thrust bushings, and thrust bushing housings. 4. The tungsten alloy bearing surface of the centrifugal compressor must fit tightly against the substrate; after being immersed in kerosene for 20–40 minutes, it should be taken out and dried. A layer of red lead should be applied at the junction between the tungsten alloy and the substrate, and after 10–20 minutes, the red lead should not change color. 5. When parameters such as the lubricating oil temperature, pressure, pressure difference, and level of the centrifugal compressor reach the set values for acoustic and optical alarms, all corresponding acoustic and optical alarm signals are generated.