🔍 Key Concepts

• Function of carbon ring packing on a turbine rotor shaft • Relationship between segment end clearance and shaft protection • How improper fitting can lead to shaft scoring or excessive leakage

💭 Think About

• What exactly changes when you file the ENDS of the ring segments: the gap between the ends, or the clearance to the shaft? • How does too little or too much end clearance affect the ring’s ability to ride on oil and protect the shaft? • Which option talks about a direct consequence of improving the fit of the segment ends rather than changing overall ring-to-shaft clearance?

✅ Before You Answer

• Distinguish between end clearance (between segment tips) and radial clearance (between ring and shaft) • Consider which condition would most likely increase risk of metal-to-metal contact with the shaft • Ask whether filing is done to make the ring tighter on the shaft, or to ensure proper gap and free movement of the segments