🔍 Key Concepts

• Surface finish requirements on a pump shaft for proper operation and seal seating • Difference between minor surface imperfections and severe machining defects • How any surface defect can affect packing, mechanical seals, and bearings

💭 Think About

• Think about how the shaft surface interacts with seals or packing: what happens if the surface is too rough, grooved, or uneven? • Consider whether only one type of surface defect would justify a finishing cut, or whether multiple kinds of defects would create similar problems. • Ask yourself which of these listed defects would interfere with obtaining a smooth, uniform sealing surface on the shaft.

✅ Before You Answer

• Identify which listed conditions would prevent a smooth, uniform contact surface for seals or packing. • Decide whether each condition (roughness, deep ridges, corrugations) would likely cause leakage, wear, or vibration if left uncorrected. • Before choosing, verify whether more than one of these defects would reasonably require a final light machining/finishing pass on the shaft.