🔍 Key Concepts

• How packing in a centrifugal pump prevents leakage and relies on cooling/lubrication • What happens to packing material when it overheats from friction • The difference between mechanical causes (movement, seating) and lubrication/adjustment issues

💭 Think About

• Which condition would most likely cause excessive friction and heat right at the inner circumference where the shaft runs? • How would too loose vs. too tight packing affect temperature and contact with the shaft? • Which option directly affects cooling/lubrication of the packing as the shaft turns?

✅ Before You Answer

• Identify which choices would increase friction and heat at the shaft/packing interface • Decide which choice relates most directly to cooling and lubrication of the packing • Eliminate any options that would more likely cause leakage rather than burning or glazing of the packing surface