🔍 Key Concepts

• Centrifugal pump stuffing box function and location • Purpose of cooling and lubricating pump packing • Effect of seal water (gland water) on pump suction/vacuum

💭 Think About

• Ask yourself: What happens to the packing and shaft in a stuffing box if there is no cool, clean water supplied to it? • Which choice best describes a function that both protects the packing and supports the pump’s ability to move liquid (especially when suction conditions are critical)? • Eliminate any answers that talk about effects that are normally controlled by the driver (motor/turbine speed) rather than by a small water line into the stuffing box.

✅ Before You Answer

• Check which options mention packing protection/cooling or sealing rather than unrelated pump behaviors. • Verify which choice connects the seal water line with maintaining suction/vacuum rather than discharge or thrust changes. • Rule out any option that suggests the stuffing box line directly controls speed or thrust, and focus on sealing, lubrication, and temperature.