When a horizontal type centrifugal pump is...

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Question 1 of 205eccef9bbacbc34ba4d454e6

When a horizontal type centrifugal pump is used for dewatering the engine room bilges, you would __________. use a rotary, liquid piston type pump to obtain a prime partially open the sea suction valve, then gradually switch over to the required engine room bilge suction valve

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🔍 Key Concepts

• Centrifugal pump priming – why most horizontal centrifugal pumps cannot lift air and need to be flooded or otherwise primed • Difference between sea suction and bilge suction lines and what each one normally contains (sea water vs. air/bilge water mix) • Normal and safe procedure for shifting suction on bilge/ballast/GS (general service) pumps

💭 Think About

• Ask yourself: Can a horizontal centrifugal pump start pumping from a dry bilge line without being primed or flooded, or does it need a certain condition first? • Think about what happens inside the pump casing if you crack open the sea suction slightly before taking bilge suction – what are you accomplishing for the pump? • Consider whether a rotary, liquid piston type pump is typically used as a separate priming device for a centrifugal pump, or if the procedure can be done using only the suction valves.

✅ Before You Answer

• Verify whether centrifugal pumps are self-priming or normally require some method to remove air from the casing and suction line. • Check which method (I or II) would actually ensure the pump casing is filled with liquid before full bilge suction is taken. • Confirm that any method chosen does not risk flooding the bilge or contaminating the sea with oily bilge water, and follows normal engine-room operating practice.

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