While on watch at sea, you notice the main...

Question 1 / 270705eccefa1bacbc34ba4d472f8

Question 1 of 270705eccefa1bacbc34ba4d472f8

While on watch at sea, you notice the main lube oil pump suction vacuum has been increasing. To correct this you should __________.

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Question 1 of 27070

While on watch at sea, you notice the main lube oil pump suction vacuum has been increasing. To correct this you should __________.

🔍 Key Concepts

• Main lube oil system suction side and what causes increasing vacuum • How duplex strainers are cleaned or switched over safely while underway • Risks of introducing air or losing suction on the main lube oil pump

💭 Think About

• Is an increasing suction vacuum usually a sign of a blockage/restriction or a leak on the suction side? • Which actions can safely clear a suspected restriction without opening the system to atmosphere while the main engine is running? • Which option best reflects standard, conservative engineering practice for protecting the main engine from lube oil starvation?

✅ Before You Answer

• Verify which actions would maintain pump suction and avoid air ingestion into the lube oil system while underway • Check which option involves opening the system (covers, drains, vents) with the engine still running and why that may be unsafe • Consider how a duplex strainer is normally cleaned or restored to proper flow when differential or suction vacuum rises

Question 1 of 27070

While on watch at sea, you notice the main lube oil pump suction vacuum has been increasing. To correct this you should __________.

slightly open drain lines on each of the duplex suction strainers to decrease vacuum differential

back flush each of the duplex strainer baskets through the recirculating line

stop the main engine prior to removing suction strainer covers, if changing over to the standby strainer did not correct the condition

rotate the knife edge cleaning device handle one complete turn

Question 1 / 270705eccefa1bacbc34ba4d472f8

Question 1 of 270705eccefa1bacbc34ba4d472f8

While on watch at sea, you notice the main lube oil pump suction vacuum has been increasing. To correct this you should __________.

Back

Question 1 of 27070

While on watch at sea, you notice the main lube oil pump suction vacuum has been increasing. To correct this you should __________.