When two ballast pumps used for deballasting...

Question 1 / 2707066636ee728f7522a1c518d4a

Question 1 of 2707066636ee728f7522a1c518d4a

When two ballast pumps used for deballasting a single tank start cavitating, you should __________.

Question 1 of 27070

When two ballast pumps used for deballasting a single tank start cavitating, you should __________.

🔍 Key Concepts

• Cavitation in centrifugal pumps – what it is and why it happens • Effect of two pumps drawing from the same suction source (single tank) • How suction and discharge valves affect pressure and flow in a pump

💭 Think About

• Think about what cavitation tells you about the pressure and flow conditions at the suction side of the pump. • If both pumps on the same tank start cavitating, what does that say about the available NPSH (Net Positive Suction Head) from the tank? • For each choice, ask: does this action make it easier or harder for liquid to reach the pump impeller without forming vapor bubbles?

✅ Before You Answer

• Which action will reduce suction lift or increase suction pressure at the pump inlet? • Which options would actually worsen cavitation by increasing restriction on the suction side or overloading the pumps? • Remember that cavitation is primarily a suction-side problem, not usually solved by restricting discharge flow in this type of ballast service.

Question 1 of 27070

When two ballast pumps used for deballasting a single tank start cavitating, you should __________.

shut down one pump

open all valves on the discharge side to permit improved flow

close the valve on the suction side of the ballast pump to re-prime the pump

close the valve on the discharge side of the pump to re-acquire suction

Question 1 / 2707066636ee728f7522a1c518d4a

Question 1 of 2707066636ee728f7522a1c518d4a

When two ballast pumps used for deballasting a single tank start cavitating, you should __________.

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Question 1 of 27070

When two ballast pumps used for deballasting a single tank start cavitating, you should __________.