Operation below which mark will expose the pump pickup causing aeration and/or loss of pressure?

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Prepare for the City of Miami Fire Department Driver-Engineer Exam. Review multiple choice questions with hints and explanations. Succeed on your test!

Multiple Choice

Operation below which mark will expose the pump pickup causing aeration and/or loss of pressure?

Explanation:
Air entering the suction line causes loss of prime and a drop in discharge pressure. The pump pickup must stay submerged to prevent this. When water level falls below the low mark, the intake can become exposed to air, letting air into the suction and causing aeration and pressure loss. Keeping the water above the low mark keeps the pickup submerged, avoiding air ingestion. The other marks indicate deeper water, which still covers the pickup, so they don’t cause aeration.

Air entering the suction line causes loss of prime and a drop in discharge pressure. The pump pickup must stay submerged to prevent this. When water level falls below the low mark, the intake can become exposed to air, letting air into the suction and causing aeration and pressure loss. Keeping the water above the low mark keeps the pickup submerged, avoiding air ingestion. The other marks indicate deeper water, which still covers the pickup, so they don’t cause aeration.

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