OIT Pumping Systems and Hydraulics Flashcards
6 cards from real OIT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
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What is the term for the total head a pump must overcome, including elevation, friction, and pressure differences?
Answer: Total dynamic head (TDH)
Total dynamic head (TDH) is the total head a pump must overcome and includes static lift, friction losses, and pressure requirements.
What type of pump is most commonly used in water and wastewater treatment facilities?
Answer: Centrifugal pump
Centrifugal pumps are the most widely used pumps in water and wastewater treatment due to their simplicity, reliability, and efficiency.
What does NPSH stand for in pump hydraulics?
Answer: Net Positive Suction Head
NPSH (Net Positive Suction Head) is the pressure available at the pump inlet above the vapor pressure of the liquid, critical for preventing cavitation.
What condition occurs when vapor bubbles form and collapse inside a pump due to low suction pressure?
Answer: Cavitation
Cavitation occurs when local pressure drops below the liquid's vapor pressure, forming bubbles that violently collapse and damage pump components.
What is the purpose of a check valve installed on the discharge side of a pump?
Answer: To prevent backflow when the pump stops
A discharge check valve prevents water from flowing backward through the pump when it shuts down, protecting the pump and maintaining system pressure.
What does a pump curve show?
Answer: The relationship between flow rate and head for a specific pump
A pump curve (or performance curve) shows the relationship between flow rate (GPM) and total head (feet) for a specific pump model.