Centrifugal pump terminology: manometric head Statement: The manometric head is the actual head of water against which a centrifugal pump has to work (including suction and delivery static heads and relevant losses).

Difficulty: Easy

Correct Answer: Correct

Explanation:


Introduction / Context:
For centrifugal pumps, various heads are defined to analyze performance: suction head, delivery head, static head, and manometric head. Understanding the manometric head is essential for comparing pump curves with system curves and selecting the right pump for an installation.


Given Data / Assumptions:

  • Steady operation with water as the working fluid.
  • Heads measured relative to the same datum.
  • Losses in suction and delivery lines may be present.


Concept / Approach:
Manometric head H_m is effectively the head against which the pump must deliver water. It is commonly expressed as the difference between the total head at the pump discharge flange and the total head at the pump suction flange, accounting for velocity heads and losses. Practical definitions in textbooks also relate H_m to the static head plus pipeline losses up to the discharge point.


Step-by-Step Solution:
Identify suction-side energy level (pressure head + velocity head + elevation).Identify delivery-side energy level at the point of delivery.Compute H_m = (Total head at delivery) − (Total head at suction).Recognize that this is the head the pump has to work against.


Verification / Alternative check:
When plotted on a system head curve, H_m corresponds to the ordinate at the operating flow, matching the pump’s head–capacity performance point.


Why Other Options Are Wrong:
Limiting the statement to reciprocating pumps or to specific inlet conditions is incorrect; the concept applies generally to centrifugal pumps. Zero suction head or flooded eye are operating states, not definitional requirements.


Common Pitfalls:
Confusing manometric head with static head only; omitting velocity head or line losses.


Final Answer:
Correct

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