Explain how to match an induction electric motor to a main circulating pump using pump characteristic and torque/ship diagrams?

flowchart LR
    A[Pump H–Q curve] -->|operating point| B[System curve]
    C[Motor power-speed] -->|must exceed| D[Pump power-speed]
    E[Motor torque-speed] -->|must exceed| F[Pump torque-speed]

• Context: Main circulating duty is a centrifugal pump for engine cooling water, running continuously
• Pump curves: Head vs flow and power vs flow from maker’s data; operating point where pump meets system curve
• Motor data: Starting current surge 5–7× full-load; starting methods DOL, star-delta, autotransformer, soft-starter, variable-frequency drive; method chosen for motor size, supply capacity and load starting torque
• Matching: Motor starting torque must exceed pump starting torque; motor power rating must exceed pump shaft power at duty point
• ETO check: Verify starting method suits supply; confirm motor thermal rating for continuous operation