Question
Axial flow pump is started with its delivery valve
The correct answer is
kept fully open
Axial Flow Pump Starting Procedure
Axial flow pumps operate differently from centrifugal pumps. They are best suited for high flow rate, low head applications.
Reasoning for Valve Position
The power characteristic of an axial flow pump is such that it does not overload significantly even at maximum flow rates. Starting the pump:
- With a closed or partially closed valve: Creates high head and low flow conditions. This is inefficient and puts unnecessary stress on the pump components during startup.
- With a fully open valve: Allows the pump to start under minimal resistance (low head, high flow). This ensures a smooth start, requires less starting torque, and operates closer to its intended design point from the beginning.
Therefore, for an axial flow pump, the delivery valve must be kept fully open when starting.
Correct Option Analysis
- Option 1 (Kept fully closed): Incorrect. Leads to inefficient startup and potential stress.
- Option 2 (Kept fully open): Correct. Ensures smooth, efficient, and safe startup.
- Option 3 (Irrespective of any position): Incorrect. Position matters for efficient operation.
- Option 4 (Kept 50% open): Incorrect. Not the optimal position for startup.
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