Question

In a turbine pump the direction of End Thrust is

• A. In the middle of the pump
• B. From suction end towards delivery end
• C. From delivery end towards Suction end
• D. Any where on the shaft of Turbine pump

Hint:

Think of the pump like a rocket.
High pressure is created at the back (delivery side) and pushes forward.
The "forward" direction for the impeller is towards the low-pressure intake (suction side).
So, the thrust is always from High Pressure -> Low Pressure.

Answer 1

The Correct Option is C

Step 1: Understanding the Question:
The question asks for the direction of the net axial force, known as "end thrust," on the impeller shaft of a turbine pump.

Step 2: Detailed Explanation:
A turbine pump (a type of centrifugal pump) works by spinning an impeller to add energy to a fluid.
The fluid enters the impeller at the "suction" eye (low pressure) and is thrown outwards to the "delivery" or discharge end (high pressure).
This pressure difference acts on the surfaces of the impeller, creating an axial force.
The main causes of end thrust are:
1.

Pressure on Impeller Shrouds: The high-pressure water on the delivery side acts on the outer face of the impeller shroud.
The low-pressure water on the suction side acts on the inner face (the eye).
Because the area on the delivery side is larger than the area of the suction eye, there is a net force pushing the impeller.
2.

Change in Momentum: The fluid enters the pump axially and exits radially (or at an angle).
This change in the direction of momentum also creates a reaction force on the impeller.
The combined effect of these forces is a net axial thrust that is directed from the high-pressure (delivery) side towards the low-pressure (suction) side.
This thrust must be managed by thrust bearings to prevent damage to the pump.

Step 3: Final Answer:
The direction of the end thrust is from the delivery end towards the suction end.
This corresponds to option (C).