Question

A centrifugal pump rotates at 3450 rpm and provides a flow of 36m³ /h of water with a load of 30m and 5hp of power. If its rotational speed drops to 2300 rpm, determine the new values of:

a) The discharge of the pump in m³/h

Answer 1

The new discharge of the centrifugal pump is 24 m³/h.

Step-by-step explanation:

When a centrifugal pump's rotational speed drops, its discharge decreases, assuming all other factors remain constant. The flow rate of a centrifugal pump is directly proportional to its rotational speed.

To find the new discharge of the pump, we can use the formula:

Discharge = Flow rate × (Rotational speed 2 /Rotational speed 1)

Given that the initial rotational speed (Rotational speed 1) is 3450 rpm and the initial discharge is 36 m³/h, and the new rotational speed (Rotational speed 2) is 2300 rpm, we can calculate the new discharge as follows:

Discharge = 36 m³/h × (2300/3450)

Discharge = 24 m³/h