OBJECTIVES

The objective of this experiment is to obtain performance characteristics (as describe above) for a variable speed centrifugal pump operating at 3 different impeller speeds.

 

EXPERIMENTAL APPARATUS

 

The experimental set-up consists of;

i)                    Water flow bench and centrifugal pump

ii)                   Instrumentation for data acquisition

 

Instrument Panel – Refer to the schematic diagram below.

i)                    Speed control to change the pump speed. Pump speed can be varied over range of 0 – 3000 rpm.

ii)                   Pump suction and delivery pressures.

iii)                 Torque measurement.

Figure 1.3 The Instrument Panel.

TURBINE INLET

TORQUE (Nm)

PUMP DELIVER

PUMP SUCTION

MOTOR DRIVE

	Figure 1: Schematic of Instrument Panel

 

 

Flow Measurement – Using “V” notch weir

Flow rate in the system can be measured relating the height of water seen in the sight glass to graph T1 and reading off the flow rate in litres per minute.

 

Figure 1.4 The ‘V’ Notch Weir.

 

Speed Measurement

Pump motor speed measurements are made using hand held digital tachometer