ESSOM COMPANY LIMITED
Part 3: Experiment
13
PART 3: OPERATION AND EXPERIMENT PROCEDURES
INTRODUCTION
For HB 023P Mini Pelton turbine, the flow rate is measured by a Hydraulics Bench measuring tank, the pressure by a
pressure gauge, the turbine speed by a portable speed indicator and the forces on the Prony brake are measured by spring
balances
.
With an alternative design, the Prony brake uses only one spring balance and the reading is the net force for the
torque
.
Portable tachometer
Flow control valve
From hydraulics bench
To hydraulics bench
Hydraulics bench
Spring balance
Mechanical brake
Pelton turbine
Pressure gauge
TV
Figure 3- 1
:
Schematic piping diagram of the HB 023P Mini Francis turbine with Hydraulics Bench
EXPERIMENT PROCEDURES
Equipment Setup
1.
Install hydraulics bench
(
see the hydraulics bench instruction manual
).
2.
Close drain valve and flow control valve
.
3.
Fill the storage tank of the hydraulics bench with water to about 5 cm
.
below the full level
.
4.
Install the turbine on the hydraulics bench, ensure that the turbine discharge pipe is aligned with the channel of
the hydraulics bench
.
5.
Connect the hydraulics bench water outlet hose to the water inlet pipe of the turbine
.
6.
Close the turbine control valve
(
Nozzle Valve, TV
).
7.
Check the dynamometer mechanism, ensure that there is no load attached to the dynamometer, and record the
diameter of brake drum
. (
see Appendix 2
).
8.
Turn on the pump and slowly open flow control valve to full
.
This provides maximum pump delivery and will
generate the pressure head in the nozzle valve
.
9.
Note that turbine inlet pressure, turbine speed, and spring force read zero
.
Begin the Test
1.
Slowly open the turbine control valve (TV) to obtain a turbine inlet pressure, e.g. 1.2 kg/cm2.
2.
Record the following data:
Turbine inlet pressure, p
kg/cm2
Volume, V
L
Time, t
min
Turbine speed, n
rpm
Force on spring balance left, FLeft
g
Force on spring balance right, FRight
g
