CHARACTERISTICS CURVES OF SUBMERSIBLE PUMP - Computer Programming

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## Wednesday, March 30, 2011

CHARACTERISTICS CURVES OF SUBMERSIBLE PUMP

AIM :

To study the performance characteristics of a submersible pump.

APPARATUS REQUIRED :

1.      Submersible pump
2.      Meter scale
3.      Stop watch
FORMULAE :

1. ACTUAL DISCHARGE:

Qact  = A x h / t                           (m³ / sec)

Where,
A = Area of the collecting tank                  (m²)
h = Height of the water level collected      (cm)
t  = Time taken for ‘h’ rise of water           (seconds)
x = Distance between the suction and delivery gauge

2. INPUT POWER:

Pi = (3600 ´ Nr ´ 1000) / (Ne ´ te)         (watts)

Where,
Nr = number of revolutions of energy meter disc
Ne = energy meter constant                   (rev / Kw hr)
te = time taken for ‘Nr’ revolutions      (seconds)

3. OUTPUT POWER:
Po = W ´ Qact ´ H                          (watts)

Where,
W   = specific weight of water                   (N / m³)
Qact = actual discharge                               (m³ / s)
H     = total head of water                             (m)

4. EFFICIENCY:
%h = (Output power Po / input power Pi) ´ 100

DESCRIPTION:

In submergible pump electric motor and pump are coupled together and both are submerged in the water. The electric current is conducted through a waterproof cable. This is multi stage centrifugal pump with radial or mixed flow impellers.
The suction housing of the pump is fitted between the pump and motors are provided with a perforated strainer. The windings of the motor are insulated well and cooled by water. A gate valve, which is a non-return valve, is provided at the top of the pump to discharge water.

PROCEDURE:
1.The submersible pump is started
2. The delivery gauge reading is set to the required value by means of
3.The time taken for Nr revolutions in the energy meter disc is
Noted  with the help of stop watch
4.The time taken for ‘h’ rise in water level in the collecting tank is
Found carefully. If the water flow is heavy reduce the ‘h’ value
5.The experiment is repeated for different delivery gauge readings
6.Finally the readings are tabulated and calculated

GRAPHS:

1.  Actual discharge Vs Total head
2.      Actual discharge Vs Input power
3.      Actual discharge Vs Efficiency

RESULT:

The performance characteristic of the submersible pump is studied and the efficiency is calculated  …………… %