CHARACTERISTICS CURVES OF RECIPROCATING PUMP - Computer Programming

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## Wednesday, March 30, 2011

##### CHARACTERISTICS CURVES OF RECIPROCATING PUMP

Exp No: 7
Date:

AIM:
To study the performance characteristics of a reciprocating pump and to determine the characteristic with maximum efficiency.

APPARATUS REQUIRED:

1.      Reciprocating pump
2.      Meter scale
3.      Stop watch

FORMULAE:

1. ACTUAL DISCHARGE:

Q act  = A x y / t                    (m3 / s)

Where:
A = Area of the collecting tank (m2)
y  = 10 cm rise of water level in the collecting tank
t  = Time taken for 10 cm rise of water level in collecting tank

H = Hd + Hs + Z
Where:
Hd = Discharge head; Hd = Pd x 10, m
Hs = Suction head; Pd = Ps x 0.0136, m
Pd  = Pressure gauge reading, kg / cm2
Ps   = Suction pressure gauge reading, mm of Hg
3.INPUT POWER:

Pi   = (3600 ´ N) / (E ´ T)            (Kw)

Where,
N = Number of revolutions of energy meter disc
E = Energy meter constant                  (rev / Kw hr)
T = time taken for ‘N’ revolutions      (seconds)

4. OUTPUT POWER:

Po = ρ x g x Q x H / 1000              (Kw)

Where,
ρ = Density of water                        (kg / m³)
g = Acceleration due to gravity       (m / s2)
H = Total head of water                   (m)
Q = Discharge                                  (m3 / sec)

5.EFFICIENCY:

ho = (Output power  po / input power  pi) ´ 100 %

Where,
Po = Output power KW
Pi  = Input power  KW
PROCEDURE:
1.      Close the delivery valve and switch on the unit
2.      Open the delivery valve and maintain the required delivery head
4.      Close the drain valve and note down the time taken for 10 cm rise of water level in collecting tank
5.      Measure the area of collecting tank
6.      For different delivery tubes, repeat the experiment
7.      For every set reading note down the time taken for 5 revolutions of energy meter disc.

GRAPHS:

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

RESULT:

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