CHARACTERISTICS CURVES OF GEAR OIL PUMP - Computer Programming

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## Wednesday, March 30, 2011

CHARACTERISTICS CURVES OF GEAR OIL PUMP

AIM:

To draw the characteristics curves of gear oil pump and also to determine efficiency of given gear oil pump.

APPARATUS REQUIRED:

1.      Gear oil pump setup
2.      Meter scale
3.      Stop watch

FORMULAE:

1. ACTUAL DISCHARGE:

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

Where,
A = Area of the collecting tank                  (m²)
y =  Rise of oil level in collecting tank       (cm)
t = Time taken for ‘h’ rise of oil in collecting tank (s)

2. TOTAL HEAD:
H = Hd + Hs + Z
Where
Hd = Discharge head; Hd = Pd x 12.5, m
Hs = Suction head; Pd = Ps x 0.0136, m
Z   = Datum head, 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,
Nr = Number of revolutions of energy meter disc
Ne = Energy meter constant        (rev / Kw hr)
te = Time taken for ‘Nr’ revolutions   (seconds)

4. OUTPUT POWER:

Po = W ´ Qact ´ H  /1000                        (watts)

Where,
W    = Specific weight of oil        (N / m³)
Qact  = Actual discharge                (m³ / s)
h    = Total head of oil                (m)

5. EFFICIENCY:

%h = (Output power Po / input power Pi) ´ 100

DESCRIPTION:

The gear oil pump consists of two identical intermeshing spur wheels working with a fine clearance inside the casing. The wheels are so designed that they form a fluid tight joint at the point of contact. One of the wheels is keyed to driving shaft and the other revolves as the driven wheel.
The pump is first filled with the oil before it starts. As the gear rotates, the oil is trapped in between their teeth and is flown to the discharge end round the casing. The rotating gears build-up sufficient pressure to force the oil in to the delivery pipe.

PROCEDURE:
1.   The gear oil pump is stated.
2.      The delivery gauge reading is adjusted for the required value.
3.      The corresponding suction gauge reading is noted.
4.      The time taken for ‘N’ revolutions in the energy meter is noted with the help of a stopwatch.
5.      The time taken for ‘h’ rise in oil level is also noted down after closing the gate valve.
6.      With the help of the meter scale the distance between the suction and delivery gauge is noted.
7.      For calculating the area of the collecting tank its dimensions are noted down.
8.      The experiment is repeated for different delivery gauge readings.
9.      Finally the readings are tabulated.

GRAPH:

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

RESULT:

Thus the performance characteristics of gear oil pump was studied and maximum efficiency was found to be. ………%.

 h % Output power Po kw Mean = Input power Pi kw Time taken for N rev of energy meter disc   t   sec Actual discharge   Qact    m³/s Time taken for 10 cm of rise of water in tank t sec Total head H  m Datum head Z     m Suction head Hs = Ps x 0.0136  m Delivery head Hd=Pdx12.5          m Suction pressure reading Ps mm of Hg Delivery pressure reading Pd     kgf / cm2 S.no

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