ME 142L Gear Pump Test Experimentmade

ME 142L

EXPERIMENT NO. 5

TITLE:

Performance of Gear Pump

ABSTRACT:

For this experiment Gear pump characteristic is under observation. We need to be familiar on how to operate the gear pump. Also we need to generate the characteristic curve using the gear pump. Observing the relationship of the flow, head, efficiency and power to create a graph. Lastly we have to observe the sound make by the gear pump. INTRODUCTION:

For the experiment we have used the gear pump test set. The External gear pump can be single or doubled type of pump. It can have some configuration with the gear it can be spur, helical, and herringbone gear. Helical and herringbone gears can have a smoother flow compare to the spur gears. Also the helical and herringbone can be used in large capacity flow. External gear pumps are a popular pumping principle and are often used as lubrication pumps in machine tools, in fluid power transfer units, and as oil pumps in engines. ADVANTAGE:     

High speed High pressure  No overhung bearing loads Relatively quiet operation Design accommodates wide variety of materials

DISADVANTAGE: 

 

Four bushings in liquid area No solids allowed Fixed End Clearance

OBJECTIVE : 

To be familiarized with the use of a gear pump.



To get the gear pump efficiency



To observe the relationship of the flow head, efficiency and power.



To create graphical representation of the relationship of the head and water flow

APPARATUS: 

Thermometer -The thermometer was used for the measurement of the oil temperature.



Stopwatch -Stopwatch was used to get the volume flow of the oil.



Clamp meter -Clamp Meter is used to get the ampere.



Compact Gear Pump Test Set -Testing set that will be use specifically for the gear pump.

PROCEDURES : 1. Prepare all necessary equipment such as the compact gear pump test set, thermometer, stopwatch and clamp meter. 2. Consider the safety precaution before conducting the experiment and powering the pump. 3. Start with a fully opened discharged valve and turn on the pump. 4. For other succeeding trials, gradually adjust the discharge valve by rotating it in clockwise direction for about 180° until there is a noticeable reading in the discharge valve gauge 5. Record the necessary parameter needed for the computation such as the discharge pressure, suction pressure, input power, flow meter reading and temperature. 6. After a noticeable reading in the discharge pressure, reduce the adjustment of the discharge valve to 90° then record. 7. Continue the adjustment until the valve is fully closed.

SAFETY PRECAUTION: 1. Do not operate the pump starting in the fully closed discharge valve 2. Avoid touching the motor unit 3. Remove loose and hanging accessories before working on the unit 4. Do force cooling and monitor the temperature of the motor.

DAT A AND RESULTS : Table 1. Raw Data Trial number

Temperature (°C)

Psuction (

 



)

Pdischarge

Volume

Time

Current

 

(L)

(S)

(Ampere)

(



)

1- Fully open

39

0

0

5

10

1.3

2(turn 180°)

39

0

0

5

10

1.3

3(turn 180°)

39

0

0

5

10

1.3

4(turn 180°)

39

0

0

4.9

10

1.3

5(turn 180°)

39

0

0

5

10

1.3

6(turn 180°)

39

0

0

5.1

10

1.3

7(turn 180°)

39

0

0

5.2

10

1.2

8(turn 180°)

39

0

0

5

10

1.2

9(turn 180°)

39

0

0

5.2

10

1.2

10(turn 180°)

39

0

0

5.1

10

1.2

11(turn 180°)

39

0

0

5.2

10

1.2

12(turn 180°)

39

0

0.1

5

10

1.2

13(turn 90°)

39

0

0.6

4

10

1.3

14(turn 90°)

39

0

3

2.6

10

1.6

15(turn 90°)

39

0

4.7

1.5

10

1.9

16-fully closed

39

0

4.9

0

10

1.9

Table 2. Computed Values

Density Trial number

(





)

Head (m)

Flow rate 

(



)

Water

Electrical

power

Power

Efficiency

(Watts)

(Watts)

(%)

1( Fully open)

866.92

0.00

0.0005

0

286.65

0

2

866.92

0.00

0.0005

0

286.65

0

3

866.92

0.00

0.0005

0

286.65

0

4

866.92

0.00

0.00049

0

286.65

0

5

866.92

0.00

0.0005

0

286.65

0

6

866.92

0.00

0.00051

0

286.65

0

7

866.92

0.00

0.00052

0

264.6

0

8

866.92

0.00

0.0005

0

264.6

0

9

866.92

0.00

0.00052

0

264.6

0

10

866.92

0.00

0.00051

0

264.6

0

11

866.92

0.00

0.00052

0

264.6

0

12

866.92

1.15

0.0005

4.91

264.6

1.85

13

866.92

6.92

0.0004

23.54

286.65

8.21

14

866.92

34.61

0.00026

76.52

352.8

21.69

15

866.92

54.21

0.00015

69.16

418.95

16.51

Sample computation: Trial 15

=

0.0015 10

= .  

−

 

  = ℎ = 866.929.811.510− 34.61 = .  =

=

GRAPH:

4.70 866.92

100 = .  

 76.52  100 = 100 = . %  352.8

DISCUSSION:

For this experiment steam table is being used to get the density. Temperature affects the density of the oil. For a 39°C temperature oil will have a density of 866.92





.

The head is formulated as:

ℎ=

   − Ɣ

x100%

Flow rate is formulated as:

=

 

The power is formulated as:  P h(kW) = q ρ g h The efficiency of the reciprocating pump is formulated as: η = water power / Power

SUPPLEMENTARY INFORMATION:

Gear Pumps are a type of Rotary Positive Displacement Pump.They consists of at least two separate and rotating gears with intermeshing teeth. As these meshed teeth separate, they create a partial vacuum which is filled by the fluid being pumped. As the gears then continue to rotate the fluid becomes trapped and is carried around the casing to the discharge side of the  pump. Here as the gear teeth begin to re-mesh the fluid is ejected creating a pumping action. There are a number of different Gear Pump designs but ultimately they all employ this same  pumping principle.

Gear Pump Types

External Gear Pumps

These pumps have been around the longest and are also the simplest. They employ two parallel gears mounted on shafts and can have single or double rows of teeth. The simplest version has straight cut ‘spur’ gears of involutes form but ‘herring bone’ and also ‘helical form’ teeth are also available.

Internal Gear Pumps

There are several types of internal gear pump but all are fundamentally the same. The ‘gear within a gear’ design is a relative recent development. The advantage is that mechanically the shafts have less supporting bearings and the teeth are bigger  but fewer making them especially useful for very viscous fluids.

Gerotor Pumps

These are similar to internal gear pumps but employ a different mechanical arrangement. They are compact and very cheap to produce especially in small sizes. Their simplicity makes them exceptional for OEM applications such as lubrication and circulation. This makes them the automatic choice for automobile gearbox lubrication and aviation fuel applications.

CONCLUSION :

For this experiment we have used gear pump test set. It has a different flow rate gage and do not have a suction valve. A gear pump is a positively displacement pump. We can operate the gear pump with the fully opened valve. Also we have observed the change of sound for the gear  pump. As soon as we (appliedpumps, 2015)compared to other pump. While in power there is the highest peak in a certain flow rate. For the head there is sudden decrease in head in a certain flow rate.

Bibliography Viking Pump, Inc. (2014).  pumpschool . Retrieved July 18, 2016, from pumpschool: http://www.pumpschool.com/ appliedpumps. (2015). Retrieved july 17, 2016, from applied pump LTD.: http://appliedpumps.co.uk/