fluid report 1

8/8/2019 Fluid Report 1

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Name: Mohamed Ahmed Ashraf Abd Elghany Bakr

Elgheriany

Section: 8

Number: 335

Alexandria University,

Faculty of Engineering,Mechanical Engineering Department.

Fluid report 1

Name: Mohamed Ahmed Ashraf Abd Elghany bakrElgheriany

Section: 8

No.: 335

Experiment 1:

Calibration of a pressure gauge by

using a dead weight tester.

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Elgheriany

Section: 8

Number: 335

Objective:

The aim of this experiment is to calibrate apressure gauge using weights by benefiting of theproperty of pressure applied to a liquid at rest istransferred undiminished to every part of theliquid and even to the walls of the container(Pascals principle), so pressure applied by weightapplied to the piston is transferred through oil tillit reaches pressure gauge causing a reading.

So by applying known pressure to the liquid,which apply it to the gauge causing a readingwhich contains an error. This error can be remarked by the following procedure.

Procedure:

1- Fill the interior of the apparatus with oil, and free it from air

bubbles

2- Fit the tested gauge in position.

3- Level the apparatus in a horizontal position.

4- Table the reading of the tested gauge before putting the piston in place. This is

the zero reading of the gauge.

5- Close the valve of the tested gauge and put the piston in place. Put a load on the

piston and use the handle to reach the equilibrium position, Stake reading of gauge

at equilibrium position.

6- Repeat, with increasing the load, use handle to retain equilibrium position.

7 - Continue till you reach the maximum reading on the gauge then reduce the loadgradually and take readings in the unloading process.

8- Plot a curve between the actual pressure and the indicated pressure.

The actual pressure = (Load)/ (area of piston)

Indicated pressure = reading on the gauge.

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Elgheriany

Section: 8

Number: 335

3.Observations:

Load (kgf) Indicated pressure (kgf/cm2)

During unloading During

loadingzero Zero Zero

1 0.9 0.9

2 1.9 1.9

3 2.9 2.9

4 3.9 3.9

5 4.9 4.9

Results:

Actual pressure

(kgf/cm2)

Indicated pressure (kgf/cm2)

Loading Unloading AverageZero Zero Zero Zero

1 0.9 0.9 0.92 1.9 1.9 1.9

3 2.9 2.9 2.9

4 3.9 3.9 3.9

5 4.9 4.9 4.9

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Elgheriany

Section: 8

Number: 335

4.This is a simple graph between actual pressure

and average indicated pressure:

calibration of pressure gauge by dead weight

tester

01

2

3

4

5

6

0 1 2 3 4 5 6

actual pressure in (kgf/cm2)

ave

rageindicted

pressurein(kgf/cm2)

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fluid report 1

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