Vunguyen_1504896_Lab#1

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University of Houston *

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3118

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Mechanical Engineering

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Apr 3, 2024

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UNIVERSITY OF HOUSTON College of Technology Fluid Mechanics Application Lab MECT 3118 Spring 2019 Course section: 04298 Thursday 09:00 AM to 12:00 PM LAB # 1 Pressure Gauge Calibration Name: Vu H Nguyen Due date: 04/10/19 PS#: 1504896 Grade:
Objectives: In this experiment, the student will learn how to calibrate a pressure gauge with dead weight on a plunger piston. Background: There are a lot of different type of equipment to measure pressure was discovered and used by engineering and scientists. The water manometer is the most common and fundamental instrument. However, each equipment has its own advantage and disadvantage when applied into a specific purpose. Because of that, the engineering or scientists need to know how accuracy of the equipment they choose for a particular application. They also need to know how to calibrate the instrument for accuracy reading. Due to that reason, the Calibration of a Pressure gauge that use Bourdon pressure gauge with dead weight is the common instrument to show the student how pressure gauge work and how to calibrate pressure gage. Equipment: - Calibration of Pressure gauge - Bourdon pressure gauge - Various weight. Figure 1: Calibration of Pressure gauge with dead weight Testing Material: - Water
Procedure: 1. A table was made by the student before heading to the lab 2. The TA went over the equipment with the student. 3. The cross-section area of the piston was noted by the student 4. The student place the piston with its loading platform. Due to the piston have the mass is 1kg. So, the piston is the 1 st weight on the table, the student also records the number on bourdon pressure gauge. 5. The student add the weight to the platform. Record the total weight and pressure gauge. 6. The student repeat step 5 for 7 reading, and the pressure gauge reach around 170 Psi. Note: the maximum weight can apply is 6kg. 7. The student did the reverse procedure, the weight was removing each time, the pressure gauge also record by the student each time the weight was removed. Result: Mass (kg) Force (N) Applied Pressure kN/m 2 ) Gauge reading Increase (kN/m 2 ) Gauge reading Decrease (kN/m 2 ) Avg Gauge readin g Avg error (kN/m 2 ) Error % 1 9.81 31.143 40 41 40.5 9.357 23.1037 1.5 14.715 46.7145 53 54 53.5 6.7855 12.6831 8 2 19.62 62.286 68 73 70.5 8.214 11.6510 6 3 29.43 93.429 99 100 99.5 6.071 6.10150 8 4 39.24 124.572 130 130 130 5.428 4.17538 5 5 49.05 155.715 159 160 159.5 3.785 2.37304 1 5.2 51.012 161.943 6 167 167 167 5.0564 3.02778 4 Calculation:
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W = mg = 1 kg× 9.81 m s 2 = 9.81 N Applied pressure : P = W A = 9.81 × 10 3 315 × 10 6 = 31.143 ( kN m 2 ) Avgerror = Average gaugereading applied pressure = 40.5 31.143 = 9.375 kN / m 2 Error % = Average error Average gaugereading × 100 = 9.357 40.5 × 100 = 23.10% 31.14 46.71 62.29 93.43 124.57 155.72 161.94 0 20 40 60 80 100 120 140 160 180 Increase and decrease gauge reading Applied Pressure (kN/m^2) Indicated Gauge Pressure Figure 2: Graph increase and decrease gauge reading vs applied pressure 31.14 46.71 62.29 93.43 124.57 155.72 161.94 0 1 2 3 4 5 6 7 8 9 10 Average Gauge Error Reading Applied Pressure (kN/m2 Error (kN/m^2) Figure 3: Graph average gauge error reading vs applied pressure
Conclusion: By this experiment, the student learned how to measure the pressure by using bourbon pressure gauge and know how to calibrate by using the TecQuipment Calibration of a Pressure gauge by using a large Bourdon pressure gage with dead weight. The result is as expected, however, the graph on this report is kind of slightly different with the graph on the lab handout. The error may include a lot of factor. The human factor is one of them. When reading the number on bourbon gauge, the face of the student need to perpendicular to the gauge face. Or the error may due to hysteresis caused by friction in the mechanical movement in the gauge.