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UNIVERSITI KUALA LUMPURMALAYSIAN INSTITUTE OF CHEMICAL & BIOENGINEERING TECHNOLOGY
CLB 21103PROCESS INSTRUMENTATION
BACHELOR OF CHEMICAL ENGINEERING TECHNOLOGY
EXPERIMENT 2Pressure Measurement &
Calibration
SEMESTERJanuary 2013
Experiment 2: Pressure Measurement & Calibration System
EXPERIMENT 2
PRESSURE MEASUREMENT & CALIBRATION SYSTEM
1.0 EXPERIMENT PROCEDURES
1.1 Plant Start-up Procedures
1. Switch ON the main power supply. The switch is at the front of the panel/cubicle.
2. Check that all the manual valves including the vent (V) and bottom drain (D) valves are shut.
3. Open the manual valve MV3 at the Pressure Gauge (PG). Check the reading at Pressure Gauge (PG). If the Pressure Gauge (PG) shows some value of pressure in Tank TI, open the Vent (V) or bottom drain (D) valves to release the pressure in tank. This is done until the Pressure Gauge (PG) shows a ‘zero’ reading.
4. Connect the Manometer (AMETEK JOFRA CPC-200 INDG) properly to the Tester Tapping Point, MV 8.
1.2 Experiment 1 (Measurement)
1. Check that the main power supply at the front panel is switched ON.
2. Open manual valves MV1 connected to PT1, MV2 connected to PT2 and MV3 connected PG. Check that all other manual valves are fully shut.
3. Check that the AFR is at the set pressure of 30 psig.
4. Open manual valve MV6 next to AFR to fill up the Pressure Tank, T1.
5. Check that the Manometer is properly connected to the tester tapping point, MV8. Open fully the manual valve, MV8.
6. Check the readings at the Manometer and Pressure Gauge (PG). Once the pressure readings in both the instruments are stabilized, manual valve MV6 is shut fully.
7. Run the experiment Suggested pressure: 30 psig
Experiment 2: Pressure Measurement & Calibration System
Check the readings at the Manometer and Pressure Gauge (PG). Once the pressures readings in both the instruments are stabilized shut the vent (V) valve and record the data in Table 1.
Open the Vent (V) valve to release the pressure to the next suggestedpressure.
Continue measure the pressure from 25 psig until 0 psig.
1.3 Experiment 2 (PT1 Site Calibration)
1. Check that all the manual valves including the vent (V) and bottom drain (D) valves are shut.
2. Shut MV1 valve to isolate PT1 from the plant.
3. Remove the tubing connected to the transmitter.
4. Then, fix a vacuum pump (AMETEK MODEL T-750) to the transmitter to obtain a pressure. FIGURE 1.1
5. Connect the Manometer properly to PT1. FIGURE 1.1
6. Once this is done, a Multimeter (GW MODEL GDM-391A) is connected to PT1 to obtain the output signal from the transmitter for all the tested site calibration ranges. FIGURE 1.2
7. Configuration of PT1 can be carried out to access information of the transmitter.
1.4 Experiment 3 (PT2 Site Calibration)
1. Check that all the manual valves including the vent (V) and bottom drain (D) valves are shut.
2. Shut MV2 valve to isolate PT2 from the plant.
3. Remove the tubing connected to the transmitter.
4. Then, fix a vacuum pump (AMETEK MODEL T-750) to the transmitter to obtain a pressure.
5. Connect the Manometer properly to PT2.
6. Once this is done, a Multimeter (GW MODEL GDM-391A) is connected to PT2 to obtain the output signal from the transmitter for all the tested site calibration ranges.
7. Configuration of PT2 can be carried out to access information of the transmitter.
Experiment 2: Pressure Measurement & Calibration System
Plant Shut-down
1. Make sure that the remaining air in pressure tank, T1 is released with vent (V) valve fully open.
2. Shut the manual valve MV6 next to AFR and all other manual valves fully.
3. Reconnect the original tubing of both PT1 and PT2.
4. Switch OFF the main power supply to the plant at the front of the panel/ cubical.
Fig. 1.1: Connection of instrument to Pressure Transmitter, Hand Held & Manometer
Fig. 1.2: Connection between Multimeter & the Pressure Transmitter terminal
Experiment 2: Pressure Measurement & Calibration System
2.0 RESULTS
TABLE 1: Pressure Measurement
RUN I SET 1 SET 2 Average
A Suggested Pressure, psig 30.00 30.00 30.00
B Actual Gauge Pressure, psig 29.47 29.46 29.74
C Gauge Pressure, psig 30.00 30.00 30.00
D Gauge Pressure, psig 28.50 29.50 29.00
E Absolute Pressure, psia 44.20 44.30 44.25
F=B+ 14.70 Calculated Absolute Pressure, psia 44.17 44.16 44.44
G1 = | B — C |
Gauge Pressure Deviation, psig
At Pressure Gauge0.53
0.97
0.54
0.04
0.63
0.38G2 = | B — D | At Pressure Indicator, P12
H = | F — E | Absolute Pressure Deviation, psia 0.03 0.14 0.19
RUN II SET 1 SET 2 Average
A Suggested Pressure, psig 25.00 25.00 25.00
B Actual Gauge Pressure, psig 24.74 24.63 24.69
C Gauge Pressure, psig 25.00 25.00 25.00
D Gauge Pressure, psig 24.80 24.90 24.85
E Absolute Pressure, psia 39.50 39.50 39.50
F=B+ 14.70 Calculated Absolute Pressure, psia 39.44 39.33 39.39
G1 = lB — Cl
Gauge Pressure Deviation, psig
At Pressure Gauge 0.26
0.06
0.27
0.27
0.32
0.17G2 = lB — DlAt Pressure Indicator,
P12
H = IF — El Absolute Pressure Deviation, psia 0.06 0.17 0.12
Experiment 2: Pressure Measurement & Calibration System
RUN III SET 1 SET 2 Average
A Suggested Pressure, psig 20.00 20.00 20.00
B Actual Gauge Pressure, psig 19.53 19.45 19.49
C Gauge Pressure, psig 20.00 20.00 20.00
D Gauge Pressure, psig 20.00 20.00 20.00
E Absolute Pressure, psia 34.50 34.50 34.50
F=B+ 14.70 Calculated Absolute Pressure, psia 34.23 34.15 34.19
G1 = lB — Cl
Gauge Pressure Deviation, psig
At Pressure Gauge0.47
0.47
0.55
0.55
0.51
0.51G2 = lB — Dl At Pressure Indicator, P12
H = IF — El Absolute Pressure Deviation, psia 0.27 0.35 0.31
RUN IV SET 1 SET 2 Average
A Suggested Pressure, psig 15.00 15.00 15.00
B Actual Gauge Pressure, psig 14.38 14.34 14.36
C Gauge Pressure, psig 15.00 15.00 15.00
D Gauge Pressure, psig 14.50 15.10 14.8
E Absolute Pressure, psia 29.20 29.60 29.40
F=B+ 14.70 Calculated Absolute Pressure, psia 29.08 29.04 29.06
G1 = lB — Cl
Gauge Pressure Deviation, psig
At Pressure Gauge0.62
0.12
0.66
0.76
0.64
0.44G2 = lB — Dl At Pressure Indicator, P12
H = IF — El Absolute Pressure Deviation, psia 0.12 0.28 0.40
RUN V SET 1 SET 2 Average
A Suggested Pressure, psig 10.00 10.00 10.00
B Actual Gauge Pressure, psig 9.56 9.60 9.58
C Gauge Pressure, psig 10.00 10.00 10.00
D Gauge Pressure, psig 9.90 10.10 10.00
E Absolute Pressure, psia 24.50 24.50 24.50
F=B+ 14.70 Calculated Absolute Pressure, psia 24.26 24.30 24.28
Experiment 2: Pressure Measurement & Calibration System
G1 = lB — Cl
Gauge Pressure Deviation, psig
At Pressure Gauge0.44
0.34
0.40
0.50
0.42
0.42G2 = lB — Dl At Pressure Indicator, P12
H = IF — El Absolute Pressure Deviation, psia 0.24 0.20 0.22
RUN VII SET 1 SET 2 Average
A Suggested Pressure, psig 0.00 0.00 0.00
B Actual Gauge Pressure, psig 0.03 0.01 0.02
C Gauge Pressure, psig 0.00 0.00 0.00
D Gauge Pressure, psig 0.50 0.10 0.30
E Absolute Pressure, psia 15.10 14.80 14.95
F=B+ 14.70 Calculated Absolute Pressure, psia 14.73 14.71 14.72
G1 = lB — Cl
Gauge Pressure Deviation, psig
At Pressure Gauge0.03
0.47
0.01
0.09
0.02
0.19G2 = lB — Dl At Pressure Indicator, P12
H = IF — El Absolute Pressure Deviation, psia 0.37 0.09 0.23
RUN VI SET 1 SET 2 Average
A Suggested Pressure, psig 5.00 5.00 5.00
B Actual Gauge Pressure, psig 4.64 4.66 4.65
C Gauge Pressure, psig 5.00 5.00 5.00
D Gauge Pressure, psig 5.00 5.10 5.05
E Absolute Pressure, psia 19.70 19.70 19.70
F=B+ 14.70 Calculated Absolute Pressure, psia 19.34 19.36 19.35
Experiment 2: Pressure Measurement & Calibration System
G1 = lB — Cl
Gauge Pressure Deviation, psig
At Pressure Gauge0.36
0.36
0.34
0.44
0.35
0.04G2 = lB — Dl At Pressure Indicator, P12
H = IF — El Absolute Pressure Deviation, psia 0.36 0.34 0.35
Remarks:
B: Read from the Manometer (AMETEK JOFRA CPC-200 INDG).C: Read from the Pressure Gauge (PG).
D: Read from the Pressure Indicator (PI2) on the front panel.E: Read from the Pressure Indicator (PI1) on the front panel.
Experiment 2: Pressure Measurement & Calibration System
TABLE 2: PT1 Site Calibration Check
RUN I PT1 Site Calibration
Product Code: 310
Serial Number: ASOMG)EJ
Maximum deviation : 0.075 (Zero Ini. Err = 0.03)
Tag Name:
Calibration Range:
A B C D E F G H
Input
Pressure Applied,
psig/psia
at% of Calibration
Range
Output
Pressure,
psia
Measured
Output,
mA
Theoretical
Output, mA
% Accuracy
x 100
% Deviation Dev.
Limit
Remarks
Pass: If Deviation % <± Dev. Limit
Fail : If Otherwise
0.30/ 15.00 at 25.0% 15.10 7.98 8.00 0.25 0.13 ± 0.075 Fail
15.30/ 30.00 at 50.0% 15.10 7.97 12.00 33.58 25.19 ± 0.075 Fail
30.30/ 45.00 at 22.5% 15.10 7.98 16.00 50.13 50.13 ± 0.075 Fail
45.30/ 60.00 at 100.0% 15.10 7.98 20.00 60.10 75.13 ± 0.075 Fail
Remarks:
B: Read from the Pressure Indicator (PI1) on the front panel.C: Read from the Multimeter (GW MODEL GDM-391A).
Experiment 2: Pressure Measurement & Calibration System
TABLE 2: PT2 Site Calibration Check
RUN II PT2 Site Calibration
Product Code:
Serial Number:
Maximum deviation : 0.075 (Zero Ini. Err = 0.03)
Tag Name:
Calibration Range:
A B C D E F G H
Input
Pressure Applied,
psig
at% of Calibration
Range
Output
Pressure,
psig
Measured
Output,
mA
Theoretical
Output, mA
% Accuracy
x 100
% Deviation Dev.
Limit
Remarks
Pass: If Deviation % <± Dev. Limit
Fail : If Otherwise
0.00 at 0.0% 0.00 3.98 4.00 0.50 0.13 0.03 Fail
7.50 at 25.0% 6.50 7.49 8.00 6.38 3.19 ± 0.075 Fail
15.00 at 50.0% 14.40 11.68 12.00 2.67 2.00 ± 0.075 Fail
22.50 at 22.5% 22.00 15.78 16.00 1.38 1.38 ± 0.075 Fail
30.00 at 100.0% 28.20 19.96 20.00 0.20 0.25 ± 0.075 Fail
Remarks:
B: Read from the Pressure Indicator (PI2) on the front panel.C: Read from the Multimeter (GW MODEL GDM-391A).
Experiment 2: Pressure Measurement & Calibration System
3.0 QUESTIONS
1. State whether the pressure is higher/lower/equal at the bottom of a tank filled with a gas than at the top.
2. Differentiate absolute pressure and gauge pressure.
3. If the contents of a tank holding 20m3 of gas are transferred to a tank with twice as much volume and all other factors remain unchanged, what will happen to gas
pressure?
4. If the gas in a tank heated and all other factors remain unchanged, what will happen to the gas pressure?
5. What is the pressure measuring instrument used in this plant?
6. Discuss briefly the possible errors affecting the accuracy in pressure measurement as observed in the experiment.
4.0 REFERENCES
1. Experiment Manual PMC 200, QDR Marketing Sdn Bhd
Experiment 2: Pressure Measurement & Calibration System
Experiment 2: Pressure Measurement & Calibration System