Evaluasi Gas Chromatograph

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THE EVALUATION OF NATURAL GAS COMPOSITION ANALYSIS FROM GAS CHROMATOGRAPH in PT PGN SBU II East Java Dea Amelia TEG II 360902/B

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Evaluasi Gas Chromatograph

Transcript of Evaluasi Gas Chromatograph

Page 1: Evaluasi Gas Chromatograph

THE EVALUATION OF NATURAL GAS COMPOSITION ANALYSIS

FROM GAS CHROMATOGRAPHin PT PGN SBU II East Java

Dea AmeliaTEG II

360902/B

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How Does Danalyzer Operate?

Analysis Result from DanalyzerManual Calculation Refers to

Old GPA and Latest GPA Standard

Calculations Comparisons

Conclusion and Recommendation

Danalyzer’s Specification

CONTENT

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DANALYZER’SSPECIFICATION

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Danalyzer Gas Chromatograph System with Model 2350 Controller

• Sample requirements : fluid phase: vapor; pressure: 15 to 30 psig, regulated to ±10%; flow rate: 50 cc/min, typical

• Carrier Gas : Zero grade helium (99.995% pure, with less than 5ppm water, and less than 0.5 ppm hydrocarbons)

• Column : OD 1/16”, ID 0.005” ; temperature 78-830C

• Detector Thermal Conductivity Detector (TCD) operating temperature 73-780C

• Cycle time 240 seconds

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HOW DOES DANALYZER OPERATE?

Daniel C6+.exe

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ANALYSIS RESULT FROM DANALYZER

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Chromatogram

C6+

C3

nC4

iC4

iC5 nC5

N2

C1

CO2 C2

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No. Component NameMole

PercentGallons/1000 scf

BTU Gross(BTU/scf)

Relative Density

1 C6+ 0.0676 0.0301 3.5700 0.0022

2 Propane 0.4723 0.1302 11.9100 0.0072

3 i-Butane 0.0909 0.0297 2.9600 0.0018

4 n-Butane 0.1073 0.0338 3.5100 0.0022

5 NeoPentane 0.0000 0.0000 0.0000 0.0000

6 i-Pentane 0.0408 0.0149 1.6400 0.0010

7 n-Pentane 0.0284 0.0103 1.1400 0.0007

8 Nitrogen 0.5077 0.0556 0.0000 0.0049

9 Methane 96.8801 16.4212 980.7200 0.5366

10 Carbon Dioxide 0.6614 0.1127 0.0000 0.0101

11 Ethane 1.1437 0.3059 20.2800 0.0119

Total 100.0000 0.5550 1025.7300 0.5786

Analysis Result

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MANUAL CALCULATION REFERS TO OLD GPA

STANDARD AS USED IN DANALYZER

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• GPA Standard 2261-89 “Analysis for Natural Gas and Similar Gaseous by Gas Chromatography”

• GPA Standard 2172-86 “Calculation of Gross Heating Value, Relative Density, and Compressibility Factor for Natural Gas Mixtures from Compositional Analysis”

• GPA Standard 2145-89 “Table of Physical Properties for Hydrocarbons and Other Compounds of Interest to The Natural Gas Industry”

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Standard GasNo. Component

Calibration Concentration (%)

Peak AreaResponse

Factor

1 C6+ 0.03 74174.10 2.47E+06

2 Propane 0.999 1509688.80 1.51E+06

3 i-Butane 0.3 522534.00 1.74E+06

4 n-Butane 0.3 531852.00 1.77E+06

5 NeoPentane 0.0999 200255.54 2.00E+06

6 i-Pentane 0.0999 194827.98 1.95E+06

7 n-Pentane 0.0999 200231.57 2.00E+06

8 Nitrogen 2.496 2449150.08 9.81E+05

9 Methane 89.576 66309977.64 7.40E+05

10 Carbon Dioxide 1 1084720.00 1.08E+06

11 Ethane 4.999 4556838.45 9.12E+05Total 100

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Composition CalculationNo.

Component Name

Peak AreaResponse

Factor%Mol

Unnormalized%Mol

Normalized

1 C6+ 174040.00 2.47E+06 0.070391147 0.070611

2 Propane 712900.00 1.51E+06 0.471744309 0.473215

3 i-Butane 157208.00 1.74E+06 0.090257093 0.090539

4 n-Butane 188848.00 1.77E+06 0.106522867 0.106855

5 NeoPentane 0,00 2.00E+06 0 0

6 i-Pentane 77928.00 1.95E+06 0.039958364 0.040083

7 n-Pentane 55296.00 2.00E+06 0.027588409 0.027674

8 Nitrogen 473277.00 9.81E+05 0.48233034 0.483834

9 Methane 71603800.00 7.40E+05 96.72725308 97.02886

10 Carbon Dioxide 720112.00 1.08E+06 0.663869017 0.665939

11 Ethane 919976.00 9.12E+05 1.009243596 1.012391

Total 99.68915822 100

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Relative Density and Heating Value Calculation

No. Component Name Xi Gi Xi.Gi Hvi Xi.Hvi

1 C6+ 0.000706 3.2544 0.002298 5281.065 3.728994

2 Propane 0.004732 1.5226 0.007205 2521.921 11.93412

3 i-Butane 0.000905 2.0068 0.001817 3259.423 2.951034

4 n-Butane 0.001069 2.0068 0.002144 3269.848 3.493996

5 NeoPentane 0 2.4912 0 3994.22 0

6 i-Pentane 0.000401 2.4912 0.000999 4010.156 1.607389

7 n-Pentane 0.000277 2.4912 0.000689 4018.175 1.112007

8 Nitrogen 0.004838 0.96723 0.00468 0 0

9 Methane 0.970289 0.55392 0.537462 1012.337 982.2587

10 Carbon Dioxide 0.006659 1.5196 0.01012 0 0

11 Ethane 0.010124 1.0382 0.010511 1773.794 17.95773

Total 1 0.577925 1025.044

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MANUAL CALCULATION REFERS TO LATEST GPA STANDARD

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• GPA Standard 2261-00 “Analysis for Natural Gas and Similar Gaseous by Gas Chromatography”

• GPA Standard 2172-96 “Calculation of Gross Heating Value, Relative Density, and Compressibility Factor for Natural Gas Mixtures from Compositional Analysis”

• GPA Standard 2145-09 “Table of Physical Properties for Hydrocarbons and Other Compounds of Interest to The Natural Gas Industry”

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Standard GasNo. Componen

Calibration Concentration

Peak Area Response Factor

1 C6+ 0.03 74174.10 4.04E-07

2 Propane 0.999 1509688.80 6.62E-07

3 i-Butane 0.3 522534.00 5.74E-07

4 n-Butane 0.3 531852.00 5.64E-07

5 NeoPentane 0.0999 200255.54 0.00E+00

6 i-Pentane 0.0999 194827.98 5.13E-07

7 n-Pentane 0.0999 200231.57 4.99E-07

8 Nitrogen 2.496 2449150.08 1.02E-06

9 Methane 89.576 66309977.64 1.35E-06

10 Carbon Dioxide 1 1084720.00 9.22E-07

11 Ethane 4.999 4556838.45 1.10E-06

Total 100

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Composition CalculationNo.

Component Name

Peak AreaResponse

Factor% Mol

Unnormalized% Mol

Normalized

1 C6+ 174040.00 4.04E-07 0.070391147 0.070611

2 Propane 712900.00 6.62E-07 0.471744309 0.473215

3 i-Butane 157208.00 5.74E-07 0.090257093 0.090539

4 n-Butane 188848.00 5.64E-07 0.106522867 0.106855

5 NeoPentane 0.00 0.00E+00 0 0

6 i-Pentane 77928.00 5.13E-07 0.039958364 0.040083

7 n-Pentane 55296.00 4.99E-07 0.027588409 0.027674

8 Nitrogen 473277.00 1.02E-06 0.48233034 0.483834

9 Methane 71603800.00 1.35E-06 96.72725308 97.02886

10 Carbon Dioxide 720112.00 9.22E-07 0.663869017 0.665939

11 Ethane 919976.00 1.10E-06 1.009243596 1.012391

Total 99.68915822 100

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Relative Density and Heating Value Calculation

No. Component Name Xi Gi Xi.Gi Hvi Xi.Hvi

1 C6+ 0.000706 3.2544 0.002298 5281.065 3.728994

2 Propane 0.004732 1.5225 0.007205 2521.921 11.93412

3 i-Butane 0.000905 2.0068 0.001817 3259.423 2.951034

4 n-Butane 0.001069 2.0068 0.002144 3269.848 3.493996

5 NeoPentane 0 2.4911 0 3993.718 0

6 i-Pentane 0.000401 2.4911 0.000999 4010.156 1.607389

7 n-Pentane 0.000277 2.4911 0.000689 4017.974 1.111952

8 Nitrogen 0.004838 0.9672 0.00468 0 0

9 Methane 0.970289 0.5539 0.537443 1012.337 982.2587

10 Carbon Dioxide 0.006659 1.5195 0.010119 0 0

11 Ethane 0.010124 1.0382 0.010511 1773.794 17.95773

Total 1 0.577904 1025.044

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CALCULATIONS COMPARISONS

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ParameterAnalysis by Danalyzer

Manual Analysis Refers to Old Standard

Deviation

%Mol Unnormalized 99.705 99.68915822 -0,01588865 %

Relative Density 0.5786 0.577924717 -0,116709899 %

Heating Value 1025.73 1025.044004 -0,066878805 %

The Comparison between Analysis of Danalyzer and

Manual Analysis Refers to Old Standard

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ParameterAnalysis by Danalyzer

Manual Analysis Refers to Latest

StandardDeviation

%Mol Unnormalized 99.705 99.68915822 -0.01588865 %

Relative Density 0.5786 0.577903959 -0.120297495 %

Heating Value 1025.73 1025.043949 -0.066884214 %

The Comparison between Analysis of Danalyzer and

Manual Analysis Refers to Latest Standard

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The Comparison between Manual Analysis Refers to Old Standard and Manual Analysis Refers to Latest Standard

ParameterManual Analysis

Refers to Old Standard

Manual Analysis Refers to Latest

StandardDeviation

%Mol Unnormalized 99.68915822 99.68915822 0 %

Relative Density 0.577924717 0.577903959 -0.003591789 %

Heating Value 1025.044004 1025.043949 -0.00000541215 %

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CONCLUSION AND

RECOMMENDATION

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Conclusion

• Analysis of the composition and physical properties of natural gas in PT PGN (Persero) Tbk. using Danalyzer Gas Chromatograph Model 2350 System Controller with the reference calculations are still using GPA Standard 2261-89, GPA 2172-86, and GPA 2145-89 or standards that have not been revised.

• Based on Danalyzer’s analysis on Thursday, February 11, 2010 at 11:01 o'clock at the offtake stations Gresik, the natural gas flow has methane content of 96.88%, with relative density of 0.5786 and GHV amounted to 1025.73 BTU / scf.

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• There are small deviations between the results of natural gas composition analysis by Danalyzer and manual calculations.

• There are only small deviations between calculated composition of natural gas by GPA Standard 2261-89, 2172-86 GPA, and GPA 2145-89 with the calculation by GPA Standard 2172-96, 2145-09 GPA, and GPA 2261-00, so the results of Danalyzer calculation are still acceptable.

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Recommendation

• The routine maintenance of Danalyzer Gas Chromatograph with Model 2350 Controller System in off-take station in accordance with the Standard Operation Procedure should be further enhanced. 

• Although there are only small deviations between the calculation by old references and new references, but PGN should be able to respond this differences because the results of this analysis affects the custody transfer between PGN and suppliers, and distributed gas quality assurance. 

• Revisions or updates should be performed against the reference standard used by Danalyzer. 

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THE END

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THE FORMULAS

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Calculate Response Factor

WhereK = Response factorAs = Peak area of standard

componentCs = Mol Percent of standard

component

s

s

C

A K

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Calculate Mol Percent

Where :Cx = Mol Percent of component X

Ax = Peak area of component X

K = Response factor

K

A C x

x

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Normalized Mol Percent

The unnormalized total should not vary more than ±1% from 100%. If so, sheck for possible errors or change in operating conditions of instrument between sample and reference standard run.

edunnormaliz

edunnormaliznormalized

%mol

Xcomponent %mol %mol

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Calculate Relative Density

Where :G = Relative densityXi = Mol fraction of sample component

Gi = Relative density of sample component

n

1iiiGX G

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Calculate Heating Value

Where :Hv = Heating valueXi = Mol fraction of sample

componentHvi = Heating value of sample

component

n

1iiiHvX Hv