The gas in Question 1 goes through a choke at the surface with free water present...

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The gas in Question 1 goes through a choke at the surface with free water present under following conditions. Upstream of the choke : P = 2500 psi 100 F T= (i) At 100 F determine the lowest pressure this gas can be expanded to across the choke without hydrate formation (ii) At 2000 psi what is the lowest temperature in the flow line before hydrates form Use data provided at the end. Please explain how you calculate your answers MW of Air = 28.97 Ib/lb mole 10,000 8000 168 INITIAL 6000 TEMPERATURE "FL 5000 4000 3000 FI50 2000 120 100 90 1000 800 60 600 70 500 60 400 300 200 40 100 100 200 300 400 600 800 1000 2000 4000 FINAL PRESSURE, psia INITIAL PRESSURE, psio 0.065 0.06 0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 Pressure (psia) 00001 0006 -0008 Viscos ity (cp) 700 F 9000 Enthalpy-entropy diagram + for 0.7 gravity natural gas 8000 600, 7000- pPc à 667 psia, pTc = 392° R 500 6000 500 5000 400. 4000 300 3000 200 2000 100 1000 200 32 F 100 - 1000 -2000 8 10 12 -14 -12 -10 -8 -6 -4 -2 0 2 4 Entropy, Btu per pound-mole per degree 0002 os 5000 ersd 000'01 000i pool 300 Enthalpy, Btu per pound-mole The gas in Question 1 goes through a choke at the surface with free water present under following conditions. Upstream of the choke : P = 2500 psi 100 F T= (i) At 100 F determine the lowest pressure this gas can be expanded to across the choke without hydrate formation (ii) At 2000 psi what is the lowest temperature in the flow line before hydrates form Use data provided at the end. Please explain how you calculate your answers MW of Air = 28.97 Ib/lb mole 10,000 8000 168 INITIAL 6000 TEMPERATURE "FL 5000 4000 3000 FI50 2000 120 100 90 1000 800 60 600 70 500 60 400 300 200 40 100 100 200 300 400 600 800 1000 2000 4000 FINAL PRESSURE, psia INITIAL PRESSURE, psio 0.065 0.06 0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 Pressure (psia) 00001 0006 -0008 Viscos ity (cp) 700 F 9000 Enthalpy-entropy diagram + for 0.7 gravity natural gas 8000 600, 7000- pPc à 667 psia, pTc = 392° R 500 6000 500 5000 400. 4000 300 3000 200 2000 100 1000 200 32 F 100 - 1000 -2000 8 10 12 -14 -12 -10 -8 -6 -4 -2 0 2 4 Entropy, Btu per pound-mole per degree 0002 os 5000 ersd 000'01 000i pool 300 Enthalpy, Btu per pound-mole The gas in Question 1 goes through a choke at the surface with free water present under following conditions. Upstream of the choke : P = 2500 psi 100 F T= (i) At 100 F determine the lowest pressure this gas can be expanded to across the choke without hydrate formation (ii) At 2000 psi what is the lowest temperature in the flow line before hydrates form Use data provided at the end. Please explain how you calculate your answers MW of Air = 28.97 Ib/lb mole 10,000 8000 168 INITIAL 6000 TEMPERATURE "FL 5000 4000 3000 FI50 2000 120 100 90 1000 800 60 600 70 500 60 400 300 200 40 100 100 200 300 400 600 800 1000 2000 4000 FINAL PRESSURE, psia INITIAL PRESSURE, psio 0.065 0.06 0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 Pressure (psia) 00001 0006 -0008 Viscos ity (cp) 700 F 9000 Enthalpy-entropy diagram + for 0.7 gravity natural gas 8000 600, 7000- pPc à 667 psia, pTc = 392° R 500 6000 500 5000 400. 4000 300 3000 200 2000 100 1000 200 32 F 100 - 1000 -2000 8 10 12 -14 -12 -10 -8 -6 -4 -2 0 2 4 Entropy, Btu per pound-mole per degree 0002 os 5000 ersd 000'01 000i pool 300 Enthalpy, Btu per pound-mole The gas in Question 1 goes through a choke at the surface with free water present under following conditions. Upstream of the choke : P = 2500 psi 100 F T= (i) At 100 F determine the lowest pressure this gas can be expanded to across the choke without hydrate formation (ii) At 2000 psi what is the lowest temperature in the flow line before hydrates form Use data provided at the end. Please explain how you calculate your answers MW of Air = 28.97 Ib/lb mole 10,000 8000 168 INITIAL 6000 TEMPERATURE "FL 5000 4000 3000 FI50 2000 120 100 90 1000 800 60 600 70 500 60 400 300 200 40 100 100 200 300 400 600 800 1000 2000 4000 FINAL PRESSURE, psia INITIAL PRESSURE, psio 0.065 0.06 0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 Pressure (psia) 00001 0006 -0008 Viscos ity (cp) 700 F 9000 Enthalpy-entropy diagram + for 0.7 gravity natural gas 8000 600, 7000- pPc à 667 psia, pTc = 392° R 500 6000 500 5000 400. 4000 300 3000 200 2000 100 1000 200 32 F 100 - 1000 -2000 8 10 12 -14 -12 -10 -8 -6 -4 -2 0 2 4 Entropy, Btu per pound-mole per degree 0002 os 5000 ersd 000'01 000i pool 300 Enthalpy, Btu per pound-mole The gas in Question 1 goes through a choke at the surface with free water present under following conditions. Upstream of the choke : P = 2500 psi 100 F T= (i) At 100 F determine the lowest pressure this gas can be expanded to across the choke without hydrate formation (ii) At 2000 psi what is the lowest temperature in the flow line before hydrates form Use data provided at the end. Please explain how you calculate your answers MW of Air = 28.97 Ib/lb mole 10,000 8000 168 INITIAL 6000 TEMPERATURE "FL 5000 4000 3000 FI50 2000 120 100 90 1000 800 60 600 70 500 60 400 300 200 40 100 100 200 300 400 600 800 1000 2000 4000 FINAL PRESSURE, psia INITIAL PRESSURE, psio 0.065 0.06 0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 Pressure (psia) 00001 0006 -0008 Viscos ity (cp) 700 F 9000 Enthalpy-entropy diagram + for 0.7 gravity natural gas 8000 600, 7000- pPc à 667 psia, pTc = 392° R 500 6000 500 5000 400. 4000 300 3000 200 2000 100 1000 200 32 F 100 - 1000 -2000 8 10 12 -14 -12 -10 -8 -6 -4 -2 0 2 4 Entropy, Btu per pound-mole per degree 0002 os 5000 ersd 000'01 000i pool 300 Enthalpy, Btu per pound-mole The gas in Question 1 goes through a choke at the surface with free water present under following conditions. Upstream of the choke : P = 2500 psi 100 F T= (i) At 100 F determine the lowest pressure this gas can be expanded to across the choke without hydrate formation (ii) At 2000 psi what is the lowest temperature in the flow line before hydrates form Use data provided at the end. Please explain how you calculate your answers MW of Air = 28.97 Ib/lb mole 10,000 8000 168 INITIAL 6000 TEMPERATURE "FL 5000 4000 3000 FI50 2000 120 100 90 1000 800 60 600 70 500 60 400 300 200 40 100 100 200 300 400 600 800 1000 2000 4000 FINAL PRESSURE, psia INITIAL PRESSURE, psio 0.065 0.06 0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 Pressure (psia) 00001 0006 -0008 Viscos ity (cp) 700 F 9000 Enthalpy-entropy diagram + for 0.7 gravity natural gas 8000 600, 7000- pPc à 667 psia, pTc = 392° R 500 6000 500 5000 400. 4000 300 3000 200 2000 100 1000 200 32 F 100 - 1000 -2000 8 10 12 -14 -12 -10 -8 -6 -4 -2 0 2 4 Entropy, Btu per pound-mole per degree 0002 os 5000 ersd 000'01 000i pool 300 Enthalpy, Btu per pound-mole

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