This document contains 6 questions and solutions related to gas processing. It provides the composition of a gas and asks to calculate hydrate formation temperature, minimum expansion temperature and pressure, and inhibitor injection rates. The solutions use figures from gas processing references to interpolate properties and calculate values like specific gravity. References for gas conditioning and processing engineering data books are also listed.

1. Tripoli University
Faculty of Engineering
Chemical Engineering department
Subject
Gas Processors
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B. SC:
Hassan Salem Bin-Najma

2. Q1 - Calculate the temperature for hydrate formation at 1000 psia for a gas with the following composition
80% C1 , 10% C2 , 5% C3 , 5% N2. Use Katz and shortcut method ?
Solution
Katz method
shortcut method
1

3. Q2 – what is the minimum temperature The will permit expansion of the will permit expansion of the above gas
to 400 psia ?
Solution
From Fig 20-14 (sp.gr 1= 0.6) at ( P1=1000 psia and P2=400 psia ) = T1 = 77 °F
From Q1 sp.gr = 0.6714 T = ? °F
From Fig 20-15 (sp.gr 2 = 0.7) at ( P1=1000 psia and P2=400 psia ) = T2 = 102 °F
Interpolating at T1 and T2
Q3 – what is the minimum expansion pressure of the above gas that can be used without hydrate formation ?
Solution
From Fig 20-14 (sp.gr 1= 0.6) at ( P1=1000 psia and T1 = 80 °F ) = P1 = 340 psia
From Q1 sp.gr = 0.6714 P2 = ? psia
From Fig 20-15 (sp.gr 2 = 0.7) at ( P1=1000 psia and T1 = 80 °F ) = P2 = 800 psia
Interpolating at P1 and P2
2
102 - 77
=
T - 77
T = 94.85 °F
0.7 - 0.6 0.6714 - 0.6
800 - 340
=
P - 340
P = 688.44 psia
0.7 - 0.6 0.6714 - 0.6

4. Q 4 – estimate the inhibitor injection volume rate required to prevent hydrate formation for 80% C1 ,
15% C2 , 5% N2 the Pipe Line on the surface of the earth ?
Solution
32 °F ˃ 14 °F for DEG
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compnent yi MWi yi * MWi
C1 0.8 16.04276 12.83421
C2 0.15 30.06964 4.510446
N2 0.05 28.01348 1.400674
Totals 1
avg MWi 18.74533

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7. Q 5 – estimate the inhibitor injection volume rate required to prevent hydrate formation ?
Solution
20 °F ˃ 14 °F for DEG
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9. Q 6 – estimate the inhibitor injection volume rate required to prevent hydrate formation ?
Solution
-8 °F ˂ 14 °F for MeoH
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11. Reference
1- Gas-Conditioning-Processing-Vol-1-campbell
2- GPSA - Gas Processors Suppliers Association, Engineering Data Book (12th Ed)
Excel Solution And Aspen Plus Or Hysys : Gas Processors Q1 , Q2 , Q3 for
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hassansalem70@yahoo.com
Excel Solution And Aspen Plus Or Hysys : Gas Processors Q4 , Q5 , Q6 for
hassanbnjm074@gmail.com
hassansalem70@yahoo.com