MEG Requirement for Hydrate Inhibition

Reference (Quanta E-Library)Book 19.5 H K AbdelBook 19.9 Kidnay & Parish Yellow cells are user inputs.Book 19.14 GPSA engg. Data bookBook 19.16 NG engg HB

Detail Unit Value ReferenceData

Gas flow rate MMscf 15Gas specific gravity - 0.669p1 psig 1000

psia 1014.7T1 °C 20

68p2 psig 1000

psia 1014.7T2 °C -10

14Condensed H/C m3/hr 1.2362 PROII after considering 7% higher actual densityGas density kg/m3 1

Hydrate Formation TemperatureTd - Analytical 63.8 Eq 3.1a, Book 19.9

°C 17.6Td - Graphical

Considered Td °C 17.6Dew point depression required °C 27.6

81.8Water content of the gas

TabularAt p1, T1 lb/MMscf 24.4 Table 8-1, Book 19.16

kg/hr 6.9At p2, T2 lb/MMscf 4.1

kg/hr 1.2Water condensation lb/MMscf 20.3

kg/hr 5.8GraphicalAt p1, T1 lb/MMscf

At p2, T2 lb/MMscflb/MMscf

Glycol RequirementInhibitor - MEGInhibitor MW - 62K value - 2350Required inhibitor conc. wt% 68.3

Injection glycol conc. wt% 80Aq glycol quantity lb/MMscf 142.8

kg/hr 40.5Glycol liquid H/C loss kg/hr 0.04 Page 46, Book 19.9, p20-20 Book 14.14Glycol vapor pressure at T2 mmHg 2.66Glycol vapor loss kg/hr 0.9Design margin % 100.0 Page 1005, Book 19.4Considered aq. glycol solution kg/hr 82.9

°F

°F

°F

°F Fig 1, Book 19.5; Fig. 3.8 Book 19.9; Fig. 20-19, Book 19.14

°F

Fig. 6.1, Book 19.9; Fig. 2, book 19.5; Fig 20-4 Book 19.14

Eq 2, Book 19.5; Eq. 3.2b, Book 19.9; Eq. 12.16, Book 19.16; Eq 20-6, Book 19.14

MEG 62DEG 106TEG 150

Methanol Requirement for Hydrate Inhibition

Reference (Quanta E-Library)Book 19.4 Kohl & NielsonBook 19.5 H K Abdel Yellow cells are user inputs.Book 19.9 Kidnay & ParishBook 19.14 GPSA engg. Data bookBook 19.16 NG engg HB

Detail Unit Value ReferenceData

Gas flow rate MMscf 15Gas specific gravity - 0.655p1 psig 1000

psia 1014.7T1 °C -10

14p2 psig 1000

psia 1014.7T2 °C -60

-76Condensed H/C kmol/hr 92 PROII

Hydrate Formation TemperatureTd - Analytical 63.1 Eq 3.1a, Book 19.9

°C 17.3Td - Graphical

Considered Td °C 17.3Dew point depression required °C 77.3

171.1Water content of the gas

TabularAt p1, T1 lb/MMscf 1.1 Table 8-1, Book 19.16

kg/hr 0.3At p2, T2 lb/MMscf 0.5

kg/hr 0.1Water condensation lb/MMscf 0.6

kg/hr 0.17GraphicalAt p1, T1 lb/MMscf

At p2, T2 lb/MMscflb/MMscf

Methanol RequirementInhibitor - MethanolInhibitor MW - 32K value - 2350Required inhibitor conc. wt% 70.0

- Not Valid

Inhibitor water conc. mol fra 0.27Required inhibitor conc. wt% 83.0

- Not Valid Eq 20.7 Book 19.14; Eq 3.3 Book 19.9

wt% 80.0 Fig 20-64, Book 19.14; Fig. 11-45, Book 19.4

Methanol required for DPD kg/hr 0.680.10 Fig 3.9, Book 19.9; Fig. 20-65, Book 19.14

kg/hr 2.3mol% 1.255 Eq 11-8, Book 19.4

mol% 0.2 Fig. 3.10, Book 19.9; Fig. 20-66, Book 19.14

Considered loss in Liq H/C mol% 0.2kg/hr 5.9

Design margin % 50.0

°F

°F

°F

°F Fig 1, Book 19.5; Fig. 3.8 Book 19.9; Fig. 20-19, Book 19.14

°F

Fig. 6.1, Book 19.9; Fig. 2, book 19.5; Fig 20-4 Book 19.14

Eq 2, Book 19.5; Eq. 3.2b, Book 19.9; Eq. 12.16, Book 19.16; Eq 20-6, Book 19.14

Equation validity for inhibitor conc.

Equation validity for inhibitor conc.Graphical required inhibitor conc.

Methanol loss in vapor phase at T2,p2

lb/MMscf/wt% MeOH

Analytical Methanol loss in condensed phase at T2Graphical Methanol loss in condensed phase at T2

kg/hr 13.3Considered 100%methanol solution

MEG 62DEG 106TEG 150