NGL Gallons by Component

                                                

A volume of natural gas can be converted to its liquefiable hydrocarbon components (ethane, propane, etc) by using Mol% or GPM from the compositional analysis of the stream of natural gas.

Formula Definitions:

Cf/Mol = number of cubic feet in a Mol (see Note below)

Gal/#Mol = gallons per pound Mol

Note: The number of cubic feet in a Mol is pressure base sensitive.  The standard per the Gas Processors Association is 379.49 cubic feet at a pressure base of 14.696.  The formula to convert the standard to a different pressure base is as follows:

379.49 times (14.696 divided by PT)

Table 7 – the number of cubic feet per Mol at different pressure bases.

Pressure

Base

Cf/Mol

Factor
14.65 380.68157
14.696 379.49000
14.73 378.61406
15.025 371.18037
Table 8 – the number of gallons per pound Mol by component.

Component

Gal/#Mol
N2 Nitrogen 4.1513
CO2 Carbon Dioxide 6.4532
H2S Hydrogen Sulfide 5.1005
C1 Methane 6.4142
C2 Ethane 10.1259
C3 Propane 10.4327
IC4 Isobutane 12.3859
NC4 Normal Butane 11.9371
IC5 Isopentane 13.8595
NC5 Normal Pentane 13.7130
C6+ Hexane+ 16.3920

Formulas:

Mcf times GPM for the component = Gallons

Mcf times [(Mol% divided by 100) divided by Cf/Mol] times 1000 times Gal/#Mol = Gallons  

Calculation Examples:

       1,000 Mcf @ 14.73 times 3.0088 GPM C2 = 3,009 Gallons of C2 (Ethane)

1000 Mcf @ 14.73 times [(11.25 Mol% C2 divided by 100) divided by 378.61406] times 1000 times 10.1259=3,009 Gallons of C2 (Ethane)

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Last updated on March 27, 2002