Processing A Sample; Hydrocarbons; Table 2-1 Hydrocarbons - ABB NGC8206 User Manual

2.2 Processing a Sample

A natural gas sample is extracted from the pipeline, processed for particulate
removal and phase integrity by the sample conditioning module (optional as
required), transported to the NGC and injected onto the chromatographic columns
where component separation occurs.
The NGC analyzes each sample, utilizing established chromatographic
techniques. The resulting information consists of mole percent values for each
component. These values are used to perform energy calculations. Calculated
values include: gas compressibility, real relative density, Btu/CV value, liquid
GPM, Wobbe index, methane number and several other optional calculated
values. Gas compressibility selections include NX-19, AGA-8 detail, single virial
summation factor, ISO summation factor and none (a factor of one is used).
The processed sample is then vented with the carrier gas and results are stored in
memory and communicated to other devices, as needed. All of these values, as
well as composition, are available on various Modbus communication protocols.
2.2.1

Hydrocarbons

To further define the natural gas components,
for each hydrocarbon. Among the key information is the boiling point of the
component. The boiling point of each component correlates to the order each
component will exit the column.
Molecular
Formula
C1H4
C2H4
C2H6
C3H6
C3H8
C4H10
C4H8
C4H10
C5H12
C5H12
C5H12
C6H14
C7H16
C8H18
C9H20
C10H22
Page 2–4
Table 2–1 Hydrocarbons
Common Abbreviation
C1
C2=
C2
C3=
C3
IC4
C4=
C4
NeoC5
IC5
C5
C6
C7
C8
C9
C10
Table 2–1 gives additional details
Component
Methane
Ethylene
Ethane
Propylene
Propane
Isobutane
Butylene
Butane
Neopentane
Isopentane
Pentane
Hexane
Heptane
Octane
Nonane
Decane
Boiling Point
-161.60
-103.75
-88.65
-47.65
-42.05
-11.65
-6.95
-.45
9.85
27.85
34.85
68.85
97.85
125.55
150.95
173.95
2101510 Rev. AG