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6 | Operation
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IRwin-Operating-instructions-mina66en1-15-(1904)
6.3.11 IR Ethane Analysis and compensation
Incorrect Ethane compensation value can result in significant deviation in the
estimated methane concentration, in the operating modes "Above Ground", "Bar
Hole", "Confined Space" and "Gas Purity".
Why an IR Ethane
Analysis?
This function is mainly used to distinguish between natural gas and swamp gas from
underground biological decay. Natural gas contains varying concentrations of ethane
while swamp gas does not.
Such analysis is traditionally made with a gas chromatograph. With IRwin the same
analysis with similar sensitivity is performed much faster. Instead of the typical 5 to 10
minutes a gas chromatograph requires for an analysis IRwin only needs a few
seconds.
The second purpose of the IR-Ethananalyse is to establish the ethane concentration
for compensation at high methane levels.
The IR-Ethananalyse can be made from below 1 to 8 Vol% ethane in the natural gas.
The resolution is 0.1% and the accuracy better than 1 Vol%.
INFICON single-cell
wide range technology
(patent-pending)
IRwin methane leak detector employs the unique INFICON single-cell wide range
technology to detect all concentrations from 1 ppm to 100 Vol% methane. This
technology is very sensitive to the ethane content in the natural gas. Therefore, large
deviations can occur at higher gas concentrations if the ethane concentration is not
compensated for.
The leak detector has a built-in routine for ethane compensation. The ethane content
can be entered manually, if known. A more practical way is to use the IR-
Ethananalyse function to measure the ethane content and automatically set the
compensation concentration. The safety certified modes Ex and Ex Tox are not
affected by this phenomenon.
IRwin SXG and SXGT models also have GC Ethane Analysis capability for
distinguishing between Natural gas (NG), liquid petroleum gas (LPG) and swamp gas
by determining the presence of methane, ethane and propane in the sampled gas.
The GC Ethane Analysis function is not affecting the ethane compensation.
6.3.11.1 Entering ethane concentration manually
If you know the current ethane concentration in your natural gas you can enter this
value manually. We recommend, however, that you use the built-in IR-Ethananalyse
to determine the ethane concentration as this typically varies from day to day and from
location to location.
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Содержание 580-000
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