ASTM D1946-90(2006)
(Practice)Standard Practice for Analysis of Reformed Gas by Gas Chromatography
Standard Practice for Analysis of Reformed Gas by Gas Chromatography
SIGNIFICANCE AND USE
The information about the chemical composition can be used to calculate physical properties of the gas, such as heating (calorific) value and relative density. Combustion characteristics, products of combustion, toxicity, and interchangeability with other fuel gases may also be inferred from the chemical composition.
SCOPE
1.1 This practice covers the determination of the chemical composition of reformed gases and similar gaseous mixtures containing the following components: hydrogen, oxygen, nitrogen, carbon monoxide, carbon dioxide, methane, ethane, and ethylene.
This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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Designation:D1946–90(Reapproved 2006)
Standard Practice for
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Analysis of Reformed Gas by Gas Chromatography
This standard is issued under the fixed designation D1946; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope tics, products of combustion, toxicity, and interchangeability
with other fuel gases may also be inferred from the chemical
1.1 This practice covers the determination of the chemical
composition.
composition of reformed gases and similar gaseous mixtures
containing the following components: hydrogen, oxygen, ni-
5. Apparatus
trogen, carbon monoxide, carbon dioxide, methane, ethane,
5.1 Detector—The detector shall be a thermal conductivity
and ethylene.
type or its equivalent in stability and sensitivity. The thermal
1.2 This standard does not purport to address all of the
conductivity detector must be sufficiently sensitive to produce
safety concerns, if any, associated with its use. It is the
a signal of at least 0.5 mV for 1 mol % methane in a 0.5-mL
responsibility of the user of this standard to establish appro-
sample.
priate safety and health practices and determine the applica-
5.2 Recording Instruments—Either strip chart recorders or
bility of regulatory limitations prior to use.
electronic integrators, or both, are used to display the separated
2. Referenced Documents components. Although a strip chart recorder is not required
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when using electronic integration, it is highly desirable for
2.1 ASTM Standards:
evaluation of instrument performance.
E260 Practice for Packed Column Gas Chromatography
5.2.1 Therecorder,whenused,shallbeastripchartrecorder
3. Summary of Practice with a full-range scale of 5 mV or less (1 mV preferred). The
width of the chart shall be not less than 150 mm. A maximum
3.1 Components in a sample of reformed gas are physically
pen response time of2s(1s preferred) and a minimum chart
separatedbygaschromatographyandcomparedtocorrespond-
speed of 10 mm/min shall be required. Faster speeds up to 100
ing components of a reference standard separated under
mm/min are desirable if the chromatogram is to be interpreted
identical operating conditions, using a reference standard
using manual methods to obtain areas.
mixture of known composition. The composition of the re-
5.2.2 Electronic or Computing Integrators—Proof of sepa-
formed gas is calculated by comparison of either the peak
ration and response equivalent to that for the recorder is
height or area response of each component with the corre-
required for displays other than by chart recorder.
sponding value of that component in the reference standard.
5.3 Attenuator—If manual methods are used to interpret the
4. Significance and Use
chromatogram, an attenuator must be used with the detector
output signal to keep the peak maxima within the range of the
4.1 The information about the chemical composition can be
recorder chart.The attenuator must be accurate to within 0.5 %
used to calculate physical properties of the gas, such as heating
between the attenuator range steps.
(calorific) value and relative density. Combustion characteris-
5.4 Sample Inlet System:
5.4.1 The sample inlet system must be constructed of
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This practice is under the jurisdiction of ASTM Committee D03 on Gaseous
materials that are inert and nonadsorptive with respect to the
Fuels and is the direct responsibility of Subcommittee D03.07 on Analysis of
components in the sample. The preferred material of construc-
Chemical Composition of Gaseous Fuels.
tion is stainless steel. Copper and copper-bearing alloys are
Current edition approved June 1, 2006. Published June 2006. Originally
unacceptable.
approved in 1962. Last previous edition approved in 2000 as D1946 – 90 (2000).
DOI: 10.1520/D1946-90R06.
5.4.2 Provision must be made to introduce into the carrier
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
gas ahead of the analyzing column a gas-phase sample that has
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
beenentrappedineitherafixedvolumelooportubularsection.
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. The injected volume must be reproducible such that successive
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D1946–90 (2006)
runs of the same sample agree within the limits of repeatability sample. The preferred material of construction is stainless
for the concentration range as specified in 11.1.1. s
...
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