ASTM D1946-90(2019)
(Practice)Standard Practice for Analysis of Reformed Gas by Gas Chromatography
Standard Practice for Analysis of Reformed Gas by Gas Chromatography
SIGNIFICANCE AND USE
4.1 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.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.3 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
General Information
Relations
Standards Content (Sample)
This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: D1946 − 90 (Reapproved 2019)
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 4. Significance and Use
1.1 This practice covers the determination of the chemical 4.1 The information about the chemical composition can be
composition of reformed gases and similar gaseous mixtures used to calculate physical properties of the gas, such as heating
containing the following components: hydrogen, oxygen, (calorific) value and relative density. Combustion
nitrogen, carbon monoxide, carbon dioxide, methane, ethane, characteristics, products of combustion, toxicity, and inter-
and ethylene. changeability with other fuel gases may also be inferred from
the chemical composition.
1.2 The values stated in SI units are to be regarded as
standard. No other units of measurement are included in this
5. Apparatus
standard.
5.1 Detector—The detector shall be a thermal conductivity
1.3 This standard does not purport to address all of the
type or its equivalent in stability and sensitivity. The thermal
safety concerns, if any, associated with its use. It is the
conductivity detector must be sufficiently sensitive to produce
responsibility of the user of this standard to establish appro-
a signal of at least 0.5 mV for 1 mol % methane in a 0.5-mL
priate safety, health, and environmental practices and deter-
sample.
mine the applicability of regulatory limitations prior to use.
5.2 Recording Instruments—Either strip chart recorders or
1.4 This international standard was developed in accor-
electronic integrators, or both, are used to display the separated
dance with internationally recognized principles on standard-
components. It is highly desirable to evaluate the performance
ization established in the Decision on Principles for the
of strip chart recorders or electronic integrators.
Development of International Standards, Guides and Recom-
5.2.1 The recorder, when used, shall be a strip chart recorder
mendations issued by the World Trade Organization Technical
with a full-range scale of 5 mV or less (1 mV preferred). The
Barriers to Trade (TBT) Committee.
width of the chart shall be not less than 150 mm. A maximum
2. Referenced Documents pen response time of 2 s (1 s preferred) and a minimum chart
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speed of 10 mm/min shall be required. Faster speeds up to 100
2.1 ASTM Standards:
mm/min are desirable if the chromatogram is to be interpreted
E260 Practice for Packed Column Gas Chromatography
using manual methods to obtain areas.
3. Summary of Practice 5.2.2 Electronic or Computing Integrators—Proof of sepa-
ration and response equivalent to that for the recorder is
3.1 Components in a sample of reformed gas are physically
required for displays other than by chart recorder.
separated by gas chromatography and compared to correspond-
ing components of a reference standard separated under 5.3 Attenuator—If manual methods are used to interpret the
identical operating conditions, using a reference standard chromatogram, an attenuator must be used with the detector
mixture of known composition. The composition of the re- output signal to keep the peak maxima within the range of the
formed gas is calculated by comparison of either the peak recorder chart. The attenuator must be accurate to within 0.5 %
height or area response of each component with the corre- between the attenuator range steps.
sponding value of that component in the reference standard.
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 D03.06.01 on Analysis of
components in the sample. The preferred material of construc-
Major Constituents by Gas Chromatography.
tion is stainless steel. Copper and copper-bearing alloys are
Current edition approved Dec. 1, 2019. Published January 2020. Originally
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unacceptable.
approved in 1962. Last previous edition approved in 2015 as D1946 – 90(2015) .
DOI: 10.1520/D1946-90R19.
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 servi
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