ASTM D7756-19
(Test Method)Standard Test Method for Residues in Liquefied Petroleum (LP) Gases by Gas Chromatography with Liquid, On-Column Injection
Standard Test Method for Residues in Liquefied Petroleum (LP) Gases by Gas Chromatography with Liquid, On-Column Injection
SIGNIFICANCE AND USE
5.1 Control over the residue content as specified in Specification D1835 is of considerable importance in end-use applications of LPG. Oily residue in LPG is contamination which can occur during production, transportation, or storage.
5.2 This test method is quicker and much more sensitive than manual methods, such as Test Method D2158, which is based on evaporation of large sample volumes followed by visual or gravimetric estimation of residue content.
5.3 This test method provides enhanced sensitivity in measurements of heavier (oily) residues, with a quantification limit of 10 mg/kg total residue.
5.4 This test method gives both quantitative results and information about contaminant composition such as boiling point range and fingerprint, which can be very useful in tracing the source of a particular contaminant.
SCOPE
1.1 This test method covers the determination, by gas chromatography, of soluble hydrocarbon materials, sometimes called “oily residue,” which can be present in liquefied petroleum (LP) gases and which are substantially less volatile than the LPG product.
1.2 This test method quantifies, in the range of 10 mg/kg to 600 mg/kg (ppm mass), the residue with a boiling point between 174 °C and 522 °C (C10 to C40) in LPG. Higher boiling materials, or materials that adhere permanently to the chromatographic column, will not be detected.
1.3 Appendix X3, Appendix X4, and Appendix X6 describe additional applications which could be performed based on the hardware and procedures described in this test method. Appendix X3 describes a test procedure for expanding the analysis range to benzene, Appendix X4 describes a test procedure for the analysis of diisopropanolamine, and Appendix X6 describes a test procedure for the analysis of heavy residues or contaminants from C40 to about C60 in LPG.
1.4 The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for information only and are not considered standard.
1.5 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.
1.6 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.
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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: D7756 −19
Standard Test Method for
Residues in Liquefied Petroleum (LP) Gases by Gas
1
Chromatography with Liquid, On-Column Injection
This standard is issued under the fixed designation D7756; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope* 2. Referenced Documents
2
2.1 ASTM Standards:
1.1 This test method covers the determination, by gas
D1265Practice for Sampling Liquefied Petroleum (LP)
chromatography, of soluble hydrocarbon materials, sometimes
Gases, Manual Method
called “oily residue,” which can be present in liquefied
D1835Specification for Liquefied Petroleum (LP) Gases
petroleum (LP) gases and which are substantially less volatile
D2158Test Method for Residues in Liquefied Petroleum
than the LPG product.
(LP) Gases
1.2 This test method quantifies, in the range of 10mg⁄kg to
D2163Test Method for Determination of Hydrocarbons in
600mg⁄kg (ppm mass), the residue with a boiling point
Liquefied Petroleum (LP) Gases and Propane/Propene
between 174°C and 522°C (C to C ) in LPG. Higher
10 40
Mixtures by Gas Chromatography
boiling materials, or materials that adhere permanently to the
D2421Practice for Interconversion of Analysis of C and
5
chromatographic column, will not be detected.
Lighter Hydrocarbons to Gas-Volume, Liquid-Volume, or
Mass Basis
1.3 AppendixX3,AppendixX4,andAppendixX6describe
D2598Practice for Calculation of Certain Physical Proper-
additional applications which could be performed based on the
ties of Liquefied Petroleum (LP) Gases from Composi-
hardwareandproceduresdescribedinthistestmethod.Appen-
tional Analysis
dix X3 describes a test procedure for expanding the analysis
D3700Practice for Obtaining LPG Samples Using a Float-
range to benzene, Appendix X4 describes a test procedure for
ing Piston Cylinder
the analysis of diisopropanolamine, and Appendix X6 de-
D6299Practice for Applying Statistical Quality Assurance
scribes a test procedure for the analysis of heavy residues or
and Control Charting Techniques to Evaluate Analytical
contaminants from C to about C in LPG.
40 60
Measurement System Performance
1.4 The values stated in SI units are to be regarded as
D6300Practice for Determination of Precision and Bias
standard. The values given in parentheses after SI units are
Data for Use in Test Methods for Petroleum Products and
providedforinformationonlyandarenotconsideredstandard.
Lubricants
D6667Test Method for Determination of Total Volatile
1.5 This standard does not purport to address all of the
Sulfur in Gaseous Hydrocarbons and Liquefied Petroleum
safety concerns, if any, associated with its use. It is the
Gases by Ultraviolet Fluorescence
responsibility of the user of this standard to establish appro-
E355PracticeforGasChromatographyTermsandRelation-
priate safety, health, and environmental practices and deter-
ships
mine the applicability of regulatory limitations prior to use.
E594Practice for Testing Flame Ionization Detectors Used
1.6 This international standard was developed in accor-
in Gas or Supercritical Fluid Chromatography
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the
3. Terminology
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical 3.1 Definitions of Terms Concerning Chromatography—
Barriers to Trade (TBT) Committee. This test method makes reference to many common gas
chromatographicprocedures,terms,andrelationships.Detailed
definitions of these can be found in Practices E355 and E594.
1
This test method is under the jurisdiction of ASTM Committee D02 on
Petroleum Products, Liquid Fuels, and Lubricants and is the direct responsibility of
2
Subcommittee D02.H0 on Liquefied Petroleum Gas. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved May 1, 2019. Published June 2019. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 2011. Last previous edition approved in 2018 as D7756–18. Standards volume information, refer to the standard’s Document Summary page on
DOI:10.1520 ⁄D7756-19. the ASTM website.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
D7756 − 19
3.2 Definitions of Ter
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: D7756 − 18 D7756 − 19
Standard Test Method for
Residues in Liquefied Petroleum (LP) Gases by Gas
1
Chromatography with Liquid, On-Column Injection
This standard is issued under the fixed designation D7756; 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*
1.1 This test method covers the determination, by gas chromatography, of soluble hydrocarbon materials, sometimes called
“oily residue,” which can be present in liquefied petroleum (LP) gases and which are substantially less volatile than the LPG
product.
1.2 This test method quantifies, in the range of 10 mg ⁄kg to 600 mg ⁄kg (ppm mass), the residue with a boiling point between
174 °C and 522 °C (C to C ) in LPG. Higher boiling materials, or materials that adhere permanently to the chromatographic
10 40
column, will not be detected.
1.3 Appendix X3, Appendix X4and, Appendix X4and Appendix X6 describe additional applications which could be performed
based on the hardware and procedures described in this test method. Appendix X3 describes a test procedure for expanding the
analysis range to benzene, and Appendix X4 describes a test procedure for the analysis of diisopropanolamine diisopropanolamine,
and Appendix X6 describes a test procedure for the analysis of heavy residues or contaminants from C to about C in LPG.
40 60
1.4 The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for
information only and are not considered standard.
1.5 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.
1.6 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.
2. Referenced Documents
2
2.1 ASTM Standards:
D1265 Practice for Sampling Liquefied Petroleum (LP) Gases, Manual Method
D1835 Specification for Liquefied Petroleum (LP) Gases
D2158 Test Method for Residues in Liquefied Petroleum (LP) Gases
D2163 Test Method for Determination of Hydrocarbons in Liquefied Petroleum (LP) Gases and Propane/Propene Mixtures by
Gas Chromatography
D2421 Practice for Interconversion of Analysis of C and Lighter Hydrocarbons to Gas-Volume, Liquid-Volume, or Mass Basis
5
D2598 Practice for Calculation of Certain Physical Properties of Liquefied Petroleum (LP) Gases from Compositional Analysis
D3700 Practice for Obtaining LPG Samples Using a Floating Piston Cylinder
D6299 Practice for Applying Statistical Quality Assurance and Control Charting Techniques to Evaluate Analytical Measure-
ment System Performance
D6300 Practice for Determination of Precision and Bias Data for Use in Test Methods for Petroleum Products and Lubricants
D6667 Test Method for Determination of Total Volatile Sulfur in Gaseous Hydrocarbons and Liquefied Petroleum Gases by
Ultraviolet Fluorescence
E355 Practice for Gas Chromatography Terms and Relationships
1
This test method is under the jurisdiction of ASTM Committee D02 on Petroleum Products, Liquid Fuels, and Lubricants and is the direct responsibility of Subcommittee
D02.H0 on Liquefied Petroleum Gas.
Current edition approved Oct. 1, 2018May 1, 2019. Published November 2018June 2019. Originally approved in 2011. Last previous edition approved in 20132018 as
D7756 – 13.D7756 – 18. DOI:10.1520/D7756-18.DOI:10.1520 ⁄D7756-19.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
D7756 − 19
E594 Practice for Testing Flame Ionization Detectors Used in Gas or Supercritical Fluid Chromatog
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