ASTM D7756-18

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 and Appendix X4 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 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.

General Information

• Status: Historical
• Publication Date: 30-Sep-2018
• ICS: 75.160.30 - Gaseous fuels
• Technical Committee: D02 - Petroleum Products, Liquid Fuels, and Lubricants
• Drafting Committee: D02.H0 - Liquefied Petroleum Gas

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: D7756 −18
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
1.1 This test method covers the determination, by gas 2.1 ASTM Standards:
chromatography, of soluble hydrocarbon materials, sometimes D1265Practice for Sampling Liquefied Petroleum (LP)
called “oily residue,” which can be present in liquefied Gases, Manual Method
petroleum (LP) gases and which are substantially less volatile D1835Specification for Liquefied Petroleum (LP) Gases
than the LPG product. D2158Test Method for Residues in Liquefied Petroleum
(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
1.3 Appendix X3 and Appendix X4 describe additional
Mass Basis
applications which could be performed based on the hardware
D2598Practice for Calculation of Certain Physical Proper-
and procedures described in this test method. Appendix X3
ties of Liquefied Petroleum (LP) Gases from Composi-
describes a test procedure for expanding the analysis range to
tional Analysis
benzene, and Appendix X4 describes a test procedure for the
D3700Practice for Obtaining LPG Samples Using a Float-
analysis of diisopropanolamine in LPG.
ing Piston Cylinder
D6299Practice for Applying Statistical Quality Assurance
1.4 The values stated in SI units are to be regarded as
standard. The values given in parentheses after SI units are and Control Charting Techniques to Evaluate Analytical
Measurement System Performance
providedforinformationonlyandarenotconsideredstandard.
D6300Practice for Determination of Precision and Bias
1.5 This standard does not purport to address all of the
Data for Use in Test Methods for Petroleum Products and
safety concerns, if any, associated with its use. It is the
Lubricants
responsibility of the user of this standard to establish appro-
D6667Test Method for Determination of Total Volatile
priate safety, health, and environmental practices and deter-
Sulfur in Gaseous Hydrocarbons and Liquefied Petroleum
mine the applicability of regulatory limitations prior to use.
Gases by Ultraviolet Fluorescence
1.6 This international standard was developed in accor-
E355PracticeforGasChromatographyTermsandRelation-
dance with internationally recognized principles on standard-
ships
ization established in the Decision on Principles for the
E594Practice for Testing Flame Ionization Detectors Used
Development of International Standards, Guides and Recom-
in Gas or Supercritical Fluid Chromatography
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
3. Terminology
3.1 Definitions of Terms Concerning Chromatography—
This test method makes reference to many common gas
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 Oct. 1, 2018. Published November 2018. Originally contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
approved in 2011. Last previous edition approved in 2013 as D7756–13. Standards volume information, refer to the standard’s Document Summary page on
DOI:10.1520/D7756-18. 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 − 18
chromatographicprocedures,terms,andrelationships.Detailed pointrangeandfingerprint,whichcanbeveryusefulintracing
definitions of these can be found in Practices E355 and E594. the source of a particular contaminant.
3.2 Definitions of Terms Concerning Liquefied Petroleum
6. Apparatus
Gases—This test method makes reference to the definitions of
liquefied petroleum gases as described in Specification D1835. 6.1 Gas Ch
...

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 − 13 D7756 − 18
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 Petroleumliquefied petroleum (LP) Gasesgases and which are substantially less
volatile than the LPG product.
1.2 This test method quantifies, in the range of 1010 mg ⁄kg to 600600 mg mg/kg ⁄kg (ppm mass), the residue with a boiling
point between 174°C174 °C and 522°C522 °C (C to C ) in LPG. Higher boiling materials, or materials that adhere permanently
10 40
to the chromatographic column, will not be detected.
1.3 Appendix X3 and Appendix X4 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 in LPG.
1.4 Units—The values stated in SI units are to be regarded as standard. The values given in parentheses are for information
only.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 safety, health, and healthenvironmental 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
E594 Practice for Testing Flame Ionization Detectors Used in Gas or Supercritical Fluid Chromatography
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 June 15, 2013Oct. 1, 2018. Published July 2013November 2018. Originally approved in 2011. Last previous edition approved in 20122013 as
D7756D7756 – 13.–12. DOI:10.1520/D7756-13. DOI:10.1520/D7756-18.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. 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 − 18
3. Terminology
3.1 Definitions of Terms Concerning Chromatography—This te
...