ASTM D7756-13

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 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 Units—The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only.  
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 and health practices and determine the applicability of regulatory limitations prior to use.

General Information

• Status: Historical
• Publication Date: 14-Jun-2013
• 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 −13
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* D2158 Test Method for Residues in Liquefied Petroleum
(LP) Gases
1.1 This test method covers the determination, by gas
D2163 Test Method for Determination of Hydrocarbons in
chromatography, of soluble hydrocarbon materials, sometimes
Liquefied Petroleum (LP) Gases and Propane/Propene
called “oily residue,” which can be present in Liquefied
Mixtures by Gas Chromatography
Petroleum (LP) Gases and which are substantially less volatile
D2421 Practice for Interconversion of Analysis of C and
5
than the LPG product.
Lighter Hydrocarbons to Gas-Volume, Liquid-Volume, or
1.2 This test method quantifies, in the range of 10 to 600
Mass Basis
mg/kg (ppm mass), the residue with a boiling point between
D2598 Practice for Calculation of Certain Physical Proper-
174°C and 522°C (C to C ) in LPG. Higher boiling
10 40
ties of Liquefied Petroleum (LP) Gases from Composi-
materials, or materials that adhere permanently to the chro-
tional Analysis
matographic column, will not be detected.
D3700 Practice for Obtaining LPG Samples Using a Float-
1.3 Appendix X3 and Appendix X4 describe additional
ing Piston Cylinder
applications which could be performed based on the hardware D6299 Practice for Applying Statistical Quality Assurance
and procedures described in this test method. Appendix X3
and Control Charting Techniques to Evaluate Analytical
describes a test procedure for expanding the analysis range to
Measurement System Performance
benzene, and Appendix X4 describes a test procedure for the
D6300 Practice for Determination of Precision and Bias
analysis of diisopropanolamine in LPG.
Data for Use in Test Methods for Petroleum Products and
Lubricants
1.4 Units—The values stated in SI units are to be regarded
D6667 Test Method for Determination of Total Volatile
as standard. The values given in parentheses are for informa-
Sulfur in Gaseous Hydrocarbons and Liquefied Petroleum
tion only.
Gases by Ultraviolet Fluorescence
1.5 This standard does not purport to address all of the
E355 Practice for Gas ChromatographyTerms and Relation-
safety concerns, if any, associated with its use. It is the
ships
responsibility of the user of this standard to establish appro-
E594 Practice for Testing Flame Ionization Detectors Used
priate safety and health practices and determine the applica-
in Gas or Supercritical Fluid Chromatography
bility of regulatory limitations prior to use.
3. Terminology
2. Referenced Documents
2
3.1 Definitions of Terms Concerning Chromatography—
2.1 ASTM Standards:
This test method makes reference to many common gas
D1265 Practice for Sampling Liquefied Petroleum (LP)
chromatographicprocedures,terms,andrelationships.Detailed
Gases, Manual Method
definitions of these can be found in Practices E355 and E594.
D1835 Specification for Liquefied Petroleum (LP) Gases
3.2 Definitions of Terms Concerning Liquefied Petroleum
Gases—This test method makes reference to the definitions of
1
This test method is under the jurisdiction of ASTM Committee D02 on
liquefied petroleum gases as described in Specification D1835.
Petroleum Products, Liquid Fuels, and Lubricants and is the direct responsibility of
Subcommittee D02.H0 on Liquefied Petroleum Gas.
3.3 Definitions of Terms Specific to This Standard:
Current edition approved June 15, 2013. Published July 2013. Originally
3.3.1 high pressure liquefied gas injector, n—Sample intro-
approved in 2011. Last previous edition approved in 2012 as D7756–12.
DOI:10.1520/D7756-13.
duction device which injects liquefied gas samples under
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
pressure and at room temperature directly onto the chromato-
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
graphic column thereby maintaining the sample in liquid phase
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. during the injection process.
*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 ----------------------
D7756−13
3.3.2 pressure station, n—Device that supplies high pres- 5.2 This test method is quicker and much more sensitive
sure nitrogen to a suitable sample cylinder and therefore
...

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 − 12 D7756 − 13
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 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 column,
10 40
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.
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 and health practices and determine the applicability of regulatory
limitations prior to use.
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 Analysis of Liquefied Petroleum (LP) Gases and Propene Concentrates 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
3. Terminology
3.1 Definitions of Terms Concerning Chromatography—This test method makes reference to many common gas chromato-
graphic procedures, terms, and relationships. 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 and Lubricants and is the direct responsibility of Subcommittee D02.H0 on
Liquefied Petroleum Gas.
Current edition approved Nov. 1, 2012June 15, 2013. Published April 2013July 2013. Originally approved in 2011. Last previous edition approved in 20112012 as
D7756–11. DOI:10.1520/D7756-12.–12. DOI:10.1520/D7756-13.
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 − 13
3.2 Definitions of Terms Concerning Liquefied Petroleum Gases—This test method makes reference to the definitions of
liquefied petroleum gases as described in Specification D1835.
3.3 Definitions of Terms Specific to This Standard:
3.3.1 high pressure liquefied gas injector, n—Sample introduction device which injects liquefied gas samples under pressure and
at room tempera
...