ASTM D6897-16
(Test Method)Standard Test Method for Vapor Pressure of Liquefied Petroleum Gases (LPG) (Expansion Method)
Standard Test Method for Vapor Pressure of Liquefied Petroleum Gases (LPG) (Expansion Method)
SIGNIFICANCE AND USE
5.1 Information on the vapor pressures of liquefied petroleum gas is pertinent to selection of properly designed storage vessels, shipping containers, and customer utilization equipment to ensure safe handling of these products.
5.2 Determination of the vapor pressure of liquefied petroleum gas is important for safety reasons to ensure that the maximum operating design pressures of storage, handling, and fuel systems will not be exceeded under normal operating temperature conditions.
5.3 For liquefied petroleum gases, vapor pressure can be considered a semi-quantitative measure of the amount of the most volatile material present in the product.
5.4 This test method uses a small sample volume and excludes any manual handling of a measuring chamber under high pressure.
SCOPE
1.1 This test method covers the use of automatic vapor pressure instruments to determine the vapor pressure of liquefied petroleum gas products at a temperature of 37.8 °C, vapor to liquid ratio of 0.5:1, and pressures from 200 kPa to 1550 kPa on a sample volume of 3.33 mL.
1.2 This test method is applicable to the determination of vapor pressures of liquefied petroleum gas products at temperatures from 37.8 °C to 70 °C, vapor to liquid ratios of 0.1:1 to 4:1, and pressures up to 3500 kPa; however, the precision of the test method (see Section 15) has only been determined for a vapor to liquid ratio of 0.5:1, at a temperature of 37.8 °C, and a pressure range from 300 kPa to 1500 kPa.
Note 1: This test method is not intended to determine the true vapor pressure of LPG samples, but rather determine and report the vapor pressure of LPG at the 37.8 °C temperature and 0.5:1 vapor to liquid ratio as the Test Method D1267 method.
Note 2: This test method is not a true vapor pressure method and will not measure the full contribution from any dissolved gases such as nitrogen or helium if they are present. The contribution of light gases to the measured vapor pressure is highly dependent on the test temperature, type of gas, and V/L ratio of the test.
1.3 The values stated in SI units are to be regarded as standard.
1.3.1 Exception—Non-SI units are included in parentheses for information only.
1.4 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. For specific warning statements, see Appendix X2.
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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: D6897 −16
Standard Test Method for
Vapor Pressure of Liquefied Petroleum Gases (LPG)
1
(Expansion Method)
This standard is issued under the fixed designation D6897; 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* 2. Referenced Documents
2
2.1 ASTM Standards:
1.1 This test method covers the use of automatic vapor
D1265 Practice for Sampling Liquefied Petroleum (LP)
pressure instruments to determine the vapor pressure of lique-
Gases, Manual Method
fied petroleum gas products at a temperature of 37.8 °C, vapor
D1267 Test Method for Gage Vapor Pressure of Liquefied
toliquidratioof0.5:1,andpressuresfrom200 kPato1550 kPa
Petroleum (LP) Gases (LP-Gas Method)
on a sample volume of 3.33 mL.
D2892 Test Method for Distillation of Crude Petroleum
1.2 This test method is applicable to the determination of
(15-Theoretical Plate Column)
vapor pressures of liquefied petroleum gas products at tem-
D3700 Practice for Obtaining LPG Samples Using a Float-
peratures from 37.8 °C to 70 °C, vapor to liquid ratios of 0.1:1
ing Piston Cylinder
to 4:1, and pressures up to 3500 kPa; however, the precision of
D5191 Test Method for Vapor Pressure of Petroleum Prod-
the test method (see Section 15) has only been determined for
ucts (Mini Method)
avaportoliquidratioof0.5:1,atatemperatureof37.8 °C,and
D6299 Practice for Applying Statistical Quality Assurance
a pressure range from 300 kPa to 1500 kPa.
and Control Charting Techniques to Evaluate Analytical
NOTE 1—This test method is not intended to determine the true vapor
Measurement System Performance
pressure of LPG samples, but rather determine and report the vapor
3
2.2 Energy Institute Standards:
pressure of LPG at the 37.8 °C temperature and 0.5:1 vapor to liquid ratio
as the Test Method D1267 method. IP 181 Sampling Petroleum Gases
NOTE 2—This test method is not a true vapor pressure method and will
3. Terminology
not measure the full contribution from any dissolved gases such as
nitrogen or helium if they are present. The contribution of light gases to
3.1 Definitions:
the measured vapor pressure is highly dependent on the test temperature,
3.1.1 liquefied petroleum gases (LPG), n—narrow boiling
type of gas, and V/L ratio of the test.
range hydrocarbon mixtures, consisting mainly of propane or
1.3 The values stated in SI units are to be regarded as
propylene,orboth(Warning—Extremelyflammable.Harmful
standard.
if inhaled), butanes and butylenes, or both; in which the
1.3.1 Exception—Non-SI units are included in parentheses
concentration of hydrocarbon compounds with boiling point
for information only.
greater than 0 °C is less than 5 % by liquid volume, and whose
1.4 This standard does not purport to address all of the vaporpressureat37.8 °C(100 °F)isnotgreaterthan1550 kPa.
safety concerns, if any, associated with its use. It is the
3.1.2 platinum resistance thermometer, n—temperature
responsibility of the user of this standard to establish appro-
measuring device with platinum wire, whose electrical resis-
priate safety and health practices and determine the applica-
tance changes in relation to temperature.
bility of regulatory limitations prior to use. For specific
3.1.3 vapor-liquid ratio (V/L), n—of a liquid,theratioofthe
warning statements, see Appendix X2.
vaporvolumetotheliquidvolumeofspecimen,inequilibrium,
under specified conditions.
1 2
This test method is under the jurisdiction of ASTM Committee D02 on For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Petroleum Products, Liquid Fuels, and Lubricants and is the direct responsibility of contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Subcommittee D02.08 on Volatility. Standards volume information, refer to the standard’s Document Summary page on
Current edition approved July 15, 2016. Published August 2016. Originally the ASTM website.
3
approved in 2003. Last previous edition approved in 2009 as D6897 – 09. DOI: Available from Energy Institute, 61 New Cavendish St., London, WIG 7AR,
10.1520/D6897-16. U.K., http://www.energyinst.org.uk.
*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 ----------------------
D6897 − 16
3.2 Definitions of Terms Specific to This Standard: to control the chamber temperature within the range of 5 °C to
3.
...
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: D6897 − 09 D6897 − 16
Standard Test Method for
Vapor Pressure of Liquefied Petroleum Gases (LPG)
1
(Expansion Method)
This standard is issued under the fixed designation D6897; 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 use of automatic vapor pressure instruments to determine the vapor pressure of liquefied
petroleum gas products at a temperature of 37.8°C,37.8 °C, vapor to liquid ratio of 0.5:1, and pressures from 200200 kPa to 1550
kPa 1550 kPa on a sample volume of 3.33 mL.3.33 mL.
1.2 This test method is applicable to the determination of vapor pressures of liquefied petroleum gas products at temperatures
from 37.837.8 °C to 70°C,70 °C, vapor to liquid ratios of 0.1:1 to 4:1, and pressures up to 3500 kPa; 3500 kPa; however, the
precision of the test method (see Section 15) has only been determined for a vapor to liquid ratio of 0.5:1, at a temperature of
37.8°C,37.8 °C, and a pressure range from 300300 kPa to 1500 kPa.1500 kPa.
NOTE 1—This test method is not intended to determine the true vapor pressure of LPG samples, but rather determine and report the vapor pressure
of LPG at the 37.8°C37.8 °C temperature and 0.5:1 vapor to liquid ratio as the Test Method D1267 method.
NOTE 2—This test method is not a true vapor pressure method and will not measure the full contribution from any dissolved gases such as nitrogen
or helium if they are present. The contribution of light gases to the measured vapor pressure is highly dependent on the test temperature, type of gas,
and V/L ratio of the test.
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.3.1 Exception—Non-SI units are included in parentheses for information only.
1.4 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. For specific warning statements, see Appendix X2.
2. Referenced Documents
2
2.1 ASTM Standards:
D1265 Practice for Sampling Liquefied Petroleum (LP) Gases, Manual Method
D1267 Test Method for Gage Vapor Pressure of Liquefied Petroleum (LP) Gases (LP-Gas Method)
D2892 Test Method for Distillation of Crude Petroleum (15-Theoretical Plate Column)
D3700 Practice for Obtaining LPG Samples Using a Floating Piston Cylinder
D5191 Test Method for Vapor Pressure of Petroleum Products (Mini Method)
D6299 Practice for Applying Statistical Quality Assurance and Control Charting Techniques to Evaluate Analytical Measure-
ment System Performance
3
2.2 Energy Institute Standards:
IP 181 Sampling Petroleum Gases
3. Terminology
3.1 Definitions:
3.1.1 liquefied petroleum gases (LPG), n—narrow boiling range hydrocarbon mixtures, consisting mainly of propane or
propylene, or both (Warning—WarningExtremely—Extremely flammable. Harmful if inhaled), butanes and butylenes, or both; in
1
This test method is under the jurisdiction of ASTM Committee D02 on Petroleum Products Products, Liquid Fuels, and Lubricants and is the direct responsibility of
Subcommittee D02.08 on Volatility.
Current edition approved April 15, 2009July 15, 2016. Published May 2009 August 2016. Originally approved in 2003. Last previous edition approved in 20032009 as
D6897–03a. DOI: 10.1520/D6897-09. – 09. DOI: 10.1520/D6897-16.
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.
3
Available from Energy Institute, 61 New Cavendish St., London, WIG 7AR, U.K., http://www.energyinst.org.uk.
*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 ----------------------
D6897 − 16
which the concentration of hydrocarbon compounds with boiling point greater than 0°C0 °C is less than 5 % by liquid volume,
and whose vapor pressure at 37.8°C (100°F)37.8 °C (100 °F) is not greater than 1550 kPa.1550 kPa.
3.1.2 platinu
...
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