ASTM D7975-22

Standard Test Method for Determination of Vapor Pressure of Crude Oil: <brk/>VPCR<inf >x</inf>-F(Tm°C) (Manual Expansion Field Method)

SIGNIFICANCE AND USE
5.1 Vapor pressure of crude oil at various vapor/liquid ratios is an important physical property for transport, storage, and refinery operations.  
5.2 Vapor pressure of crude oil is important to crude oil producers, regulators, transporters and refiners for general handling, transportation, and initial refinery treatment.  
5.3 The direct sample collection and subsequent, in place, vapor pressure measurement without the need for further sample handling eliminates the potential loss of light hydrocarbon material from the sample. The combination of sampling and testing may produce higher results than Test Method D323.  
5.4 Chilling and air saturation of the sample prior to the vapor pressure measurement (as required in Test Method D323) is not required in this test method.
SCOPE
1.1 This test method covers the use of manual vapor pressure instruments to determine the vapor pressure of crude oils exerted in a vacuum. This test method is suitable for testing samples that exert a vapor pressure between 25 kPa and 180 kPa at 37.8 °C at vapor/liquid ratios from 4:1 to 0.25:1 (X = 4 to 0.25, see 3.2.4).
Note 1: This test method is suitable for the determination of the vapor pressure of crude oils at temperatures from 0 °C to 60 °C and pressures up to 500 kPa, but the precision and bias statements (see Section 15) may not be applicable.  
1.2 This test method is meant primarily for use under field conditions for immediate evaluation of vapor pressure for storage, transport, or operational uses.  
1.3 This test method is not intended for use in custody transfer applications. Test Method D6377 shall be used for custody transfer applications.  
1.4 This test method provides a reasonable confirmation for the presence of light ends in the source material given that the partial pressure of low boiling components contribute significantly to total vapor pressure.  
1.5 This test method allows both sample collection and subsequent vapor pressure measurement of crude oil samples directly from the sample source. The collected sample may also be transferred to an automated vapor pressure instrument such as used for Test Method D6377. The field test apparatus is suitable for transportation provided suitable over-pack is used to meet the regulations for the transportation of dangerous goods in the transportation jurisdiction(s).  
1.6 This test method allows the determination of vapor pressure for crude oil samples having pour points below 0 °C and flow at the sampling conditions to allow inlet to the apparatus.  
1.7 The values stated in SI units are to be regarded as standard.  
1.7.1 Exception—Other units of measurement are included in this standard for ease of use in multiple jurisdictions.  
1.8 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.  
1.9 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: Published
• Publication Date: 30-Nov-2022
• ICS: 75.080 - Petroleum products in general
• Technical Committee: D02 - Petroleum Products, Liquid Fuels, and Lubricants
• Drafting Committee: D02.08 - Volatility

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: D7975 − 22
Standard Test Method for
Determination of Vapor Pressure of Crude Oil:
1
VPCR -F(Tm°C) (Manual Expansion Field Method)
x
This standard is issued under the fixed designation D7975; 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* 1.7.1 Exception—Other units of measurement are included
in this standard for ease of use in multiple jurisdictions.
1.1 This test method covers the use of manual vapor
pressure instruments to determine the vapor pressure of crude
1.8 This standard does not purport to address all of the
oilsexertedinavacuum.Thistestmethodissuitablefortesting
safety concerns, if any, associated with its use. It is the
samples that exert a vapor pressure between 25 kPa and
responsibility of the user of this standard to establish appro-
180 kPa at 37.8 °C at vapor/liquid ratios from 4:1 to 0.25:1 (X
priate safety, health, and environmental practices and deter-
= 4 to 0.25, see 3.2.4).
mine the applicability of regulatory limitations prior to use.
NOTE 1—This test method is suitable for the determination of the vapor
1.9 This international standard was developed in accor-
pressure of crude oils at temperatures from 0 °C to 60 °C and pressures up
dance with internationally recognized principles on standard-
to 500 kPa, but the precision and bias statements (see Section 15) may not
ization established in the Decision on Principles for the
be applicable.
Development of International Standards, Guides and Recom-
1.2 This test method is meant primarily for use under field
mendations issued by the World Trade Organization Technical
conditions for immediate evaluation of vapor pressure for
Barriers to Trade (TBT) Committee.
storage, transport, or operational uses.
1.3 This test method is not intended for use in custody
2. Referenced Documents
transfer applications. Test Method D6377 shall be used for
2
2.1 ASTM Standards:
custody transfer applications.
D323 TestMethodforVaporPressureofPetroleumProducts
1.4 This test method provides a reasonable confirmation for
(Reid Method)
the presence of light ends in the source material given that the
D1193 Specification for Reagent Water
partial pressure of low boiling components contribute signifi-
D4175 Terminology Relating to Petroleum Products, Liquid
cantly to total vapor pressure.
Fuels, and Lubricants
1.5 This test method allows both sample collection and
D5191 Test Method for Vapor Pressure of Petroleum Prod-
subsequent vapor pressure measurement of crude oil samples
ucts and Liquid Fuels (Mini Method)
directly from the sample source. The collected sample may
D5853 Test Method for Pour Point of Crude Oils
also be transferred to an automated vapor pressure instrument
D6377 Test Method for Determination of Vapor Pressure of
such as used for Test Method D6377. The field test apparatus
Crude Oil: VPCR (Expansion Method)
x
is suitable for transportation provided suitable over-pack is
usedtomeettheregulationsforthetransportationofdangerous
3. Terminology
goods in the transportation jurisdiction(s).
3.1 Definitions:
1.6 This test method allows the determination of vapor
3.1.1 For definitions of terms used in this test method, refer
pressure for crude oil samples having pour points below 0 °C
to Terminology D4175.
and flow at the sampling conditions to allow inlet to the
3.1.2 vapor/liquid ratio (V/L), n—the ratio of the vapor
apparatus.
volumetotheliquidvolumeofspecimen,inequilibrium,under
1.7 The values stated in SI units are to be regarded as
specified conditions.
standard.
3.2 Definitions of Terms Specific to This Standard:
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 D02.08 on Volatility. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Dec. 1, 2022. Published January 2023. Originally contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
approved in 2014. Last previous edition approved in 2014 as D7975 – 14. DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/D7975-22. 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 ----------------------
D7975 − 22
3.2.1 dead crude oi
...

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: D7975 − 14 D7975 − 22
Standard Test Method for
Determination of Vapor Pressure of Crude Oil:
1
VPCR -F(Tm°C) (Manual Expansion Field Method)
x
This standard is issued under the fixed designation D7975; 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 Scope*
1.1 This test method covers the use of manual vapor pressure instruments to determine the vapor pressure of crude oils exerted
in a vacuum. This test method is suitable for testing samples that exert a vapor pressure between 25 kPa and 180 kPa at 37.8 °C
at vapor/liquid ratios from 4:1 to 0.25:1 (X = 4 to 0.25, see 3.2.4).
NOTE 1—This test method is suitable for the determination of the vapor pressure of crude oils at temperatures from 0 °C to 60 °C and pressures up to
500 kPa, but the precision and bias statements (see Section 15) may not be applicable.
1.2 This test method is meant primarily for use under field conditions for immediate evaluation of vapor pressure for storage,
transport, or operational uses.
1.3 This test method is not intended for use in custody transfer applications. Test Method D6377 shall be used for custody transfer
applications.
1.4 This test method provides a reasonable confirmation for the presence of light ends in the source material given that the partial
pressure of low boiling components contribute significantly to total vapor pressure.
1.5 This test method allows both sample collection and subsequent vapor pressure measurement of crude oil samples directly from
the sample source. The collected sample may also be transferred to an automated vapor pressure instrument such as used for Test
Method D6377. The field test apparatus is suitable for transportation provided suitable over-pack is used to meet the regulations
for the transportation of dangerous goods in the transportation jurisdiction(s).
1.6 This test method allows the determination of vapor pressure for crude oil samples having pour points below 0 °C and flow
at the sampling conditions to allow inlet to the apparatus.
1.7 The values stated in SI units are to be regarded as standard.
1.7.1 Exception—Other units of measurement are included in this standard for ease of use in multiple jurisdictions.
1.8 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
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
D02.08 on Volatility.
Current edition approved Dec. 1, 2014Dec. 1, 2022. Published February 2015January 2023. Originally approved in 2014. Last previous edition approved in 2014 as
D7975 – 14. DOI: 10.1520/D7975-14.10.1520/D7975-22.
*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 ----------------------
D7975 − 22
1.9 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:
D323 Test Method for Vapor Pressure of Petroleum Products (Reid Method)
D1193 Specification for Reagent Water
D4175 Terminology Relating to Petroleum Products, Liquid Fuels, and Lubricants
D5191 Test Method for Vapor Pressure of Petroleum Products and Liquid Fuels (Mini Method)
D5853 Test Method for Pour Point of Crude Oils
D6377 Test Method for Determination of Vapor Pressure of Crude Oil: VPCR (Expansion Method)
x
3. Terminology
3.1 Definitions:
3.1.1 For definitions of terms used in this test method, refer to Terminology D4175.
3.1.2 vapor/liquid ratio (V/L), n—the ratio of the vapor volume to the liquid volume of specimen, in equilibrium, under specified
conditions.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 dead crude oil, n—a term usually employed f
...