ASTM D7261-22
(Test Method)Standard Test Method for Determining Water Separation Characteristics of Diesel Fuels by Portable Separometer
Standard Test Method for Determining Water Separation Characteristics of Diesel Fuels by Portable Separometer
SIGNIFICANCE AND USE
5.1 This test method provides a measure of the presence of surfactants in diesel fuels, and can be performed in the field or in a laboratory. Like Test Method D3948 used for jet fuel, this test method can detect traces of some refinery treating chemicals left in fuel. It can also detect surface active substances added to or picked up by the fuel during handling from point of production to point of use.
5.2 Certain additives, which can act as weak surfactants, give a slightly reduced DSEP rating. Other substances which are strong surfactants give much lower DSEP ratings.
5.3 This test method recommends use of the D cell coalescer when testing ULSD that contains less than 1 % biodiesel content. The DB cell coalescer should be used when testing B1-B20 blends. Weak surfactants, with slightly reduced DSEP ratings, do not significantly affect the ability of filter separators to separate free water from the fuel. Strong surfactants give a much lower DSEP rating and adversely affect the ability of filter separators to separate free water from the fuel.
5.4 Results from this test method do not have a known relationship to the rate of water settling in tanks.
5.5 The Micro-Separometer instrument has a measurement range from 50 to 100. Values obtained outside of those limits are undefined and invalid.
Note 2: In the event a value greater than 100 is obtained, there is a good probability that light transmittance was reduced by material contained in the fuel used to set the 100 reference level. The material was subsequently removed during the coalescing portion of the test, thus, the processed fuel had a higher light transmittance than the fuel sample used to obtain the 100 reference level resulting in the final rating measuring in excess of 100.
SCOPE
1.1 This test method covers a rapid portable means for field and laboratory use to rate the ability of diesel fuels (both neat and those containing additives) to release entrained or emulsified water when passed through fiberglass coalescing material.
1.2 This test method is applicable to diesel fuels such as Specification D975 Grade No. 1-D and Grade No. 2-D of all sulfur levels, Specification D7467 biodiesel blends B6-B20, and MIL-DTL-16884, naval distillate fuel (NATO F-76).
Note 1: This test method is similar to Test Method D3948 which is applicable to aviation turbine fuels.
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.4 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.5 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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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: D7261 − 22
Standard Test Method for
Determining Water Separation Characteristics of Diesel
1
Fuels by Portable Separometer
This standard is issued under the fixed designation D7261; 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* D4057 Practice for Manual Sampling of Petroleum and
Petroleum Products
1.1 This test method covers a rapid portable means for field
D4175 Terminology Relating to Petroleum Products, Liquid
and laboratory use to rate the ability of diesel fuels (both neat
Fuels, and Lubricants
and those containing additives) to release entrained or emulsi-
D4176 Test Method for FreeWater and Particulate Contami-
fied water when passed through fiberglass coalescing material.
nation in Distillate Fuels (Visual Inspection Procedures)
1.2 This test method is applicable to diesel fuels such as
D4177 Practice for Automatic Sampling of Petroleum and
Specification D975 Grade No. 1-D and Grade No. 2-D of all
Petroleum Products
sulfur levels, Specification D7467 biodiesel blends B6-B20,
D4306 Practice for Aviation Fuel Sample Containers for
and MIL-DTL-16884, naval distillate fuel (NATO F-76).
Tests Affected by Trace Contamination
NOTE 1—This test method is similar to Test Method D3948 which is
D4860 Test Method for FreeWater and Particulate Contami-
applicable to aviation turbine fuels.
nation in Middle Distillate Fuels (Clear and Bright Nu-
1.3 The values stated in SI units are to be regarded as
merical Rating)
standard. No other units of measurement are included in this
D6300 Practice for Determination of Precision and Bias
standard.
Data for Use in Test Methods for Petroleum Products,
1.4 This standard does not purport to address all of the Liquid Fuels, and Lubricants
safety concerns, if any, associated with its use. It is the
D6426 Test Method for Determining Filterability of Middle
responsibility of the user of this standard to establish appro- Distillate Fuel Oils
priate safety, health, and environmental practices and deter-
D7467 Specification for Diesel Fuel Oil, Biodiesel Blend
mine the applicability of regulatory limitations prior to use. (B6 to B20)
1.5 This international standard was developed in accor-
2.2 Military Standard:
3
dance with internationally recognized principles on standard-
MIL-DTL-16884 Fuel, Naval Distillate
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
3. Terminology
mendations issued by the World Trade Organization Technical
3.1 Definitions:
Barriers to Trade (TBT) Committee.
3.1.1 For definitions of terms used in this test method, refer
to Terminology D4175.
2. Referenced Documents
4 4
3.1.2 reference fluid, n—in MSEP and DSEP , [diesel
2
2.1 ASTM Standards:
separability] water separability tests a reference fluid base to
D975 Specification for Diesel Fuel
which a prescribed quantity of a known surface active agent
D1193 Specification for Reagent Water
has been added.
D3948 TestMethodforDeterminingWaterSeparationChar-
3.1.2.1 Discussion—The known surface active agent is typi-
acteristicsofAviationTurbineFuelsbyPortableSeparom-
cally bis-2-ethylhexyl sodium sulfosuccinate, commonly re-
eter
ferred to as AOT, dissolved in toluene.
1 3.1.3 strong surfactant, n—in petroleum fuels,surfaceactive
This test method is under the jurisdiction of ASTM Committee D02 on
Petroleum Products, Liquid Fuels, and Lubricants and is the direct responsibility of material that disarms filter separator elements, allowing water
Subcommittee D02.14 on Stability, Cleanliness and Compatibility of Liquid Fuels.
to pass.
Current edition approved July 1, 2022. Published August 2022. Originally
approved in 2006. Last previous edition approved in 2017 as D7261 – 17. DOI:
10.1520/D7261-22.
2 3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or Available for electronic download at ASSIST Quick Search (http://
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM quicksearch.dla.mil).
4
Standards volume information, refer to the standard’s Document Summary page on MSEP and DSEP are registered trademarks of EMCEE Electronics, Inc, 520
the ASTM website. Cypress Ave., Venice, FL 34285.
*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 ----------------------
D7261 − 2
...
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: D7261 − 17 D7261 − 22
Standard Test Method for
Determining Water Separation Characteristics of Diesel
1
Fuels by Portable Separometer
This standard is issued under the fixed designation D7261; 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 a rapid portable means for field and laboratory use to rate the ability of diesel fuels (both neat and
those containing additives) to release entrained or emulsified water when passed through fiberglass coalescing material.
1.2 This test method is applicable to diesel fuels such as Specification D975 Grade No. 1-D and Grade No. 2-D of all sulfur levels,
Specification D7467 biodiesel blends B6-B20, and MIL-DTL-16884, naval distillate fuel (NATO F-76).
NOTE 1—This test method is similar to Test Method D3948 which is applicable to aviation turbine fuels.
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.4 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, health, and environmental practices and determine the applicability of
regulatory limitations prior to use.
1.5 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:
D975 Specification for Diesel Fuel
D1193 Specification for Reagent Water
D3948 Test Method for Determining Water Separation Characteristics of Aviation Turbine Fuels by Portable Separometer
D4057 Practice for Manual Sampling of Petroleum and Petroleum Products
D4175 Terminology Relating to Petroleum Products, Liquid Fuels, and Lubricants
D4176 Test Method for Free Water and Particulate Contamination in Distillate Fuels (Visual Inspection Procedures)
D4177 Practice for Automatic Sampling of Petroleum and Petroleum Products
D4306 Practice for Aviation Fuel Sample Containers for Tests Affected by Trace Contamination
D4860 Test Method for Free Water and Particulate Contamination in Middle Distillate Fuels (Clear and Bright Numerical
Rating)
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
D02.14 on on Stability, Cleanliness and Compatibility of Liquid Fuels.
Current edition approved Dec. 1, 2017July 1, 2022. Published January 2018August 2022. Originally approved in 2006. Last previous edition approved in 20142017 as
D7261 – 14.D7261 – 17. DOI: 10.1520/D7261-17.10.1520/D7261-22.
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 ----------------------
D7261 − 22
D6300 Practice for Determination of Precision and Bias Data for Use in Test Methods for Petroleum Products, Liquid Fuels, and
Lubricants
D6426 Test Method for Determining Filterability of Middle Distillate Fuel Oils
D7224 Test Method for Determining Water Separation Characteristics of Kerosine-Type Aviation Turbine Fuels Containing
Additives by Portable Separometer
D7467 Specification for Diesel Fuel Oil, Biodiesel Blend (B6 to B20)
2.2 Military Standard:
3
MIL-DTL-16884 Fuel, Naval Distillate
3. Terminology
3.1 For definitions of terms used in this test method that are not shown below, refer to Test Methods D3948 and D7224.
3.1 Definitions:
3.1.1 For definitions of terms used in this test method, refer to Terminology D4175.
4 4
3.1.2 reference fluid, n—in MSEP and DSEP , [diesel separability] water separability tests a reference fluid base to which a
prescribed quantity of a known surface active agent has been added.
3.1.2.1 Discussion—
The know
...
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