ASTM D7261-13
(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 While filter separators have not been common in diesel fuel systems, they could become more prevalent with ULSD containing increased additive content to ensure clean, dry fuels in new engine designs. Weak surfactants, with slightly reduced DSEP ratings, do not 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 D975 Grade No. 1 and Grade No. 2 of all sulfur levels, and MIL-F-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 and health practices and determine the applicability of regulatory limitations prior to use.
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Designation: D7261 − 13
StandardTest 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* D4306 Practice for Aviation Fuel Sample Containers for
Tests Affected by Trace Contamination
1.1 This test method covers a rapid portable means for field
D4860 Test Method for FreeWater and Particulate Contami-
and laboratory use to rate the ability of diesel fuels (both neat
nation in Middle Distillate Fuels (Clear and Bright Nu-
and those containing additives) to release entrained or emulsi-
merical Rating)
fied water when passed through fiberglass coalescing material.
D6426 Test Method for Determining Filterability of Middle
1.2 This test method is applicable to diesel fuels such as
Distillate Fuel Oils
D975 Grade No. 1 and Grade No. 2 of all sulfur levels, and
D7224 TestMethodforDeterminingWaterSeparationChar-
MIL-F-16884, naval distillate fuel (NATO F-76).
acteristics of Kerosine-Type Aviation Turbine Fuels Con-
NOTE 1—This test method is similar to Test Method D3948 which is
taining Additives by Portable Separometer
applicable to aviation turbine fuels.
2.2 Military Standard:
1.3 The values stated in SI units are to be regarded as 3
MIL-F-16884 Fuel, Naval Distillate (NATO F-76)
standard. No other units of measurement are included in this
standard.
3. Terminology
1.4 This standard does not purport to address all of the
3.1 For definitions of terms used in this test method that are
safety concerns, if any, associated with its use. It is the
not shown below, refer to Test Methods D3948 and D7224.
responsibility of the user of this standard to establish appro-
3.2 Definitions:
priate safety and health practices and determine the applica-
4 4
3.2.1 reference fluid, n—in MSEP and DSEP [diesel
bility of regulatory limitations prior to use.
separability] water separability tests, a reference fluid base to
which a prescribed quantity of a known surface active agent
2. Referenced Documents
has been added.
2
2.1 ASTM Standards:
3.2.1.1 Discussion—The known surface active agent is typi-
D975 Specification for Diesel Fuel Oils
cally bis-2-ethylhexyl sodium sulfosuccinate, commonly re-
D1193 Specification for Reagent Water
ferred to as AOT, dissolved in toluene.
D3948 TestMethodforDeterminingWaterSeparationChar-
3.2.2 surfactant, n—in petroleum fuels, surface active ma-
acteristicsofAviationTurbineFuelsbyPortableSeparom-
terial (or surface active agent) that could disarm (deactivate)
eter
filter separator (coalescing) elements so that free water is not
D4057 Practice for Manual Sampling of Petroleum and
removed from the fuel in actual service.
Petroleum Products
3.2.2.1 Discussion—Technically, surfactants affect the inter-
D4176 Test Method for FreeWater and Particulate Contami-
facial tension between water and fuel which affects the
nation in Distillate Fuels (Visual Inspection Procedures)
tendency of water to coalesce into droplets.
D4177 Practice for Automatic Sampling of Petroleum and
3.2.3 strongsurfactant,n—inpetroleumfuels,surfaceactive
Petroleum Products
material that disarms filter separator elements, allowing water
to pass.
1
This test method is under the jurisdiction of ASTM Committee D02 on
3.2.3.1 Discussion—Strong surfactants can be refinery pro-
Petroleum Products and Lubricants and is the direct responsibility of Subcommittee
cess chemicals left in the fuel or contaminants introduced
D02.14 on Stability and Cleanliness of Liquid Fuels.
during transportation of the fuel.
Current edition approved May 1, 2013. Published May 2013. Originally
approved in 2006. Last previous edition approved in 2012 as D7261 – 12. DOI:
10.1520/D7261-13.
2 3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or AvailablefromStandardizationDocumentsOrderDesk,Bldg.4SectionD,700
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS.
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 − 13
3.2.4 weak surfactant, n—in petroleum fuels, surface active 5.3 While filter separators have not been common in
...
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 − 12 D7261 − 13
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.
This standard has been approved for use by agencies of the Department of Defense.
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 D975 Grade No. 1 and Grade No. 2 of all sulfur levels, and
MIL-F-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 and health practices and determine the applicability of regulatory
limitations prior to use.
2. Referenced Documents
2
2.1 ASTM Standards:
D975 Specification for Diesel Fuel Oils
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
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)
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
2.2 Military Standard:
3
MIL-F-16884 Fuel, Naval Distillate (NATO F-76)
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.
3.2 Definitions:
4 4
3.2.1 reference fluid, n—in MSEP and DSEP 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.
1
This test method is under the jurisdiction of ASTM Committee D02 on Petroleum Products and Lubricants and is the direct responsibility of Subcommittee D02.14 on
Stability and Cleanliness of Liquid Fuels.
Current edition approved Nov. 1, 2012May 1, 2013. Published April 2013May 2013. Originally approved in 2006. Last previous edition approved in 20082012 as
D7261D7261 – 12.–08. DOI: 10.1520/D7261-12.10.1520/D7261-13.
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 Standardization Documents Order Desk, Bldg. 4 Section D, 700 Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS.
4
MSEP and DSEP are registered trademarks of EMCEE Electronics, Inc, 520 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 − 13
3.2.1.1 Discussion—
The known surface active agent is typically bis-2-ethylhexyl sodium sulfosuccinate, commonly referred to as AOT, dissolved in
toluene.
3.2.2 surfactant, n—in petroleum fuels, surface active material (or surface active agent) that could disarm (deactivate) filter
separator (coalescing) elements so that free water is not removed from the fuel in actual service.
3.2.2.1 Discussion—
Technically, surfactants affect the interfacial tension between water and fuel which affects t
...
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