ASTM D7261-14
Standard Test Method for Determining Water Separation Characteristics of Diesel Fuels by Portable Separometer

Standard No.

ASTM D7261-14

Release Date

2014

Published By

American Society for Testing and Materials (ASTM)

Status

Be replaced

Replace By

ASTM D7261-17

Latest

ASTM D7261-22

Scope

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.

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 dete......

ASTM D7261-14 Referenced Document

• ASTM D1193 Standard Specification for Reagent Water
• ASTM D3948 Standard Test Method for Determining Water Separation Characteristics of Aviation Turbine Fuels by Portable Separometer
• ASTM D4057 Standard Practice for Manual Sampling of Petroleum and Petroleum Products
• ASTM D4176 Standard Test Method for Free Water and Particulate Contamination in Distillate Fuels (Visual Inspection Procedures)
• ASTM D4177 Standard Practice for Automatic Sampling of Petroleum and Petroleum Products
• ASTM D4306 Standard Practice for Aviation Fuel Sample Containers for Tests Affected by Trace Contamination
• ASTM D4860 Standard Test Method for Free Water and Particulate Contamination in Mid-Distillate Fuels (Clear and Bright Numerical Rating)
• ASTM D6426 Standard Test Method for Determining Filterability of Distillate Fuel Oils
• ASTM D7224 Standard Test Method for Determining Water Separation Characteristics of Kerosine-Type Aviation Turbine Fuels Containing Additives by Portable Separometer
• ASTM D975 Standard Specification for Diesel Fuel Oils

ASTM D7261-14 history

• 2022 ASTM D7261-22 Standard Test Method for Determining Water Separation Characteristics of Diesel Fuels by Portable Separometer
• 2017 ASTM D7261-17 Standard Test Method for Determining Water Separation Characteristics of Diesel Fuels by Portable Separometer
• 2014 ASTM D7261-14 Standard Test Method for Determining Water Separation Characteristics of Diesel Fuels by Portable Separometer
• 2013 ASTM D7261-13 Standard Test Method for Determining Water Separation Characteristics of Diesel Fuels by Portable Separometer
• 2012 ASTM D7261-12 Standard Test Method for Determining Water Separation Characteristics of Diesel Fuels by Portable Separometer
• 2008 ASTM D7261-08 Standard Test Method for Determining Water Separation Characteristics of Diesel Fuels by Portable Separometer
• 2007 ASTM D7261-07 Standard Test Method for Determining Water Separation Characteristics of Diesel Fuels by Portable Separometer
• 2006 ASTM D7261-06a Standard Test Method for Determining Water Separation Characteristics of Diesel Fuels by Portable Separometer
• 2006 ASTM D7261-06 Standard Test Method for Determining Water Separation Characteristics of Diesel Fuels by Portable Separometer