ASTM D1401 - 12

    Standard Test Method for Water Separability of Petroleum Oils and Synthetic Fluids

    Active Standard ASTM D1401 | Developed by Subcommittee: D02.C0.02

    Book of Standards Volume: 05.01


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    Significance and Use

    This test method provides a guide for determining the water separation characteristics of oils subject to water contamination and turbulence. It is used for specification of new oils and monitoring of in-service oils.

    1. Scope

    1.1 This test method covers measurement of the ability of petroleum oils or synthetic fluids to separate from water. Although developed specifically for steam-turbine oils having viscosities of 28.890 mm2/s at 40°C, this test method may be used to test oils of other types having various viscosities and synthetic fluids at other test temperatures. It is recommended, however, that the test temperature be raised to 82 ± 1°C when testing products more viscous than 90 mm2/s at 40°C. For higher viscosity oils where there is insufficient mixing of oil and water, Test Method D2711 is recommended. Other test temperatures such as 25°C may also be used. A1% sodium choloride (NaCl) solution or synthetic seawater may be used in place of distilled water when testing certain oils or fuels used in marine applications.

    1.2 When testing synthetic fluids whose relative densities are greater than that of water, the procedure is unchanged, but it should be noted that the water will probably float on the emulsion or liquid.

    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. For specific warning statements, see Section 6.


    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    D665 Test Method for Rust-Preventing Characteristics of Inhibited Mineral Oil in the Presence of Water

    D1141 Practice for the Preparation of Substitute Ocean Water

    D1193 Specification for Reagent Water

    D2711 Test Method for Demulsibility Characteristics of Lubricating Oils

    D4057 Practice for Manual Sampling of Petroleum and Petroleum Products

    ISO Standards

    BSENISO3696:1995 Water for analytical laboratory use - Specification and test methods


    ICS Code

    ICS Number Code 75.040 (Crude petroleum); 75.120 (Hydraulic fluids)

    UNSPSC Code

    UNSPSC Code 15101508(Crude oil)


    DOI: 10.1520/D1401-12

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