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    ASTM D7224 - 20

    Método de prueba estándar para la determinación de las características de separación de agua de combustibles para turbinas de aviones, de tipo keroseno y con aditivos, mediante separómetro portátil

    Active Standard ASTM D7224 Developed by Subcommittee: D02.J0.05

    Book of Standards Volume: 05.03


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    Significance and Use

    5.1 This test method provides a measurement of the presence of surfactants in aviation turbine fuels. Like previous obsolete Test Methods D2550 and D3602 and current Test Method D3948, this test method can detect trace amounts of refinery treating chemicals in fuel. The test methods can also detect surface active substances added to fuel in the form of additives or picked up by the fuel during handling from point of production to point of use. Some of these substances degrade the ability of filter separators to separate free water from the fuel.

    5.2 This test method yields approximately the same (low) MSEP ratings as Test Method D3948 for fuels that contain strong surfactants.

    5.2.1 This test method will give approximately the same MSEP ratings for Jet A, Jet A-1, JP-5, JP-7, and JP-8 fuels as Test Method D3948 when testing reference fluids.

    5.3 The MSEP ratings obtained by this test method are less affected by weak surfactants than Test Method D3948. Somewhat higher MSEP ratings for Jet A, Jet A-1, JP-5, JP-7, and JP-8 fuels are obtained by this test method than those obtained by Test Method D3948 when additives such as static dissipater additives (SDA) and corrosion inhibitors are present in the fuel. This correlates with the satisfactory performance of filter separators for such fuels, when wet. However, these same additives adversely affect the MSEP ratings obtained by Test Method D3948 by erroneously indicating that such additized fuels would significantly degrade the ability of filter separators to separate free water from the fuel in actual service.

    5.4 The Micro-Separometer instrument has an effective measurement range from 50 to 100. Values obtained outside of those limits are undefined and invalid.

    Note 1: In the event a value greater than 100 is obtained, there is a good probability that light transmittance was reduced by material, typically water, contained in the fuel that was used to set the 100 reference level. During the coalescing portion of the test, the contaminating material as well as the 50 µL ± 1 µL of distilled water was subsequently removed during this 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. Alcance

    1.1 Este método de prueba abarca un medio portátil rápido, para uso en campo y en el laboratorio, para clasificar la capacidad de liberación de agua retenida o emulsionada que tienen los combustibles para turbinas de aviones de tipo keroseno, tanto los que están en estado puro como los que contienen aditivos, cuando se los hace pasar por material coalescente de fibra de vidrio.

    1.1.1 Este método de prueba es aplicable a los combustibles para turbinas de aviones de tipo keroseno, incluyendo: Jet A y Jet A-1 (tal como se los describe en la Especificación D1655); JP-5, JP-7, JP-8 y JP-8+100. (Consulte la Sección 6).

    1.2 Los valores indicados en unidades del Sistema Internacional (SI) deben considerarse como estándar. Los valores dados entre paréntesis después de las unidades del Sistema Internacional (SI) se proporcionan únicamente para fines informativos, y no se consideran estándar.

    1.3 Este estándar no pretende abordar todas las inquietudes de seguridad, en caso de existir alguna, relacionadas con su uso. Es responsabilidad del usuario de este estándar establecer las prácticas de salud, prácticas de seguridad y prácticas ambientales apropiadas, y determinar la aplicabilidad de las limitaciones normativas antes de su uso. Para ver enunciados de advertencia específicos, consulte de 8.2 a 8.5.

    1.4 Este estándar internacional fue desarrollado de conformidad con principios de estandarización reconocidos a nivel internacional y establecidos en la Decisión sobre Principios para el Desarrollo de Estándares, Guías y Recomendaciones Internacionales (Decision on Principles for the Development of International Standards, Guides and Recommendations) publicada por el Comité de Acuerdo sobre Obstáculos Técnicos al Comercio (Technical Barriers to Trade, TBT) de la Organización Mundial del Comercio.

    2. Documentos Citados