BS ISO 11009:2021 pdf download – Petroleum products and lubricants — Determination of water washout characteristics of lubricating greases 1 Scope This document specifies a method for evaluating the resistance of a lubricating grease to washout by water from a bearing, when tested at 38 °C or 79 °C under specified laboratory test conditions. This test method estimates the resistance of greases to washout from ball bearings under specified conditions. No formal correlation with field service has been established so far. This document is used for development and specification purposes. NOTE For the purposes of this document, the term “% (m/m)” is used to represent the mass fraction. 2 Normative references The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 15, Rolling bearings — Radial bearings — Boundary dimensions, general plan ISO 1998-1, Petroleum industry — Terminology — Part 1: Raw materials and products ISO 3696, Water for analytical laboratory use — Specification and test methods ISO 23572, Petroleum products — Lubricating greases — Sampling of greases 3? Terms? and? definitions For the purposes of this document, the terms and definitions given in ISO 1998-1 apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses: — ISO Online browsing platform: available at https://www.iso.org/obp — IEC Electropedia: available at http://www.electropedia.org/ 4 Principle A test portion of grease is packed in a ball bearing inserted in a housing with specified clearances. The bearing is rotated at 63 rad/s ± 3 rad/s (600 min −1 ± 30 min −1 ). Water, controlled at a specified test temperature, impinges on the bearing housing from a nozzle with a diameter of 1 mm, at a rate of 5 ml/s ± 0,5 ml/s. The distance between the end of the nozzle and the shield of the housing is 57 mm. The water jet is set to strike the bearing 6 mm ± 2 mm above the upper edge of the shield. The amount of grease washed out in 60 min ± 5 min is a measure of the resistance of the grease to water washout. In addition, the washer fixed at the end of the rotating shaft shall be very well centred...
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