ISO 6247 pdf download

ISO 6247 pdf download.Petroleum products — Determination of foaming characteristics of lubricating oils 1 Scope This International Standard specifies a method for the determination of the foaming characteristics of lubricating oils at specified moderate temperatures. It is applicable to lubricants which may or may not contain additives to modify or suppress the tendency to form stable foams. The ratings used to describe the foaming tendency and/or stability are empirical. NOTE 1 This method may be used to indicate potential problems in lubrication, cavitation and loss in systems where foam formation adversely affects equipment operation. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 3696:1 987, Water for analytical laboratory use – Specification and test methods. ISO 6353-2:1 983, Reagents for chemical analysis – Part 2: Specifications – First series. ISO 6353-3:1 987, Reagents for chemical analysis – Part 3: Specifications – Second series. 3 Terms and definitions For the purposes of this International Standard, the following definitions apply. 3.1 diffuser device for dispersing gas into liquid 3.2 foam a collection of bubbles formed in, or on the surface of, a liquid in which the air (gas) is the major component on a volumetric basis 3.3 lubricant any material interposed between two surfaces that reduces the friction or wear between them 3.4 maximum pore diameter the diameter of a capillary of circular cross-section, expressed in micrometres, which is equivalent, with respect to surface tension effects, to the largest pore of the diffuser under consideration 3.5 permeability the flow of gas through the gas diffuser, in millilitres per minute, under a gas pressure of 2,45 kPa 4 Principle The test portion, maintained at 24 °C, is blown with air at a constant rate for 5 min, then allowed to settle for 1 0 min. The volume of foam is measured at the end of each period. The test is repeated on a second test portion at 93,5 °C, and then, after collapsing the foam, at 24 °C. 5 Reagents and materials During the analysis, unless otherwise...