ISO 16889:2022 pdf – Hydraulic fluid power — Filters — Multi-pass method for evaluating filtration performance of a filter element.
1 Scope This document describes the following: — a multi-pass filtration performance test with continuous contaminant injection for hydraulic fluid power filter elements; NOTE 1 For the background interlaboratory study used to verify the test methodology, see Annex D. — a procedure for determining the contaminant capacity, particulate removal and differential pressure characteristics; — a test currently applicable to hydraulic fluid power filter elements that exhibit an average filtration ratio greater than or equal to 75 for particle sizes ≥ 25 µm(c), and a final reservoir gravimetric level of less than 200 mg/L; NOTE 2 It is necessary to determine by validation the range of flow rates and the lower particle size limit that can be used in test facilities. — a test using ISO medium test dust (ISO MTD) contaminant and a test fluid in accordance with Annex A. This document is intended to provide a test procedure that yields reproducible test data for appraising the filtration performance of a hydraulic fluid power filter element without influence of electrostatic charge. This document applies to three test conditions: — test condition 1, with a base upstream gravimetric level of 3 mg/L; — test condition 2, with a base upstream gravimetric level of 10 mg/L; — test condition 3, with a base upstream gravimetric level of 15 mg/L. 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 1219-1, Fluid power systems and components — Graphical symbols and circuit diagrams — Part 1: Graphical symbols for conventional use and data-processing applications ISO 2942, Hydraulic fluid power — Filter elements — Verification of fabrication integrity and determination of the first bubble point
ISO 4405, Hydraulic fluid power — Fluid contamination — Determination of particulate contamination by the gravimetric method ISO 5598, Fluid power systems and components — Vocabulary ISO 11171, Hydraulic fluid power — Calibration of automatic particle counters for liquids ISO 11943:2021, Hydraulic fluid power — Online automatic particle-counting systems for liquids — Methods of calibration and validation ISO 12103-1:2016, Road vehicles — Test contaminants for filter evaluation — Part 1: Arizona test dust 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 5598 and the following apply. ISO and IEC maintain terminology databases for use in standardization at the following addresses: — ISO Online browsing platform: available at https:// www .iso .org/ obp — IEC Electropedia: available at https:// www .electropedia .org/ 3.1 General terms 3.1.1 contaminant mass injected mass of specific particulate contaminant injected into the test circuit to obtain the terminal differential pressure 3.1.2 rest conductivity electrical conductivity at the initial instant of current measurement after a d.c. voltage is impressed between electrodes Note 1 to entry: It is the reciprocal of the resistance of uncharged fluid in the absence of ionic depletion or polarization. 3.1.3 retained capacity mass of the specific particulate contaminant effectively retained by the filter element when the terminal element differential pressure is reached 3.2 Terms related to differential pressure 3.2.1 differential pressure difference between the tested component inlet and outlet pressure as measured under the specified conditions Note 1 to entry: See Figure 1 for a graphical depiction of differential pressure terms.
5 General procedures 5.1 Set up and maintain apparatus in accordance with Clauses 6 and 7. 5.2 Validate equipment in accordance with Clause 8. 5.3 Run all tests in accordance with Clauses 9, 10 and 11. 5.4 Analyse test data in accordance with Clause 12. 5.5 Present data from Clauses 10, 11 and 12 in accordance with the requirements of Clause 13. 6 Test equipment 6.1 Suitable timer. 6.2 Automatic particle counter(s) (APCs), calibrated in accordance with ISO 11171. 6.3 ISO medium test dust (ISO MTD, ISO 12103-1 — A3), in accordance with ISO 12103-1, dried at 110 °C to 150 °C for not less than 1 h for quantities less than 200 g. For quantities greater than 200 g, dry for at least 30 min per additional 100 g. For use in the test system, mix the test dust into the test fluid, mechanically agitate, then disperse ultrasonically with a power density of 3 000 W/m 2 to 10 000 W/m 2 . Ensure that the ISO MTD used conforms to all the requirements of ISO 12103-1 — A3, especially the volume particle size distribution shown in ISO 12103-1:2016, Table 2. NOTE This dust is commercially available. For availability of ISO MTD, contact the ISO secretariat service or national members of ISO. 6.4 On-line counting system, and dilution system if necessary, validated in accordance with ISO 11943.