21/30429426 DC

This standard 21/30429426 DC BS ISO 16889.2. Hydraulic fluid power. Filters. Multi-pass method for evaluating filtration performance of a filter element is classified in these ICS categories:

• 23.100.60 Filters, seals and contamination of fluids

This International Standard describes the following:

1. a multi-pass filtration performance test with continuous contaminant injection for hydraulic fluid power filter elements;

2. a procedure for determining the contaminant capacity, particulate removal and differential pressure characteristics;

3. 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 u 25 µm(c), and a final reservoir gravimetric level of less than 200 mg/L;

   NOTE

   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.

4. a test using ISO medium test dust contaminant and a test fluid in accordance with Annex A.

This International Standard 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 International Standard applies to three test conditions:

1. test condition 1, with a base upstream gravimetric level of 3 mg/L;

2. test condition 2, with a base upstream gravimetric level of 10 mg/L;

3. test condition 3, with a base upstream gravimetric level of 15 mg/L.