BS EN 13443-1:2002 pdf download
BS EN 13443-1:2002 pdf download.Water conditioning equipment inside buildings- Mechanical filters – Part 1: Particle rating 80 μm to 150 um-Requirements for performances, safety and testing.
The selection of materials shall be the responsbility of the manufacturer, provided that the complete filter satisfies the requirements of EN 1567.
NOTE The materials and coatings used should not contaimnale or change the drinking water. when In normal or accidental contact 4 to the maximum designed temperature
The requirements with regard to the effects of materials on drinking water quality, are specified in national regulations.
The manufacturer shall state in hIs technical literature what materials and coatings are used. The materials, in particular copper alloys, shall conform to relevant national standards or recommendations- These references shall be stated.
Copper-inc alloys containing more than 10 % uric are subject to dezincdication when submitted to water capable of dezmcification. In countries where the use of products made of dezincification resistant matenal is required, the product have to guarantee a dezincitlcalion depth less than 200 pm in any direction. They have to be tested and marked in accordance with EN ISO 6509 and have to be marked In compharice alth the lncations under clause 9 of (he present standard
6 General design requirements
6.1 Backwashable filters
Backwashable filters shall be able to be cleaned without the aid of toots. No substances shall be allowed to penetrate Into the dnnking water supply as a result of the cleaning operation. After completion of backwashwig, the original grade of filtration and pressure drop shall be recovered.
Backwashable filters shall be provided with a backwash water outlet, conforming to EN 1717.
It shall be possitile to clean the filter mounted in any of the positions specified by the manufacturer with no
interruption of filtered water supply during backwash.ng.
6.2 SIngle-use filters
Single use filters shall be designed In such a way that the filler elements can be replaced without any risk of contamination of the drinking waler. It shall be possible to replace the filter mounted In any of the positions specified by the manufacturer.
Any tools used in this process shal not come into contact with drinking water and shall be provided by the manufacturer. If specific tools are necessary they shaM be supplied by the manufacturer.
Replacement filter elements shall be single packaged to prevent contamination froni outside.
6.3 Thermal stability
Filters shall be designed to withstand room and water temperatures of at least 30’C,
8.4.2.2 Filtration test procedure
Carry out one test per fraction at the upper and one at the lower range 01 filter partide rating. If necessary, carry out
a third test on a fraction between these values. This applies in particular to filters of intermediate separation
performance. The quantity of glass beads used for the suspension shall be 1 g for filters up to nominal size DN 25.
2 g for filters with nominal sizes DN 32 and DN 40, and 4 g for filters with nominal sizes over DN 40.
After thorough stirring in the mixing vessel, introduce the suspension into the water flow via the wiector. Use a wetting agent If any difficulties arise dunng the mixing of the suspension. Complete the introduction of the total quantity of suspension into the water within 5 mm to 10 mm, so as to ensure that the total quantity of suspension is flushed into the filter. Determine the particle size distribution in the separated water flow via the sampling point by sieving In accordance with ISO 2591-1 or by particle counting fellowing the recommendations In 133) ISO 13320-1 €1. Plot the results in accordance with ISO 9276-1 (Figure 8).
8.4.2.3 Blank test
Carry out a blank test for each filtration test in the manner described above, but exclude the filter element.
8.4.2.4 Calculation
The results of the blank test shall be taken as representing 100 % of the counted particles Calculate the results of the filtration test for each particle size fraction as a percentage of the blank test.
At least one measurement shall be below the 10 % level and at least one measurement shal be above the 90 % level, Otherwise, repeat the test.
Carry out the blank test and the filtration tests three times. Replace the cartridges of single use filters or back washable filters after the collection of each fraction. The deviation in the three results shall not exceed ± 5 %.
8.4,3 ExpressIon of results
The requirements are fulfilled if the resulting filtration curve crosses the 10 % line in the upper range (between 100 pm and 150 pm), and the 90 % line in the lower range (between 80 pm and 120 pm).
