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Crepines (Underdrain Nozzles)


    High performance patented Crepines (Underdrain Nozzles) with unique grooved discs.

Collapse proof

    One of the main causes of filtering systems stoppage is crepine (underdrain nozzle) collapse, with sand entering the system. Then a disassembly and early filter retrofitting are required so one can install the same crepine and continue with the same risks.

    The shell of our crepine is manufactured in high fiberglass engineering plastic, which along with its shape and the overlapping disks, makes it totally collapse proof. Stepping on them won't cause damage even during assembly. This eliminates the cost of early filter disassembly for repair.

Very low pressure drop

    The constructive disk shape and the number of them assembled on the same crepine, provide it a total 23.8 cm² passing area, single opening (each groove) of 0.4 mm.

    This provides very low pressure loss, being possible to use fewer units per square meter, i.e. the spacing between crepines can be extended from 12 to 15 cm (usually used in other crepines ) to 17 to 20 cm with Hidro Solo crepines. The existing crepines on the market have a 2 to 3 cm² passing area, in other words, ten times less.

    As the backwash flow rate is 3 to 4 times the operation flow, this large passage and low pressure loss area become even more important.

Support bed

    Using our 0.4 mm calibrated discs Underdrain Nozzle, the cost can be reduced even more with the suppression of the support bed.

    A wider passage disc is also available aiming to optimize its performance when used in downstream filters containing support bed and in upstream filters. This disc has 2 mm calibrated passage and 30 cm² of open area, this area is even larger than our traditional 23.8 cm² disc.

Body: Nylon + Fiberglass

Discs: Polypropylene

    We manufacture several options of thread sizes, for different bottoms of filters. There are options too for crepine with calibrated tail for air injection during backwash.

VIDEOS

Example of air uniform dispersion