Slotted scallop-shaped underdrain screened lateral elements

Details Slotted scallop-shaped underdrain screened lateral elements Slotted scallop-shaped underdrain screened lateral elements

1991-05-13

1992-06-02

Dawson, Robert A.

Liquid purification or separation

Particulate material type separator, e.g., ion exchange or...

Particular liquid receiving means or foraminous bed retainer

210293, 21049701, B01D 2124

Patent

active

051184192

ABSTRACT:
An underdrain assembly for a bed of filter media includes a plurality of elongated screen lateral elements which each have a generally flat bottom surface and a convexly curved upper surface which has flow openings therein. The lateral elements each have a width substantially greater than their height and include a means defining a generally tubular-shaped surface positioned internally thereof. The generally tubular-shaped surface includes flow distribution openings which have a total open area less than the total area of the flow openings in the curved upper surfaces of the lateral elements. In various embodiments, the generally tubular-shaped surfaces are shown as comprising a single tube, a plurality of tubes, and a tube defined by the portions of a plurality of adjacent channel-shaped members whose leg portions support the curved upper surface of the screen lateral elements.

REFERENCES:
patent: 377387 (1888-02-01), Jewell
patent: 2084351 (1937-06-01), Luce
patent: 4013556 (1977-03-01), Evans
patent: 4276265 (1981-06-01), Gillespie
patent: 4604199 (1986-08-01), Yoritomi
Bulletin AJU-100, F. B. Leopold Company, "Universal Underdrain", copyright 1987.
Brochure #UD0690, Johnson Filtration Systems, Inc., "Johnson Underdrain Systems", distributed beginning Jun. 1990.

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