B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
B01D 24/24 (2006.01) B01D 35/02 (2006.01) B01D 35/30 (2006.01)
Patent
CA 2599767
An embedded geometrically variable filter underdrain header and a method for constructing such a filter. Often the variation is a decrease in cross section along the header from the backwash media source, which avoids a pressure loss as liquid is diverted to the laterals along the header. The header is formed inside a filter underdrain basin and is embedded in the basin. The method for constructing the basin and header includes providing a mold for the basin and the header and filling the molds with concrete by pouring concrete into the area between the interior of the mold for the basin and the exterior of the mold for the header. After the concrete cures, the mold for the basin may or may not be removed, while the mold for the header is kept in place.
Ekholm Michael R.
Steinke Thomas J.
Watson Mark E.
Goodwin Mckay
Weatherford/lamb Inc.
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