Abstract: Method and apparatus for treating raw water by introducing the raw water and a flocculating agent into a cylindrical container, preferably in a tangential manner of flow between the cylindrical container wall and a baffle spaced radially inward from the container wall, flowing the fluid radially inward towards the center of the container to a central conduit extending axially upward in the container and opening at the internal bore of the conduit through the bottom of the container, the central conduit being surrounded by a coaxial pipe having a plurality of circumferentially defined, spaced openings therein to induce a radial, i.e., from the wall of the container to the central conduit, flow of water with minimal axial flow components in order to facilitate settling of the flocculated particles from the treated water.

Abstract: Internal sleeve seal for sealing pipelines by inserting into the pipeline a tube-like collar member of pliable but not necessarily elastic material having locating means preferably in the form of dovetail seals on either end, positioning the seal with two ring cushions of elastic gumlike material located in annular recessed portions on the collar member located on either side of the portion of the pipeline to be sealed, and radially enlarging the collar member at the recessed portions to urge the ring cushions into sealing contact with the interior surfaces of the pipe while confining the ring cushions to the depressions between axially parallel annular surfaces on the collar member defining the recessed portions to effectively seal the pipe between the ring cushions and the portion of the collar member therebetween.