# US 9,433,879 B2 · Decanter > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,433,879 B2 - Document ID: US9433879B2 - Status: Granted - Kind: B2 - Application number: 14/362,325 - Filed: 2012-11-26 - Published: 2014-12-04 - Granted: 2016-09-06 - Earliest claimed: 2011-12-08 - Assignees: Invent Umwelt-Und Verfahrenstechnik AG - Applicants: Invent Umwelt-Und Verfahrenstechnik AG - Inventors: Marcus Hoefken - Web page: https://patentgrep.com/patent/US9433879B2 ## CPC - B01D 21/2444: {Discharge mechanisms for the classified liquid} - B01D 21/0003: {Making of sedimentation devices, structural details thereof, e.g. prefabricated parts} - B01D 21/2427: {The feed or discharge opening located at a distant position from the side walls} - B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28) ## Abstract The invention relates to a decanter (2) for separating a supernatant arranged above a sludge in a settlement tank (1), wherein a withdrawal device (5, 16) with a receiving pipe (9, 18), which extends in the manner of a T-piece approximately perpendicular to a discharge pipe (4, 17), is attached to one end of the discharge pipe (4, 17). To reduce the production cost, it is proposed in accordance with the invention for the receiving pipe (9, 18) to be a polygonal pipe produced from sheet metal. ## Claims ### Claim 1 A decanter for separating a supernatant arranged above a sludge in a settlement tank, wherein a withdrawal device with a receiving pipe, which extends in the manner of a T-piece approximately perpendicular to a discharge pipe, is attached to one end of the discharge pipe, wherein the other end of the discharge pipe is held pivotably in a pivot bearing, wherein the receiving pipe is a polygonal pipe which is produced from a plurality of stainless steel plate elements having a thickness in a range from 0.4 to 3.5 mm which are interconnected by rivets. ### Claim 2 (depends on 1) The decanter according to claim 1, wherein the discharge pipe is a further polygonal pipe produced from a sheet metal. ### Claim 3 (depends on 2) The decanter according to claim 2, wherein the further polygonal pipe is formed from a plurality of further angled stainless steel plate elements. ### Claim 4 (depends on 3) The decanter according to claim 3, wherein the further stainless steel plate elements have a thickness in a range of 0.4 to 3.5 mm. ### Claim 5 (depends on 2) The decanter according to claim 2, wherein the polygonal pipe and/or the further polygonal pipe is/are a 5-sided, 6-sided, 7-sided or 8-sided polygonal pipe. ### Claim 6 (depends on 1) The decanter according to claim 1, wherein the withdrawal device is formed substantially symmetrically about a central plane running through the receiving pipe. ### Claim 7 (depends on 6) The decanter according to claim 6, wherein a cross-sectional area of the polygonal pipe reduces on either side of the central plane. ### Claim 8 (depends on 6) The decanter according to claim 6, wherein the polygonal pipe has a multiplicity of apertures for passage of the supernatant. ### Claim 9 (depends on 8) The decanter according to claim 8, wherein the apertures are arranged in at least one aperture plane disposed perpendicular to the central plane. ### Claim 10 (depends on 8) The decanter according to claim 8, wherein a deflection device produced from an angled sheet metal is attached to an outer face of the polygonal pipe. ### Claim 11 (depends on 10) The decanter according to claim 10, wherein the deflection device is attached by means of spacers at a predefined distance from the apertures. ### Claim 12 (depends on 1) The decanter according to claim 1, wherein at least one flow resistance element is provided within the polygonal pipe for homogenisation of a flow rate. ### Claim 13 (depends on 1) The decanter according to claim 1, wherein the withdrawal device is provided approximately centrally with a connection piece for connection to the discharge pipe. ### Claim 14 (depends on 13) The decanter according to claim 13, wherein the connection piece is integrated into the polygonal pipe. ### Claim 15 (depends on 1) The decanter according to claim 1, wherein the stainless steel plate elements have the thickness in the range from 1.0 to 2.0 mm.