# US 2018/0025798 A1 · Finned strainer > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0025798 A1 - Document ID: US20180025798A1 - Status: Published application - Kind: A1 - Application number: 15/611,776 - Filed: 2017-06-01 - Published: 2018-01-25 - Earliest claimed: 2008-01-30 - Assignees: Atomic Energy of Canada Limited - Applicants: Atomic Energy of Canada Limited - Inventors: DAVID BRUCE RHODES; JAMES EDWARD ALLEN MACGREGOR - Web page: https://patentgrep.com/patent/US20180025798A1 ## CPC - G21D 1/02: Arrangements of auxiliary equipment - B01D 29/333: {with corrugated, folded filtering elements} - B01D 29/39: with hollow discs side by side on, or around, one or more tubes, e.g. of the leaf type - Y02E 30/30: Nuclear fission reactors - G21D: NUCLEAR POWER PLANT - 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) - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION ## Abstract The present invention relates to filters used to remove debris from water being sucked into a piping system. It has particular application use in nuclear power plants, which, after a loss of coolant accident, must pump cooling water back into the reactor core from a collection sump. This water may contain various types of debris that must be removed before the water is sent back into the reactor cooling system. There are restrictions on the allowable pressure drop across the strainer and the space available for installing this equipment. The finned strainer of the present invention addresses these issues while maximizing the quantity of debris filtered from the water. ## Claims ### Claim 1 A strainer for filtering debris from a fluid: i) an elongated header defining an enclosed flowpath, having an outlet in fluid communication with a suction source and a plurality of inlet apertures disposed along the length of said flowpath, said flowpath exhibiting a pressure drop in the direction of fluid flow; ii) a strainer element disposed in each said inlet aperture for straining debris from fluid entering said flowpath; iii) a flow controlling device for maintaining substantially uniform fluid flow through strainer elements located at different positions along said flowpath. ### Claim 2 (depends on 1) The strainer of claim 1 wherein the flow controlling device comprises an orifice for producing a pressure drop between an inlet aperture and the flowpath located at a position closer to said suction source that is greater than the pressure drop between an inlet aperture and said flowpath located at a position farther from said suction source. ### Claim 3 (depends on 2) The strainer of claim 2 wherein said orifice is in the form of a nozzle for accelerating the fluid entering said flowpath in a direction substantially parallel thereto. ### Claim 4 (depends on 3) The strainer of claim 3 wherein said orifice is formed in a baffle disposed in said header, said baffle defining a collection channel enclosing a plurality of apertures. ### Claim 5 (depends on 4) The strainer of claim 4 wherein the header has a generally a planar side-wall and said inlet apertures are a series of substantially parallel slots formed in said side-wall in a direction transverse to said flowpath. ### Claim 6 (depends on 5) The strainer of claim 5 wherein said strainer elements are in the form of fins projecting outwardly from the apertures in said planar side-wall. ### Claim 7 A strainer for filtering debris from a fluid comprising a header defining an enclosed volume and having an outlet in fluid communication with a suction source, said header having a plurality of inlet aperture slots formed therein, a fin-like strainer element projecting outwardly from each aperture slot for straining debris from said fluid, each said strainer element comprising a perimeter frame and a pair of fluid permeable screens fixed thereto in opposed spaced relation, and at least one fluid flow channel therebetween in fluid communication with said enclosed volume through a marginal side edge of said frame and said aperture slot. ### Claim 8 (depends on 7) The strainer of claim 7 wherein the fluid permeable screens are formed of perforated metal sheet. ### Claim 9 (depends on 8) The strainer of claim 8 further comprising a corrugated metal spacer disposed between and maintaining said fluid permeable screens in spaced relation, a plurality of said flow channels being defined between said corrugated metal spacer and said fluid permeable screens. ### Claim 10 (depends on 9) The strainer of claim 9 wherein said perimeter frame is impermeable to fluid except at said one marginal side edge. ### Claim 11 (depends on 8) The strainer of claim 8 wherein the fluid permeable screens are each formed of corrugated metal mesh having a plurality of parallel peaks and valleys, said screens being maintained in opposed spaced relation by contact at alternating peaks and defining a plurality of said flow channels therebetween. ### Claim 12 (depends on 11) The strainer of claim 11 wherein said perimeter frame is impermeable to fluid except at said one marginal side edge.