# US 2015/0020912 A1 · Duct > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2015/0020912 A1 - Document ID: US20150020912A1 - Status: Published application - Kind: A1 - Application number: 13/962,165 - Filed: 2013-08-08 - Published: 2015-01-22 - Earliest claimed: 2013-07-19 - Assignees: SF Ltd - Applicants: SF Ltd - Inventors: Sami O. CAGLAR - Web page: https://patentgrep.com/patent/US20150020912A1 ## CPC - F16L 11/14: made of rigid material, e.g. metal or hard plastics - F16L 51/022: {with a single corrugation} - F16L 55/00: Devices or appurtenances for use in, or in connection with, pipes or pipe systems (F16L1/00 - F16L53/00, F16L57/00, F16L59/00 take precedence; repairing or joining pipes on or under water F16L1/26; cleaning of pipes B08B9/02, e.g. removal of blockages B08B9/027; devices for preventing bursting of water pipes by freezing E03B7/10) - F23J 13/04: Joints; Connections - F23J 2213/202: between duct or stack sections - F23J 2213/204: Sealing arrangements - F23J 2213/40: Heat insulation fittings - Y10T 29/49826: Assembling or joining - F16L: PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL - F23J: REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES (combustion apparatus for consuming smoke or fumes, e.g. exhaust gases, F23G7/06) - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract There is disclosed a duct 10 for hot gases, such as a chimney, comprising first and second duct sections 20 each having a generally radially extending mating flange 30, 32. The duct sections 20 are disposed end-to-end such that the mating flanges 30, 32 cooperate with one another to form a joint. The duct also comprises a substantially annular sealing band 44 having a radially extending expansion channel 46 at least partly defined by first and second radially extending channel walls 52, 54. The sealing band 44 is disposed around the joint with the mating flanges 30, 32 disposed within the expansion channel 46. The mating flanges 30, 32 can move within the expansion channel 46 to accommodate dimensional changes of the duct 10 that may occur due to thermal effects. ## Claims ### Claim 1 A duct for hot gases, comprising: first and second duct sections each having a generally radially extending mating flange, wherein the duct sections are disposed end-to-end such that the mating flanges cooperate with one another to form a joint; and a substantially annular sealing band having a radially extending expansion channel at least partly defined by first and second radially extending channel walls, the sealing band being disposed around the joint with the mating flanges disposed within the expansion channel; wherein the mating flanges can move within the expansion channel to accommodate dimensional changes of the duct that may occur due to thermal effects. ### Claim 2 (depends on 1) A duct according to claim 1, wherein the outer diameter of expansion channel is greater than the outer diameter of the mating flanges. ### Claim 3 (depends on 1) A duct according to claim 1, wherein the inner diameter of the expansion channel is less than the outer diameter of the mating flanges. ### Claim 4 (depends on 1) A duct according to claim 1, wherein the sealing band comprises first and second side walls that extend away from the first and second channel walls respectively in directions that are oblique to the channel walls. ### Claim 5 (depends on 4) A duct according to claim 4, wherein the first and second side walls are radially spaced from side walls of the duct sections. ### Claim 6 (depends on 1) A duct according to claim 1, wherein the sealing band is moveable in a transverse plane with respect to the duct sections. ### Claim 7 (depends on 1) A duct according to claim 1, wherein the expansion channel is at least partly further defined by a channel end wall that spaces and connects the channel walls. ### Claim 8 (depends on 1) A duct according to claim 1, wherein the channel walls are substantially parallel to one another. ### Claim 9 (depends on 1) A duct according to claim 1, wherein the expansion channel axially urges the mating flanges towards one another. ### Claim 10 (depends on 1) A duct according to claim 1, wherein the sealing band comprises at least one fastener for securing the sealing band around the joint. ### Claim 11 (depends on 1) A duct according to claim 1, wherein the sealing band comprises at least two circumferentially extending parts that are secured together around the joint to form an annulus, and which can be moved apart such that during assembly the sealing band can be located around the joint. ### Claim 12 (depends on 11) A duct according to claim 11, wherein the sealing band comprises at least two completely separable circumferentially extending parts. ### Claim 13 (depends on 1) A duct according to claim 1, further comprising a gasket disposed between the mating flanges. ### Claim 14 (depends on 1) A duct according to claim 1, wherein the expansion channel has a U-shaped or rectangular cross-section in an axial plane. ### Claim 15 (depends on 1) A duct according to claim 1, further comprising a substantially annular securing band located around the duct sections so as to secure the duct sections together. ### Claim 16 (depends on 1) A sealing band for use with a duct in accordance to claim 1. ### Claim 17 (depends on 1) A kit of parts for forming the duct in accordance with claim 1, the kit of parts comprising: first and second duct sections each having a generally radially extending mating flange; and a substantially annular sealing band having a radially extending expansion channel at least partly defined by first and second radially extending channel walls. ### Claim 18 A duct, sealing band or kit of parts substantially as described herein with reference to the accompanying drawings. ### Claim 19 (depends on 1) A method of manufacturing a duct in accordance with claim 1, the method comprising: disposing first and second duct sections each having a generally radially extending mating flange end-to-end such that the mating flanges cooperate with one another to form a joint; and disposing a substantially annular sealing band having a radially extending expansion channel at least partly defined by first and second radially extending channel walls around the joint with the mating flanges disposed within the expansion channel. ### Claim 20 (depends on 19) A method according to claim 19 and substantially as described herein.