# US 2025/0084792 A1 · Fuel containment structure for engine fuel delivery system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2025/0084792 A1 - Document ID: US20250084792A1 - Status: Published application - Kind: A1 - Application number: 18/367,262 - Filed: 2023-09-12 - Published: 2025-03-13 - Earliest claimed: 2023-09-12 - Assignees: Pratt & Whitney Canada Corp. - Applicants: Pratt & Whitney Canada Corp. - Inventors: Mateusz Ozog; Assaf Farah - Web page: https://patentgrep.com/patent/US20250084792A1 ## CPC - F02C 7/222: {Fuel flow conduits, e.g. manifolds} - F02C 3/22: the fuel or oxidant being gaseous at standard temperature and pressure (F02C3/28 takes precedence) - F02C 7/22: Fuel supply systems - F02C 7/228: Dividing fuel between various burners - F05D 2220/323: for aircraft propulsion, e.g. jet engines - F05D 2240/14: Casings or housings protecting or supporting assemblies within - F05D 2260/602: Drainage - F05D 2260/605: Venting into the ambient atmosphere or the like - F05D 2260/608: Aeration, ventilation, dehumidification or moisture removal of closed spaces - F02C: GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS (construction of turbines F01D; jet-propulsion plants F02K; construction of compressors or fans F04; generating combustion products of high pressure or high velocity F23R; using gas turbines in compression refrigeration plants F25B11/00) - F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS ## Abstract An engine system is provided that includes an engine core, a fuel containment structure, a fuel containment plenum and a fuel delivery system. The engine core includes an engine housing structure which houses a compressor section, a combustor section and a turbine section. The fuel containment structure is outboard of and is connected to the engine housing structure. The fuel containment plenum is formed by and is located between the fuel containment structure and the engine housing structure. The fuel delivery system includes a plurality of fuel injectors, a fuel supply line and a fuel manifold fluidly coupling the fuel supply line to the fuel injectors. The fuel manifold and a connection between the fuel manifold and the fuel supply line are arranged within the fuel containment plenum. ## Claims ### Claim 1 An engine system, comprising: an engine core including a flowpath, a compressor section, a combustor section, a turbine section and an engine housing structure, the flowpath extending through the compressor section, the combustor section and the turbine section from an inlet into the flowpath to an exhaust from the flowpath, the engine housing structure housing the compressor section, the combustor section and the turbine section, and the engine housing structure formed by a plurality of interconnected engine cases; a fuel containment structure outboard of and connected to the engine housing structure, the fuel containment structure including a first endwall, a second endwall and a sidewall extending between the first endwall and the second endwall, the first endwall mechanically fastened to a first of the plurality of interconnected engine cases, and the second endwall mechanically fastened to a second of the plurality of interconnected engine cases; a fuel containment plenum formed by and located between the fuel containment structure and the engine housing structure; and a fuel delivery system including a plurality of fuel injectors, a fuel supply line and a fuel manifold fluidly coupling the fuel supply line to the plurality of fuel injectors, the fuel manifold and a connection between the fuel manifold and the fuel supply line arranged within the fuel containment plenum. ### Claim 2 (depends on 1) The engine system of claim 1, wherein a connection between the fuel manifold and each of the plurality of fuel injectors is arranged within the fuel containment plenum. ### Claim 3 (depends on 1) The engine system of claim 1, wherein the fuel delivery system further includes a flow regulator configured to regulate fuel flow to the plurality of fuel injectors; and the flow regulator is arranged within the fuel containment plenum. ### Claim 4 (depends on 1) The engine system of claim 1, wherein the fuel manifold includes a plurality of manifold lines and a plurality of manifold fittings interconnecting the plurality of manifold lines; and the plurality of manifold lines and the plurality of manifold fittings are arranged within the fuel containment plenum. ### Claim 5 (depends on 1) The engine system of claim 1, wherein the engine housing structure is between and fluidly separates the fuel containment plenum from the flowpath. ### Claim 6 (depends on 1) The engine system of claim 1, further comprising: an aircraft structure; the engine core housed in the aircraft structure; and the fuel containment structure between and fluidly separating the fuel containment plenum from a compartment volume within the aircraft structure and extending about the engine core. ### Claim 7 (depends on 1) The engine system of claim 1, wherein the fuel containment structure circumscribes the engine core. ### Claim 8 (depends on 1) The engine system of claim 1, wherein the fuel containment structure includes an arcuate first segment and an arcuate second segment; and the arcuate second segment circumferentially engages and is mechanically fastened to the arcuate first segment. ### Claim 9 (depends on 1) The engine system of claim 1, wherein the fuel containment structure is mechanically fastened to a flange of the engine housing structure. ### Claim 10 (depends on 1) The engine system of claim 1, wherein the fuel containment structure completely axially overlaps the plurality of interconnected engine cases. ### Claim 11 (depends on 1) The engine system of claim 1, wherein the fuel containment structure axially overlaps at least one of the plurality of interconnected engine cases. ### Claim 12 (depends on 1) The engine system of claim 1, wherein the fuel containment plenum is formed by and is axially between the first endwall and the second endwall; and the fuel containment plenum is formed by and is radially between the engine housing structure and the sidewall. ### Claim 13 (depends on 1) The engine system of claim 1, wherein the sidewall extends between and is formed integral with the first endwall and the second endwall. ### Claim 14 (canceled) ### Claim 15 (depends on 1) The engine system of claim 1, wherein the sidewall includes a first segment and a second segment arranged axially along the engine housing structure, and the first segment mechanically fastened to the second segment. ### Claim 16 (depends on 1) The engine system of claim 1, wherein the sidewall includes a first segment and a second segment arranged axially along the engine housing structure, and the first segment meets the second segment at a sealed interface. ### Claim 17 (depends on 1) The engine system of claim 1, wherein the fuel delivery system further includes a hydrogen fuel reservoir arranged outside of the fuel containment plenum; and the fuel supply line fluidly couples the hydrogen fuel reservoir to the fuel manifold. ### Claim 18 (depends on 1) The engine system of claim 1, further comprising a fuel purge circuit configured to purge fuel, which is leaked into the fuel containment plenum from the fuel delivery system, out of the fuel containment plenum and vent the leaked fuel to an external environment. ### Claim 19 An engine system, comprising: an engine core including a flowpath, a compressor section, a combustor section, a turbine section and an engine case, the flowpath extending through the compressor section, the combustor section and the turbine section from an inlet into the flowpath to an exhaust from the flowpath, and the engine case housing at least a portion of the combustor section; a fuel containment structure including a first endwall, a second endwall and a sidewall extending axially along the engine case between the first endwall and the second endwall, the first endwall projecting radially inward from the sidewall to the engine case, the first endwall mechanically fastened to the engine case, and the second endwall projecting radially inward from the sidewall to the engine case; a fuel containment plenum formed by and extending between the first endwall and the second endwall, and the fuel containment plenum formed by and extending between the engine case and the sidewall; and a fuel delivery system configured to direct fuel into a combustion chamber within the combustor section, the fuel delivery system comprising a plurality of components arranged within the fuel containment plenum. ### Claim 20 An engine system, comprising: an engine core including a flowpath, a compressor section, a combustor section, a turbine section and an engine case, the flowpath extending through the compressor section, the combustor section and the turbine section from an inlet into the flowpath to an exhaust from the flowpath, and the engine case housing at least a portion of the combustor section; a fuel containment structure radially outboard of and circumscribing the engine case, the fuel containment structure including a first endwall, a second endwall and a sidewall extending axially along the engine case between the first endwall and the second endwall, the first endwall mechanically fastened to the engine case, and the second endwall mechanically fastened to the engine case; a fuel containment plenum formed by and located radially between the engine case and the fuel containment structure; and a fuel delivery system including a plurality of fuel injectors, a fuel supply line and a fuel manifold fluidly coupling the fuel supply line to the plurality of fuel injectors, the fuel manifold arranged within the fuel containment plenum. ### Claim 21 (depends on 1) The engine system of claim 1, wherein the fuel containment structure is radially outboard of and circumscribes the combustor section.