# US 2022/0099253 A1 · Gas storage system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2022/0099253 A1 - Document ID: US20220099253A1 - Status: Published application - Kind: A1 - Application number: 17/426,783 - Filed: 2020-02-05 - Published: 2022-03-31 - Earliest claimed: 2019-02-06 - Assignees: Sllp 134 Limited - Applicants: Sllp 134 Limited - Inventors: Malcolm Bowie - Web page: https://patentgrep.com/patent/US20220099253A1 ## CPC - F17C 1/007: {Underground or underwater storage} - F17C 13/082: {for large sea-borne storage vessels (load-accommodating arrangements for ships or waterborne vessels B63B25/12)} - F17C 2201/0138: tubular - F17C 2201/032: with substantially vertical main axis - F17C 2201/035: with substantially horizontal main axis - F17C 2201/037: with sloping main axis - F17C 2201/052: large (>1000 m3) - F17C 2201/054: medium (>1 m3) - F17C 2203/0607: Coatings - F17C 2203/0617: with one layer - F17C 2203/0619: with two layers - F17C 2203/0639: Steels - F17C 2203/0663: in form of fibers or filaments - F17C 2205/0107: Frames - F17C 2205/0111: Boxes - F17C 2205/0142: bundled in parallel - F17C 2205/0184: Attachments to the ground, e.g. mooring or anchoring - F17C 2221/012: Hydrogen - F17C 2221/013: Carbon dioxide - F17C 2223/0123: gaseous, e.g. CNG, GNC - F17C 2223/036: Very high pressure (>80 bar) - F17C 2227/0192: by using a working fluid - F17C 2260/015: Facilitating maintenance - F17C 2270/0115: immerged - F17C 2270/0128: Storage in depth - Y02E 60/32: Hydrogen storage - F17C: VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES (storing fluids in natural or artificial cavities or chambers in the earth B65G5/00; construction or assembling of bulk storage containers employing civil-engineering techniques E04H7/00; variable-capacity gas-holders F17B; liquefaction or refrigeration machines, plants, or systems F25) - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION ## Abstract A portable subsea storage tank for the storage of gas products under pressure or oil products consisting of pipeline sections in an array which can be coated in specialist coatings and recovered for inspection and re-use. A method of self-installing the subsea storage tank is also described. ## Claims ### Claim 1 A portable subsea storage tank for the storage of gas products under pressure or oil products comprising: an array of pipe members, the pipe members connected together and configured to contain a fluid for storage; a framework to hold the pipe members in the array; a hull supporting the framework and providing transportation of the storage tank to and from a quayside to a location on the seabed and subsequent re-use at different locations; ballast capacity to control the descent/ascent of the storage tank; and an anchoring arrangement to hold the storage tank in position to the seabed. ### Claim 2 (depends on 1) The portable subsea storage tank according to claim 1 wherein the pipe members are formed from a plurality of pipe sections which are connected by at least one pipe bend of minimum 60°. ### Claim 3 (depends on 2) The portable subsea storage tank according to claim 2 wherein the plurality of pipe sections are connected together as a continuous long section comprising of multiple turns to form a total length of at least double that of a length of the storage tank. ### Claim 4 (depends on 2) The portable subsea storage tank according to claim 2 wherein the plurality of pipe sections are connected one to another with a conduit, the conduit having a smaller diameter than the pipe sections. ### Claim 5 (depends on 1) The portable subsea storage tank according to claim 1 wherein the framework includes connection means for installation of a pig launcher at a first location on the array and a pig receiver at a second location on the array to allow pipeline inspection, cleaning and flushing activities to be performed. ### Claim 6 (depends on 2) The portable subsea storage tank according to claim 2 wherein one or more of the pipe sections include separate internal storage cylinders of at least one non-metallic high strength material to contain gas under high pressure. ### Claim 7 (depends on 1) The portable subsea storage tank according to claim 1 wherein the portable subsea storage tank includes a pipework manifold comprising a plurality of valves to control the distribution of the fluid through the array. ### Claim 8 (depends on 1) The portable subsea storage tank according to claim 1 wherein a plurality of dynamic risers are attached to the storage tank to allow the passage of fluids and an umbilical to provide command and control to mechanical and electrical systems on the framework. ### Claim 9 (depends on 2) The portable subsea storage tank according to claim 2 wherein the pipe sections are heavy walled pipe sections, sufficient to avoid floating in seawater when empty. ### Claim 10 (depends on 2) The A portable subsea storage tank according to claim 2 wherein the pipe sections have an outside diameter between 0.30 m to 1.5 m. ### Claim 11 (depends on 10) The portable subsea storage tank according to claim 10 wherein the pipe sections have an outside diameter between 30″ to 40″ (0.762 m to 1.016 m). ### Claim 12 (depends on 1) The portable subsea storage tank according to claim 1 wherein the array is 10 m to 250 m in length along parallel arranged pipe members. ### Claim 13 (depends on 1) The portable subsea storage tank according to claim 1 wherein the pipe members are arranged side by side and on top of each other to provide a three dimensional array. ### Claim 14 (canceled) ### Claim 15 (canceled) ### Claim 16 (canceled) ### Claim 17 (canceled) ### Claim 18 (canceled) ### Claim 19 (depends on 1) The portable subsea storage tank according to claim 1 wherein the anchoring arrangement is selected from a group comprising: suction anchors, driven piles, drilled piles, ballast weight and mooring lines. ### Claim 20 A method of self-installing a portable subsea storage tank comprising the steps of: (a) providing a portable subsea storage tank comprising: an array of pipe members, the pipe members connected together and configured to contain a fluid for storage; a framework to hold the pipe members in the array; a hull supporting the framework and providing transportation of the storage tank to and from a quayside to a location on the seabed and subsequent re-use at different locations; ballast capacity to control the descent/ascent of the storage tank; and an anchoring arrangement to hold the storage tank in position to the seabed; (b) floating and towing the portable subsea storage tank to a desired location; (c) adjusting ballast capacity on the subsea storage tank to thereby submerge the subsea storage tank; (d) anchor the subsea storage tank to the seabed; and (e) introducing a fluid into the pipe members of the subsea storage tank to store the fluid. ### Claim 21 (canceled) ### Claim 22 (depends on 20) The method of self-installing a portable subsea storage tank according to claim 20 wherein the method includes the steps of adjusting the ballast capacity to re-float the storage tank and towing the storage tank to a further location. ### Claim 23 (depends on 20) The method of self-installing a portable subsea storage tank according to claim 20 wherein the method includes the step of inspecting the pipe members by using a pipeline pig. ### Claim 24 (depends on 20) The method of self-installing a portable subsea storage tank according to claim 20 wherein the gas is hydrogen under pressure produced from renewable sources. ### Claim 25 (depends on 20) The method of self-installing a portable subsea storage tank according to claim 20 wherein the gas is carbon dioxide under pressure and the method includes the step of injecting the gas into sub-surface reservoirs. ### Claim 26 (depends on 20) The method of self-installing a portable subsea storage tank according to claim 20 wherein the method includes the step of offloading stored fluids to a transportation vessel via exchange of fluids to maintain the gas under the same pressure when moving from the tank to the transportation vessel.