| F | SK | MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING |
| F17 | KL | STORING OR DISTRIBUTING GASES OR LIQUIDS (water supply E03B) |
| F17C | UKL | 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 B65G 5/00; construction or assembling of bulk storage containers employing civil-engineering techniques E04H 7/00; variable-capacity gas-holders F17B; liquefaction or refrigeration machines, plants, or systems F25) |
| F17C 1/00 | HGR | Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge (pressurised apparatus for purposes other than storage, see the relevant subclasses such as A62C , B05B; associated with vehicles, see the appropriate subclass of classes B60 to B64; pressure vessels in general F16J 12/00) |
| F17C 1/02 | UGR1 | | . | involving reinforcing arrangements [4] |
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| F17C 1/04 | UGR2 | |
| F17C 1/06 | UGR3 | | . . . | built-up from wound-on bands or filamentary material, e.g. wires [4] |
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| F17C 1/08 | UGR2 | | . . | Integral reinforcements, e.g. ribs |
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| F17C 1/10 | UGR1 | | . | with provision for protection against corrosion, e.g. due to gaseous acid (inhibiting corrosion of metallic material or incrustation in general C23F) [4] |
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| F17C 1/12 | UGR1 | | . | with provision for thermal insulation (thermal insulation in general F16L 59/00) [4] |
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| F17C 1/14 | UGR1 | | . | constructed of aluminium; constructed of non-magnetic steel |
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| F17C 1/16 | UGR1 | | . | constructed of plastics materials |
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| F17C 3/00 | HGR | Vessels not under pressure |
| F17C 3/02 | UGR1 | | . | with provision for thermal insulation (thermal insulation in general F16L 59/00) |
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| F17C 3/04 | UGR2 | | . . | by insulating layers (F17C 3/08 takes precedence) |
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| F17C 3/06 | UGR3 | | . . . | on the inner surface, i.e. in contact with the stored fluid [4] |
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| F17C 3/08 | UGR2 | | . . | by vacuum spaces, e.g. Dewar flask (for household use A47J 41/02) |
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| F17C 3/10 | UGR2 | | . . | by liquid-circulating or vapour-circulating jackets |
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| F17C 3/12 | UGR1 | | . | with provision for protection against corrosion, e.g. due to gaseous acid (protection against corrosion in general C23F) |
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| F17C 5/00 | HGR | Methods or apparatus for filling pressure vessels with liquefied, solidified, or compressed gases (adding propellants to aerosol containers B65B 31/00) |
| F17C 5/02 | UGR1 | | . | for filling with liquefied gases |
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| F17C 5/04 | UGR2 | | . . | requiring the use of refrigeration, e.g. filling with helium or hydrogen |
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| F17C 5/06 | UGR1 | | . | for filling with compressed gases |
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| F17C 6/00 | HGR | Methods or apparatus for filling vessels not under pressure with liquefied or solidified gases [3] |
| F17C 7/00 | HGR | Methods or apparatus for discharging liquefied, solidified, or compressed gases from pressure vessels, not covered by another subclass |
| F17C 7/02 | UGR1 | | . | Discharging liquefied gases |
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| F17C 7/04 | UGR2 | | . . | with change of state, e.g. vaporisation [3] |
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| F17C 9/00 | HGR | Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure |
| F17C 9/02 | UGR1 | | . | with change of state, e.g. vaporisation |
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| F17C 9/04 | UGR2 | | . . | Recovery of thermal energy [3] |
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| F17C 11/00 | HGR | Use of gas-solvents or gas-sorbents in vessels |
| F17C 13/00 | HGR | Details of vessels or of the filling or discharging of vessels |
| F17C 13/02 | UGR1 | | . | Special adaptations of indicating, measuring, or monitoring equipment (measuring in general G01) |
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| F17C 13/04 | UGR1 | | . | Arrangement or mounting of valves (valves per se F16K) |
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| F17C 13/06 | UGR1 | | . | Closures, e.g. cap, breakable member (closures for containers in general B65D) |
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| F17C 13/08 | UGR1 | | . | Mounting arrangements for vessels |
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| F17C 13/10 | UGR1 | | . | Arrangements for preventing freezing |
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| F17C 13/12 | UGR1 | | . | Arrangements or mounting of devices for preventing or minimising the effect of explosion (flame traps A62C 4/00) |
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