A gas filling system converts stored cryogenic liquid into filled cylinders of compressed gas, prepared gas mixtures or dry ice. Cryofortune Engineer & Supply Co., Ltd. sources each stage of the chain from a network of Chinese manufacturers. The factory is selected per destination country, design standard and documentation requirement, and the stages are sized together as one duty.
What a filling station comprises
Most stations reduce to five functional blocks, whatever the gas. A liquid reserve holds the media. A pump raises it to filling pressure. A vaporizer converts liquid to gas where gas-phase filling is required. A filling manifold, or ramp, distributes flow to the cylinder connections. Controls and instrumentation supervise pressure, temperature and shut-off.
- Liquid reserve. A vertical cryogenic storage tank of 7,990–25,000 L gross volume and 0.8–2.2 MPa working pressure suits continuous filling duties. Lower-throughput sites can start from vertical cryogenic cylinders of 50–500 L gross volume with built-in pressure build-up.
- Pressure raising. Reciprocating filling pumps and pump skids handle liquid transfer and high-pressure cylinder filling; their ratings are set out in the core line below.
- Regasification. Ambient-air and heated vaporizers with capacities up to 500 m³/h supply the gas phase where gas filling is required.
- Manifolds and controls. Filling ramps, valve stations and instrumentation are configured as part of packaged supply, against cylinder count and connection type.
Filling cylinders from a liquid supply
The core line is short: tank, pump, vaporizer, manifold. A cryogenic cylinder filling pump takes liquid at 0.3–0.8 MPa inlet pressure and discharges at 16–25 MPa, at flow rates of 800–1,000 L/h with 7.5–11 kW motors, for LN2, LOX, LAr and liquid CO2. A high-pressure cryogenic vaporizer rated up to 200 bar working pressure converts the discharged liquid to gas ahead of the manifold. The gas then fills seamless high pressure gas cylinders of 5–50 L water capacity at working pressures of 150–300 bar, with the catalog line manufactured to ISO 9809-1; cylinder approval requirements are confirmed per destination market. Pump, vaporizer and cylinders are selected together against the target filling pressure — the figures above are per-model ranges, not a single guaranteed chain.
Pump selection is treated in how to choose a cryogenic cylinder filling pump, and vaporizer capacity in the vaporizer sizing guide. Both are sized against cylinders filled per shift rather than against nameplate maxima.
CO2 filling and outlet temperature
CO2 lines usually add a heating stage. After vaporization, a gas heater / CO2 heater stabilizes outlet gas temperature, with variants rated 2–25 MPa, 100–300 m³/h and 24–96 kW at 380 V. The CO2 filling station equipment setup article sets out a complete line stage by stage, from storage through heater to manifold.
Where gas mixtures are filled
Stations filling Ar+CO2, Ar+O2, Ar+He or N2+CO2 blends — welding shielding and food-packaging duties — insert a mixing stage between supply and manifold. A gas mixer with buffer tank delivers 50–300 m³/h at an adjustable 0.3–0.6 MPa outlet, with mixing accuracy of 0.5–1%. Where dosing, pressure regulation and operator monitoring are centralized, a gas mixing cabinet with PLC control takes the same duty at 100–300 m³/h. A standalone gas mixture buffer tank of 600 L or 2,000 L, rated 0.8 MPa, stabilizes line pressure downstream of the mixer.
Dry ice production as an adjacent station
Sites holding liquid CO2 often add a dry-ice line drawing from the same reserve. A dry ice pelletizer converts liquid CO2 into pellets of 3 mm or 16 mm at 40–50 kg/h from a 3 kW drive. Insulated dry ice storage containers of 33–350 L limit sublimation loss between production and dispatch.
Filling station layout, safety and standards
Filling stations attract closer regulatory attention than standalone storage. Cylinder-handling areas, venting, separation distances and electrical supply are governed by destination-country rules, and pressure-equipment codes may apply to individual vessels and pumps. Requirements differ by market and are confirmed per project; the standards hub outlines the main frameworks, and export certification covers the documentation that accompanies shipment.
Scoping a filling system
Five parameters fix most configurations: the media, cylinders filled per day, target filling pressure, any mixture requirement, and the site’s available power. The equipment-by-gas guide helps where the media itself is still being settled; storage sizing follows from the same daily-throughput figure and is fixed in the configuration proposal.
Send a rough duty description — media, cylinders per day, target filling pressure and destination country — and we will return a configuration proposal with a manufacturer matched to your market. Configurations and documentation are confirmed for the specific manufacturer, model and order before production.