Carbon Dioxide Cylinder
Carbon dioxide cylinderThe carbon dioxide (CO2) cylinder is one of the most widely used storage systems for compressed and liquefied gases in various industries. Bonyan Gas supplies these cylinders in a range of capacities (from 2 and 5 liter portable to 40 and 50 liter industrial) with seamless steel and aluminum bodies. All cylinders are made to the international standard ISO 9809-1 and are an ideal solution for factories, petrochemical plants, welding workshops (MIG/MAG) and the food industry.
These products are supplied with a guarantee of physical soundness and a valid periodic hydrostatic test certificate, so that industrial buyers and tender participants can purchase with full confidence in the highest level of safety.
Free hydrostatic test Supply options: purchase, refill or exchange
Cylinder with gas, ready for delivery
You have a cylinder and only need gas
Without gas, to be filled by the buyer
Specifications Table
| Cylinder volume | Working pressure | Test pressure | Diameter | Weight | Height | Valve type | Valve thread direction | Supply condition | Refillable | Country of manufacture |
|---|---|---|---|---|---|---|---|---|---|---|
| 10 L | 150 bar | 250 bar | 140mm | 13.6kg | 840mm | DIN 477 No. 6, equivalent to BS 341 No. 8 (thread W21.8×1/14) | Right-hand thread | New and sealed | Yes | China |
| 20 L | 150 bar | 250 bar | 32mm | 29kg | 85mm | DIN 477 No. 6, equivalent to BS 341 No. 8 (thread W21.8×1/14) | Right-hand thread | New and sealed | Yes | China |
| 40 L | 150 bar | 250 bar | 219mm | 50kg | 1350mm | DIN 477 No. 6, equivalent to BS 341 No. 8 (thread W21.8×1/14) | Right-hand thread | New and sealed | Yes | China |
| 50 L | 200 bar | 300 bar | 232mm | 56-58kg | 1520mm | DIN 477 No. 6, equivalent to BS 341 No. 8 (thread W21.8×1/14) | Right-hand thread | New and sealed | Yes | China |
| 50 L | 200 bar | 300 bar | 232mm | 56-58kg | 1520mm | DIN 477 No. 6, equivalent to BS 341 No. 8 (thread W21.8×1/14) | Right-hand thread | New and sealed | Yes | China |
Under international protocols, standard industrial carbon dioxide cylinders are painted gray; however, cylinders for fire suppression systems must be red so they can be identified quickly in emergencies.
All CO2 cylinders from Bonyan Gas are delivered with a protective metal cap on the valve to prevent damage to the fittings during transport, handling and storage; we strongly recommend not removing this safety cap until the regulator or pressure gauge is fitted.
Ordering, refilling and delivery
We have designed our carbon dioxide supply chain so that your workshop and industrial processes run without a second’s interruption. Customers can choose and order new cylinders, full or empty, from the top of this page according to their needs.
To save time, a cylinder exchange system (Fast Swap) is also available: hand over an empty cylinder and immediately receive a full, tested one. In addition, factories and high-consumption industrial sites can arrange periodic, batch-by-batch supply to avoid interruptions in their production lines.
For the gas grades available in the cylinder, see: buy carbon dioxide gas ↗
Guide to choosing a CO2 cylinder volume
The higher the consumption, the more a larger volume reduces how often you refill or exchange. For frequent handling (such as small workshops), smaller sizes are better.
Standard
Fire-fighting / siphon type
50 L fire-fighting cylinder: technical difference from the industrial type
The gas in both types of 50-liter cylinder is the same (CO2 of the same purity grade). The main difference is the internal structure: the fire-fighting type has a siphon tube (dip tube) that draws CO2 as a liquid from the bottom of the cylinder, while a standard industrial cylinder releases gas from the top. This feature is exactly what is needed to refill fixed CO2 fire suppression systems (common in transformer rooms, server rooms and high-risk petrochemical units) and to refill hand-held fire extinguishers. If your cylinder is for feeding or refilling a fire suppression system, you should order the siphon type; otherwise, the standard industrial type is enough for drawing gas.
Cylinder volume, type (standard or fire-fighting with siphon), condition (full/empty) and market conditions are the main price factors.
The refilling cost depends on cylinder volume and application (welding, industrial, food). For an exact, up-to-date price, contact our sales experts.
The right volume depends on consumption, storage space and how often the cylinder must be moved or refilled. For continuous industrial use, 40 or 50 liters is best; for low consumption and frequent handling, 10 liters is better.
The right capacity depends on consumption, storage space and how often the cylinder needs to be moved.
In this industry, the direction of the valve thread is a global safety rule: valves for flammable gases (such as hydrogen or acetylene) are always left-hand, and valves for non-flammable or oxidizing gases (such as oxygen, argon, nitrogen and CO2) are always right-hand, making it impossible to connect a regulator to the wrong gas. The exact outlet thread of a CO2 valve in Europe and most world markets, including Iran, follows DIN 477 No. 6 (equivalent to BS 341 No. 8); the CO2 regulator must be made for this standard. The 50-liter fire-fighting cylinder uses the same valve family, except that it has an internal siphon tube.
The working pressure of 200 bar and the hydrostatic test pressure of 300 bar are the design and rating pressures of the steel cylinder body itself, i.e. the maximum pressure the cylinder structure has been tested and approved for. This differs from the actual pressure of the gas in a full cylinder: because CO2 is stored as a liquid in the cylinder at room temperature, its actual pressure at 20°C is usually 50 to 65 bar and rises and falls with temperature. The cylinder is built with a very high safety margin relative to the actual pressure of its contents.
The fire-fighting type has a siphon tube and draws liquid CO2 from the bottom of the cylinder; this is needed to refill fixed CO2 fire suppression systems and fire extinguishers. If you need gas for ordinary industrial use, the standard type is enough.