Siphon vs Non-Siphon Gas Tanks
Which do you need?
Most applications use non-siphon tanks (gaseous CO₂). Siphon tanks are specialized for applications requiring liquid CO₂, such as food preservation and solvent extraction. If you're unsure, our team can help you choose the right tank for your needs.
What is a Siphon or Dip Tube?
A siphon, sometimes referred to as a dip tube, is like a straw, one normally made of either steel, stainless steel, or copper. There are two different types, with one being external, and another that goes inside and reaches the bottom of the tank. A straw inside of a gas cylinder is typically referred to as either a siphon or dip tube, though some may call it a liquid straw, depending on the region and industry.
CO2 cylinders and siphon tanks come in different materials, like aluminum and steel, and can be ordered in a variety of sizes. Its measurements are based on weight, typically from between 5lbs and 50lbs. The siphon is out of sight, staying inside the tank. Because of this, they both look the same on the outside.
To compensate for the visual similarities, a cylinder will be marked a certain color to identify whether it has a dip tube inside or not. The color itself may vary depending on the company and region.
Most gases are stored in their liquid state. That liquid gas gets sucked up to the valve, bringing its state of matter into its gaseous state out of the tank. Introduce a dip tube, and it will instead allow the flow of the gas to expel in its liquid state. Some people refer to them as liquid tanks or liquid cylinders for that reason.
Siphon vs Non-Siphon Comparison
| Feature | Siphon Tank | Non-Siphon Tank |
|---|---|---|
| Output State | Liquid CO₂ | Gaseous CO₂ |
| Internal Dip Tube | ||
| Visual Identification | Color marking | No special marking |
| Common Use Cases | Food preservation, extraction, refrigeration | Carbonation, balloon filling, special effects |
| Availability | Less common | Standard |
Besides the physical color marking and internal dip tube itself, a siphon tank will look exactly like a regular gas tank, but their applications vary greatly because of what the dip tube is designed to do.
Applications for Each Type
Now first off, siphon tanks are less commonplace compared to regular, siphonless tanks. Carbon dioxide tanks dedicated to carbonating water and soda, helium tanks blowing balloons, and propane tanks heating grills will not have internal siphons. Although, that doesn't mean gas tanks with dip tubes don't have a place or purpose.
There are specific jobs that will put liquid gases to good use, and that's where the siphon comes into play!
Food Preservation
Refrigerating and storing food for extended periods
Solvent Extraction
Extracting solvents using liquid CO₂ for clean separation
Special Effects
Theatrical fog and special effects (typically non-siphon)
Beverage Carbonation
Soda machines and beverage carbonation (non-siphon)
It plays a role in food preservation by refrigerating and storing food for extended periods of time. In some cases, it can aid in softening food too.
It also helps in extracting solvents. Many extraction systems use liquid CO2 because the gas has the ability to separate and dissolve certain substances, making the yield of separated solvents possible. Using liquid CO2 is the cleanest and quickest way to perform this task.
Siphon CO₂ Cylinder Safety Concerns
Important Safety Information
For the most part, yes, but the specifics vary for each gas cylinder. Carbon dioxide tanks are typically given the option of having an internal dip tube. Most other gases probably won't use that type, but will instead use an external siphon.
Ordering Siphon CO₂ Cylinders
When placing your order, be sure to specify whether you need a siphon or non-siphon tank. Our team can help you determine which type is right for your application.
Need help choosing?
Call us at 877-280-5321 and our team will help you select the right tank type for your specific needs.
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