CGA580

Height, diameter and empty weight for this cylinder are listed in the specifications on this page. As a class, 125 cubic feet is a shop-scale bottle: movable by one person with a cart, but not a carry-by-hand size when full. Check the listed height if it must fit under a bench or inside a cabinet.

It means the cylinder is manufactured to a United States Department of Transportation specification and carries that specification, along with its serial number and test date, stamped into the collar. Gas suppliers read those stamps before filling. A cylinder without valid DOT markings and a current test date will not be filled.

It ships with a cap and collar and a CGA580 inert gas valve already installed, so nothing further is needed before a first fill beyond a matching regulator. The cap protects the valve in transit and storage and should be refitted whenever the regulator is off. It does not include gas.

Any nitrogen or inert-gas regulator with a CGA580 inlet threads on directly. For HVAC pressure testing choose a high-pressure nitrogen regulator that reaches your required test pressure; for welding or dispensing, a flowmeter-style regulator is more usual. Confirm the inlet is CGA580 and not CGA320, which is CO2.

Common uses are HVAC pressure testing and purging, brazing purge, laboratory and industrial nitrogen supply, tire inflation where dry gas is wanted, and beverage applications such as nitro coffee. The 125 cubic foot size suits steady or repeated use where a smaller bottle would need constant refilling. Dry nitrogen is chosen because it displaces oxygen and moisture.

It depends entirely on the draw. Intermittent HVAC pressure tests use very little per test, so this size can cover a great many jobs, while continuous purging or a steady beverage draw depletes it much faster. Watch the regulator gauge and refill before it nears empty.

Yes. “Tank”, “cylinder” and “bottle” are used interchangeably for a steel vessel holding compressed nitrogen, and search results differ mainly by which word the buyer typed. This is a 125 cubic foot nitrogen cylinder with a CGA580 connection whichever term your supplier uses.

No. All cylinders ship empty for transport safety and must be filled before use. Any welding or industrial gas supplier can fill it to the marked service pressure. Specify a purity grade if your application requires one, since some laboratory and food uses do.

The CGA580 connection is shared across inert gases, and suppliers do fill inert-service cylinders with argon, nitrogen or helium. Confirm with your filler before changing a cylinder’s gas service, as some keep cylinders dedicated to one gas and purity requirements differ.

The 60 cu ft is the mid-portable size, the 300 cu ft is a full-height fixed shop bottle, and the 125 cu ft sits between them as the common working size. All three share the CGA580 connection, so one regulator serves any of them. Choose on refill frequency against how far the bottle has to move.

You own it outright, with no rental contract and no recurring fees. Ownership lets you refill or exchange at any qualified supplier instead of being tied to one vendor, and at this size the saving against rental builds quickly. Keep the purchase record and the collar date.

High-pressure steel cylinders are requalified on a set DOT interval, with the last test date stamped into the collar. Suppliers check that date at every fill and will refuse an out-of-date cylinder. Buying new starts the interval fresh, so the next test is years away.

Store and use it upright, chained or strapped so it cannot fall, with the cap fitted whenever the regulator is off. High-pressure cylinders are dangerous if the valve is sheared by a fall. Keep it out of direct heat and move it on a cart rather than walking it on its base.