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Empty Oxygen Cylinder: Refillable, Reusable

It’s awe-striking how human biological system functions in a set of processes, like subconsciously breathing, enzymes processing and tissue repairing, for our longer run. We breathe in Oxygen (O2) from the earth’s atmosphere which is comprised of 21% oxygen, 78.08% nitrogen (N), 0.93% argon, 0.04% carbon dioxide (CO2) and traces of other noble gases.

In addition, the nature is unexplainable and its functioning is impeccable. Though atmospheric air is the natural source of O2, there are several situations during which supplemental oxygen is required – be it industrial processing or medical needs to boost oxygen level in human body for survival.

To satisfy these needs of applications, Oxygen Plants, Oxygen Concentrators and Portable Oxygen Cylinders are used. And, to protect our planet Earth these containers have been made refillable to enable reuse feature. This implies that you can refill your Empty Oxygen Cylinder at the time of emergency. Tradeindia provide different types of these empty O2 cylinders depending upon the requirements.

Structure Specifications

An Empty Oxygen Cylinder is a circular-cylindrical and highly-pressurized container that is manufactured from hot forged, seamless metal. This portable cylinder provides you the freedom to move around as the need. The filled O2 cylinders have maximum pressure of 3000 PSI.

Traditionally, the gas cylinders were constructed of low carbon steel. In modern times, they are constructed of aluminum, lightweight steel, chrome molybdenum steel or a composite. The wall thickness of the steel container is 3 mm than that of an aluminum alloy with 6 mm2.

For composite construction, there are two options i.e., aluminum wrapped in carbon fiber, glass fiber, Keval or others, or encased within a high-density polyethylene (HDPE) jacket. The composite cylinders are widely used by paramedics, emergency first responders, and firefighters.

Formation of O2 Cylinders

Cast billets – small spherical-shaped metal (for instance, aluminum material), is melted and processed. The molten aluminum is placed inside a die (a cylindrical-shaped hollow structure) and the press force is applied against the structure. The general shape of seamless cylinder is given and finished.

Afterwards, the casted aluminum cylinder is cooled down using respective industrial cooling equipment. The product is verified and inspected for any defects in order to comply with international and national quality standards.

The cylinder is then processed through double thermal treatments. In the first process called ‘heat treat’, the cylinder is placed in a furnace and heated to about 1,000°F (538°C) and labeled it as ‘T-4 temper’. In the second thermal process called artificial ageing, the cylinder is heated to 350°F (177°C) that enables the alloying elements of aluminum to precipitate out of the mixture and into the grain boundaries and thus, strengthening the container. Now, the container is labeled as ‘T-6 temper’.

For the neck configuration, the o-ring gland, top surface and the threads are machined into the cylinder using a form tool. An automatic milling machine, controlled by Computer-Aided Design (CAD) software, is used.

Then, the cylinder is subjected to multiple quality and strength tests, like corrosion test, impact resistance test, hydrostatic test, ageing test and others. It is again inspected and verified according to the global quality standards. This is how an Empty Oxygen Cylinder is manufactured in a hygienic and economical way.


An Empty Oxygen Cylinder comes in different sizes and pressure capacity, depending on the application. They are light in weight, durable in nature, resistant to corrosion, rust and environmental impacts. Nonetheless, they are non-magnetic, easy to handle and refillable. Refilling process is undertaken by respective store.

Depending on the size, the O2 storage capacity of the container varies from 270 liters up to 1500 liters. It stores the pressurized gas at a standard pressure of 2000 PSI. In respect to this, the gas filling pressure also varies like 150 kg/cm. It is refillable with a high-pressure of up to 4000 kPa.

An Empty Oxygen Cylinder, used in medical center and homes, delivers O2 gas to the users via oxygen mask or nasal cannula, or built in breathing system (BIBS). Although it is durable in nature, it requires thorough inspection & pressure test to ensure its structural & functional stability.

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