A gas cylinder is an industrial tank used to store gases under pressure. They are usually tall and narrow and can hold a variety of gases, including oxygen, helium, propane, nitrogen, and compressed air. They are used in a wide range of facilities, including laboratories, manufacturing and industrial applications, medical buildings, and the construction industry.

A cylinder may be made of metal, fibre composite material, or a combination of both. Typically, there is a thin metal liner that keeps the cylinder tight and limits the working pressure. The cylinder also contains a valve for dispensing the gas, and this valve can have a gauge that tells users how much is left in the container.

Depending on the size and type of cylinder, manufacturers may require it to be inspected before it is used and then re-tested at regular intervals. These periodic inspections can help to prevent the risks associated with gas cylinders, and can often lead to the withdrawal of faulty cylinders.

Regulations for the use, storage, and transport of gas cylinders are often quite strict. These regulations are necessary because of the high level of risk and the chemical and fire hazards associated with gas under pressure.

The cylinder should be checked for leaks at least once a year. This can be done by using a snoop or soap solution to detect any signs of leaks. If the leaks are not detected, they can cause a fire or explosion that could threaten lives or property.

If a leak is found, the cylinder should be removed from use immediately. It should then be capped, which helps to seal the gas inside. Most cylinders are shipped with this cap so that they can be more easily transported.

Cylinders are regulated by a number of countries and they must be periodically inspected to ensure they meet the appropriate safety standards. These examinations can include an internal inspection with an endoscope and an external examination by a certified gas cylinder inspector.

Most cylinders have a valve at the top that dispenses the gas, and this can also have a gauge that shows how much is left in the container. The valve can be adjusted to release different amounts of the gas depending on the application, and this can also be used to control the flow rate of the gas.

When a cylinder is not in use, it must be capped and the valve can be replaced with a pressure-regulating assembly. This attachment usually has upstream and downstream pressure gauges, as well as a needle valve and outlet connection.

A cylinder with a regulator must be moved and used under conditions that will ensure that it remains intact, and this must be done with the assistance of someone who is familiar with how to operate it correctly. The valve must be opened slowly and firmly, and the regulator should be removed before moving the cylinder or when work is completed.

During storage, the cylinder must be kept away from areas where there is the potential for the cylinder to be damaged by impact. This can include elevators, gangways, and other locations where heavy objects could strike or fall on the cylinder.