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BCGA issue revision to TIS 22 - Connecting gas cylinders


Gas cylinder shells are manufactured with an open end. To allow a gas to be contained under pressure within the cylinder shell a valve is fitted into the open end. The valve may have several functions, including:

  • A means of closing an opening in a cylinder shell.

  • Providing an inlet port to allow a cylinder to be filled by the gas supplier.

  • Providing closure to contain the gas contents within the cylinder.

  • Providing an outlet port to allow the gas to be released.

  • Providing a mounting and connection point for external components, such as regulators, safety devices, pipes, hoses, etc.

Each gas has distinct properties, before using or handling a gas it is important to understand the properties of that specific gas. Information on the gas contained inside a cylinder will be displayed on the cylinder product label. The gas supplier can provide a safety data sheet, as well as advice on safe use.


When a cylinder is initially received from the gas supplier, typically, the valve outlet will be protected by a cover, for example, a plastic cap, seal wrapped, etc. In this condition the outlet should be in a clean state and ready for use.


Before connecting a gas cylinder, a check should be carried out to ensure it contains the correct gas for the application, the valve outlet is in a good mechanical condition and it is free from contamination. Equally, the downstream pressure system or equipment should be checked to ensure it is in a good condition, is suitable for the supply gas and pressure, will not cause damage to the cylinder valve or be a source of contamination.


This information sheet covers:

  • hazards

  • safe use

  • warnings

  • connection procedure.

It is available here.


British Compressed Gases Association November 2021



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