Pressure is not the only hazard
A damaged cylinder or connection can release gas and energy dangerously. In addition, a flammable gas can ignite, an oxidising gas can promote combustion and a toxic gas can cause harm through inhalation.
A gas that does not burn is not necessarily harmless: it may displace oxygen in an enclosed space and create a hazardous atmosphere. The assessment must consider the gas, quantity, space, ventilation and people who may be exposed.
Identification and receipt
Identification must be based on markings and labels and checked against the safety data sheet and supplier information. Colour should not be the sole basis for deciding what a cylinder contains.
Receiving checks can detect damage, uncertain identification or non-compliant documentation and inspections. A cylinder showing abnormalities should not be put into use while assessment is sought from the supplier or competent responsible person.
Storage and cylinders in use
In Spain, ITC MIE APQ-5 of Royal Decree 656/2017 regulates storage and use of portable containers within its scope. It distinguishes storage areas from containers in use or essential reserve, to which Article 9 specifically applies.
Location, ventilation, separation and protection depend on hazards and quantities. No single distance is valid for every combination of gases. Safe access must be maintained and leaks prevented from affecting occupied areas or evacuation routes.
Movement and protection against damage
INSST Technical Prevention Note 397 highlights suitable handling equipment and securing cylinders against falls. It also warns against impacts that may compromise their strength or damage the valve.
Cylinders are not supports, rollers or improvised work equipment. Their protection during movement and use must correspond to the container design and supplier instructions. Handling requires appropriate training and resources.
Connections and compatibility
Regulators, seals, hoses and couplings must suit the gas and intended conditions. The fact that two parts can physically connect does not establish compatibility. Connections must not be forced, adapters improvised or valves repaired without specific competence and procedures.
Cleanliness also depends on the gas. Certain products, oils or greases may be incompatible. Selection and maintenance must follow the supplier’s technical instructions rather than extrapolating practices from another installation.
Organise the response to abnormalities
The company must define how to report damage or leaks, restrict access, notify responsible people and activate the appropriate emergency response. Personnel need to recognise when to leave the area and request specialist help.
A flame must not be used to search for a leak, nor should anyone enter an unknown atmosphere to attempt rescue or repair. Procedures must provide for intervention by trained personnel and coordination with the supplier, rather than relying on improvised decisions during the incident.
Hypothetical example: introducing a different gas
A laboratory receives a new gas in a cylinder resembling those normally used. Before connecting it, staff check identification, hazards, equipment compatibility and room conditions. The review finds that the available regulator is not validated for that use.
Connection is delayed until the appropriate combination and understandable instructions are available. External similarity of the container is not used as a criterion for accepting the operation.
