The danger is not always visible

Superheated steam can be invisible close to a leak. A visible plume does not necessarily mark the full hazardous area. Never search for escaping steam by approaching with a hand, or walk through a suspected leak area to identify its source.

Hot surfaces, valves and liquids can also cause burns. A major rupture may rapidly fill a room and compromise escape. Assessment must include operators, maintenance workers and other people whose routes pass beside the installation, even if they never touch its controls.

Condensate and water hammer

Condensate is water formed as steam gives up heat. If it accumulates where it should not, it can contribute to water hammer: dynamic events capable of imposing severe loads on pipework and components. These events are not simply normal operating noises to be accepted.

Drainage design and steam-trap condition matter. Bringing cold sections into service requires particular attention. An operator should not attempt to resolve banging, vibration or abnormal behaviour by improvising valve movements without the system-specific procedure and authority to act.

Integrity of the complete installation

Supports, expansion joints and alignment affect pipe stresses. They must remain within the manufacturer’s intended conditions. Thermal insulation must allow necessary inspections; hiding a component does not prevent deterioration or establish that it is in good condition.

Maintenance must address identified abnormalities and changes of use. Altering pipework or supports can change thermal movement and stress distribution. Pressure equipment require inspection appropriate to their duty and applicable requirements, including components that may otherwise receive little attention during routine operation.

Planned operation and response

Training must explain the actual system, warning signs and authorised actions. Starting, stopping and maintenance require technical procedures. Lockout/Tagout (LOTO) must address pressure, temperature and feeds from elsewhere in the network, rather than electricity alone.

For a suspected leak, restrict access and activate the planned response from a safe position. Returning the installation to service requires assessing the cause, carrying out repairs and verifying conditions. Investigated ship incidents illustrate the potential severity, but do not replace assessment of each industrial installation and its escape arrangements.