Confined Space Entry and Changing Conditions
An Entry Permit Cannot Hold the Atmosphere Still
A confined space may test safe before entry and change when work disturbs residue, ventilation stops, a connected line leaks or a nearby activity introduces fumes. Entry must follow a site-specific assessment and authorised procedure, with hazards isolated, atmospheric conditions tested and monitored as required, and a ready means to summon and perform rescue. A signed permit is a record of controlled conditions, not a guarantee that they will remain unchanged.
Controls to confirm
- Identify whether the space requires a permit and verify isolation of connected energy, materials and moving equipment; confirm the authorised work scope, entrant, attendant and entry supervisor roles before entry.
- Test the atmosphere with suitable equipment in the required sequence and locations before entry; provide the ventilation and continued monitoring specified by the assessment, including an immediate response to alarms or lost ventilation.
- Maintain communication, entry and exit accountability, an attendant outside and an effective rescue arrangement; evacuate and cancel or reassess entry whenever conditions depart from the permit.
Today’s action
Review one planned confined-space entry today and verify that monitoring, attendant communication and rescue arrangements are ready before entry begins.
Source guidance
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