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  2. Permit-to-work - Wikipedia

    en.wikipedia.org/wiki/Permit-to-work

    Permit-to-work adherence is essential in process safety management. Examples of high-risk jobs where a written permit-to-work procedure may need to be used include hot work (such as welding), confined space entry , cutting into pipes carrying hazardous substances (breaking containment), diving in the vicinity of intake openings, and work that ...

  3. Confined space - Wikipedia

    en.wikipedia.org/wiki/Confined_space

    A confined space is a space with limited entry and egress and not suitable for human inhabitants. Alternative names for a confined space are enclosed space and dangerous space. [ 1 ] An example is the interior of a storage tank , occasionally entered by maintenance workers but not intended for human occupancy.

  4. List of diving environments by type - Wikipedia

    en.wikipedia.org/wiki/List_of_diving...

    An overhead or penetration diving environment is where the diver enters a space from which there is no direct, purely vertical ascent to the safety of breathable atmosphere at the surface. Cave diving , wreck diving , ice diving and diving inside or under other natural or artificial underwater structures or enclosures are examples.

  5. Confined space rescue - Wikipedia

    en.wikipedia.org/wiki/Confined_space_rescue

    Confined space rescue is a subset of technical rescue operations that involves the rescue and recovery of victims trapped in a confined space or in a place only accessible through confined spaces, such as underground vaults, storage silos, storage tanks, or sewers. A warning label on a storage tank, indicating that it is a confined space.

  6. Physical hazard - Wikipedia

    en.wikipedia.org/wiki/Physical_hazard

    Confined spaces also present a work hazard. The National Institute for Occupational Safety and Health (NIOSH) defines "confined space" as having limited openings for entry and exit and unfavorable natural ventilation, and which is not intended for continuous employee occupancy.

  7. Underwater diving environment - Wikipedia

    en.wikipedia.org/wiki/Underwater_diving_environment

    Most confined space diving environments are under an overhead. Overhead environments include work under ships and other structures, culverts, inside industrial installations, drains, sewers, penstocks and similar installations, as well as the better known cave, cavern, and wreck diving environments. The restriction on direct ascent increases ...

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