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Confined Space & Rescue

Confined Space & Rescue

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A confined space is one which is both enclosed or, largely enclosed, and which also has a reasonably foreseeable risk to workers of fire, explosion, loss of consciousness, asphyxiation or drowning. It may be small and restrictive for the worker or it could be far larger such as a grain storage silo with hundreds of cubic metre capacity.

What are the hazards?

Working in a confined space is dangerous because of the risks from noxious fumes, reduced oxygen levels, or a risk of fire. Other dangers may include flooding/drowning or asphyxiation from some other source such as dust, grain or other contaminant.

What do I have to do?

Wherever possible, you should avoid carrying out tasks in confined spaces. Where this is not possible, you must assess the risks of the particular confined space and plan how you will control those risks. For example:

  • if a confined space has noxious fumes, you should consider how these can be ventilated or removed
  • if there is a risk of liquids or gases flooding in, you should establish whether the valves can be locked shut
  • if someone is going into a confined space and there is not enough oxygen to breathe properly, you must provide breathing apparatus or ventilate the space to increase oxygen levels before entering

You should have emergency arrangements where necessary. If someone is working in a confined space, think about the following:

  • How will you know they are okay and haven’t been overcome by fumes?
  • How will you get them out if they are overcome? (It is not enough to rely on the emergency services.)

Dos and don’ts of working in confined spaces


  • be aware of the risks that may occur within a confined space
  • make sure the person doing the work is capable and trained in both the work and the use of any emergency equipment


  • work in confined spaces unless it’s essential to do so
  • ignore the risks – just because a confined space is safe one day doesn’t mean it will always be
  • let others enter a confined space until you are sure it’s safe to do so

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