Dealing with Confined Space Entry - Gem Bayless

Confined spaces can be found in a wide variety of industries and applications and these environments can present an array of hazards for operators. As the name might suggest, a confined space is a location with a limited volume size and can be defined as having the following attributes:

• The space itself must be large enough for a worker to enter but be too small to allow continuous worker occupancy to take place

• The area features limited openings for entry and exit, causing air flow to be compromised

There are many examples of confined space environments in industry including aircraft fuel tanks, underground utility vaults, wine fermentation tanks and sewers.

Some confined spaces may require permits to enter, owing to the fact that they contain potentially hazardous atmospheres or materials that have the potential for engulfment. Inwardly sloping walls or floors can also pose dangers, because they reduce the volume of the space, and may also require a permit to enter.

Regardless of whether the area is permit required or not, all confined spaces should be treated as sources of potential gas hazards.

Why are confined spaces dangerous?
The limited volume size in a confined space allows dangerous gases to build up more quickly. In addition, inadequate air flow can allow the displacement of Oxygen by other gases, causing the risk of asphyxiation to an operator entering the area.

Some confined spaces require a permit to enter, due to the danger associated with them. Regardless of whether a permit is required, all confined spaces should be treated with caution and these environments need to be fully evaluated for hazards before they are entered. This includes stratified testing of the atmosphere in the space, prior to entry, to ensure it is free of gas hazards