Larger machinery and equipment may contain internal areas where a hazardous environment may occur by design, or as a result of the work being done. A confined space may exist where people require access to a mostly closed area that presents difficult or restricted path of access, where oxygen levels may be depleted or displaced, or where harmful levels of contaminate, such as gas, vapour or dust, exist.
There are legal requirements that must be observed prior to allowing people to enter a confined space. • Training in confined space entry. • Issue of entry permits. • Continuous monitoring and supervision.
Administrative controls use systems of work to reduce risk by providing a framework of expected behaviours. Examples are rotation of staff to reduce exposure to a hazard, or a documented safe system of work, such as lockout tagout. These types of controls rely on extensive instruction, information, training and supervision.
• Separating people from non-mechanical hazards is necessary where the emission cannot be controlled at the source through elimination or substitution. Hazardous machinery and equipment emission controls rely largely on isolating of people from the hazardous emission. Hoods, lids, covers or impervious guards (solid barriers that prevent escape of the emission) can serve to contain a number of different types of emissions within machinery and/or equipment.