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The place to look at US confined spaces legislation and regulations is
OSHA. Quoting from the OSHA
website:
Many workplaces contain spaces that are considered "confined" because their configurations hinder
the activities of any employees who must enter, work in, and exit them. For example, employees who
work in process vessels generally must squeeze in and out through narrow openings and perform their
tasks while cramped or contorted. OSHA uses the term "confined space" to describe such spaces. In
addition, there are many instances where employees who work in confined spaces face increased risk
of exposure to serious hazards. In some cases, confinement itself poses entrapment hazards. In
other cases, confined space work keeps employees closer to hazards, such as asphyxiating
atmospheres or the moving parts of machinery. OSHA uses the term "permit-required confined space"
(permit space) to describe those spaces that both meet the definition of "confined space" and pose
health or safety hazards.
Under UK domestic law (the Health and Safety at Work Act 1974) employers are responsible for ensuring
the safety of their employees and others. This responsibility is reinforced by regulations. The
Health and Safety Executive (HSE)
says:
A confined space is a place which is substantially enclosed (though not always entirely), and where
serious injury can occur from hazardous substances or conditions within the space or nearby (e.g.
lack of oxygen). A number of people are killed or seriously injured in the UK each year in confined
spaces. These occur across a wide range of industries, from those involving complex plant through
simple storage vessels. Those killed include not only people working in the confined spaces but
those who try to rescue them without proper training or equipment.
When an employee has to work in a confined space they are required to take appropriate safety
precautions. Companies must provide adequate training, safety equipment and permits for the work to
take place.
Snake-arm robots offer an alternative to this expediture.
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