Wastewater Safety · Confined Spaces
What Is a Confined Space?
A confined space is large enough to enter, has limited entry or exit, and is not designed for continuous occupancy.
Wastewater examples may include wet wells, tanks, vaults, pits, manholes, digesters, and some channels or equipment chambers. A small opening is not required. A large tank can still be a confined space.
The employer evaluates spaces and identifies permit-required confined spaces. A permit space has an actual or possible serious hazard, such as dangerous air, engulfment, inward-moving walls, sloped floors, live equipment, or another major hazard.
Do not enter because a hatch is open or another worker entered before. Entry begins when any part of the body breaks the plane of the opening. Follow the site classification and procedure.
Space conditions can differ between facilities and over time. One wet well may have fixed ventilation and safe external equipment. Another may collect gas and require a full permit entry for the same maintenance task. Use the posted evaluation and current program rather than assuming similar-looking spaces have the same status.
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Wastewater Safety Fundamentals
This page comes from the course. It covers hazard checks, PPE, chemicals, air hazards, confined spaces, hazardous energy, falls and emergencies, one step at a time, with short knowledge checks and a certificate of completion.
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