What is the minimum clearance required between a manhole cover installed at the top of a boiler and the ceiling above?

The minimum clearance required between a manhole cover installed at the top of a boiler and the ceiling above is 3 feet. This requirement is established to ensure safe access for maintenance and inspection of the boiler. Adequate clearance is crucial for personnel to work comfortably and safely, providing enough space to remove the cover without obstruction and reducing the risk of injury.

This 3-foot clearance is also necessary considering the height of typical tools and equipment that might be used during maintenance tasks, as well as providing a margin for space to maneuver safely around the boiler. Insufficient clearance could lead to hazardous situations, making compliance with this regulation essential for safety standards in mechanical systems and boiler operations.