6. Opening of entrance cover of confined space

It shall be the duty of the responsible person of a person entering or working in a confined space which contains any substance under pressure greater than atmospheric pressure to ensure that —

the entrance cover of the confined space is not removed unless the confined space is depressurised and rendered safe for opening; and

when such entrance cover is removed, the opening to the confined space is barricaded or guarded by railings or other effective means, to prevent any person or object from falling into the confined space.