FACTORIES AND MACHINERY (STEAM BOILER AND
UNFIRED PRESSURE VESSEL)
Regulation 46. Doors.
Where it is necessary to load and unload an unfired pressure vessel any door fitted thereto shall-
(i) if of the bayonet or other quick opening type, be provided with a mechanical interlock
that will prevent the door from being opened until all internal pressure has been relieved;
(ii) if of the bolted type, be provided with a tell-tale valve in full sight of the attendant.
Such tell-tale valve shall indicate by visual or other means the absence of pressure in the
unfired pressure vessel.
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