FACTORIES AND MACHINERY (STEAM BOILER AND
UNFIRED PRESSURE VESSEL)
Regulation 65. Coupled boilers and pressure vessels.
(1) Where two or more steam boilers or unfired pressure vessels having differing authorised safe
working pressures are coupled together, such steam boilers or unfired pressure vessels shall not
be operated at a pressure greater than that of the steam boiler or unfired pressure vessel having
the lowest authorised safe working pressure:
Provided that each such steam boiler or unfired pressure vessel may be operated at its own
authorised working pressure where suitable pressure reducing valves are fitted to the system to
the satisfaction of an Inspector to ensure that no steam boiler or unfired pressure vessel can be
subjected to a pressure greater than its authorised safe working pressure.
(2) Every reducing valve shall be fitted with a suitable safety valve and a suitable pressure gauge
adjacent thereto on the low pressure side.
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