1 Every steam boiler and every unfired steam generator
shall be provided with not less than two safety valves of adequate
capacity. However, having regard to the output or any other features
of any boiler or unfired steam generator, the Administration may permit
only one safety valve to be fitted if it is satisfied that adequate
protection against overpressure is thereby provided.
2 Each oil-fired boiler which is intended to operate
without manual supervision shall have safety arrangements which shut
off the fuel supply and give an alarm in the case of low water level,
air supply failure or flame failure.
3 Water tube boilers serving turbine propulsion
machinery shall be fitted with a high-water-level alarm.
4 Every steam generating system which provides
services essential for the safety of the ship, or which could be rendered
dangerous by the failure of its feedwater supply, shall be provided
with not less than two separate feedwater systems from and including
the feed pumps, noting that a single penetration of the steam drum
is acceptable. Unless overpressure is prevented by the pump characteristics,
means shall be provided which will prevent over-pressure in any part
of the systems.
5 Boilers shall be provided with means to supervise
and control the quality of the feedwater. Suitable arrangements shall
be provided to preclude, as far as practicable, the entry of oil or
other contaminants which may adversely affect the boiler.
6 Every boiler essential for the safety of the
ship and designed to contain water at a specified level shall be provided
with at least two means for indicating its water level, at least one
of which shall be a direct reading gauge glass.