Boilers
and other pressure vessels
(1) In
every ship every boiler or other pressure vessel and its respective mountings
shall, before being put into service for the first time, be subjected to a
hydraulic test to a pressure suitably in excess of the working pressure which
will ensure that the boiler or other pressure vessel and its mountings are
adequate in strength and design for the service for which it is intended and
having regard to -
(a) the design and the material of which it is
constructed;
(b) the purpose for which it is intended to be
used; and
(c) the working conditions under which it is
intended to be used;
and every such boiler or other pressure
vessel and its respective mountings shall be maintained in an efficient
condition.
(2) In
every such ship provision shall be made which will facilitate the cleaning and
inspection of every pressure vessel.
(3) (a) Means shall be provided which will prevent
overpressure in any part of boilers and other pressure vessels, and in
particular every boiler and every unfired steam generator shall be provided
with not less than two safety valves.
(b) The Administration may, having regard to the
output or any other feature of any boiler or unfired steam generator, permit
only one safety valve to be fitted if it is satisfied that adequate protection
against overpressure is provided.
Additional requirements for
ships constructed on or after 1 September 1984
(4) Every
unattended oil fired boiler shall be provided with arrangements to shut off the
fuel supply and give an alarm at an attended location in the event of low
boiler water level, combustion, air supply failure or flame failure.
(5) Every
boiler designed to contain water at a specific level shall be provided with at
least two means for indicating the water level, at least one of which shall be
a direct reading gauge glass.
(6) Every
water-tube boiler serving turbine machinery shall be fitted with a high water
level alarm.
(7) Means
shall be provided to test and control the quality of the water in boilers.
Boiler
feed systems
(1) Every boiler which provides services
essential for the safety of the ship and which would be rendered dangerous by
the failure of its feed water supply shall be provided with not less than two
efficient and separate feed water systems so arranged that either of such
systems may be opened for
inspection or overhaul without affecting the
efficiency of the other and means shall be provided which will prevent
overpressure in any part of the systems.
(2) (a) Every feed check valve, fitting, or pipe
through which feed water passes from a pump to such boilers shall be designed
and constructed to withstand the maximum working stresses to which it may be
subjected, with a factor of safety which is adequate having regard to the
material of which it is constructed and the working conditions under which it
will be used.
(b) Every such valve, fitting, or pipe shall,
before being put into service for the first time, be subjected to a hydraulic
test suitably in excess of the maximum working pressure of the boiler to which
it is connected or of the maximum working pressure to which the feed line may
be subjected, whichever shall be the greater, and shall be maintained in an
efficient condition.
(c) The feed pipes shall be adequately supported.
(3) Where
in any ship it is possible for oil to enter the feed water system of a boiler,
the arrangements for supplying boiler feed water shall provide for the
interception of oil in the feed water.
Additional requirements for
ships constructed on or after 1 September 1984
(4) Means
shall be provided to test and control the quality of the feed water to boilers.
Steam
pipe systems
(1) In
every ship every steam pipe and every fitting connected thereto through which steam
may pass shall be so designed and constructed as to withstand the maximum
working stresses to which it may be subjected, with a factor of safety which is
adequate having regard to –
(a) the material of which it is constructed; and
(b) the working conditions under which it will be
used.
(2) Without
prejudice to the generality of the foregoing, every steam pipe or fitting
shall, before being put into service for the first time, be subjected to a test
by hydraulic pressure to a pressure suitably in excess of the working pressure
to be determined having regard to the requirements of subsubRules (1)(a) and
(b) and every such steam pipe or fitting shall be maintained in an efficient
condition.
(3) Steam
pipes shall be adequately supported.
(4) Provision
shall be made which will avoid excessive stress likely to lead to the failure
of any such steam pipe or fitting, whether by reason of variation in
temperature, vibration or otherwise.
(5) Efficient
means shall be provided for draining every such steam pipe so as to ensure that
the interior of the pipe is kept free of water and that water hammer action
will not occur under any condition likely to arise in the course of the
intended service of the ship.
(6) Where a steam pipe is connected to any
source at a higher pressure than it can otherwise withstand with an adequate
factor of safety, an efficient reducing valve, relief valve and pressure gauge
shall be fitted to such pipe.
1 comments:
Hello,
Thanks for increasing my knowledge about Boilers and other Pressure Vessels, Boiler feed Systems, and Steam Pipe Systems.
Pressure Vessels
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