9.1.1 The ability of the propulsion system to
alter the direction of thrust, if this is necessary to bring the craft
to rest from maximum ahead speed in a reasonable time and distance,
should be demonstrated to the satisfaction of the Administration.
9.1.2 The design, construction of, and materials
used for the machinery of craft should be such that the probability
of failure leading to hazard of the craft or occupants is remotefootnote.
9.1.3 In the design and installation of machinery
containing high energy rotating parts, consideration should be given
to the likelihood of ejection of high energy debris in the event of
failure. Where practicable, the debris should be contained, either
within the machinery or by the provision of external guards. Where
this is not practicable, the probability of disruptive failure leading
to the ejection of debris which would hazard the craft, its occupants
or any other person should be extremely remotefootnote.
9.1.4 The Administration should be satisfied that
the reliability of the machinery (i.e. its ability to continue to
function), as installed in the craft, is adequate for its intended
use. While the failure of the machinery will not always be a serious
hazard to safety, machinery reliability is a necessary ingredient
of safety in a great many craft applications. The Administration should
take into account such factors as whether alternative power supplies
are available and the worst intended conditions for the craft. They
may take into account evidence arising from the use of the machinery
in other applications (provided that any necessary marinization has
been carried out and that no unsuitable modifications have been added),
and evidence of testing other than in the craft.
9.1.5 The Administration may accept machinery
which does not show detailed compliance with the Code where it has
been used satisfactorily in a similar application, provided that they
are satisfied:
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(a) that the design, construction, installation
and prescribed maintenance are together adequate for its use in a
marine environment; and
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(b) that an equivalent level of safety will be
achieved.
9.1.6 Where only a small number of units of the
particular type of machinery have been manufactured, the Administration
should ensure that the detailed design, test, and quality control
during manufacture provide at least comparable assurance to the operating
experience obtainable from large numbers.
9.1.7 A failure mode and effects analysis should
be carried out, to the satisfaction of the Administration, for each
type of machinery and its associated controls in the system of installation.
In cases where faults can occur without being detected during routine
checks of the machinery, the analysis should take into account the
possibility of faults occurring simultaneously or consecutively.
9.1.8 The Administration should be satisfied that
the procedure used to control the quality of the machinery is adequate
for the particular product.
9.1.9 Each part of all machinery should be protected
against corrosion and deterioration, with due regard to the maintenance
it will receive, the environment in which it will operate and the
hazard arising if corrosion occurs.
9.1.10 The Administration should be satisfied
that such information is made available by the manufacturers as is
necessary to ensure that machinery can be installed correctly regarding
such factors as operating conditions and limitations.
9.1.11 All boilers and pressure vessels should
be of a design and construction adequate for the purpose intended
and should be so installed and protected as to minimize danger to
persons on board. In particular, attention should be paid to the materials
used in the construction and the working pressures and temperatures
at which the item will operate and the need to provide an adequate
margin of safety over the stresses normally produced in service. Every
boiler and pressure vessel should be fitted with adequate means to
prevent over-pressures in service and be subjected to a hydraulic
test before being put into service, and where appropriate at specified
intervals subsequently to a pressure suitably in excess of the working
pressure.