9.3.1 To a limited degree, internal visual inspection
will reveal damage at an early stage. Diagnostic monitoring systems
should be used as they greatly assist in maintaining the effectiveness
of the equipment. By fitting two equal-sized blowers or, alternatively,
supplying and retaining on board a spare impeller with a shaft for
each blower, an acceptable level of availability is ensured. Visual
inspection through the available openings in the blower casing is
adequate for this purpose.
9.3.2 An inspection of inert gas blowers should
include:
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.1 internal inspection of the blower casing for
soot deposits or signs of corrosive attack;
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.2 examination of fixed or portable washing system;
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.3 inspection of the functioning of the fresh
water flushing arrangements, where fitted;
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.4 inspection of the drain lines from the blower
casing to ensure that they are clear and operative;
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.5 observation of the blower under running conditions
for signs of excessive vibration, indicating too large an imbalance.