Section
6 Machinery Surveys – General requirements
6.1 Annual, Intermediate, Docking and In-water
Surveys
6.2 Complete Surveys
6.2.1 While the unit is in dry dock or subject to In-water Surveys, all
openings to the sea in the machinery spaces, pump-rooms and other spaces, together
with the valves, cocks and the fastenings with which these are connected to the
hull, are to be examined and the fastenings to the shell plating are to be renewed
when considered necessary by the Surveyor.
6.2.3 An examination is to be made of all reduction gears, complete with all
wheels, pinions, shafts, bearings and gear teeth, thrust bearings and incorporated
clutch arrangements.
6.2.4 The following auxiliaries and components are also to be examined:
- Auxiliary engines, auxiliary air compressors with their
intercoolers, filters and/or oil separators and safety devices, and all pumps
and components used for essential services.
- Steering machinery.
- Windlass and mooring winches and associated driving equipment, where
fitted.
- Evaporators (other than those of vacuum type) and their safety
valves, which should be seen in operation under steam.
- The holding-down bolts and chocks of main and auxiliary engines,
gear cases, thrust blocks and intermediate shaft bearings.
- Where Thrusters are fitted and have been assigned the Descriptive
Note ThCM, the degree of inspection required whilst in dock will be determined
by the analysis of Condition Monitoring records. Refer to ShipRight Machinery
Planned Maintenance and Condition Monitoring, Section 6.
6.2.5 All air receivers for essential services, together with their mountings,
valves and safety devices, are to be cleaned internally and examined internally and
externally. If internal examination of the air receivers is not practicable, they
are to be tested hydraulically to 1,3 times the working pressure.
6.2.6 The valves, cocks and strainers of the bilge system, including bilge
injection, are to be opened up as considered necessary by the Surveyor and, together
with pipes, are to be examined and tested under working conditions. The fuel oil,
feed, lubricating oil and cooling water systems, also the ballast connections and
blanking arrangements to deep tanks, pre-load tanks or brine tanks which may carry
different liquid, together with all pressure filters, heaters and coolers used for
essential services, are to be opened up and examined or tested, as considered
necessary by the Surveyor. All safety devices for the foregoing items are to be
examined.
6.2.7 Fuel tanks which do not form part of the unit's structure are to be
examined, and if considered necessary by the Surveyor, they are to be tested to the
pressure specified for new tanks. The tanks need not be examined internally at the
first survey if they are found satisfactory on external inspection. The mountings,
fittings and remote controls of all fuel oil tanks are to be examined, so far as is
practicable.
6.2.8 Arrangements are to be made by Owners for opening up and examination of
all sea connections afloat at five-yearly intervals.
6.2.9 Where remote and/or automatic controls are fitted for essential
machinery, they are to be tested to under operating conditions to an approved test
schedule.
6.2.10 On units fitted with a dynamic positioning system and/or
thruster-assisted positional mooring system, the control system and associated
machinery items, including pressure vessels, are to be examined and tested to
demonstrate that they are in good working order.
6.2.11 In addition to the above, detailed requirements for steam and gas
turbines, engines, electrical installations and boilers are given in Sections 7,
Pt 1, Ch 3, 8 Reciprocating internal combustion engines – Detailed requirements, Pt 1, Ch 3, 9 Electrical equipment and Pt 1, Ch 3, 10 Boilers respectively. In certain instances, upon application by
the Owner or where indicated by the maker's servicing recommendations, the
Classification Committee will give consideration to the circumstances where
deviation from these detailed requirements is warranted, taking account of design,
appropriate indicating equipment (e.g., vibration indicators) and operational
records.
6.2.12 For self-elevating units, the following essential parts of the elevating
and lowering machinery, which are critical to the safety of the unit, are to be
specially examined:
- Couplings, pinions and gears of the climbing pinion gear train of
rack and pinion systems are to be examined and NDE is to be carried out to the
Surveyor's satisfaction.
- Attachment of the reduction gear case to the jackcases or other
supporting structure is to be examined for wear and bolting arrangements
examined for security.
- Leg guides and shock pads are to be examined for wear.
- The fixation system, where fitted, is to be examined for wear and
satisfactory operation/engagement.
- Grease injection lubrication system is to be examined for damage to
piping and nozzles. Satisfactory operation of system is to be verified.
- Operational tests of the jacking system are to be carried out to the
Surveyor's satisfaction.
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