Section
3 Intermediate Surveys – Hull and machinery requirements
3.1 General
3.1.1 Intermediate Surveys are to be held concurrently with statutory annual
or other relevant statutory surveys wherever practicable.
3.2 Intermediate Surveys
3.2.3 For all units over five years of age and up to 10 years of age,
representative salt-water ballast tanks and other spaces are to be examined as
follows:
-
Column-stabilised units and tension-leg units
Representative ballast tanks in pontoons, lower hulls, and
free-flooding compartments as accessible, and at least two ballast tanks
in columns and upper hull, if applicable.
-
Self-elevating units
Representative ballast tanks and at least two representative
pre-load tanks. Accessible free-flooding compartments in mat or
footings.
-
Ship units and other surface type units
One peak tank and at least two other representative ballast
tanks between the peak bulkheads used primarily for water ballast.
-
Deep draught caissons
Representative ballast tanks where accessible.
-
All unit types
Particular attention is to be given to corrosion control
systems in ballast tanks, free-flooding areas and other locations
subjected to sea water from both sides where accessible.
For tanks other than independent double bottom tanks, where a protective
coating is found in POOR condition, as defined in Pt 1, Ch 3, 1.5 Definitions, or other defects are found, where
a soft or semi-hard coating has been applied or where a protective coating was not
applied from the time of construction, the examination is to be extended to other
ballast tanks of the same type. For independent double bottom tanks where
substantial corrosion or other defects are found, the examination is to be extended
to other ballast tanks of the same type.
3.2.4 For all unit types over 10 years of age, the following is required:
- All salt-water ballast tanks and free-flooding areas are to be
examined.
- The anchors on units assigned the character (1) are to
be partially lowered and raised using the windlass.
3.2.5 The Surveyor is to carry out an examination and thickness measurement of
structure identified at the previous Special Survey as having substantial corrosion,
see Section 5.
3.2.6 In addition to Pt 1, Ch 3, 1.5 Definitions 1.5.1 to Pt 1, Ch 3, 1.5 Definitions 1.5.7 on units with crude oil bulk storage tanks, the
following are to be dealt with where applicable:
- An examination of oil storage, crude oil washing, bunker,
ballast, steam and vent piping on weather decks, as well as vent masts and
headers. If, upon examination, there is any doubt as to the condition of the
piping, the piping may be required to be pressure tested, gauged, or
both.
- A general examination within the areas deemed as dangerous, such
as cargo pump-rooms and spaces adjacent to and zones above cargo tanks, for
defective and non-certified safe type electrical equipment, improperly
installed, defective and dead-end wiring. An electrical insulation
resistance test of the circuits terminating in, or passing through, the
dangerous areas is to be carried out. If the unit is not in a gas-free
condition, the results of previously recorded test readings may be
accepted.
3.2.8 The following are to be examined where accessible:
- Turret and circumturret structure.
- Turret bearings and seals.
- Swivel stack bearings and seals.
- Mooring arm pivots and bearings.
3.2.9 For units with crude oil bulk storage tanks, in addition to Pt 1, Ch 3, 3.2 Intermediate Surveys 3.2.6, the following is required for units over 10 years
and less than 15 years of age:
- Overall survey of all salt-water ballast tanks, including any
combined salt-water ballast/crude oil storage tanks.
- Overall survey of at least two representative crude oil storage
tanks.
- Close-up Survey of salt-water ballast tanks to the same extent
as the previous Special Survey and two combined cargo/ballast tanks. Where
protective coatings are found to be in GOOD condition, as defined in Pt 1, Ch 3, 1.5 Definitions , the extent of Close-up
Survey may be specially considered.
- The thickness measurement requirements of Pt 1, Ch 3, 3.2 Intermediate Surveys 3.2.7 are to be complied with. In
areas where substantial corrosion, as defined in Pt 1, Ch 3, 1.5 Definitions, has been noted, additional
measurements are to be carried out to the satisfaction of the Surveyor. The
survey will not be considered complete until these additional thickness
measurements have been carried out.
- Machinery and boiler spaces, including tank tops, bilges and
cofferdams, sea suctions and overboard discharges, are to be generally
examined.
3.2.11 When hull/structure surveys are to be carried out on the Continuous
Survey basis, for all unit types over 10 years of age to comply with the
intermediate survey, all salt-water ballast tanks and free-flooding areas are to be
examined. The frequency of inspection all salt-water ballast tanks and free-flooding
areas is to be reduced to two and half years from the customary five year period.
One of the surveys in the five year cycle may be limited to an overall examination
of the tank. See also
Pt 1, Ch 3, 1.6 Planned survey programme.
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