Section
5 Special Survey - General - Hull requirements
5.1 General
5.1.1 The survey
is to be of sufficient extent to ensure that the hull and related
equipment is in satisfactory condition and is fit for its intended
purpose, subject to proper maintenance and operation and to Periodical
Surveys being carried out as required by the Regulations.
5.1.4 For vessels
assigned the Laid-up notation, an Underwater Examination
(UWE) and general examination of hull and machinery is to be carried
out in lieu of the normal Special Survey requirements.
5.2 Preparation
5.2.1 The craft
is to be prepared for survey in accordance with the requirements of Table 3.5.1 Survey preparation. The preparation should
be of sufficient extent to facilitate an examination to ascertain
any excessive corrosion, erosion, deformation, fractures, damages
and other structural deterioration.
Table 3.5.1 Survey preparation
| Special Survey I
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Special
Survey II
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Special
Survey III
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| (Craft
5 years old)
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(Craft
10 years old)
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(Craft
15 years old) and subsequent special surveys
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(1) The interior of the craft is to be sufficiently opened
out by the removal of lining, ceiling/cabin sole, portable tanks and
ballast, etc. as required in order that the Surveyor may be satisfied as
to the condition of suspect areas of the structure, see
Pt 1, Ch 3, 1.5 Definitions 1.5.4. A record is to be made of those
areas where lining, ceiling/cabin sole etc. were opened out and where
equipment was removed during the survey. This record is to be retained
for reference during subsequent surveys.
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In addition to the requirements for
Special Survey I, the following are to be complied with.
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In addition to the requirements of
Special Survey II the following are to be complied with.
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(1) The chain locker is to be cleared and cleaned internally
for examination of the structure and examination of the cable securing
arrangements. The chain cables/anchor warps, as applicable, are to be
ranged for inspection. The anchors are to be cleaned and placed in a
accessible position for inspection.
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(1) Linings, ceiling/cabin soles, etc. are to be removed as
required in order that the Surveyor may be satisfied as to the condition
of the structure.
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| For steel craft:-
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(2) Portions of wood sheathing, or other covering, on steel
decks are to be removed, as considered necessary by the Surveyor, in
order to ascertain the condition of the plating.
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(2) Machinery compartments, fore and aft peaks and other
spaces as directed by the Surveyor, are to be cleared and cleaned as
necessary, and the bilges and limbers all fore and aft are to be cleaned
and prepared for examination. Platform plates in engine spaces are to be
lifted as may be necessary, for the examination of the structure below.
Where necessary, pipework may be required to be removed for examination
of the structure.
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(2) The rudder is to be unshipped for examination of the
rudder stock and trunk at the discretion of the Surveyor.
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(3) Where spaces are insulated, sufficient insulation is to
be removed in each space to enable Surveyors to be satisfied with the
condition of the structure.
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(4) Linings are to be removed in way of shell plating
immediately above tank top connections to the side shell, in way of
galleys/washrooms and beneath portlights and windows.
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(3) In way of the single and/or double bottom areas, a
sufficient amount of ceiling/cabin sole is to be lifted to permit
examination of the bilges and/or tanktops below.
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(4) All integral tanks are to be cleaned as necessary to
permit examination. (For steel craft see
Table 3.5.2 Tank internal examination
requirements for steel craft).
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(5) The masts and the sail/wind
propulsion system are to be unshipped for survey. The whole of the standing
rigging, including rigging screws, bolts, pins and fittings, is to be fully
or partly disassembled as considered necessary by the Surveyor.
Note This requirement may be waived at alternate Special
Surveys or when the construction does not allow disassembly, provided
that the masts and rigging are thoroughly examined in situ.
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Note ‘unshipped’ means removed from its fixed or regular
position and lay down, providing access for Close-up Survey.
‘disassembled’ means to dismantle and laying out all lines, tackles
and other removable parts to the extent necessary to establish the
condition of the rigging components.
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5.2.2 Where,
in accordance with Table 3.5.1 Survey preparation,
the craft is opened out by removal of linings, ceilings, cabin sole
etc. and defects are found, further opening out will be required in
order that the Surveyor can confirm the full extent of the defects.
5.3 Examination and testing – General
5.3.2 Double bottom compartments, peak tanks and all other integral tanks are to
be tested by a head sufficient to give the maximum pressure that can be experienced in
service. Tanks may be tested afloat provided that their internal examination is also
carried out afloat.
5.3.3 Where repairs are effected to the hull shell or bulkheads, any integral
tanks in way are to be tested to the Surveyor's satisfaction on completion of these
repairs.
5.3.4 All decks, casings and superstructures are to be examined.
5.3.6 Attention is to be given to the corners of openings and other
discontinuities in the hull structure.
5.3.7 The anchors are to be examined. If the chain cables are ranged they are to
be examined together with the chain locker, see
Table 3.5.1 Survey preparation. If any length of chain cable is found to be
reduced in mean diameter at its most worn part by 12 per cent or more from its nominal
diameter, it is to be renewed. The windlass is to be examined.
5.3.8 The Surveyor is to be satisfied that there are suitable towlines and
mooring ropes when these are a Rule requirement.
5.3.9 Rigs used for propulsion using wind force, associated structure and
equipment, where fitted, are to be examined, see
Table 3.5.1 Survey preparation.
This examination may be undertaken by a Surveyor and/or by a firm approved by LR.
5.3.10 Representative structural fastenings, e.g. bolts in way of resiliently
mounted deckhouses, are to be tested to ascertain their soundness and may require to be
drawn for examination at the discretion of the Surveyor.
5.3.13 Ship side valves (i.e. sea connections, scuppers and sanitary discharges)
are to be tested once reassembled.
5.3.14 At Special Survey III and subsequent special surveys, structural
downflooding ducts and structural ventilation ducts are to be internally examined.
5.4 Examination and testing - Additional items for steel craft
5.4.1 All integral
tanks are generally to be internally examined. However, in certain
circumstances the internal examination of lubricating oil, fresh water
and fuel oil tanks may be waived. For the minimum extent of tank internal
examination, see
Table 3.5.2 Tank internal examination
requirements for steel craft.
Table 3.5.2 Tank internal examination
requirements for steel craft
| Tank
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Special
Survey I
(Craft 5 years old)
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Special
Survey II
(Craft 10 years old)
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Special
Survey III
(Craft 15 years old)
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Special
Survey IV
(Craft 20 years old)
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All
Subsequent Special Surveys
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| Peaks
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All tanks
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All tanks
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All tanks
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All tanks
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All tanks
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| Salt water ballast
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All tanks
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All tanks
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All tanks
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All tanks
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All tanks
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| Lubricating oil
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None
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None
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See Note 2
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See Note 3
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All tanks
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| Fresh water
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None
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See Note 1
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See Note 2
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See Note 3
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All tanks
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| Fuel oil
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None
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See Note 1
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See Note 2
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See Note 3
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All tanks
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| Sanitary
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All tanks
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All tanks
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All tanks
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All tanks
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All tanks
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Note
1. Tanks (excluding peak tanks) used
exclusively for fuel oil or fresh water need not all be examined
internally provided that the Surveyor is satisfied with the condition,
after both external examination and testing and from an internal
examination of the after end of one forward double bottom tank, and of
one selected deep tank.
Note
2. Tanks (excluding peak tanks) used
exclusively for fuel oil, fuel oil and fresh water ballast, or
lubricating oil, need not all be examined internally provided that the
Surveyor is satisfied with the condition, after both external
examination and testing and from an internal examination of one double
bottom tank forward and one aft and one deep tank.
Note
3. Tanks (excluding peak tanks) used
exclusively for fuel oil, fuel oil and fresh water ballast, or
lubricating oil, need not all be examined internally provided that the
Surveyor is satisfied with the condition, after both external
examination and testing and from internal examination of one double
bottom tank amidships, one forward and one aft and one deep tank.
Note
4. When examining tanks internally the
Surveyor is to verify that striking plates or other additional
reinforcement is fitted under sounding pipes. In the case of tanks
fitted only with remote gauging facilities, the satisfactory operation
of the gauges is to be confirmed.
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5.4.2 In salt
water ballast spaces, integral sanitary tanks and bilges where the
protective coating is found to be other than in GOOD condition as
defined in Pt 1, Ch 3, 1.5 Definitions 1.5.7 and it has not
been repaired, maintenance of class will be subject to the spaces
in question being internally examined and gauged as necessary at Annual
Surveys.
5.4.3 The protection
of steelwork, other than as referred to in 5.4.2 should be examined
and made good where necessary on satisfactory completion of the survey.
In areas where the inner surface of the bottom plating is covered
with cement, asphalt or other composition, the removal of this covering
may be dispensed with, provided that it is found sound and adhering
satisfactorily to the steel.
5.4.4 Wood deck
sheathing is to be examined and the caulking is to be tested and recaulked
as necessary. If decay or rot is found, or the wood is excessively
worn, the wood is to be renewed. Attention is to be given to the condition
of the plating under wood deck sheathing or other deck covering. If
it is found that such coverings are broken, or are not adhering closely
to the plating, sections are to be removed as necessary to ascertain
the condition of the plating. See also
Pt 1, Ch 3, 1.2 Surveys for damage or alterations 1.2.1.
5.4.5 The structure
in way of bimetallic connections e.g. to aluminium alloy deckhouses
is to be examined.
5.4.6 The Surveyors
may require to measure the thickness of the material in any portion
of the structure where signs of wastage are evident or wastage is
normally found. Any parts of the structure which are found defective
or excessively reduced in scantlings are to be made good by materials
of the approved scantlings and quality. The minimum requirements for
thickness measurements are given in Pt 1, Ch 3, 6 Special Survey - Thickness measurement requirements for steel craft.
5.5 Examination and testing - Additional items for aluminium alloy
craft
5.5.1 The structure
in way of any bimetallic connections is to be examined and the efficiency
of the insulation arrangements confirmed.
5.5.2 The Surveyor
may require to measure the thickness of the material in any portion
of the structure where signs of deterioration are evident or may normally
be found. Any parts of the structure which are found defective or
excessively reduced in scantlings are to be made good by materials
of the approved scantlings and quality.
5.6 Examination and testing - Additional items for composite craft
5.6.1 The bonded
attachments of frames, floors, bulkheads, structural joinery, engine
bearers, sterntubes, rudder tubes, and integral tank boundaries are
to be examined.
5.6.2 The hull
to deck joint together with any joints between the deck and deckhouses
or superstructures are to be examined.
5.6.3 The structure
in way of the bolted attachment of fittings including guardrail stanchions,
windlass, shaft brackets, fendering, mooring bitts, etc. is to be
examined.
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