Section
6 Special Survey - Bulk carriers - Hull requirements
6.1 General
6.1.2 In order
to maintain and/or assign the ESP notation, the following
requirements apply to the surveys of the hull structure and piping
systems in way of the cargo holds, cofferdam, pipe tunnels, void spaces,
topside tanks and double bottom tanks in way of the cargo hold area
and all salt-water ballast tanks.
6.2 Review of documentation on board
6.2.1 Prior to survey, the Surveyor is to examine the completeness of the
documentation onboard as detailed in Pt 1, Ch 3, 1.10 Documentation, and its contents as a basis for the
survey.
6.2.2 For CSR bulk carriers subject to SOLAS - International Convention for the Safety of Life at Sea
Chapter II-1 - Construction - Structure, subdivision and stability, machinery and electrical installations
Part A-1 - Structure of ships
Regulation 3-10 – Goal-based ship construction standards for bulk carriers and oil tankers, the Surveyor is to examine the
information held in the Goal Based Standard (GBS) Ship Construction File (SCF) stored on
board the ship. On completion of the survey, in the case of any major event, including,
but not limited to, substantial repair, conversion or any modification to the ship
structure, the Surveyor is to verify that the information stored on board of the ship
has been updated, and is to verify any addition and/or renewal of materials used for the
construction of the hull structure are documented within the GBS SCF list of
materials.
6.2.3 For CSR bulk carriers subject to SOLAS - International Convention for the Safety of Life at Sea
Chapter II-1 - Construction - Structure, subdivision and stability, machinery and electrical installations
Part A-1 - Structure of ships
Regulation 3-10 – Goal-based ship construction standards for bulk carriers and oil tankers, for the GBS SCF Supplement Ashore,
the Surveyor is to verify the information stored in the Archive Centre by examining the
list of information included in the Supplement Ashore. In addition, the Surveyor is to
confirm that the service contract with the Archive Centre remains valid. In the case of
any major event, including, but not limited to, substantial repair, conversion or
modification to the ship’s structure, the Surveyor is to verify that the information
stored in the Archive Centre has been updated by examining the list of updated
information included in the Supplement Ashore.
6.3 Planning for survey
6.3.1 A Survey
Programme is to be submitted by the Owner and is to include the proposals
for survey, including the means of providing access for Close-up Survey,
thickness measurement and tank testing and should take account of
the information detailed in Pt 1, Ch 3, 6.2 Review of documentation on board 6.2.1.
6.4 Overall survey
6.4.1 All
cargo holds, salt-water ballast tanks including double bottom tanks,
pipe tunnels, cofferdams and void spaces bounding cargo holds, decks
and outer hull are to be examined, and this examination is to be supplemented
by Close-up Survey, thickness measurement and testing as applicable,
to ensure that the structural integrity remains effective.
6.4.2 The
examination is to be sufficient to ascertain substantial corrosion,
significant deformation, fractures, damages or other structural deterioration
and, if deemed necessary by the Surveyor, suitable non-destructive
examination may be required.
6.4.3 Where
substantial corrosion, as defined in Pt 1, Ch 3, 1.5 Definitions,
is identified and is not rectified, this will be subject to re-examination
at Annual and Intermediate Surveys.
6.4.4 All
piping systems within the tanks and spaces indicated in Pt 1, Ch 3, 6.4 Overall survey 6.4.1 are to be examined and tested
under working conditions to ensure that the conditions remain satisfactory.
6.4.5 The
extent of survey of combined salt-water ballast cargo holds is to
be evaluated based on the records of ballast history, the extent and
condition of the corrosion protection system provided, and the extent
of structural diminution (corrosion).
6.4.6 Where
salt-water ballast tanks have been converted to void spaces the survey
extent is to be based upon salt-water ballast tank requirements.
6.4.7 Where
provided, in association with a corrosion control CC special
features notation, as defined in the Register Book, the
condition of the protective coating or corrosion prevention system
of cargo holds is to be examined.
6.4.8 For
ships fitted with water level detectors in cargo holds, ballast tanks
forward of the collision bulkhead and any dry or void space which
extends forward of the foremost cargo hold, an examination and a test
of the water ingress detection systems and of their alarms is to be
carried out.
6.4.9 For
ships fitted with a means for draining and pumping ballast tanks forward
of the collision bulkhead and the bilges of dry spaces, any part of
which extends forward of the foremost cargo hold, an examination and
a test of the draining and pumping systems including their controls
is to be carried out.
6.5 Testing
6.6 Close-up Survey
6.6.2 The
Close-up Survey may be extended, as deemed necessary by the Surveyor,
after taking into account the maintenance of the spaces under survey,
the condition of the corrosion prevention system and where spaces
have structural arrangements or details which have suffered defects
in similar spaces or on similar ships according to available information.
6.6.3 For
areas in tanks and cargo holds where coatings are found to be in GOOD
condition, as defined in Pt 1, Ch 3, 1.5 Definitions,
the extent of Close-up Surveys may be specially considered.
Table 3.6.1 Minimum requirements for Close-up
Survey - Single skin bulk carriers
Special Survey
I
(Ships 5 years old)
|
Special Survey
II
(Ships 10 years old)
|
Special
Survey III
(Ships 15 years old)
|
Special Survey
IV
(Ships 20 years old and over)
|
| (1) 25% of
shell frames and their end attachments in the forward cargo hold at
representative positions.
(2) Selected shell frames and
their end attachments in remaining cargo holds.
(3) 1 transverse web with associated plating and longitudinals
in 2 representative water ballast tanks of each type (i.e. topside, peak,
double bottom and hopper side tank).
(4) 2
selected cargo hold transverse bulkheads, including internal structure of
upper and lower stools, where fitted. This is to include the aft bulkhead
of the forward hold.See Note 1.
(5) All
cargo hold hatch covers and coamings (plating and stiffeners). See
Note 2.
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(1a) For bulk
carriers with a deadweight less than 100,000 tonnes, all shell frames in the
forward cargo hold and 25% of frames in each of the remaining cargo holds,
including their upper and lower end attachments and adjacent shell
plating.
(1b) For bulk carriers with a deadweight
equal to or greater than 100,000 tonnes, all shell frames in the forward
cargo hold and 50% of frames in each of the remaining cargo holds,
including their upper and lower end attachments and adjacent shell
plating.
(2) 1 transverse web with associated
plating and longitudinals in each water ballast tank.
(3) Forward and aft transverse bulkhead in 1 side ballast
tank, including stiffening system.
(4) All
cargo hold transverse bulkheads including internal structure of upper and
lower stools, where fitted. See Note 1.
(5)
All cargo hold hatch covers and coamings, (plating and stiffeners).
See Note 2.
(6) All deck plating and
underdeck structure inside line of hatch openings between all cargo hold
hatches.
|
(1)All shell
frames in the forward and one other selected cargo hold and 50% of frames in
each of the remaining cargo holds, including their upper and lower end
attachments and adjacent shell plating.
(2) All
transverse webs with associated plating and longitudinals in each water
ballast tank.
(3) All transverse bulkheads in
ballast tanks, including stiffening system.
(4)
All cargo hold transverse bulkheads, including internal structure of
upper and lower stools, where fitted. See Note 1.
(5) All cargo hold hatch covers and coamings (plating
and stiffeners). See Note 2.
(6) All
deck plating and underdeck structure inside line of hatch openings
between all cargo hold hatches.
|
(1) All shell
frames in all cargo holds, including their end attachments and adjacent
shell plating.
(2) All transverse webs with
associated plating and longitudinals in each water ballast tank.
(3) All transverse bulkheads in ballast tanks,
including stiffening system.
(4) All cargo hold
transverse bulkheads, including internal structure of upper and lower
stools, where fitted. See Note 1.
(5)
All cargo hold hatch covers and coamings (plating and stiffeners).
See Note 2.
(6) All deck plating and
underdeck structure inside line of hatch openings between all cargo hold
hatches.
|
Note 1. Close-up Survey of
transverse bulkheads to be carried out at four levels:
- Level (a) Immediately above the inner bottom and immediately
above the line of gussets (if fitted) and shedders for ships
without lower stool.
- Level (b) Immediately above and below the lower stool shelf plate
(for those ships fitted with lower stools), and immediately above
the line of the shedder plates.
- Level (c) About mid-height of the bulkhead.
- Level (d) Immediately below the upper deck plating and
immediately adjacent to the upper wing tank and immediately below
the upper stool shelf plate for those ships fitted with upper
stools, or immediately below the topside tanks.
Note 2. Subject to cargo
hold hatch covers of approved design (which structurally have no access
to the internals), close-up survey/thickness measurement shall be done of
accessible parts of hatch covers structures.
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Table 3.6.2 Minimum requirements for Close-up
Survey - Double skin bulk carriers (excluding ore carriers)
Special Survey
I
(Ships 5 years old)
|
Special Survey
II
(Ships 10 years old)
|
Special Survey
III
(Ships 15 years old)
|
Special Survey
IV
(Ships 20 years old and over)
|
| (1) 1 transverse web with associated
plating and longitudinals in 2 representative water ballast tanks of each
type. This is to include the foremost topside and double side tanks; peak
tanks and double bottom tanks.
(2) 2 selected cargo
hold transverse bulkheads including internal structure of upper and lower
stools, where fitted. See Note 1.
(3) All
cargo hold hatch covers and coamings (plating and stiffeners). See
Note 2.
|
(1) 1 transverse web with associated
plating and longitudinals in each water ballast tank.
(2) Forward and aft transverse bulkheads, including stiffening
system, in one complete double side ballast tank on one side of the ship
(i.e. port or starboard), see Note 3.
(3) 25% of ordinary transverse frames for transverse framing
system or 25% of longitudinals for longitudinal framing system on side
shell and inner side plating at forward, middle and aft parts, in the
foremost double side tanks.
(4) One transverse
bulkhead in each cargo hold including internal structure of upper and
lower stools, where fitted. See Note 1.
(5)
All cargo hold hatch covers and coamings (plating and stiffeners).
See Note 2.
(6)All deck plating and
underdeck structure inside line of hatch openings between all cargo hold
hatches.
|
(1)All transverse webs with associated
plating and longitudinals in each water ballast tank.
(2)
All transverse bulkheads in ballast tanks, including stiffening
system.
(3) 25% of ordinary transverse frames
for transverse framing system or 25% of longitudinals for longitudinal
framing system on side shell and inner side plating at forward, middle
and aft parts, in all double side tanks.
(4)
All cargo hold transverse bulkheads including internal structure of upper
and lower stools, where fitted. See Note 1.
(5) All cargo hold hatch covers and coamings (plating and
stiffeners). See Note 2.
(6) All deck
plating and underdeck structure inside line of hatch openings between all
cargo hold hatches.
|
(1) All transverse webs with associated
plating and longitudinals in each water ballast tank.
(2)
All transverse bulkheads in ballast tanks, including stiffening
system.
(3) All ordinary transverse frames for
transverse framing system or all longitudinals for longitudinal framing
system on side shell and inner side plating at forward, middle and aft
parts, in all double side tanks.
(4) All cargo
hold transverse bulkheads including internal structure of upper and lower
stools, where fitted. See Note 1.
(5)
All cargo hold hatch covers and coamings (plating and stiffeners).
See Note 2.
(6) All deck plating and
underdeck structure inside line of hatch openings between all cargo hold
hatches.
|
1.
Close-up survey of transverse bulkheads to be carried out at four levels:
- Level (a) Immediately above the inner bottom and immediately
above the line of gussets (if fitted) and shedders for ships
without lower stool.
- Level (b) Immediately above and below the lower stool shelf
plate (for those ships fitted with lower stools), and
immediately above the line of the shedder plates.
- Level (c) About mid-height of the bulkhead.
- Level (d) Immediately below the upper deck plating and
immediately adjacent to the upper wing tank and immediately
below the upper stool shelf plate for those ships fitted with
upper stools, or immediately below the topside tanks.
Note 2. Subject to cargo
hold hatch covers of approved design (which structurally have no access
to the internals), close-up survey/thickness measurement shall be done of
accessible parts of hatch covers structures.
Note 3. Complete ballast
tank means topside tank, hopper tank, double bottom tank and double side
tank, even if these are separate.
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Table 3.6.3 Minimum requirements for Close-up
Survey - Ore carriers
Special Survey
I
(Ships 5 years old)
|
Special Survey
II
(Ships 10 years old)
|
Special Survey
III
(Ships 15 years old)
|
Special Survey
IV
(Ships 20 years old and over)
|
| (1) 1 web frame ring complete including
adjacent structural members in a water ballast wing tank.
(2) 1 transverse bulkhead lower part including girder system
and adjacent structural members in a ballast tank.
(3) 2 selected cargo hold transverse bulkheads, including
internal structure of upper and lower stools where fitted. See
Note 1.
(4) All cargo hold hatch covers and
coamings (plating and stiffeners). See Note 2.
|
(1) All web frame rings complete including
adjacent structural members in a water ballast wing tank.
(2) 1 deck transverse including adjacent structural members in
each remaining water ballast tank.
(3) Forward
and aft transverse bulkheads including girder system and adjacent
structural members in a ballast wing tank.
(4) 1
transverse bulkhead lower part including girder system and adjacent
structural members in each remaining ballast tank.
(5) 1 transverse bulkhead in each cargo hold, including
internal structure of upper and lower stools where fitted. See
Note 1.
(6) All cargo hold hatch covers and
coamings (plating and stiffeners). See Note 2.
(7) All deck plating and under deck structure inside line of
hatch openings between all cargo hold hatches.
|
(1) All web frame rings complete including
adjacent structural members in each water ballast tank.
(2)
All transverse bulkheads including girder system and adjacent
structural members in each ballast tank.
(3) 1
web frame ring complete including adjacent structural members in each
wing void space.
(4) Additional web frame rings
including adjacent structural members in void spaces as deemed necessary
by the Surveyor.
(5) All cargo hold transverse
bulkheads, including internal structure of upper and lower stools where
fitted. See Note 1.
(6)All cargo hold
hatch covers and coamings (plating and stiffeners). See Note
2.
(7)All deck plating and under deck structure
inside line of hatch openings between all cargo hold hatches.
|
(1) All web frame rings complete
including adjacent structural members in each water ballast tank.
(2) All transverse bulkheads including girder system
and adjacent structural members in each ballast tank.
(3) 1 web frame ring complete including adjacent structural
members in each wing void space.
(4) Additional
web frame rings including adjacent structural members in void spaces as
deemed necessary by the Surveyor.
(5) All cargo
hold transverse bulkheads, including internal structure of upper and
lower stools where fitted. See Note 1.
(6)
All cargo hold hatch covers and coamings (plating and stiffeners).
See Note 2.
(7) All deck plating and
under deck structure inside line of hatch openings between all cargo hold
hatches.
|
Note 1. Close-up Survey of
transverse bulkheads to be carried out at four levels:
- Level (a) Immediately above the inner bottom and immediately
above the line of gussets (if fitted) and shedders for ships
without lower stool.
- Level (b) Immediately above and below the lower stool shelf plate
(for those ships fitted with lower stools), and immediately above
the line of the shedder plates.
- Level (c) About mid-height of the bulkhead.
- Level (d) Immediately below the upper deck plating and
immediately adjacent to the upper wing tank and immediately below
the upper stool shelf plate for those ships fitted with upper
stools, or immediately below the topside tanks.
Note 2. Subject to cargo
hold hatch covers of approved design (which structurally have no access
to the internals), close-up survey/thickness measurement shall be done of
accessible parts of hatch covers structures.
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6.7 Thickness measurement
6.7.2 In areas where substantial corrosion, as defined in Pt 1, Ch 3, 1.5 Definitions, has been noted then additional measurements are to be carried out,
as applicable, in accordance with Table 3.6.5 Thickness measurement - Single
skin bulk carriers - Shell plating and stiffening, with substantial corrosion, Table 3.6.6 Thickness measurement - Single
skin bulk carriers - Double bottom and hopper structure, with substantial
corrosion, Table 3.6.7 Thickness measurement - Single and
double skin bulk carriers - Transverse bulkheads in cargo holds, with substantial
corrosion, Table 3.6.8 Thickness measurement - Single
skin and double skin bulk carriers - Deck structure* with substantial corrosion , Table 3.6.9 Thickness measurement - Double
skin bulk carriers - Double side space structure (including wing void spaces of ore
carriers), with substantial corrosion and Table 3.6.10 Thickness measurement - Double
skin bulk carriers - Double side space structure (including wing void spaces of ore
carriers), with substantial corrosion to determine the full extent of the corrosion
pattern. The survey will not be considered complete until these additional thickness
measurements have been carried out. For bulk carriers built in accordance with the IACS
Common Structural Rules (CSR), the areas identified with substantial corrosion may be
either:
-
protected by coating
applied in accordance with the coating manufacturer’s requirements
and examined at Annual Surveys to confirm the coating in way is still
in GOOD condition, or alternatively;
-
subject to thickness
measurement at Annual Surveys.
6.7.3 Thickness
measurement is required to determine both general and local levels
of corrosion in salt water ballast tanks and in the shell frames and
their end attachments in all cargo holds. Thickness measurements are
also to be carried out to determine the corrosion levels on the transverse
bulkhead plating.
6.7.4 Single skin bulk carriers contracted for construction prior to 1 July 1998
are to undergo a re-assessment and evaluation of their cargo hold shell frames. The
number of shell frames to be measured is equivalent to number of shell frames subject to
Close-Up Survey (see
Table 3.6.1 Minimum requirements for Close-up
Survey - Single skin bulk carriers), with representative measurements to be taken
at specific areas for each frame. The extent of thickness measurement may be specially
considered, but not dispensed with in its entirety, by the Surveyor, provided the
structural members indicate no thickness diminution with respect to the Rule thickness
and the coating is found in 'as-new' condition (i.e. without breakdown or rusting).
Repairs to shell frames are to be based upon the minimum thickness values shown in the
evaluation records.
6.7.5 For
bulk carriers built in accordance with the IACS Common Structural
Rules (CSR), the ship’s longitudinal strength is to be evaluated
by using the thickness of structural members measured, renewed and
reinforced, as appropriate, during the Special Surveys carried out
after the ship reaches 15 years of age (or during the Special Survey
No. 3, if this is carried out before the ship reaches 15 years) in
accordance with the criteria for longitudinal strength of the ship’s
hull girder for CSR bulk carriers specified in Chapter 13 of CSR.
For further details refer to the LR document Thickness Measurement
and Close-Up Survey Guidance.
6.7.6 Steel
renewal evaluation of corrugated transverse watertight bulkheads on
bulk carriers of 150 m in length and above, intending to carry solid
bulk cargoes having a density of 1,0 t/m3 with
contract for construction on or after 1 July 1998 is to be in accordance
with IACS UR S18. These requirements are not applicable to bulk carriers
with class notation ESN Hold 1 and ESN – All Holds, or ships
built in accordance with the IACS Common Structural Rules (CSR). Further
information is provided in the LR document Thickness Measurement
and Close-Up Survey Guidance.
6.7.8 Where
the gauged thickness is within the range t
net +
0,5 mm and t
net + 1,0 mm, a coating (applied
in accordance with coating manufacturer’s requirements) or annual
gauging may be adopted as an alternative to steel renewal.
6.7.9 Hatch
covers of cargo holds’ steel renewal evaluation of bulk carriers
with contract for construction on or after 1 July 1998 is to be in
accordance with IACS UR S21. These requirements are not applicable
to ships built in accordance with the IACS Common Structural Rules
(CSR). Further information is provided in the LR document Thickness
Measurement and Close-Up Survey Guidance.
6.7.11 Where
the gauged thickness is within the range t
net +
0,5 mm and t
net + 1,0 mm, a coating (applied
in accordance with coating manufacturer’s requirements) or annual
gauging may be adopted as an alternative to steel renewal.
6.7.12 Steel
renewal evaluation of hatch covers and hatch coamings of cargo holds
on bulk carriers and ore carriers with contract for construction on
or after 1 January 2004 is to be in accordance with IACS UR S21. These
requirements are not applicable to ships built in accordance with
the IACS Common Structural Rules (CSR). Further information is provided
in the LR document Thickness Measurement and Close-Up Survey
Guidance.
6.7.14 Where the gauged thickness is within the range t
net + 0,5 mm and t
net + 1,0 mm, a coating (applied in accordance with coating manufacturer’s
requirements) or annual gauging may be adopted as an alternative to steel renewal.
Table 3.6.4 Minimum requirements for thickness
measurement - Single skin and double skin bulk carriers
Special Survey I
(Ships 5 years old)
|
Special Survey III
(Ships 15 years old)
|
Special
Survey IV and subsequent
(Ships 20 years old and
over)
|
| (1)
Suspect areas, as required by the Surveyor. See Note 5.
|
(1) Within the cargo length
area:
(a) Each deck plate outside line of cargo
hatch openings.
(b) 2 transverse sections,
outside line of cargo hatch openings. (A minimum of 1 of the above
transverse sections is to be within 0,5L amidships). See
Notes 2 and 6.
|
(1) Within the cargo length
area:
(a) Each deck plate outside line of cargo
hatch openings.
(b) 3 transverse sections,
outside line of cargo hatch openings. (A minimum of 2 of the above
transverse sections is to be within 0,5L amidships). See
Notes 2 and 6.
(c) Each bottom
plate.
|
| Special Survey II (Ships 10 years old)
|
(2) Measurement, for
general assessment and recording of corrosion pattern, of those structural
members subject to Close-up Survey in accordance with Table 3.6.1 Minimum requirements for Close-up
Survey - Single skin bulk carriers, Table 3.6.2 Minimum requirements for Close-up
Survey - Double skin bulk carriers (excluding ore carriers) or Table 3.6.3 Minimum requirements for Close-up
Survey - Ore carriers. See Notes 3 and 4.
|
(2) Measurement,
for general assessment and recording of corrosion pattern, of those
structural members subject to Close-up Survey in accordance with Table 3.6.1 Minimum requirements for Close-up
Survey - Single skin bulk carriers, Table 3.6.2 Minimum requirements for Close-up
Survey - Double skin bulk carriers (excluding ore carriers) or Table 3.6.3 Minimum requirements for Close-up
Survey - Ore carriers. See Notes 3 and 4.
|
| (1) Within the cargo length
area:
(a) 2 transverse sections of deck plating
outside line of cargo hatch openings. See Note 7.
(2) Measurement, for general assessment and recording
of corrosion pattern, of those structural members subject to Close-up
Survey in accordance with Table 3.6.1 Minimum requirements for Close-up
Survey - Single skin bulk carriers, Table 3.6.2 Minimum requirements for Close-up
Survey - Double skin bulk carriers (excluding ore carriers) or Table 3.6.3 Minimum requirements for Close-up
Survey - Ore carriers. See notes 3 and 4.
(3)Wind and water strakes in way of the
transverse sections considered in item (1).
(4)
Selected wind and water strakes outside the cargo length
area.
|
| (3) All wind and water strakes
within the cargo length area.
(4) Selected wind and
water strakes outside the cargo length area.
(5) Suspect
areas, as required by the Surveyor. See Note 5.
|
(3) All wind and water strakes
over the full length of the ship, port and starboard.
(4) Remaining exposed main deck plates not considered in item
(1) and representative exposed superstructure deck plating (i.e. poop,
bridge and forecastle deck).
(5) All keel plates
outside the cargo length area. Also additional bottom plates in way of
cofferdams. Machinery space and aft end of tanks.
|
|
(5) Suspect areas, as required by the Surveyor.
See Note 5.
|
|
(6)Plating of
sea chests. Also side shell plating in way of overboard discharges, as
considered necessary by the Surveyor.
(7) Suspect
areas, as required by the Surveyor. See Note 5.
|
Note The requirements in this table apply to both single skin
and double skin ships unless stated otherwise.
|
Note
1. For areas in spaces (cargo holds and
water ballast tanks) where coatings are found to be in GOOD condition,
as defined in Pt 1, Ch 3, 1.5 Definitions, the extent of thickness measurement
may be specially considered, but not dispensed with in its entirety.
|
Note
2. Transverse sections should be chosen
where the largest scantling diminution is likely to occur, or as
revealed by deck or bottom plating measurement.
|
|
Note 3. For ships assigned
the notations ESN Hold No1 and ESN All Holds, the corrugated part
of the aft transverse bulkhead of the forward cargo hold is to be subject
to thickness measurement. This is to include each vertical corrugation at
its lower and middle level including shedder plates and gusset plates,
where applicable.
|
Note
4. Single skin bulk carriers contracted
for construction prior to 1 July 1998 are to undergo a re-assessment
of their cargo hold shell frames. The number of shell frames to be
measured is equivalent to the number of shell frames subject to
Close-up survey (see
Table 3.6.1 Minimum requirements for Close-up
Survey - Single skin bulk carriers), with representative
measurements to be taken at specific areas for each frame.
|
|
Note 5. Suspect Areas are
locations showing substantial corrosion and/or are considered by the
surveyor to be prone to rapid wastage.
|
|
Note 6. A transverse section
includes all continuous longitudinal members such as plating,
longitudinals and girders at the deck, sides, bottom, inner bottom,
hopper sides, longitudinal bulkheads, inner sides, top wing inner sides
and bottom of top wing tanks. For transversely framed vessels, a
transverse section includes adjacent frames and their end connections in
way of transverse sections.
|
|
Note 7. Deck Plating outside
line of cargo hatch openings is deck plating between the ship sides and
hatch coamings in the transverse section concerned.
|
Table 3.6.5 Thickness measurement - Single
skin bulk carriers - Shell plating and stiffening, with substantial corrosion
| Structural member
|
Extent
of measurement
|
Pattern
of measurement
|
| (1)
Bottom and side shell plating
|
Suspect
plate plus four adjacent plates
|
5 point
pattern for each panel between longitudinals
|
| (2)
Bottom/side shell longitudinals
|
Minimum of
three longitudinals in way of suspect areas
|
3
measurements in line across web and 3 measurements on flange
|
| (3) Side shell
frames
|
Suspect frame and each
adjacent
|
At each end and
mid-span:
(a) 5 point pattern on both web and
flange
(b) 5 point pattern within 25 mm of
welded attachment to both side shell and hopper sloping plate
|
Table 3.6.6 Thickness measurement - Single
skin bulk carriers - Double bottom and hopper structure, with substantial
corrosion
| Structural member
|
Extent
of measurement
|
Pattern
of measurement
|
| (1)
Inner bottom plating
|
Suspect
plate plus all immediately adjacent plates
|
5 point
pattern for each panel between longitudinals over 1 m length
|
| (2) Inner bottom longitudinals
|
Three
longitudinals in way of plates measured
|
3
measurements in line across web and 3 measurements on flange
|
| (3)
Transverse floors and longitudinal girders
|
Suspect
plates
|
5 point
pattern over approximately 1 m2 of plating
|
| (4) Watertight floors and girders
|
(a) lower 1/3 of tank
(b) upper 2/3 of
tank
|
(a) 5 point pattern over 1 m2 of plating
(b) 5 point pattern alternate plates over 1
m2 of plating
|
| (5)Transverse web frames
|
Suspect
plate
|
5 point pattern over 1
m2 of plating
|
Table 3.6.7 Thickness measurement - Single and
double skin bulk carriers - Transverse bulkheads in cargo holds, with substantial
corrosion
| Structural member
|
Extent
of measurement
|
Pattern
of measurement
|
| (1) Lower stool
|
(a)
Transverse band within 25 mm of welded connection to inner-bottom
|
(a)
5 point pattern between stiffeners over 1 m length
|
|
|
(b) Transverse band within 25 mm of welded connection to shelf
plate
|
(b)
as above
|
| (2)
Transverse bulkhead
|
(a)
Transverse band immediately above lower stool shelf plate
|
(a) 5 point pattern over 1 m length
|
|
|
(b)Transverse band at approximately mid-height
|
(b)
5 point pattern over 1 m2 of plating
|
|
|
(c)Transverse band at part of bulkhead adjacent to upper deck or
below upper stool shelf plate (for those ships fitted with upper
stools)
|
(c)5 point
pattern over 1 m2 of plating
|
Table 3.6.8 Thickness measurement - Single
skin and double skin bulk carriers - Deck structure* with substantial corrosion
| Structural member
|
Extent
of measurement
|
Pattern of measurement
|
| (1) Cross deck plating
|
Suspect
cross deck strip plating
|
5 point
pattern between underdeck stiffeners over 1 m length
|
| (2) Underdeck stiffeners
|
(a)
Transverse members
(b) Longitudinal
member
|
(a)
5 point pattern at each end and mid-span
(b) 5
point pattern on both web and flange
|
| (3)Hatch covers
|
(a)Each side and end plate 3 locations
|
(a)5 point pattern at each location
|
|
|
(b)Hatch cover top plate, 3 longitudinal bands - 2 on outboard
strakes and 1 on centreline strake
|
(b)
5 point measurement at each band
|
| (4)Hatch coamings
|
Each side
and end of coaming, one upper and one lower band
|
5 point
measurement at each band
|
| (5)
Topside salt water ballast tanks
|
(a)
Watertight transverse bulkheads
(i) lower 1/3 of
bulkhead
(ii) upper 2/3 of bulkhead
(iii)stiffeners
|
(i)5 point pattern over 1 m2 of plating
(ii) 5 point pattern over 1 m2 of plating
(iii) 5 point pattern over 1 m length
|
|
|
(b)Swash transverse bulkheads
(i)lower 1/3
of bulkhead
(ii)upper 2/3 of bulkhead
(iii)stiffeners
|
(i)5 point pattern over 1 m2 of plating
(ii) 5 point pattern over 1 m2 of plating
(iii) 5 point pattern over 1 m
length
|
|
|
(c)
3 representative bays of the topside sloping plate
(i)
lower 1/3 of tank
(ii) upper 2/3 of
tank
|
(i)5 point pattern over 1 m2 of plating
(ii)5 point pattern over 1 m2 of plating
|
|
|
(d)
suspect longitudinals and adjacent plates
|
5 point
pattern both web and flange over 1 m length
|
| (6)
Main deck plating
|
Suspect
plates and 4 immediately adjacent plates
|
5 point
pattern over 1m2 of plating
|
| (7)Main deck longitudinals
|
Minimum of
3 longitudinals where plating measured
|
5 point
pattern on both web and flange over 1 m length
|
| (8)
Web frames/transverses
|
Suspect
plates
|
5 point
pattern over 1m2 of plating
|
| *
including cross strips, main cargo hatchways, hatch covers, coamings and
topside tanks
|
Table 3.6.9 Thickness measurement - Double
skin bulk carriers - Double side space structure (including wing void spaces of ore
carriers), with substantial corrosion
| Structural member
|
Extent of
measurement
|
Pattern of
measurement
|
| (1)Bottom, inner bottom and hopper structure plating
|
(a)Minimum of 3 bays across double bottom tank, including aft
bay
|
5 point
pattern for each panel between longitudinals and floors
|
|
|
(b)
Measurements around and under all suction bell mouths
|
|
| (2)Bottom, inner bottom and hopper structure longitudinals
|
Minimum of
3 longitudinals in each bay where bottom plating measured
|
3
measurements in line across flange and
3 measurements on the
vertical web
|
| (3)Bottom girders, including watertight girders
|
At fore and
aft watertight floors and in centre of tanks
|
Vertical
line of single measurements on girder plating with 1 measurement between
each panel stiffener, or a minimum of 3 measurements
|
| (4)
Bottom floors, including watertight floors
|
3 floors in
the bays where bottom plating measured, with measurements at both ends and
middle
|
5 point
pattern over 2 m2 area
|
| (5)
Hopper structure web frame ring
|
3 floors in
bays where bottom plating measured
|
5 point
pattern over 1 m2 of plating and single measurements on flange
|
| (6)Hopper structure transverse watertight bulkhead or swash
bulkhead
|
(a)
lower 1/3 of bulkhead
(b)upper 2/3 of
bulkhead
(c) stiffeners (minimum of
3)
|
(a)5
point pattern over 1 m2 of plating
(b)5
point pattern over 2 m2 of plating
(c)For web, 5 point pattern over span (2 measurements across
web at each end and 1 at centre of span). For flange, single measurements
at each end and centre of span
|
| (7) Panel stiffening
|
Where applicable
|
Single measurements
|
Table 3.6.10 Thickness measurement - Double
skin bulk carriers - Double side space structure (including wing void spaces of ore
carriers), with substantial corrosion
| Structural member
|
Extent of
measurement
|
Pattern of
measurement
|
| (1) Side shell and inner
plating:
(i) Upper strake and strakes in way of
horizontal girders
(ii) All other
strakes
|
(i) Plating between each pair
of transverse frames/longitudinals in a minimum of 3 bays along the tank
(ii) Plating between every third pair of longitudinals
in same 3 bays
|
(i) Single measurement
(ii) Single measurement
|
| (2)Side shell and inner side
transverse frames/longitudinals on:
(i) Upper
strake
(ii) All other strakes
|
(i) Each transverse
frame/longitudinal in same 3 bays
(ii) Every third
transverse frame/ longitudinal in same 3 bays
|
(i) 3 measurements across web
and
1 measurement on flange
(ii)3
measurements across web and
1 measurement on
flange
|
| (3) Transverse
frames/longitudinals - brackets
|
Minimum of 3 at top, middle and bottom
of tank in same 3 bays
|
5 point pattern over area of
bracket
|
| (4) Vertical web and transverse
bulkheads:
(i) Strakes in way of horizontal
girders
(ii) Other strakes
|
(i) Minimum of 2 webs and both
transverse bulkheads
(ii)Minimum of 2 webs and both
transverse bulkheads
|
(i) 5 point pattern over
approx. 2 m2 area
(ii) 2 measurements
between each pair of vertical stiffeners
|
| (5) Horizontal girders
|
Plating on each girder in a minimum of 3
bays
|
2 measurements between each pair of longitudinal
girder stiffeners
|
| (6) Panel stiffening
|
Where applicable
|
Single measurements
|
6.7.15 Prior to any coating or recoating of cargo holds, scantlings are to be
confirmed by a thickness measurement, with the Surveyor in attendance.
|