5 Preparations for Survey
5.1 Survey Programme
5.1.1 A specific survey programme should be worked
out in advance of the renewal survey by the owner in co-operation
with the Administration. The survey programme should be in a written
format based on the information in Annex 6A. The survey should not
commence until the survey programme has been agreed.
5.1.1.1 Prior to the development of the survey
programme, the survey planning questionnaire should be completed by
the owner based on the information set out in Annex 6B, and forwarded
to the Administration."
5.1.2 In developing the survey programme, the
following documentation should be collected and consulted with a view
to selecting tanks, areas, and structural elements to be examined:
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.1 survey status and basic ship information;
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.2 documentation on board, as described in 6.2
and 6.3;
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.3 main structural plans of cargo and ballast
tanks (scantlings drawings), including information regarding use of
high-tensile steels (HTS);
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.4 Condition Evaluation Report, according to annex
9;
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.5 relevant previous damage and repair history;
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.6 relevant previous survey and inspection reports
from both the recognized organization and the owner;
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.7 cargo and ballast history for the last 3 years,
including carriage of cargo under heated conditions;
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.8 details of the inert gas plant and tank cleaning
procedures;
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.9 information and other relevant data regarding
conversion or modification of the ship's cargo and ballast tanks since
the time of construction;
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.10 description and history of the coating and
corrosion protection system (including anodes and previous class notations),
if any;
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.11 inspections of the Owner's personnel during
the last 3 years with reference to structural deterioration in general,
leakages in tank boundaries and piping and condition of the coating
and corrosion protection system (including anodes) if any. A guidance
for reporting is shown in annex 5;
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.12 information regarding the relevant maintenance
level during operation including port state control reports of inspection
containing hull related deficiencies, Safety Management System non-conformities
relating to hull maintenance, including the associated corrective
action(s); and
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.13 any other information that will help identify
suspect areas and critical structural areas.
5.1.3 The submitted survey programme should account
for and comply, as a minimum, with the requirements of 2.6 and annexes
1, 2 and 3 for close-up survey, thickness measurement and tank testing,
respectively, and should include relevant information including at
least:
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.1 basic ship information and particulars;
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.2 main structural plans of cargo and ballast
tanks (scantling drawings), including information regarding use of
high tensile steels (HTS);
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.3 arrangement of tanks;
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.4 list of tanks with information on their use,
extent of coatings and corrosion protection systems;
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.5 conditions for survey (e.g., information regarding
tank cleaning, gas freeing, ventilation, lighting, etc.);
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.6 provisions and methods for access to structures;
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.7 equipment for surveys;
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.8 identification of tanks and areas for close-up
survey (see 2.4);
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.9 identification of areas and sections for thickness
measurement (see 2.5);
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.10 identification of tanks for tank testing (see
2.6);
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.11 identification of the thickness measurement
company;
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.12 damage experience related to the ship in question;
and
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.13 critical structural areas and suspect areas,
where relevant.
5.1.4 The Administration will advise the owner
of the maximum acceptable structural corrosion diminution levels applicable
to the vessel.
5.1.5 Use may also be made of the Guidelines for
technical assessment in conjunction with planning for enhanced surveys
of tankers, contained in annex 11, These Guidelines are a recommended
tool which may be invoked at the discretion of the Administration,
when considered necessary and appropriate, in conjunction with the
preparation of the required survey programme.
5.2 Conditions for Survey
5.2.1 The owner should provide the necessary facilities
for a safe execution of the survey.
5.2.1.1 In order to enable the attending surveyors
to carry out the survey, provisions for proper and safe access should
be agreed between the owner and the Administration.
5.2.1.2 Details of the means of access should
be provided in the survey planning questionnaire.
5.2.1.3 In cases where the provisions of safety
and required access are judged by the attending surveyors not to be
adequate, the survey of the spaces involved should not proceed."
5.2.2 Tanks and spaces should be safe for access.
Tanks and spaces should be gas free and properly ventilated. Prior
to entering tank, void or enclosed space, it should be verified that
the atmosphere in that space is free from hazardous gas and contains
sufficient oxygen.
5.2.3 Tanks and spaces should be sufficiently
clean and free from water, scale, dirt, oil residues, sediments, etc.,
to reveal corrosion, deformation, fractures, damages or other structural
deterioration as well as the condition of the coating. In particular
this applies to areas which are subject to thickness measurements.
5.2.4 Sufficient illumination should be provided
to reveal corrosion, deformation, fractures, damages or other structural
deterioration as well as the condition of the coating.
5.2.5 The surveyor(s) should always be accompanied
by at least one responsible person, assigned by the owner, experienced
in tank and enclosed spaces inspection. In addition a backup team
of at least two experienced persons should be stationed at the hatch
opening of the tank or space that is being surveyed. The back-up team
should continuously observe the work in the tank or space and should
keep lifesaving and evacuation equipment ready for use.
5.2.6 A communication system should be arranged
between the survey party in the tank or space being examined, the
responsible officer on deck and, as the case may be, the navigation
bridge. The communication arrangements should be maintained throughout
the survey."
5.3 Access to Structures
5.3.1 For overall survey, means should be provided
to enable the surveyor to examine the structure in a safe and practical
way.
5.3.2 For close-up survey, one or more of the
following means for access, acceptable to the surveyor, should be
provided:
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.1 permanent staging and passages through structures
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.2 temporary staging and passages through structures
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.3 lifts and moveable platforms
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.4 boats or rafts
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.5 portable ladders
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.6 other equivalent means.
5.4 Equipment for Survey
5.4.1 Thickness measurement should normally be
carried out by means of ultrasonic test equipment. The accuracy of
the equipment should be proven to the surveyor as required.
5.4.2 One or more of the following fracture detection
procedures may be required if deemed necessary of the surveyor:
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.1 radiographic equipment
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.2 ultrasonic equipment
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.3 magnetic particle equipment
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.4 dye penetrant
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.5 other equivalent means.
"5.4.3 Explosimeter, oxygen-meter, breathing apparatus,
lifelines, riding belts with rope and hook and whistles together with
instructions and guidance on their use should be made available during
the survey. A safety check-list should be provided.
5.4.4 Adequate and safe lighting should be provided
for the safe and efficient conduct of the survey.
5.4.5 Adequate protective clothing should be made
available and used (e.g. safety helmet, gloves, safety shoes, etc)
during the survey.
5.5 Survey at Sea or at Anchorage
5.5.1 Survey at sea or at anchorage may be accepted
provided the surveyor is given the necessary assistance from the personnel
on board. Necessary precautions and procedures for carrying out the
survey should be in accordance with 5.1, 5.2, 5.3 and 5.4.
5.5.2 A communication system should be arranged
between the survey party in the tank and the responsible officer on
deck. This system should also include the personnel in charge of ballast
pump handling if boats or rafts are used.
5.5.3 Surveys of tanks by means of boats or rafts
may only be undertaken with the agreement of the surveyor, who should
take into account the safety arrangements provided, including weather
forecasting and ship response in reasonable sea conditions.
5.5.4 When rafts or boats will be used for close-up
survey the following conditions should be observed:
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.1 only rough duty, inflatable rafts or boats,
having satisfactory residual buoyancy and stability even if one chamber
is ruptured, should be used;
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.2 the boat or raft should be tethered to the
access ladder and an additional person should be stationed down the
access ladder with a clear view of the boat or raft;
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.3 appropriate lifejackets should be available
for all participants;
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.4 the surface of water in the tank should be
calm (under all foreseeable conditions the expected rise of water
within the tank should not exceed 0.25 m) and the water level either
stationary or falling. On no account should the level of the water
be rising while the boat or raft is in use;
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.5 the tank or space must contain clean ballast
water only. Even a thin sheen of oil on the water is not acceptable;
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.6 at no time should the water level be allowed
to be within 1 m of the deepest under deck web face flat so that the
survey team is not isolated from a direct escape route to the tank
hatch. Filling to levels above the deck transverses should only be
contemplated if a deck access manhole is fitted and open in the bay
being examined, so that an escape route for the survey party is available
at all times. Other effective means of escape to the deck may be considered;
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.7 if the tanks (or spaces) are connected by a
common venting system, or Inert Gas system, the tank in which the
boat or raft should be used should be isolated to prevent a transfer
of gas from other tanks (or spaces).
5.5.5 Rafts or boats alone may be allowed for
inspection of the under deck areas for tanks or spaces if the depth
of the webs is 1.5 m or less.
5.5.6 If the depth of the webs is more than 1.5
m, rafts or boats alone may be allowed only:
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.1 when the coating of the under deck structure
is in GOOD condition and there is no evidence of wastage; or
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.2 if a permanent means of access is provided
in each bay to allow safe entry and exit. This means of access should
be direct from the deck via a vertical ladder with a small platform
fitted approximately 2 m below the deck. Other effective means of
escape to the deck may be considered.
If neither of the above conditions are met, then staging or
other equivalent means should be provided for the survey of the under
deck areas.
5.5.7 The use of rafts or boats alone in 5.5.5
and 5.5.6 does not preclude the use of boats or rafts to move about
within a tank during a survey.
5.6 Survey planning meeting
5.6.1 Proper preparation and close co-operation
between the attending surveyor(s) and the owner's representatives
onboard prior to and during the survey are an essential part in the
safe and efficient conduct of the survey. During the survey on board
safety meetings should be held regularly.
5.6.2 Prior to commencement of any part of the
renewal and intermediate survey, a survey planning meeting should
be held between the attending surveyor(s), the owner's representative
in attendance, the thickness measurement company operator (as applicable)
and the master of the ship for the purpose to ascertain that all the
arrangements envisaged in the survey programme are in place, so as
to ensure the safe and efficient conduct of the survey work to be
carried out.
5.6.3 The following is an indicative list of items
that should be addressed in the meeting:
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.1 schedule of the vessel (i.e. the voyage, docking
and undocking manoeuvres, periods alongside, cargo and ballast operations,
etc.);
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.2 provisions and arrangements for thickness measurements
(i.e. access, cleaning/de-scaling, illumination, ventilation, personal
safety);
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.3 extent of the thickness measurements;
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.4 acceptance criteria (refer to the list of minimum
thicknesses);
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.5 extent of close-up survey and thickness measurement
considering the coating condition and suspect areas/areas of substantial
corrosion;
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.6 execution of thickness measurements;
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.7 taking representative readings in general and
where uneven corrosion/pitting is found;
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.8 mapping of areas of substantial corrosion;
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.9 communication between attending surveyor(s)
the thickness measurement company operator(s) and owner representative(s)
concerning findings."
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