Section
2 Annual Surveys – Hull and machinery requirements
2.1 General
2.1.1 Annual Surveys are to be held concurrently with statutory annual or other
relevant statutory surveys, wherever practicable.
2.1.2 At Annual Surveys, the Surveyor is to examine the unit and machinery, so
far as necessary and practicable, in order to be satisfied as to their general
condition.
2.1.4 For salt-water ballast tanks, other than independent double bottom tanks,
where a protective coating is found to be in POOR condition, as defined in Pt 1, Ch 3, 1.5 Definitions, and it has not been repaired, where a soft or
semi-hard coating has been applied or where a protective coating was not applied
from the time of construction, maintenance of class will be subject to the spaces in
question being internally examined and gauged as necessary at Annual Surveys.
2.1.5 For independent salt-water double bottom tanks where a protective coating
is found to be in POOR condition, as defined in Pt 1, Ch 3, 1.5 Definitions, and it has not been repaired, where a soft or
semi-hard coating has been applied or where a protective coating was not applied
from the time of construction, maintenance of class may, at the discretion of the
Classification Committee, be subject to the spaces in question being examined and
gauged as necessary at Annual Surveys.
2.2 Structure and equipment
2.2.1 At each Annual Survey the exposed parts of the hull structure, deck,
deck-houses, superstructures and structures attached to the deck, including supports
to drilling/process plant, derrick substructures, crane pedestals and other
supporting structures, accessible internal spaces and the applicable parts listed
under unit types, as specified in 2.2.2 to 2.2.5, are to be generally examined and
the Surveyor is to be satisfied as to their efficient condition.
2.2.2
All unit types. The Surveyor is to be satisfied regarding the efficient
condition of:
- Hatchways, manholes and other openings in freeboard and
superstructure decks or leading into buoyant spaces.
- Machinery casings and covers, companionways, and deck-houses
protecting openings.
- Side scuttles and deadlights, and other openings in hull shell
boundaries or in enclosed superstructures.
- Ventilators and air pipes together with flame screens, fiddley
openings, skylights, flush deck scuttles and overboard discharges from
enclosed spaces. In addition, the Surveyor is to examine externally all air
pipe heads installed on exposed decks.
- Closing appliances for all the above, including check valves,
hatch covers and doors, together with their respective securing devices,
sills, coamings and supports.
- Watertight bulkheads, and end bulkheads of enclosed
superstructures.
- Where applicable, the electrical cables schedule of watertight
penetrations (e.g. cable transit seal systems register) is to be reviewed to
confirm it is being maintained, see
Pt 16, Ch 2, 11.11 Penetration of bulkheads and decks by cables and
Pt 6, Ch 2, 11.11 Penetration of bulkheads and decks by cables
of the Rules and Regulations for the Classification of Ships, July 2022.
- Watertight doors and hatch covers in watertight boundaries,
their indicators and alarms, to be examined and tested (locally and
remotely), together with an examination of watertight boundary penetrations,
so far as is practicable.
- Freeing ports together with bars, shutters and hinges.
- Windlasses and attachment of anchor racks and anchor
cables.
- Protection of the crew, guard-rails, life-lines, gangways and
deck-houses accommodating crew.
- The type, location and extent of corrosion control (i.e.,
coatings, cathodic protection systems, etc.), as well as its effectiveness,
and repairs or renewals should be reported at each survey.
2.2.3
Column-stabilised units and tension-leg units. In addition to the
requirements of Pt 1, Ch 3, 2.2 Structure and equipment 2.2.1 and Pt 1, Ch 3, 2.2 Structure and equipment 2.2.2, the Annual
Survey is to include a complete bracing Close-up Survey, consisting of a detailed
dry examination of all bracings and their structural connections to columns,
pontoons and decks. The following critical regions are to be examined by approved
methods of NDE:
- Primary bracing shell plating, including butts and seams and
welding in way of the toes of both internal and external brackets (i.e.
axial gusset or diaphragm plates and stiffener ends).
- Primary bracing shell plating and welding in way of changes of
section, connections to main structure (e.g. columns, lower hulls, pontoons,
decks, etc.) and intersections with other braces or node fabrications.
- All penetrations and attachments to primary bracings including
drain, vent and access holes, hydrophone mountings, together with edge
reinforcements, attachments for cathodic protection (both sacrificial anodes
and impressed current systems), and guard-rail mountings, eye plates or
lugs, etc.
- Diaphragm, bulkhead or deck plating and welding inside columns,
pontoons or upper hull connection areas, in way of ends of primary bracings,
local shear gussets between adjacent tube ends, and gussets, brackets of
stiffeners forming a continuity of axial members from inside bracings. Also,
column or deck plating and welded connections to bracings in way of internal
diaphragm inside bracing.
- Column connections to pontoons and upper hull structure,
including internal supporting structure, lower hulls, as accessible above
the waterline and or as far as practicable by dry survey methods.
- The structure in way of tether connections on tension-leg units
as far as practicable by dry survey methods. Where significant damage or
deterioration has occurred since the last survey, the scope is to be
increased to include underwater areas at the Surveyor's discretion.
Confirmatory survey of tendon tension monitoring system.
At the first Annual Survey after build, units are subject to examination of major
structural components including NDE of critical areas, see also
Pt 1, Ch 3, 1.6 Planned survey programme and Pt 1, Ch 2, 3.5 Existing installations – Periodical Surveys.
An agreed procedure is to be established for the schedule of extent of
examination and the proportion of NDE required at subsequent surveys, see also Pt 1, Ch 2, 3.5 Existing installations – Periodical Surveys 3.5.11. Specific critical regions are to
be examined by approved methods of NDE. Column structure and upper hull structure
where accessible above the waterline are to be generally examined.
2.2.4
Self-elevating units. In addition to the requirements of Pt 1, Ch 3, 2.2 Structure and equipment 2.2.1 and Pt 1, Ch 3, 2.2 Structure and equipment 2.2.2, the Surveyor
is to be satisfied regarding the efficient condition of:
- Jack-house structures and attachments to upper hull or
platform.
- Locking system.
- Jacking (including pinion, rack gear, etc) or other elevating
systems and leg guides, externally.
- Legs as accessible above the waterline.
- Plating and supporting structure in way of leg wells.
- Drilling derrick support structure.
It is important that an agreed procedure is established for the schedule
of extent of examination and the proportion of NDE required at subsequent surveys,
see also
Pt 1, Ch 2, 3.5 Existing installations – Periodical Surveys 3.5.11. Specific critical regions to be examined by
approved methods of NDE include the following:
- Leg guides and hull support structure.
- Leg well bulkheads below jacking tower or jack-house.
- Connections between jack-house structure and main deck and
underdeck supporting structure.
- The jack-house roof above the jacking machinery (i.e., above the
shock foundation) and in the vicinity of upper guide structure.
- General inspection of bracings, gussets, chord joints and racks
of the legs. Inspection of tubular or similar type legs including pin
holes.
- Leg connections to bottom mats or spud cans.
- Drilling derrick supporting structure.
At the first Annual Survey subsequent to build, units are subject to examination of
major structural components, including NDE of critical areas, see also
Pt 1, Ch 3, 1.6 Planned survey programme and Pt 1, Ch 2, 3.5 Existing installations – Periodical Surveys.
2.2.5
Ship units and other surface type units. The requirements of Pt 1, Ch 3, 2 Annual Surveys - Hull and machinery requirements of the Rules for Ships are to be complied with, as
applicable. The Surveyor is to be satisfied regarding the efficient condition of:
- The hull and deck structure around the drilling wells and
moonpools and in the vicinity of any other structural changes in section,
slots, steps, or openings in the deck or hull and the back-up structure in
way of structural members or sponsons connecting the hull.
2.2.6 The Surveyor is to confirm that an approved Operations Manual and
Construction Portfolio are available on board, see
Pt 3, Ch 1, 3 Operations manual.
2.2.7 Where applicable, the following are to be examined where accessible:
- The hull and deck structure around turret openings and turret
areas.
- Turret bearings and seals.
- Mooring arms and yokes.
- Mooring arm pivots and bearings.
- Process plant support stools and deck structure in way.
- Swivel stack support structure.
- Swivel stack bearing and seals.
- Mooring hawser line and mooring arm attachments to the hull
structure.
- Mooring hawser to buoy.
2.2.8 The Surveyor is to confirm that, where required, an approved loading
instrument, together with its operating instructions, is available on board,
see
Pt 1, Ch 2, 1.4 General 1.4.8 and Pt 1, Ch 2, 1.4 General 1.4.9. The operation of the loading instrument is to be
verified in accordance with LR's certification procedure.
2.2.10 For units fitted with positional mooring equipment in accordance with
Pt 3, Ch 10 Positional Mooring Systems, an initial inspection is to be carried
out following the installation of the positional mooring system, to ensure that the
system has been properly installed, has not suffered damage and, through
confirmation of agreed testing and maintenance procedures, that it continues to
maintain the vessel in the defined safe envelope.
2.2.11 For positional mooring systems, a rota of component parts of the mooring
system is to be examined at each Annual Survey. A periodic inspection program is to
be developed by the Owners/Operators and submitted to LR for approval. Annual
Surveys should be capable of determining as far as practicable the general condition
of the mooring system, including cables, chains, fittings, fairleads, connections
and equipment. The Surveyor is to be satisfied that all components and equipment
remain in an acceptable condition. Particular attention is to be given to the
following:
- Cable or chain in contact with fairleads, etc.
- Cable or chain in way of winches and stoppers (including
underwater stopper if fitted).
- Cable or chain in way of the splash zone.
- Cable or chain anchor line tension alarms are regularly tested
at agreed intervals.
- Cable or chain tensions are regularly logged to confirm that
agreed tensions have not been exceeded.
2.2.12 The Surveyor is to be satisfied regarding the freeboard marks on the
unit's side.
2.2.13 The Surveyor is to be satisfied at each Annual Survey that no material
alterations have been made to the unit, its structural arrangements, mooring system,
subdivision, superstructure, fittings, and closing appliances upon which the
stability approval and load line assignment is based.
2.2.14 The requirements of Pt 1, Ch 3, 3.2 Intermediate Surveys 3.2.3, Pt 1, Ch 3, 3.2 Intermediate Surveys 3.2.4, Pt 1, Ch 3, 5.3 Examination and testing 5.3.6 and Pt 1, Ch 3, 5.3 Examination and testing 5.3.7, regarding the survey of water ballast spaces are
also to be complied with, as applicable.
2.2.15 The Surveyor is to carry out an examination and thickness measurement of
areas identified at the previous Special Survey or Intermediate Survey as having
substantial corrosion. These extended thickness measurements are to be carried out
before the survey is credited as completed see
Pt 1, Ch 3, 5 Special Survey – Hull requirements.
2.2.16 The Survey requirements for sea bed-stabilised units will be specially
considered, but the requirements for column-stabilised and self-elevating units are
to be complied with as applicable.
2.2.17 Survey requirements for units used for the storage of liquefied gas or
chemicals will be specially considered.
2.2.18 Accessible areas on mooring buoys and mooring towers are to be generally
examined.
2.3 Machinery
2.3.1 The main propulsion, essential auxiliary and emergency generators,
including safety arrangements, controls and foundations, are to be generally
examined. Surveyors are to confirm that Periodical Surveys of engines have been
carried out as required by the Rules and that safety devices have been tested.
2.3.2 For units which are disconnectable in order to avoid hazards or extreme
storm conditions, unless agreed otherwise with LR, the Surveyor is to examine and
test in operation all main and auxiliary steering arrangements, including their
associated equipment and control systems, and verify that log book entries have been
made in accordance with statutory requirements, where applicable. For laid-up
machinery, see Section 20.
2.3.3 The Surveyor is to inspect generally the machinery and boiler spaces,
with particular attention being given to the propulsion system, auxiliary machinery,
and any potential fire and explosion hazards. Emergency escape routes are to be
checked to ensure that they are free from obstruction.
2.3.4 The means of communication between the navigating bridge and the
machinery control positions are to be tested.
2.3.5 The bilge pumping systems for each watertight compartment, including
bilge wells, extended spindles, selfclosing drain cocks, valves fitted with rod
gearing or other remote operation, pumps and level alarms, where fitted, are to be
examined and operated as far as practicable and all confirmed to be satisfactory.
Any hand pumps provided are to be included.
2.3.6 Piping systems containing fuel oil, lubricating oil or other flammable
liquids are to be generally examined and operated, as far as practicable, with
particular attention being paid to tightness, fire precaution arrangements, flexible
hoses and sounding arrangements.
2.3.7 The Surveyor is to be satisfied regarding the condition of non-metallic
joints in piping systems which penetrate the hull, where both the penetration and
the nonmetallic joint are below the deepest load waterline.
2.3.8 Boilers and other pressure vessels and their appurtenances, including
safety devices, foundations, controls, relieving gear, high pressure and waste steam
piping insulation and gauges, are to be generally examined. Surveyors are to confirm
that Periodical Surveys of boilers and other pressure vessels have been carried out
as required by the Rules and that the safety devices have been tested. Pressure
vessels for process and drilling plant are to be examined in accordance with Pt 1, Ch 3, 17 Pressure vessels for process and drilling plant.
2.3.9 For boilers, the safety devices are to be tested and the safety valves
are to be operated using the relieving devices. For exhaust gas heated
economisers/boilers, the safety valves are to be tested at sea by the Chief Engineer
and details recorded in the Log Book.
2.3.10 The operation and maintenance records, repair history and feed water
chemistry records of boilers are to be examined.
2.3.11 Gas and crude oil burning systems are to be generally examined and
safety devices tested. Surveyors are to confirm that Periodical Surveys have been
carried out as required by Pt 1, Ch 3, 10 Boilers.
2.3.12 The electrical equipment and cabling forming the main and emergency
electrical installations are to be generally examined under operating conditions, so
far as is practicable. The satisfactory operation of the main and emergency sources
of power and electrical services essential for safety in an emergency is to be
verified; where the sources of power are automatically controlled, they should be
tested in the automatic mode.
2.3.13 Bonding straps for the control of static electricity and earthing
arrangements are to be examined, where fitted.
2.3.14 For units having UMS or CCS notation, a General Examination
of automation equipment is to be carried out. Satisfactory operation of safety
devices and control systems is to be verified.
2.3.15 For units fitted with a dynamic positioning system and/or a
thruster-assisted positional mooring system, the control system and associated
machinery items are to be generally examined and tested under operating conditions
to an approved Test Schedule.
2.3.16 For units fitted with automation equipment for main propulsion, essential
auxiliary and emergency machinery, a general examination of the equipment and
arrangements is to be carried out. Records of changes to the hardware and software
used for controlling and monitoring systems for propelling and essential auxiliary
machinery since the original issue (and their identification) are to be reviewed by
the attending Surveyor. Satisfactory operation of the safety devices and controls
systems is to be verified.
2.3.17 For units fitted with an electronically controlled engine for main
propulsion, essential auxiliary or emergency power purposes, the following is to be
carried out to the satisfaction of the Surveyor:
- Verification of evidence of satisfactory operation of the
engine; where possible, this is to include a running test under load.
- Verification of satisfactory operation of the safety devices
and control, alarm and monitoring systems.
- Verification that any changes to the software or control,
alarm, monitoring and safety systems that affect the operation of the engine
have been assessed by LR and are under configuration management
control.
2.3.18 Dead unit starting arrangements for bringing machinery into operation
without external aid are to be tested to the Surveyor's satisfaction.
2.3.19 Ballast control and indicating systems, along with audible and visual
alarms, are to be examined and tested at both the main control station and each of
the independent local control stations.
2.3.20 For self-elevating units, the jacking gear machinery and associated
control system, including locking devices, are to be generally examined. A planned
cycle is to be agreed with LR for the examination of critical components, i.e.,
pins, flexible hoses, couplings, gear reducers, etc., at each Annual Survey,
supplemented where necessary by NDE, as agreed with LR.
2.3.21 Swivel stack including valves, manifolds and pipe connections are to be
generally examined under working conditions, with special attention to damage due to
mechanical handling, and all seals are to be checked for tightness. Suitable leakage
tests may be carried out at the Surveyor’s discretion and results of the grease
sampling programme provided upon request.
2.3.22 On a single point mooring installation, automatic warning alarms of load
monitoring systems are to be tested.
2.3.23 Where Lithium-Ion battery system installations with total system capacity
exceeding 20 kWh are used as a power source for essential or emergency systems,
testing of the following is to be conducted annually so far as is practicable:
- manual and automatic safety functions; and
- monitoring and control functions.
2.3.24 The safety aspects of spaces or compartments containing Lithium-Ion
batteries used as a power source for essential or emergency systems are to be
examined as applicable to the installation. This could include examinations of:
- structural fire protection;
- fixed fire detection;
- fixed firefighting system(s);
- ventilation and associated dampers;
- off-gas detection, exhaust and/or extraction arrangement;
- integrity of battery crates, trays, boxes, shelves and other structural
parts;
- battery cooling arrangement;
- electrical power cabling, switchgear and converters; and
- EEBD (emergency escape breathing device) and means of escape.
2.4 Safety and communication systems and
hazardous areas
2.4.1 The Surveyor is to be satisfied as to the efficient condition as far as
practicable of the following systems, in accordance with Pt 7 Safety Systems, Hazardous Areas and Fire:
- Fire and gas alarm indication and control systems.
- Systems for broadcasting safety information.
- Protection system against gas ingress into safe areas.
- Protection system against gas escape in enclosed and
semi-enclosed hazardous areas.
- Emergency shut-down (ESD) systems.
- Ventilation arrangements in hazardous areas around turret,
swivel stack and mud processing areas are to be generally examined.
- Protection system against flooding including:
- Water detection alarm systems for watertight bracings,
columns, pontoons, footings, void watertight spaces and chain
lockers.
- Bilge level detection and alarm systems on column-
stabilised units and in machinery spaces on surface type units.
- Remote operation and indication of watertight doors and
hatch covers and other closing appliances.
- Verification of the operation of manual and/or automatic
doors.
- Protection of accommodation areas against the ingress of
smoke.
2.4.2 For units where flammable mixtures are or may be present, a general
examination of electrical equipment located in hazardous areas and spaces is to be
made, to ensure that it is suitable for the application and that the integrity of
safe type electrical equipment has not been impaired due to corrosion, missing
bolts, etc. Cable runs should be examined so far as can be seen for sheath and
armouring defects and to ensure that means of supporting the cable are in good
order. Alarms and interlocks associated with pressurised equipment or spaces are to
be tested for correct operation, see also
Pt 1, Ch 3, 2.2 Structure and equipment 2.2.2.
2.4.3 Satisfactory operation of automatic shut-down devices and alarms is to be
verified.
2.5 Production and oil storage units
2.5.1 For units with crude oil bulk storage tanks, in addition to the
applicable requirements of Pt 1, Ch 3, 2.1 General to Pt 1, Ch 3, 2.4 Safety and communication systems and hazardous areas, the following are to be dealt with where applicable:
- Examination of oil storage tank openings including gaskets,
covers, coamings and screens.
- Examination of oil storage tank pressure/vacuum valves and
flame screens.
- Examination of flame screens on vents to all bunker, oily
ballast and oily slop tanks and void spaces, so far as is practicable.
- Examination of crude oil storage washing, bunker, ballast and
vent piping systems, together with flame arresters and pressure/vacuum
valves, as applicable above the upper deck within the oil storage tank area,
including vent masts and headers.
- Verification that no potential sources of ignition such as
loose gear, excessive products in the bilges, excessive vapours, combustible
materials, etc., are present in or near the oil storage pump-room and that
access ladders are in good condition.
- Examination of all pump-room bulkheads for signs of leakage or
fractures, and in particular, the sealing arrangements of all penetrations
in these bulkheads.
- Verification that the pump-room ventilation system is
operational, ducting intact, dampers operational and screens are clean.
- External examination of the piping and shut-off valves of oil
storage tank and oil storage pump-room fixed firefighting system.
- Verification that the deck foam system and deck deluge system
are in good operating condition.
- Examination of the condition of all piping systems in the oil
storage pump-room so far as is practicable.
- Examination so far as is practicable of oil storage, ballast,
bilges and stripping pumps for excessive gland seal leakage, verification of
proper operation of electrical and mechanical remote operating and shutdown
devices and operation of pump-room bilge system, and checking that pump
foundations are intact.
- Verification that installed pressure gauges on oil discharge
lines and level indicator systems are operational.
- Verification that at least one portable instrument for measuring
flammable vapour concentrations is available, together with a sufficient set
of spares and a suitable means of calibration.
- Examination of any inert gas system, see 2.6.
- For units greater than 15 years of age, all ballast tanks
adjacent (i.e., with a common plane boundary) to a cargo tank with any means
of heating are to be examined. Thickness measurement is to be carried out
where considered necessary by the Surveyor. Special consideration may be
given by the Surveyor to those tanks or spaces where the coatings are found
in GOOD condition, as defined in 1.5, at the previous Intermediate or
Special Survey.
- For ballast tanks, 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 in accordance with Pt 1, Ch 3 Periodical Survey Regulations of the
Rules for Ships, as applicable. The survey will not be considered complete
until these additional thickness measurements have been carried out.
2.5.2 Safety and communication systems and hazardous areas are to be examined
in accordance with 2.4.
2.5.3 For units where the requirements of Pt 1, Ch 2, 1.4 General 1.4.11 are applicable, the arrangements for fire
protection, detection and extinction are to be examined and are to include:
- Verification, so far as is practicable, that no significant
changes have been made to the arrangement of structural fire
protection.
- Verification of the operation of manual and/or automatic doors
where fitted.
- Verification that fire control plans are properly posted.
- Examination, so far as is possible, and testing as feasible, of
the fire and/or smoke detection and alarm system(s).
- Examination of fire main system, and confirmation that each
fire pump, including the emergency fire pump, can be operated separately so
that sufficient water can be produced to meet the greatest calculated demand
in a credible emergency scenario.
- Verification that fire-hoses, nozzles, applicators and spanners
are in good working condition and situated at their respective
locations.
- Examination of fixed fire-fighting systems controls, piping,
instructions and marking, checking for evidence of proper maintenance and
servicing, including date of last systems tests.
- Verification that all portable and semi-portable fire
extinguishers are in their stowed positions, checking for evidence of proper
maintenance and servicing, conducting random checks for evidence of
discharges containers.
- Verification, so far as is practicable, that the remote control
for stopping fans and machinery and shutting off fuel supplies in machinery
spaces and, where fitted, the remote controls for stopping fans in
accommodation spaces and the means of cutting off power to the galley are in
good working order.
- Examination of the closing arrangements of ventilators, funnel
annular spaces, skylights, doorways and tunnels, where applicable.
- Verification that the fireman’s outfits are complete and in good
condition.
- Examination of the electrical installation in areas which may
contain flammable gas or vapour and/or combustible dust to verify that it is
in good condition and has been properly maintained.
2.5.4 For units with production and process plant in which Pt 7, Ch 3 Fire Safety applies, the arrangements for fire protection,
detection and extinction are to be examined and are to include the applicable
requirements of 2.5.3. In addition, the passive fire protection systems to the
topsides process modules and associated plant shall be examined to verify, so far as
practicable, that no significant changes have been made to the arrangement of
structural fire protection.
2.5.6 The Surveyor is to be satisfied as far as is practicable as to the
efficient condition of the following components to the process plant facility
referred to in 2.5.5 as applicable, see also Pt 3, Ch 8 Process Plant Facility:
- Major equipment and structures of the production and process
plant.
- Oil or gas processing system.
- Production plant safety systems.
- Production plant utility systems.
- Relief and flare system.
- Well control system.
- Pressure vessels are to be subject to survey in accordance with
the requirements of Pt 1, Ch 3, 17 Pressure vessels for process and drilling plant, see also 2.5.7.
2.5.7 Selected pressure safety valves are to be bench tested in accordance with
a planned procedure for maintenance and inspection, see 2.5.5.
2.5.8 If the process plant facility is not classed but is certified by LR or
another acceptable organisation, the survey and maintenance records of the process
plant are to be made available to the Surveyor, who is to ensure that the records
are up to date with no outstanding items which could affect the safety of the
unit.
2.6 Inert gas systems
2.6.1 For inert gas systems, where fitted, the following are to be dealt
with:
- External examination of the condition of piping, including vent
piping, above the upper deck in the crude oil storage tank area and
overboard discharges through the shell as far as practicable, together with
components for signs of corrosion or gas leakage/effluent leakage.
- Verification of the proper operation of both inert gas
blowers.
- Checking the scrubber room ventilation system.
- Checking, so far as is practicable, of the deck water seal for
automatic filling and draining and checking for presence of water
carry-over. Checking the operation of the non-return valve.
- Testing of all remotely operated or automatically controlled
valves including the flue gas isolating valve(s).
- Checking the interlocking features of soot blowers.
- Checking the gas pressure regulating valve automatically closes
when the inert gas blowers are secured.
- Checking, so far as is practicable, the following alarms and
safety devices of the inert gas system, using simulated conditions where
necessary:
- High oxygen content of gas in the inert gas main.
- Low gas pressure in the inert gas main.
- Low pressure in the supply to the deck water seal.
- High temperature of gas in the inert gas main.
- Low water pressure to the scrubber.
- Accuracy of portable and fixed oxygen measuring
equipment by means of calibration gas.
- Checking of the interlocking features and positive isolation
for tank isolation.
2.7 Drilling units
2.7.2 The Surveyor is to be satisfied as far as is practicable as to the
efficient condition of the following components of the drilling plant facility
referred to in 2.7.1, as applicable, see also Pt 3, Ch 7 Drilling Plant Facility:
- Blow out preventer hoisting and handling equipment.
- Blow out preventer, diverter and their control systems.
- Choke manifold and associated valves.
- Bulk storage.
- Drilling fluids circulation and cementing equipment.
- Drilling derrick and hoisting, rotation and pipe handling
equipment.
- Heave compensation equipment.
- Miscellaneous drilling equipment and equipment considered as
part of the drilling installation.
- Well testing equipment.
- Well protection valve and control systems.
2.7.5 Selected pressure safety valves are to be bench tested in accordance
with a planned procedure for maintenance and inspection, see 2.7.1.
2.7.6 If a drilling plant facility is not classed but is certified by LR or
another acceptable organisation, the survey and maintenance records of the drilling
plant are to be made available to the Surveyor, who is to ensure that the records
are up to date with no outstanding items which could affect the safety of the
unit.
2.8 Sea Water Desalination Plants and Fresh Water Systems
2.8.1 Offshore units having a FWS notation are to comply with the requirements of
this sub-Section in addition to the applicable requirements of Pt 1, Ch 3, 2.1 General.
2.8.2 The Owner is to submit to LR a plan for cleaning, maintenance and inspection of the
sea water desalination plant, if fitted, and fresh water systems for review and
agreement by LR in advance of the first survey, see
Pt 1, Ch 2, 3.5 Existing installations – Periodical Surveys. The
extent of the survey is to be agreed with LR. A copy is to be kept on board and made
available to the Surveyor. The planned surveys and procedures as agreed by LR will
be subject to revision if found necessary at subsequent surveys or when required by
the Surveyor.
2.8.3 The condition of fresh water storage tanks is to be examined.
2.8.4 Records of potable water quality are to be maintained and are to be made
available to the Surveyor on request. These are to include results of analyses made
by an accredited laboratory to confirm that the water quality meets that defined in
the Pt 5, Ch 26, 1.1 Definitions 1.1.1.(b).
2.8.5 Where sterilisation of potable water systems is carried out by means of
adding chemical germicides e.g. super-chlorination or silvering, records of dosage
and subsequent flushing are to be maintained and are to be made available to the
Surveyor on request, see also
Pt 5, Ch 26, 3.4 Piping system distribution 3.4.8.
2.8.6 Records of cleaning, maintenance and inspection of the sea water desalination plant,
if fitted, and fresh water systems are to be maintained and are to be made available
to the Surveyor on request.
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