For the purpose of this Code, unless expressly provided
otherwise, the terms used therein have the meanings defined in the
following paragraphs.
1.3.1
Mobile offshore drilling unit
or
unit
is a vessel capable of engaging in drilling operations
for the exploration for or exploitation of resources beneath the sea-bed
such as liquid or gaseous hydrocarbons, sulphur or salt.
1.3.2
Surface unit
is
a unit with a ship- or barge-type displacement hull of single or multiple
hull construction intended for operation in the floating condition.
1.3.3
Self-elevating unit
is
a unit with movable legs capable of raising its hull above the surface
of the sea.
1.3.4
Column-stabilized
unit
is a unit with the main deck connected to the underwater hull or footings
by columns or caissons.
1.3.5
Administration
means
the Government of the State whose flag the unit is entitled to fly.
1.3.6
Coastal State
means
the Government of the State exercising administrative control over
the drilling operations of the unit.
1.3.7
Organization
means
the International Maritime Organization (IMO).
1.3.8
Certificate
means
Mobile Offshore Drilling Unit Safety Certificate.
1.3.9
1974 SOLAS Convention
means
the International Convention for the Safety of Life at Sea, 1974,
as amended.
1.3.10
1966 Load Line Convention
means
the International Convention on Load Lines, 1966.
1.3.11
Mode of operation means a
condition or manner in which a unit may operate or function while
on location or in transit. The modes of operation of a unit include
the following:
-
.1
Operating conditions - conditions
wherein a unit is on location for the purpose of conducting drilling
operations, and combined environmental and operational loadings are
within the appropriate design limits established for such operations.
The unit may be either afloat or supported on the sea-bed, as applicable.
-
.2
Severe storm conditions - conditions
wherein a unit may be subjected to the most severe environmental loading
for which the unit is designed. Drilling operations are assumed to
have been discontinued due to the severity of the environmental loading.
The unit may be either afloat or supported on the sea-bed, as applicable
.
-
.3
Transit conditions - conditions
wherein a unit is moving from one geographical location to another.
1.3.12
Freeboard
is
the distance measured vertically downwards amidships from the upper
edge of the deck line to the upper edge of the related load line.
1.3.13
Length (L)
means
96% of the total length on a waterline at 85% of the least moulded
depth (D) measured from the top of the keel, or the length from the
foreside of the stem to the axis of the rudder stock on that waterline,
if that be greater. In units designed with a rake of keel the waterline
on which this length is measured should be parallel to the designed
waterline.
1.3.14
Weathertight
means
that in any sea conditions water will not penetrate into the unit.
1.3.15
Watertight
means
the capability of preventing the passage of water through the structure
in any direction under a head of water for which the surrounding structure
is designed.
1.3.16
Downflooding
means
any flooding of the interior of any part of the buoyant structure
of a unit through openings which cannot be closed watertight or weathertight,
as appropriate, in order to meet the intact or damage stability criteria,
or which are required for operational reasons to be left open.
1.3.17
Normal operational and habitable
conditions
means:
-
.1 conditions under which the unit as a whole,
its machinery, services, means and aids ensuring safe navigation when
under way, safety when in the industrial mode, fire and flooding safety,
internal and external communications and signals, means of escape
and winches for rescue boats, as well as the means of ensuring the
minimum comfortable conditions of habitability, are in working order
and functioning normally; and
-
.2 drilling operations.
1.3.18
Gas-tight door
is
a solid, close-fitting door designed to resist the passage of gas
under normal atmospheric conditions.
1.3.19
Main source of electrical power
is
a source intended to supply electrical power for all services necessary
for maintaining the unit in normal operational and habitable conditions.
1.3.20
Dead ship condition
is
the condition under which the main propulsion plant, boilers and auxiliaries
are not in operation due to the absence of power.
1.3.21
Main switchboard
is
a switchboard directly supplied by the main source of electrical power
and intended to distribute electrical energy to the unit's services.
1.3.22
Emergency switchboard
is
a switchboard which, in the event of failure of the main system of
electrical power supply, is directly supplied by the emergency source
of electrical power and/or the transitional source of emergency power
and is intended to distribute electrical energy to the emergency services.
1.3.23
Emergency source of electrical
power
is a source of electrical power intended to supply
the necessary services in the event of failure of the main source
of electrical power.
1.3.24
Main steering gear
is
the machinery, the steering gear power units, if any, and ancillary
equipment and the means of applying torque to the rudder stock, e.g.
tiller or quadrant, necessary for effecting movement of the rudder
for the purpose of steering the unit under normal service conditions.
1.3.25
Auxiliary steering gear
is
the equipment which is provided for effecting movement of the rudder
for the purpose of steering the unit in the event of failure of the
main steering gear.
1.3.26
Steering gear power unit
means,
in the case of:
-
.1 electric steering gear, an electric motor and
its associated electrical equipment;
-
.2 electrohydraulic steering gear, an electric
motor and its associated electrical equipment and connected pump;
-
.3 other hydraulic gear, a driving engine and
connected pump.
1.3.27
Maximum ahead service speed
is
the greatest speed which the unit is designed to maintain in service
at sea at its deepest seagoing draught.
1.3.28
Maximum astern speed
is
the speed which it is estimated the unit can attain at the designed
maximum astern power at its deepest seagoing draught.
1.3.29
Machinery spaces of category
A
are all spaces which contain internal combustion-
type machinery used either:
or which contain any oil-fired boiler or oil fuel unit; and
trunks to such spaces.
1.3.30
Machinery spaces
are
all machinery spaces of category A and all other spaces containing
propelling machinery, boilers and other fired processes, oil fuel
units, steam and internal combustion engines, generators and major
electrical machinery, oil filling stations, refrigerating, stabilizing,
ventilation and air-conditioning machinery and similar spaces; and
trunks to such spaces.
1.3.31
Control stations
are
those spaces in which the unit's radio or main navigating equipment
or the emergency source of power is located or where the fire recording
or fire control equipment or the dynamical positioning control system
is centralized or where a fire-extinguishing system serving various
locations is situated. In the case of columnstabilized units a centralized
ballast control station is a "control station". However, for purposes
of the application of chapter 9, the space where the emergency source
of power is located is not considered as being a control station.
1.3.32
Hazardous areas
are
all those areas where, due to the possible presence of a flammable
atmosphere arising from the drilling operations, the use without proper
consideration of machinery or electrical equipment may lead to fire
hazard or explosion.
1.3.33
Enclosed spaces
are
spaces delineated by floors, bulkheads and/or decks which may have
doors or windows.
1.3.34
Semi-enclosed locations
are
locations where natural conditions of ventilation are notably different
from those on open decks due to the presence of structures such as
roofs, windbreaks and bulkheads and which are so arranged that dispersion
of gas may not occur.
1.3.35
Industrial machinery and components
are the machinery and components which are used in
connection with the drilling operation.
1.3.36
Non-combustible materialfootnote
means a material which neither
burns nor gives off flammable vapours in sufficient quantity for self-ignition
when heated to approximately 750°C, this being determined to the
satisfaction of the Administration by an established test procedurefootnote. Any other material is a combustible material.
1.3.37
A standard fire test
is
a test as defined in regulation II-2/3.2 of the 1974 SOLAS Convention.
1.3.38
"A" class divisions
are
those divisions as defined in regulation II-2/3.3 of the 1974 SOLAS
Convention.
1.3.39
"B" class divisions
are
those divisions as defined in regulation II-2/3.4 of the 1974 SOLAS
Convention.
1.3.40
"C" class divisions
are
divisions constructed of approved non-combustible materials. They
need meet neither requirements relative to the passage of smoke and
flame nor limitations relative to the temperature rise.
1.3.41
Steel or equivalent material
.
Where the words "steel or equivalent material" occur, "equivalent
material" means any non-combustible material which, by itself or due
to insulation provided, has structural and integrity properties equivalent
to steel at the end of the applicable standard fire test (e.g. aluminium
alloy with appropriate insulation).
1.3.42
Low flame spread
means
that the surface thus described will adequately restrict the spread
of flame, this being determined to the satisfaction of the Administration
by an established test procedure.
1.3.43
Continuous "B" class ceilings or
linings are those "B" class ceilings or linings which terminate
only at an "A" or "B" class division.
1.3.44
Working spaces are those open
or enclosed spaces containing equipment and processes, associated
with drilling operations, which are not included in 1.3.30 or 1.3.32.
1.3.45
Accommodation spaces
are
those used for public spaces, corridors, lavatories, cabins, offices,
hospitals, cinemas, games and hobbies rooms, pantries containing no
cooking appliances and similar spaces. Public spaces are those portions
of the accommodation which are used for halls, dining rooms, lounges
and similar permanently enclosed spaces.
1.3.46
Service spaces
are
those used for galleys, pantries containing cooking appliances, lockers
and store-rooms, workshops other than those forming part of the machinery
spaces, and similar spaces and trunks to such spaces.
1.3.47
Fuel oil unit
is
the equipment used for the preparation of oil fuel for delivery to
an oil-fired boiler, or equipment used for the preparation for delivery
of heated oil to an internal combustion engine, and includes any oil
pressure pumps, filters and heaters dealing with oil at a pressure
more than 0.18 N/mm2
1.3.48
Survival craft
are
craft capable of removing persons from a unit to be abandoned and
capable of sustaining persons until retrieval is completed.
1.3.49
Rescue boat
is
an easily manoeuvred power boat capable of rapid launching and adequate
for quick recovery of a man overboard and towing a liferaft away from
immediate danger.
1.3.50
Diving system
is
the plant and equipment necessary for the safe conduct of diving operations
from a mobile offshore drilling unit.
1.3.51
Anniversary date
means
the day and month of each year which will correspond to the date of
expiry of the certificate.