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 moveable 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
-
.1
Administration means the Government
of the State whose flag the unit is entitled to fly.
-
.2
Coastal State means the Government
of the State exercising administrative control over the drilling operations
of the unit.
1.3.6
Organization means the Inter-Governmental
Maritime Consultative Organization (IMCO).
1.3.7
Certificate means Mobile Offshore
Drilling Unit Safety Certificate.
1.3.10
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 loadings
for which the unit is designed. Drilling operations are assumed to
have been discontinued due to the severity of the environmental loadings.
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.
1.3.11
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.
1.3.12
Length (L) means 96 per cent
of the total length on a waterline at 85 per cent of the least moulded
depth 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.
1.3.13
Weathertight means that in
any sea conditions water will not penetrate into the unit.
1.3.14
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
underway, 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 minimum comfortable conditions
of habitability are in working order and functioning normally; and
-
.2 drilling operations.
1.3.15
Gas-tight door is a solid,
close-fitting door designed to resist the passage of gas under normal
atmospheric conditions.
1.3.16
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.
1.3.17
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.
1.3.18
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.
1.3.19
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 intended
to distribute electrical energy to the emergency services.
1.3.20
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.
1.3.21
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.
1.3.22
Auxiliary steering gear is
that 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.
1.3.23
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.
1.3.24
Maximum ahead service speed is
the greatest speed which the unit is designed to maintain in service
at sea at its deepest seagoing draught.
1.3.25
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.
1.3.26
Machinery spaces of Category A are
all spaces which contain internal combustion type machinery used either:
-
.1 for main propulsion; or
-
.2 for other purposes where such machinery has
in the aggregate a total power of not less than 375 kilowatts, or
which contain any oil-fired boiler or oil fuel unit; and trunks to
such spaces.
1.3.27
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.
1.3.28
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. However, in the application of Chapter
9 the space where the emergency source of power is located
is not considered as being a control station.
1.3.29
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.
1.3.30
-
.1
Enclosed spaces are spaces delineated
by floors, bulkheads and/or decks which may have doors and/or windows.
-
.2
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.
1.3.31
Industrial machinery and components are
the machinery and components which are used in connexion with the
drilling operation.
1.3.32
-
.1
Non-combustible material 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 procedure. Any other material is a combustible
material.
-
.2
A Standard Fire Test is a test
as defined in Regulation 3(b) of Chapter II-2 of the 1974 SOLAS Convention.
-
.3
“A” Class Divisions are
those divisions as defined in Regulation 3(b) of Chapter II-2 of the
1974 SOLAS Convention.
-
.4
"B" Class Divisions are those
divisions as defined in Regulation 3(b) of Chapter II-2 of the 1974
SOLAS Convention.
-
.5
"C” Class Divisions are
those divisions constructed of non-combustible materials approved
by the Administration. They need meet no requirements relative to
the passage of smoke and flame or to the limiting of temperature rise.
-
.6
Steel or other equivalent material means
steel or any material which, by itself or due to insulation provided,
has structural and integrity properties equivalent to steel at the
end of the applicable fire exposure to the standard fire test (e.g.
aluminium alloy with appropriate insulation).
1.3.33
Working spaces are those open
or enclosed spaces containing equipment and processes, associated
with drilling operations, which are not included in 1.3.27.
1.3.34
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.
1.3.35
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.
1.3.36
Fuel oil unit is the equipment
used for the preparation of oil fuel for delivery to an oilfired 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
newtons per square millimetre.
1.3.37
Survival craft are craft capable
of removing persons from a unit to be abandoned and capable of sustaining
persons until retrieval is completed.
1.3.38
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.
1.3.39
Diving system is the plant
and equipment necessary for the safe conduct of diving operations
from a mobile offshore drilling unit.