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DNV-OS-D101 Marine and Machinery Systems and Equipment
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Ch.1 Sec.1
D. Definitions
Ch.1 Sec.1
D 100 Verbal forms
Ch.1 Sec.1 D
101 Shall: Indicates requirements
strictly to be followed in order to conform to this standard and
from which no deviation is permitted.
Ch.1 Sec.1 D
102 Should: Indicates that
among several possibilities one is recommended as particularly suitable,
without mentioning or excluding others, or that a certain course
of action is preferred but not necessarily required. Other possibilities
may be applied subject to agreement.
Ch.1 Sec.1 D
103 May: Verbal form used
to indicate a course of action permissible within the limits of
the standard.Ch.1 Sec.1
D 200 Definitions
Ch.1 Sec.1 D
201 Column-stabilised unit: A
unit with the main deck connected to the underwater hull or footings
by columns.
Ch.1 Sec.1 D
202 Engine room: This is
the space containing propulsion machinery and machinery for generation
of electrical power. Rooms within or adjacent to the engine room
with visual contact with the machinery are considered to be part
of the engine room.
Ch.1 Sec.1 D
203 Floating offshore installation: A
buoyant construction engaged in offshore operations including drilling, production,
storage or support functions, and which is designed and built for
installation at a particular offshore location.
Ch.1 Sec.1 D
204 Machinery spaces: All
machinery spaces of category A and all other spaces containing propulsion machinery,
boilers, 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.(SOLAS Reg. II-1/3.16)
Ch.1 Sec.1 D
205 Machinery spaces of category A: Those
spaces and trunks to such spaces which contain:
| — | internal combustion machinery
used for main propulsion; or |
| — | internal combustion machinery used for purposes other
than main propulsion where such machinery has in the aggregate a
total power output of not less than 375 kW; or |
| — | any oil-fired boiler or oil fuel unit. |
(SOLAS Reg. II-1/3.17)
Ch.1 Sec.1 D
206 Machinery Room: Room
in which major items of equipment are installed. The term is used
instead of Machinery Space on installations which are non-self propelled
or fixed. Depending on the equipment involved requirements will
be similar to those for either Machinery
Space or Machinery Space
of Category A.
Ch.1 Sec.1 D
207 Marine piping: Piping
serving the marine systems on an offshore unit and which is not
primarily intended for operation in drilling or hydrocarbon production
service or dedicated auxiliary systems.
Marine piping systems include the following:
| — | ballast system |
| — | bilge system |
| — | drains system |
| — | air/overflow systems |
| — | sounding system |
| — | cooling system |
| — | lubricating oil system |
| — | fuel oil system |
| — | thermal oil system |
| — | feed water and condensate systems |
| — | steam system |
| — | hydraulic system |
| — | pneumatic system |
| — | firewater system. |
Ch.1 Sec.1 D
208 Mobile offshore unit: A
buoyant construction engaged in offshore operations including drilling, production,
storage or support functions, not intended for service at one particular
offshore site and which can be relocated without major dismantling
or modification.
Ch.1 Sec.1 D
209 Offshore installation: A
collective term to cover any construction, buoyant or non-buoyant,
designed and built for installation at a particular offshore location.
Ch.1 Sec.1 D
210 Redundancy: The ability
to maintain or restore a function when one failure has occurred.
Redundancy can be achieved for instance by installation of more
than one unit (component redundancy) or by having two or more separate
systems capable of performing the same function (system redundancy).
Ch.1 Sec.1 D
211 System availability: The
time the system is available.Ch.1 Sec.1 D
| Table D1 System availability |
| System category | Repair time | Continuous availability (R0) | None | | High availability (R1) | 30 s | | Manual system restoration (R2) | 10 minutes | | Repairable systems (R3) | 3 hours | |
See also DNV-OS-D202 Ch.2 Sec.1 B for more detailed definition.
Ch.1 Sec.1 D
212 Self-elevating unit: A
unit with movable legs capable of raising its hull above the surface
of the sea.
Ch.1 Sec.1 D
213 Ship-shaped unit: A
unit with a ship- or barge-type displacement hull of single or multiple
hull construction intended for operation in the floating condition.
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