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The electronic pdf versions of the documents found through http://www.dnv.com/ are the officially binding versions. Copyright Det Norske Veritas.
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DNV-OSS-101 Rules for Classification of Offshore Drilling and Support Units |
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| Ch.1: Position Mooring Systemes for Classification |
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| Sec.3: Classification Scope and Notations |
Ch.1
Ch.1 Sec.3 A
| Hull and main structure | ||||||||||||||
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Ch.1 Sec.3 A
| Marine and machinery installations and equipment | ||||||||||||||||
| Machinery installations and equipment,
including their related auxiliary functions, with respect to strength
and performance as applicable to the following main functions: | ||||||||||||||||
Other installations stated in the rules. |
| — | construction symbol |
| — | main character of class |
| — | basic design notation |
| — | service notation |
| — | special equipment and systems notations (as applicable) |
| — | special feature notations (as applicable). |
will be given to
units built under the supervision of DNV.
will be given to
units built under the supervision of a recognised classification
society and later assigned class with DNV.Ch.1 Sec.3 B
Table B1 Class notations
related to basic design | Class notation | Description | Qualifier | Description | Design requirements | Survey requirements | Column-stabilised | A structure dependent on
the buoyancy of widely spaced columns for floatation and stability
in all modes of operation | | | Ch.2 Sec.1 | Ch.3 | Self-elevating | A structure with hull of
sufficient buoyancy for safe transport which is raised above sea
surface on legs supported by the sea bed during operation | | | Ch.2 Sec.1 | Ch.3 | Ship-shaped | Monohull ship and barge structures having
displacement hulls with or without propulsion machinery | | | Ch.2 Sec.1 | Ch.3 | Mobile Offshore | A structure not properly
characterised by the above notations | | | Ch.2 Sec.1 | Ch.3 | | |||||
Ch.1 Sec.3 B
Table
B2 Class notations related to service | Class notation | Description | Qualifier | Description | Design requirements | Survey requirements | Accommodation | Vessel purpose accommodation | Unit | Mobile offshore unit | Ch.2 Sec.4 | Ch.3 Sec.5 D | Crane | Vessel purpose crane operation | Unit | Mobile offshore unit | Ch.2 Sec.5 | Ch.3 Sec.5 E | DSV | Vessel purpose diving
support | SAT | No restrictions, except those imposed
by the rule requirements | Ch.2 Sec.6
I | Ch.3 Sec.6
I | SURFACE | Maximum operating depth <= 60 m,
maximum operating time <= 8 h | Drilling | Vessel purpose drilling | Unit | Mobile offshore unit | Ch.2 Sec.2 | Ch.3 Sec.5 B | Fire Fighter | Vessel purpose fire
fighting | I | Active protection, giving
the vessel capability to withstand higher heat radiation loads from
external fires. | Ch.2 Sec.6
K | Ch.3 Sec.6
K | II | Continuous fighting of large
fires and cooling of structures. | III | Continues fighting
of large fires and cooling of structures with large water pumping
capacity and comprehensive fire fighting equipment. | Offshore Support | Vessel purpose offshore support | Unit | Mobile offshore unit | NA | Ch.3 Sec.5 F | Well Intervention | Vessel purpose well
intervention | 1 | Excluding risers, i.e. no
circulation of hydrocarbons | Ch.2 Sec.3 | Ch.3 Sec.5
C | 2 | Including risers, i.e. circulation
of hydrocarbons | Unit | Mobile offshore unit | Wind Turbine Installation | Vessel purpose installation
of fixed and floating wind power equipment | Unit | Mobile offshore unit | Ch.2 Sec.7 | NA | | |||||
Ch.1 Sec.3 B
Table
B3 Class notations related to equipment and systems | Class notation | Description | Qualifier | Description | Design requirements | Survey requirements | CLEAN | Arrangements
for controlling and limiting operational emissions and discharges | <none> | Basic operational requirements | Ch.2
Sec.6 S200 | Ch.3
Sec.6 T200 | DESIGN | Additional operational requirements.
Design requirements for protection against accidents and for limiting
their consequences. | COMF | Requirements
for noise, vibration and indoor climate | C(crn) | Indoor climate | Ch.2
Sec.6 P200 | Ch.3
Sec.6 Q | V(crn) | Noise and vibration | crn | comfort rating number,
1, 2 or 3, where 1 is best. | CRANE | Onboard crane | | | Ch.2 Sec.6 H | Ch.3 Sec.6 H | DPS | Dynamic
positioning system | (A) | Annual survey required | Ch.2
Sec.6 C | SHIP
Pt.7 Ch.1 Sec.6 L | 0 | Without redundancy | 1 | With an independent
joystick back-up and a position reference back-up | 2 | With redundancy in
technical design and with an independent joystick back-up | 3 | With redundancy in
technical design and with an independent joystick back-up, plus
a back-up DP-control system in an emergency DP-control centre, designed
with physical separation for components that provide redundancy | DRILL | Drilling plant | | | Ch.2 Sec.6 D | Ch.3 Sec.6 D | DYNPOS | Dynamic
positioning system | (A) | Annual survey required | Ch.2
Sec.6 C | Ch.3
Sec.6 C | AUT | With an independent
joystick back-up and a position reference back-up | AUTR | With redundancy in
technical design and with an independent joystick back-up | AUTRO | With redundancy in
technical design and with an independent joystick back-up, plus
a back-up DP-control system in an emergency DP-control centre, designed
with physical separation for components that provide redundancy | AUTS | Without redundancy | ER | Redundancy in technical
design | E0 | Periodically unattended machinery
space | | | Ch.2 Sec.6 M | Ch.3 Sec.6 K | ECO | Machinery centralised operated | | | Ch.2 Sec.6 M | Ch.3 Sec.6 K | F | Additional
fire protection | A | Accommodation space | Ch.2
Sec.6 J | SHIP
Pt.7 Ch.1 Sec.6 K | M | Machinery space | FMS | Fatigue methodology
for ship-shaped units | | | OSS-102 Ch.2 Sec.6
O | Ch.3 Sec.6 P | HELDK | Helicopter
deck | <none> | Structure | Ch.2
Sec.6 E | Ch.3
Sec.6 E | S | Vessel safety | H | Helicopter safety | HMON | | (...) | See SHIP Pt.6 Ch.11
for qualifier definitions | Ch.2 Sec.6 O | Ch.3 Sec.6 O | ISDS | | (...) | See DNV-OS D203 for
qualifier definitions | Ch.2 Sec.6 T | NA | LCS | Loading computer system | DC | Damage control | Ch.2 Sec.6 L | Ch.3 Sec.6 L | OPP-F | Oil pollution prevention
- fuel systems | | | Ch.2 Sec.6 S100 | NA | POSMOOR | Position
mooring system | <none> | Passive | Ch.2
Sec.6 B | Ch.3
Sec.6 B | ATA | Automatic thruster
assistance | TA | Thruster assistance | V | Vicinity of other structures | Recyclable | Inventory of Hazardous Materials
Part 1 | | | Ch.2 Sec.6 S400 | SHIP Pt.7 Ch.1 Sec.7
K | SBM | Management of safety
and environmental protection in operation | | | Ch.2 Sec.6 R | Ch.3 Sec.6 S | TEMPSTORE | Temporary storage of
oil | | | Ch.2 Sec.6 G | Ch.3 Sec.6 G | VIBR | Vibration level criteria
for machinery, components, equipment and structure | | | Ch.2 Sec.6 P200 | Ch.3 Sec.6 Q | WELL | Well
intervention system | 1 | Vessel mounted system excluding
subsea equipment. | Ch.2
Sec.6 N | Ch.3
Sec.6 N | 2 | Vessel mounted system including
subsea equipment. | WELLTEST | Well test system | | | Ch.2 Sec.6 F | Ch.3 Sec.6 F | | |||||
Optional class notations related to cold climate service are given in Table B4.
Ch.1 Sec.3 B
Table
B4 Class notations related to cold climate operation | Class notation | Description | Qualifier | Description | Design requirements | Survey requirements | DAT | Design ambient air temperature
suitable for regular service during winter to Arctic or Antarctic waters | (-X°C) | Lowest design ambient temperature
for structure in °C. | SHIP Pt.5 Ch.1 Sec.7 | NA | DEICE | De-icing or anti-icing systems | C | Including cargo deck
area | SHIP Pt.6 Ch.1 Sec.5 | Ch.3 Sec.6 L200 | ICE | Navigation
in ice | 05 | Arctic ice rules, ice
thickness 0.5 m, no ramming anticipated | Ch.2
Sec.6 L200 | NA | 10 | Arctic ice rules.,
ice thickness 1.0 m, no ramming anticipated | 15 | Arctic ice rules, ice
thickness 1.5 m, no ramming anticipated | C | Basic ice strengthening | L | Strengthened for operation
in ice-infested waters | T | Strengthened for transit
in ice-infested waters | PC | Polar
Class - navigation in ice-infested polar waters | 1 | Year-round operation
in all polar waters | SHIP
Pt.5 Ch.1 Sec.8 | NA | 2 | Year-round operation
in moderate multi-year ice conditions | 3 | Year-round operation
in second-year ice which may include multi-year ice inclusions | 4 | Year-round operation
in thick first-year ice which may include old ice inclusions | 5 | Year-round operation
in medium first-year ice which may include old ice inclusions | 6 | Summer / autumn
operation in medium first-year ice which may include old ice inclusions | 7 | Summer / autumn
operation in thin first-year ice which may include old ice inclusions | WINTERIZED | Designed
for operation in cold climate | ARCTIC | Requirements for ships
operating in cold climate, with additional requirements for pollution prevention
in vulnerable arctic areas | SHIP
Pt.5 Ch.1 Sec.6 | SHIP
Pt.7 Ch.1 Sec.6 M | BASIC | Requirements for ships
operating in cold climate environments for shorter periods, not
necessarily including ice covered waters | COLD | Requirements for ships
operating in cold climate | t1 | Materials low design
temperature in °C | t2 | Materials extreme low
design temperature in °C | | |||||
Ch.1 Sec.3 B
Table B5 Class notations
related to special features | Class notation | Description | Qualifier | Description | Design requirements | Survey requirements | BIS | Built for in-water survey | | | Ch.2 Sec.6 T600 | NA | INERT | Inert gas system | | | SHIP Pt.5 Ch.3 Sec.11 | NA | NON SELF-PROPELLED | Towing assistance will be
required during transit | | | Ch.2 Sec.6 A | NA | SUB | Resting on seabed | | | Ch.2 Sec.6 T200 | NA | TMON | Tailshaft monitoring | | | Ch.2 Sec.6 T500 | NA | | |||||
The notation R will
be inserted after the main character of class.
Ch.1 Sec.3 B
902 Other service restrictions or operational limits included
in the design assumptions of a unit will be stated in the "Appendix
to the classification certificate", and/or on
special signboards onboard.
Ch.1 Sec.3 B
903 Service restrictions and deviations from the rule requirements
shall be addressed in a memo for owners (MO) informing them about
the assumption for the class notation if the unit shall be operated
outside the geographical areas or other boundaries agreed in the
classification contract.
DRILL(N).
Ch.1 Sec.3 B
1002 Coastal state code notations currently in use, are listed
in Table B6.
Ch.1 Sec.3 B
| Table B6 Notations for coastal state verification | |||
| Notation | Description | ||
| Accommodation Unit(N) | Verified for compliance with DNV's interpretation of relevant Norwegian coastal state requirements. | ||
| Drilling Unit(N) | |||
| Well Intervention Unit(N) | |||
| DRILL(N) | |||
| DRILL(US) | Verified for compliance with DNV's
interpretation of relevant US Outer Continental Shelf | UKVS | Verified for compliance with DNV's
interpretation of relevant UK coastal state requirements. | |
1A1 <service restriction, if any><basic design notation> <service notation>
<special equipment and
systems notations><special feature notations>
Example:
1A1
Column-stabilised Drilling Unit
POSMOOR NON-SELF-PROPELLED.
Ch.1 Sec.3 B
1102 Ship-shaped units may also be assigned relevant class notations
given in the DNV Rules for Classification of Ships.
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