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RULES FOR CLASSIFICATION
Edition October 2015
Part 1 General regulations
Chapter 2 Class notations
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CHANGES CURRENT
Part 1 Chapter 2 Changes - current
This is a new document.
The rules enter into force 1 January 2016.
Rules for classification: Ships DNVGL-RU-SHIP-Pt1Ch2. Edition October 2015 Page 3
Class notations
Part 1 Chapter 2 Contents
Changes current...................................................................................................... 3
Section 1 Class notations........................................................................................... 6
1 General................................................................................................... 6
1.1 Introduction.........................................................................................6
Section 2 Construction symbol and Main Class Notation............................................ 8
1 Construction symbols............................................................................. 8
1.1 General............................................................................................... 8
2 Main Class Notation................................................................................ 8
Section 3 Ship type notations.................................................................................... 9
1 Introduction............................................................................................9
2 Dry cargo ships...................................................................................... 9
3 Container ships..................................................................................... 11
4 RO/RO ships......................................................................................... 11
5 Passenger ships.................................................................................... 12
6 Oil tankers............................................................................................ 12
7 Chemical tankers.................................................................................. 13
8 Liquefied gas tankers........................................................................... 14
9 Compressed gas tankers.......................................................................14
10 Offshore service vessels..................................................................... 15
11 Vessels for special operations............................................................ 16
12 Non-self-propelled vessels..................................................................19
13 Fishing vessels....................................................................................20
14 Naval vessels...................................................................................... 20
Section 4 Additional class notations.........................................................................21
1 Introduction..........................................................................................21
1.1 General............................................................................................. 21
2 Structural strength and integrity.......................................................... 21
3 Propulsion, power generation and auxiliary systems............................ 26
4 Navigation and manoeuvring................................................................ 29
5 Cargo operations.................................................................................. 31
6 Equipment and design features............................................................ 34
7 Cold climate.......................................................................................... 38
8 Environmental protection and pollution control.................................... 40
9 Living and working conditions.............................................................. 41
10 Survey arrangements..........................................................................42
11 Naval...................................................................................................45
11.1 General........................................................................................... 45
Section 5 Service area..............................................................................................46
1 Service area notation........................................................................... 46
SECTION 1 CLASS NOTATIONS
Part 1 Chapter 2 Section 1
1.1.1 All vessels classed with the Society may be assigned
construction symbol
main class notation
ship type notation
additional Class Notation
service area notation
as applicable.
1.1.2 Class notations are assigned in order to determine applicable rule requirements for assignment and
retention of class. Applicable class notations are given in Sec.2 to Sec.5.
1.1.3 Class notations are either mandatory or optional. The mandatory class notations are indicated in the
Tables given in Sec.2 to Sec.5.
1.1.4 In accordance with Ch.1 Sec.1 [2.2.5] optional class notations from the Society's other rule books
may, upon special consideration, be assigned to a vessel complying with those rules.
1.1.5 Class notations may be given one or more qualifiers which are supplementary symbols used to identify
variants of the class notation or a design parameter. Qualifiers typically denote differences in levels of
complexity and/or special requirements or limitations, and may be assigned additional requirements.
Qualifiers follow immediately after a class notation and are indicated in parenthesis. Multiple qualifiers are
separated by comma and space.
1.1.6 Class notations and qualifiers are shown in bold. See Table 1 for examples of class notations and
qualifiers.
1.1.7 The Tables in Sec.2 to Sec.5 include the following information:
name of class notation
indication of class notation being mandatory
reference to design requirements*
reference to survey requirements for Fleet in Service (FiS)*)
qualifiers as relevant
purpose of class notation
application, giving additional information on when and/or where a class notation can be applied and/or
under what condition a class notation is mandatory.
* NA indicates no requirements.
1.1.8 Examples of typical class notations are shown in Table 1.
Table 1 Examples of class notations
Example 1 Example 2 Example 3
Construction symbol (see Sec.2 [1])
Main Class Notation (see Sec.2 [2]) 1A 1A 1A
Offshore service
Ship type notations (see Sec.3) Container ship Tanker for oil
vessel(Supply)
Additional Class Notations (see Sec.4):
Related to structural strength and integrity CSR Strengthened(DK)
Related to propulsion, power generation and
E0 E0 E0
auxiliary systems
Related to navigation and manoeuvring NAUT(AW, ICS) NAUT(OSV)
Related to cargo operation RSCS Bow loading
Related to equipment and design features DG LFL HELDK(S, H) SF
Ice(1A)
Related to cold climate Ice(E)
Winterized(Basic)
Related to environmental protection and
Clean Clean(Design)
Related to survey arrangement BIS TMON ESP TMON
SECTION 2 CONSTRUCTION SYMBOL AND MAIN CLASS NOTATION
1 Construction symbols
1.1.1 The construction symbol will be assigned to vessels built under the supervision of the Society.
1.1.2 The construction symbol will be assigned to vessels built under the supervision of a classification
society recognized by the Society and later assigned class with the Society. For such vessels the class
notations which the Society considers to have the equivalent intent will be assigned.
1.1.3 Vessels other than those described in [1.1.1] and [1.1.2] will not be assigned a construction symbol
when classed with the Society.
2 Main Class Notation
2.1.1 The main class notation 1A will be assigned to vessels with hull, machinery, systems and equipment
found to be in compliance with applicable rule requirements as given in Pt.2, Pt.3 and Pt.4.
2.1.2 The main class notation 1A will also be assigned to vessels designed and constructed in accordance
with the rules of another classification society, and later assigned class with the Society.
SECTION 3 SHIP TYPE NOTATIONS
1.1.1 Vessels that comply with requirements defined in Pt.5 may be given a ship type notation as indicated
in Table 1 to Table 13 of this section.
1.1.2 A vessel may be assigned more than one ship type notation provided that the respective requirements
are met.
1.1.3 Certain ship type notations are mandatory based on e.g.:
type of cargo
the ability to execute special operations.
2 Dry cargo ships
Table 1 Ship type notations for dry cargo ships
Class Notation Qualifier Purpose Application
General dry cargo ship
Mandatory for ships
occasionally carrying
Design requirements: Carriage of unitized and dry dry cargo in bulk, unless
Pt.5 Ch.1 Sec.5 bulk cargo ship type notation Multi-
purpose dry cargo ship is
FiS survey requirements:
Pt.7 Ch.1 Sec.2, Pt.7 Ch.1
Sec.3, and Pt.7 Ch.1 Sec.4
Multi-purpose dry cargo
Yes occasionally carrying dry
Carriage of unitized and dry
Design requirements: <None> cargo in bulk, unless ship
bulk cargo
Pt.5 Ch.1 Sec.5 type notation General dry
cargo ship is assigned
Bulk carrier Mandatory for sea-going
single deck ships with
cargo holds of single
Yes and/or double side skin
Design requirements: construction, with a double
<None> Carriage of dry bulk cargo
Pt.5 Ch.1 Sec.6 bottom, hopper side tanks
and top-wing tanks fitted
below the upper deck, and
Pt.7 Ch.1 Sec.2, Pt.7 Ch.1 intended for the carriage of
Sec.3, and Pt.7 Ch.1 Sec.4 solid bulk cargoes
Ore carrier
Mandatory for sea-going
single deck ships having
Yes two longitudinal bulkheads
Design requirements: Carriage of ore cargo in dry and a double bottom
Pt.5 Ch.1 Sec.7 bulk throughout the cargo
region, and intended for
carrying ore cargoes in the
Pt.7 Ch.1 Sec.2, Pt.7 Ch.1 centre hold only
X carrier
Mandatory: Mandatory unless ship type
Yes notation Bulk carrier
is assigned. X denotes
Design requirements: Specialised for the carriage
<None> type of bulk cargo to be
Pt.5 Ch.1 Sec.8 of a single type of dry bulk.
carried, limited to either,
FiS survey requirements: Woodchips, Cement, Fly
Pt.7 Ch.1 Sec.2, Pt.7 Ch.1 ash, or sugar
Great lakes bulk carrier
Designed to operate within
Yes the limits of the Great
Design requirements: Lakes and St. Lawrence
Pt.5 Ch.1 Sec.9 river to the seaward limits
defined by the Anticosti
Rules for classification: Ships DNVGL-RU-SHIP-Pt1Ch2. Edition October 2015 Page 10
3 Container ships
Table 2 Ship type notation for container ships
Container ship
Ships exclusively intended
Yes for the carriage of
Design requirements: containers. Carriage of
<None> Carriage of containers
Pt.5 Ch.2 break bulk on inner bottom
may be accepted in special
4 RO/RO ships
Table 3 Ship type notations for RO/RO ships
RO/RO ship
Loading and unloading the
Design requirements:
<None> cargo by Roll on/ Roll off
Pt.5 Ch.3 (RO/RO)
Car carrier
<None> Carriage of vehicles
Pt.5 Ch.3
5 Passenger ships
Table 4 Ship type notations for passenger ships
Passenger ship
<None> Carriage of passenger More than 12 passengers
Ferry More than 12 passengers
Carriage of passengers and
Mandatory: A and vehicles on enclosed
vehicles.
Design requirements: More than 12 passengers
Pt.5 Ch.4 and vehicles on weather
FiS survey requirements: B decks only. Requires
service area restriction R2
or stricter
6 Oil tankers
Table 5 Ship type notations for oil tankers
Tanker for oil
<None> Carriage of oil in bulk For carriage of oil
Tanker for oil products
Design requirements: Carriage of oil products in For carriage of all oil
Pt.5 Ch.5 bulk products except crude oil
Bulk carrier or tanker for oil
Design requirements: Carriage of dry bulk cargo
Pt.5 Ch.1 Sec.3 <None> alternating with carriage of Combination carrier
7 Chemical tankers
Table 6 Ship type notations for chemical tankers
Tanker for c
Yes Chemical carriers according
Carriage of specific type of
to the IBC or BHC code.
Design requirements: liquid chemical. c denotes
<None> Cargoes not requiring full
Pt.5 Ch.6 the type of cargo for which
compliance with Pt.5 Ch.6
the ship is Classed.
FiS survey requirements: Sec.1 to Sec.14.
Tanker for chemicals
Yes Chemical carriers with
cargos listed in the IBC
<None> Carriage of chemicals code Ch.17 and Ch.18 with
Pt.5 Ch.6 additions given in IMO
FiS survey requirements: MEPC.2/Circ. XX List 1.
8 Liquefied gas tankers
Table 7 Ship type notation for liquefied gas tankers
Tanker for liquefied gas
<None> Carriage of liquefied gas
9 Compressed gas tankers
Table 8 Ship type notation for compressed gas tankers
Tanker for compressed
Carriage of compressed
Design requirements: <None>
10 Offshore service vessels
Table 9 Ship type notations for offshore service vessels
Offshore service vessel For vessels providing
Mandatory: <None> services for offshore
Design requirements: For services in harsh
FiS survey requirements: Towing of floating objects
Anchor handling and handling of anchoring
Sec.3, Pt.7 Ch.1 Sec.4, and
Pt.7 Ch.1 Sec.6 [34] Towing floating objects in
open waters
Supply Platform Supply services
Towing of floating objects,
Compliance withAnchor
handling of anchoring
AHTS handling, Towing and
equipment, and platform
supply services
Maintenance and service of
Windfarm maintenance
offshore wind farms
Standby vessel Rescue operations and
Mandatory: standby services
Pt.5 Ch.9 Rescue operations and
FiS survey requirements: S standby services in harsh
Pt.7 Ch.1 Sec.2, Pt.7 Ch.1 weather conditions
11 Vessels for special operations
Table 10 Ship type notations for vessels for special operations
Crane vessel
Pt.5 Ch.10 Sec.2 <None> Crane operations
Pt.7 Ch.1 Sec.6
Cable laying vessel
<None> Cable laying
Pt.5 Ch.10 Sec.3
Pipe laying vessel
<None> Pipe laying
Semisubmersible heavy
transport vessel
Designed to load and
Yes unload deck cargo by
Carriage of heavy unitized
Design requirements: <None> temporarily submerging its
Pt.5 Ch.10 Sec.5 cargo deck through ballast
Diving support vessel <None> Diving support operations
Diving support operations
No SAT with no operating
Design requirements: restrictions
Pt.5 Ch.10 Sec.6 Diving support operations
FiS survey requirements: with operating restrictions to
Pt.7 Ch.1 Sec.2, Pt.7 Ch.1 maximum depth of 60 m and
Sec.3, and Pt.7 Ch.1 Sec.4 operating time 8 hr
Seismic vessel Requirements to hull
<None> Seismographic research
Mandatory: arrangement and strength
Pt.5 Ch.10 Sec.7 Requirements to systems
A Seismographic research
FiS survey requirements: and equipment
Well stimulation vessel
<None> Well stimulation
Fire fighter <None> Fire fighting
Fire fighting with active
No protection, giving it the
Design requirements: I capability to withstand
higher heat radiation loads
from external fires
Pt.7 Ch.1 Sec.2, Pt.7 Ch.1 Fire fighting with active and
passive protection, giving it
the capability to withstand
the higher heat radiation
I+
loads also when the active
protection fails. In addition,
the vessel incorporates a
longer throw length
Continuous fire fighting of
large fires and cooling of
II structures. Can be assigned
in combination with Fire
fighter (I)
structures with larger water
pumping capacity and more
comprehensive fire fighting
equipment than for II. Can
be assigned in combination
with Fire fighter (I)
Vessels not specifically built
for fire fighting purpose
but for which have special
Capability Fire fighting capability
fire fighting capabilities in
addition to their regular
<None> Ice breaking
Pt.5 Ch.10 Sec.10
Tug Towing of other vessels by
Mandatory: towlines
No Fs indicates maximum
Design requirements: transverse steering pull
in ton, exerted by the
escort tug on the stern
FiS survey requirements: of the assisted vessel, t
Steering and manoeuvring
Pt.7 Ch.1 Sec.2, Pt.7 Ch.1 is the time required for
Escort(Fs, t, v) operations of other vessels
Sec.3, and Pt.7 Ch.1 Sec.4 the change of the tug's
by towlines
position from one side to
the corresponding opposite
side, and v is the speed
at which this pull may be
attained
Dredger <None> Dredging
Pt.5 Ch.10 Sec.12 Suction Suction dredging
<None> Pushing
12 Non-self-propelled vessels
Table 11 Ship type notations for non-self-propelled vessels
Barge <None> Vessels with cargo hold
Vessels for dredging
Yes operations with self-
Design requirements: unloading through the No means of self-
bottom propulsion for transit
Vessels made of concrete
Pt.7 Ch.1 Sec.2, and Pt.7 Ch.1 Concrete
and with cargo hold
Sec.4
Design requirements: No means of self-
<None> Vessels without cargo hold
Pt.5 Ch.11 Sec.3 propulsion for transit
Pt.7 Ch.1 Sec.2, and Pt.7 Ch.1
13 Fishing vessels
Table 12 Ship type notations for fishing vessels
Fishing vessel <None> Fishing
Arranged for carriage of fish
No S in bulk, with shifting boards
Design requirements: in cargo holds
Pt.5 Ch.12 Fishing vessel complying
FiS survey requirements: with the requirements of
Pt.7 Ch.1 Sec.2, Pt.7 Ch.1 the Norwegian Maritime
Sec.3, and Pt.7 Ch.1 Sec.4 Directorate (NMD)
Stern trawler <None> Fishing Stern trawling
14 Naval vessels
Table 13 Ship type notations for naval and naval support vessels
Naval flagged vessels and
<None> Naval operations administered by a national
Pt.5 Ch.13 Sec.3 naval administration
Naval landing craft
Yes For vessels intended to Naval flagged vessels and
Design requirements: carry troops, vehicles and administered by a national
<None> naval administration
HSLC/NC Pt.5 Ch.13 Sec.3 equipment combined with
beach landing operations. Lpp<40 m
SECTION 4 ADDITIONAL CLASS NOTATIONS
1.1.1 Vessels that comply with the requirements provided in Pt.6 may be assigned corresponding additional
class notation as indicated in Table 1 to Table 11 of this section.
1.1.2 Certain additional class notations are mandatory for certain types of installation, features, or
equipment installed; (e.g. Bow loading, Battery(Power), Inert) where the Society has found that these
constitute possible hazards to personnel and/or the vessel. Mandatory additional class notations are indicated
in the tables referred below.
Additional class notations made mandatory for different ship types are also referred in Pt.5.
2 Structural strength and integrity
Table 1 Additional class notations related to structural strength and integrity
Grab Mandatory for ships with
Mandatory: class notation HC(M), and
Yes Strengthened inner bottom Mandatory for ships with
for grab loading and freeboard length LLL > 150
Design requirements: 1-X
unloading with grab mass X m and carrying solid bulk
Pt.6 Ch.1 Sec.1 cargoes having a density
20 t 3
FiS survey requirements: 1.0 t/m , unless Grab
(2-X) or Grab (3-X) is
Strengthened inner bottom,
and lower part of transverse
2-X bulkhead for grab loading
and unloading with grab
mass X 20 t
Strengthened inner bottom, Mandatory for Ore carrier
and lower part of transverse with class notation OC(M)
bulkhead and longitudinal or OC(H)
bulkhead for grab loading Mandatory for ships with
and unloading with grab class notation HC(A),
mass X 20 t HC(B)or HC(B*)
Strengthened Weather deck hatch covers
Mandatory: HA strengthened for heavy
Design requirements: Weather deck strengthened
for heavy cargo
FiS survey requirements: Inner bottom strengthened
NA for heavy cargo
Tanks or holds strengthened
No for heavy liquid, where
Design requirements: denotes the maximum
Pt.6 Ch.1 Sec.3 density in t/m in specified
cargo tanks
HC Strengthened to carry dry
Mandatory: bulk cargoes of density
A 1.0 t/m with specified holds HC with one of qualifiers
empty at scantling draught, AB, B*C or M are
Design requirements: in addition to HC(B). mandatory for:
Pt.6 Ch.1 Sec.4 General dry cargo
Strengthened to carry dry
FiS survey requirements: bulk cargoes of density ship designed for
NA B
1.0 t/m with all holds carriage of solid bulk
loaded, in addition to cargoes, with L 150
HC(C). m, having minimum five
cargo holds
Strengthened to carry dry Multi-purpose dry
bulk cargoes of density cargo ship designed
1.0 t/m with any hold for carriage of solid bulk
empty at scantling draught cargoes, with L 150
m, having minimum five
C bulk cargoes of density< 1.0
3 Bulk carrier without
CSR notation, with L
Designed to carry dry bulk 150 m
M cargoes as described in the
loading manual
Maximum cargo density
Mandatory for ships with
Yes class notation BC(A),
Design requirements: Designed for a maximum BC(B), HC(A)HC(B) or
Pt.6 Ch.1 Sec.4 and CSR Ch.1 cargo density in t/m . HC(B*)designed for a
Sec.1 maximum cargo density <
3.0 t/m
No MP
Ships not designed for
<None> loading and unloading in
Pt.6 Ch.1 Sec.4 and CSR Ch.1 multiple ports
OC Strengthened for loading Mandatory for ships with
Mandatory: and unloading in multiple class notation Ore carrier
ports, in addition to OC(H) with L 150 m, unless
notation OC(H) is assigned
Designed to carry ore Mandatory for ships with
cargoes in seagoing class notation Ore carrier
FiS requirements: H
homogeneous loading with L 150 m, unless
NA conditions OC(M) is assigned
Holds n may be empty Holds may be empty at
Mandatory: maximum draught (for
Yes OC(M) maximum draught
class notation BC(A),
among the seagoing loading
Design requirements: HC(A), HC(M), if alternate
<None> conditions in the loading
Pt.6 Ch.1 Sec.4 and Pt.6 Ch.1 loading conditions are
manual) where n is the
Sec.5, and CSR Ch.1 Sec.1 included in the loading
identification number for
manual, or OC(M)
FiS survey requirements: each hold that may be
NA empty
No Extended scope of fatigue
Design requirements: <None> strength assessment for hull
Pt.6 Ch.1 Sec.6 structural details
CSA Fatigue strength control in
Mandatory: accordance with CSA(FLS1)
1 and ultimate strength
check based on direct load
Design requirements: calculations
Fatigue strength control in
FiS requirements: accordance with CSA(FLS2)
NA 2 and ultimate strength
Fatigue strength control
FLS1 based on direct load
Additional fatigue strength
control based on direct
FLS2 load calculations with
increased scope compared to
CSA(FLS1)
RSD Mandatory for vessels with
Mandatory: class notation Container
ship having one of the
following characteristics:
novel design
Structure strength is verified complex structural
FiS requirements: <None> by means of global finite arrangement
NA element assessments L330m
B47m
v25kn
hatch coaming built of
VL D47 or VL E47 steel
grades.
COAT-PSPC The X denotes:
Mandatory: B requirements for
Additional requirements dedicated seawater ballast
for corrosion prevention of tanks of all types of vessels
Design requirements: tanks and spaces/areas for
C requirements for cargo
Pt.6 Ch.1 Sec.9 newbuildings. The notation
oil tanks of crude oil
FiS survey requirements: provides compliance with
X tankers
SOLAS Ch.II-1 Pt.A-1,
Pt.7 Ch.1 Sec.6, D requirements for double
Reg. 3-2 and IMO Res.
MSC.215(82), SOLAS side-skin spaces of bulk
Ch.II-1, Reg. 3-11 and IMO carriers
Res. MSC.288(87). V requirements for void
spaces of bulk carriers and
Mandatory: The qualifier X shall be an
No integral number between
Hull side structures specially
1 and 6 and denotes the
Design requirements: X evaluated for collision
amount of strengthening of
Pt.6 Ch.1 Sec.10 impacts
the side structures against
FiS survey requirements: collisions
WIV
Fatigue and ultimate hull
No girder strength verified
Design requirements: <None> under explicit consideration Container ship
Pt.6 Ch.1 Sec.11 of wave induced vibrations
(Whipping and Springing)
Guidance note:
L is the rule length as defined in Pt.3 Ch.1 Sec.4
---e-n-d---of---g-u-i-d-a-n-c-e---n-o-t-e---
Table 2 Additional class notations related to vessels in accordance with IACS common structural
rules only
Mandatory: Mandatory for:
Yes Bulk carrier with L 90
m and cross section in
Design requirements: Vessel designed and built accordance with CSR Pt.1
IACS Common Structural Rules <None> according to IACS common Ch.1 Sec.1 [1.2.1]
Pt.1 Ch.1 Sec.1 structural rules.
Tanker for oil, Tanker
FiS survey requirements: for oil products,
Pt.7 Ch.1 Sec.2, Pt.7 Ch.1 with L 150 m
BC Strengthened to carry dry Mandatory for ships
Mandatory: bulk cargoes of density with class notation Bulk
A 1.0 t/m with specified holds carrier with L 150 m,
empty at scantling draught, unless BC(B) or BC(C) is
Design requirements: in addition to BC(B). assigned.
IACS Common Structural Rules
Pt.1 Ch.1 Sec.1 Strengthened to carry dry
with class notation Bulk
FiS survey requirements: bulk cargoes of density
B 3 carrier with L 150 m,
1.0 t/m with all holds
NA unless BC(A) or BC(C) is
loaded, in addition to BC(C).
assigned.
Strengthened to carry dry with class notation Bulk
C bulk cargoes of density< 1.0 carrier with L 150 m,
t/m unless BC(A) or BC(B) is
Strengthened for grab Mandatory for ships with
X loading and discharging with class notation BC(A) or
IACS Common Structural Rules grab mass X 20 t BC(B)
3 Propulsion, power generation and auxiliary systems
Table 3 Additional class notations related to propulsion, power generation and auxiliary systems
Battery Mandatory for vessels
Mandatory: where the battery power is
Battery installations for used as the main source of
Power propulsion and other power, or when the battery
Design requirements: services is used as a redundant
Pt.6 Ch.2 source of power for class
Pt.7 Ch.1 Sec.2, Pt.7 Ch.1 Mandatory for vessels
Sec.3, and Pt.7 Ch.1 Sec.4 where the battery
installation is used as an
Battery installations used
additional source of power
Safety as an additional source of
and has an aggregate
capacity exceeding 50kWh
(excluding lead acid and
NiCd batteries)
<None> Unattended machinery space
Sec.3 and Pt.7 Ch.1 Sec.4
Design requirements: Centralised
Pt.6 Ch.2 Operated machinery
FC Mandatory where the
Mandatory: fuel cell power is used for
Power Fuel cell installations
essential, important or
Pt.6 Ch.2 Fuel cell installations where Mandatory where the fuel
FiS survey requirements: the fuel cell power is not used is a gas or a liquid
used for essential, important fuel with flash point below
or emergency users. 60C
Fuel Fuel treatment and
Mandatory: conditioning system, where
is maximum viscosity in
cSt at 50C, is maximum
Design requirements: 3
density in kg/m of the
, , T
Pt.6 Ch.2 fuel oil at 15C, and T
is minimum outside air
temperature in C for
Pt.7 Ch.1 Sec.2, Pt.7 Ch.1 which the installations are
Sec.3, and Pt.7 Ch.1 Sec.4 approved
Gas fuelled
Design requirements: Gas fuelled engine
<None> Mandatory when installed
Pt.5 Ch.2 installations
Gas ready The qualifier D is
Mandatory: mandatory for assigning
the class notation Gas
ready, and indicates that
Design requirements: Ship is designed for future
the design for the ship
D conversion to liquefied
Pt.6 Ch.2 Sec.8 with LNG as fuel is in
natural gas (LNG) fuel
compliance with the Gas
fuelled notation applicable
NA for the newbuilding, ref.
Ch.1 Sec.2 [1.3].
Installed structural
reinforcements to support
the fuel containment system
S (LNG fuel tank(s)), and
materials to support the
relevant temperatures are
Installed Fuel containment
system (LNG fuel tank(s)).
Installed pipe routing,
structural arrangements for
bunkering station, and gas
valve unit space.
The qualifier MEC is
mandatory for assigning
Main engine(s) installed can
MEC the class notation Gas
be converted to dual fuel.
ready. MEI can be used as
an alternative.
be operated on gas fuel.
The auxiliary engine
Auxiliary engine(s) installed
capacity after conversion
AEC can be converted to dual
shall be sufficient for the
ship power balance.
Auxiliary engines installed
can be operated on gas fuel.
Boilers installed are capable
of burning gas fuel.
Additional systems and
equipment are installed on
board from newbuilding
stage.
LFL fuelled
Design requirements: Low flashpoint liquid fuelled
Pt.6 Ch.2 engine installations
RP Main and alternative
Mandatory: propulsion is provided by a
common propulsion system
(one propeller, one shaft
and one rudder/steering
Pt.6 Ch.2 gear) with redundant prime
movers or two or more
Propulsion and steering are
of a redundant design with
two (or more) propellers in
parallel operation
two (or more) propellers
in parallel operation and
separated by watertight
A-60 bulkheads
% of the propulsion power
and where relevant,
associated steering system, Mandatory for RP(1),
can be restored and RP(2), and RP(3)
maintained after single
Propulsion power and
steering capacity is
+ maintained without
disruption upon any single
4 Navigation and manoeuvring
Table 4 Additional class notations related to navigation and manoeuvring
DYNPOS Includes single DP control
Dynamic positioning system
Mandatory: AUTS system and manual levers
with no redundancy.
control back-up
Design requirements: Dynamic positioning system
Includes single DP control
Pt.6 Ch.3 Sec.2Pt.6 Ch.3 Sec.1 system, single joystick
AUT Provides higher availability
FiS survey requirements: control system and manual
and robustness compared to
levers control back-up.
Pt.7 Ch.1 Sec.6 DPS(1)
Dynamic positioning system Includes redundant DP
with redundancy in technical control system, single
AUTR design. Provides higher joystick control system and
availability and robustness manual levers control back-
compared to DPS(2) up.
Includes redundant DP
Dynamic positioning system control system, single
with redundancy and joystick control system and
separation in technical manual levers control back-
AUTRO
design. Provides higher up. In addition a single
availability and robustness DP control system in a
compared to DPS(3) separated back-up control
space.
control system and single
independent alternative DP
Dynamic positioning system control system and manual
with enhanced reliability. levers control back-up.
Position and heading keeping Provides flexibility and
ability meets intentions increased availability of
comparable to or exceeding power and thrust by use of
DPS(2) connected power systems,
standby start and change-
over of generator sets and
thrusters.
Includes, in addition to the
with enhanced reliability.
properties of qualifier E,
Position and heading keeping
fire resistant separation
ability meets intentions
ER between redundancy
comparable to or DPS(2)
groups, which in addition
and DPS(3) (depending on
is watertight below main
which failure mode being
evaluated).
Annual survey to be carried In combination with
A out in accordance with scope qualifiers AUTR, AUTRO,
for renewal survey. E, ER
DPS Dynamic positioning
Mandatory: system with no redundancy
corresponding to IMO Includes single DP control
guideline IMO MSC/Circ.645 system, single joystick
Guidelines for vessels control system and manual
Pt.6 Ch.3 Sec.2 with dynamic positioning levers control back-up.
systems DP equipment
class 1.
with redundancy in technical
design corresponding to IMO
control system, single
guideline IMO MSC/Circ.645
2 joystick control system and
Guidelines for vessels
manual levers control back-
with dynamic positioning
with redundancy and
separation in technical
joystick control system and
3 guideline IMO MSC/Circ.645
up. In addition a single
DP control system in a
separated back-up control
Annual survey to be carried
In combination with
A out in accordance with scope
qualifiers 2, 3,
for renewal survey.
NAUT NAV Basic requirements.
Mandatory: Requirements within Enhanced requirements
No OC bridge design, bridge for vessels operating world
Design requirements: instrumentation and wide.
workstation arrangements.
Pt.6 Ch.3 Vessels with NAUT-notation Enhanced requirements for
FiS survey requirements: AW will comply with the vessels operating in coastal
principles and aims of and narrow waters.
SOLAS V/15 and IMO MSC/
Vessels operating as
Circ.982.
OSV service vessels for offshore
Enhanced multi functional
workstation arrangement for Vessels with class notation
network based navigational NAUT
5 Cargo operations
Table 5 Additional class notations related to cargo operations
Bow loading
Mandatory for Tanker for
Design requirements: <None> Bow loading arrangement
oil when installed
Pt.7 Ch.1 Sec.2,
No For vessels with class
Centralised cargo control for notation Tanker for oil, or
liquid cargoes Tanker for oil products,
Pt.6 Ch.4 Sec.2 or Tanker for chemicals
Design requirements: <None> Easy loading of cargo holds Ore carrier
Design requirements: <None> Effective tank cleaning
MCDK
Design requirements: <None> Movable car decks
LCS Mandatory if a loading
Mandatory: computer calculating
<None> Loading computer system
stability and/or hull
strength is installed
Loading computer system
to assist the master as a
FiS survey requirements: DC Optional
decision aid under damage
Pt.7 Ch.1 Sec.6 conditions
REGAS
<None> Regasification plant
RCP Refrigerated container
Mandatory: stowage positions, where
X represents total number
of certified refrigerated
Design requirements: stowage positions, and
Pt.6 Ch.4 Sec.9 Y is the percentage of
refrigerated containers
carrying fruit/chilled
Pt.7 Ch.1 Sec.6 cargoes. Y shall be at least
Cargo refrigeration plant,
No where XC is lowest
Design requirements: XC/YC sea chamber temperature and Y
Pt.6 Ch.4 Sec.10 C sea maximum seawater
RSCS
Design requirements: Route specific container
Pt.6 Ch.4 Sec.11 stowage
Design requirements: Submerged turret loading
Pt.6 Ch.4 Sec.1 system
VCS Systems for control of
Mandatory: vapour emission from cargo
tanks and in compliance with
IMO MSC/Circ. 585
Systems for control of
Pt.6 Ch.4 Sec.12 For vessels with class
vapour emission from cargo
FiS survey requirements: notation Tanker for oil, or
2 tanks and in compliance
Tanker for oil products,
Pt.7 Ch.1 Sec.6, with IMO MSC/Circ. 585 and
or Tanker for chemicals
USCG CFR 46 Part 39
Systems for onboard vapour
processing with a minimum
recovery rate of 78% of non-
methane VOC
For vessels with class
Additional requirements to
B notation VCS(1), or
vapour balancing.
VSC(2)
6 Equipment and design features
Table 6 Additional class notations related to equipment and design features
Equipped for carriage of For vessels other than
containers Container ship
Hatchcoverless
For hatchcoverless container
<None> ships equipped with the Container ship
Pt.6 Ch.5 Sec.2 appropriate facilities
Onboard crane certified by
Design requirements: <None> On board crane
F Additional fire protection in
Mandatory: accommodation area
No Additional fire protection in
Design requirements: cargo area
Additional fire protection in
FiS survey requirements: M
machinery space
HELDK <None> Helicopter deck
No vessel safety
Pt.6 Ch.5 Sec.5 H
helicopter safety
Pt.7 Ch.1 Sec.6, F
helicopter facility
Helicopter facility has been
evaluated for additional
CAA-N requirements specified by
the Norwegian Civil Aviation
No Compliance with
Design requirements: <None> requirements to damage Offshore service vessel
Pt.6 Ch.5 Sec.6 stability
No Ships carrying special
personnel who are neither
crew members nor
Pt.6 Ch.5 Sec.7 passengers
Inert
Mandatory if installed on
<None> Inert gas system Tanker for oil DWT< 20
Pt.6 Ch.5 Sec.8 000 ton
LFL Designed for carriage of
Mandatory: 1 liquid with flashpoint lower
than 60C
No All ships except Tanker
Design requirements: for oil and Tanker for
Designed for carriage of chemicals
2 liquid with flashpoint lower
FiS survey requirements: than 43C
DG Arranged for carriage of solid
Mandatory: dangerous goods in bulk and
packaged form in compliance
with SOLAS Reg.II-2/19
Arranged for carriage of solid
Pt.6 Ch.5 Sec.10
dangerous goods in bulk
FiS survey requirements: B
in compliance with SOLAS
Pt.7 Ch.1 Sec.6, Reg.II-2/19
Arranged for carriage
of dangerous goods in
Arranged for carriage of
No solid dangerous goods in
Design requirements: <None> bulk in compliance with the
Pt.6 Ch.5 Sec.10 technical provisions of the
IMSBC Code
OILREC
Recovered oil reception and All ships except Tanker for
transportation oil
Design requirements: <None> Single point mooring
ESV Enhanced verification of
Mandatory: dynamic positioning
No Enhanced verification of
Design requirements: thruster assisted mooring or
automatic thruster assisted
mooring systems
Pt.7 Ch.1 Sec.6, Enhanced verification of
power management system
Enhanced verification of
SPT steering, propulsion and
thruster system
ICS integrated control and
drilling control system
blow out prevention system
Hardware-In-the-
Loop (HIL) Testing where
HIL-IS
HIL test package is provided
by independent HIL supplier
HIL test program package
and HIL test package report
are provided by independent
HIL-DS
HIL supplier and HIL test
simulator package is
provided by the organization
delivering the HIL target
Gas bunker Equipped with dedicated
Mandatory: gas fuel transfer equipment
<None> for supply of bunker to gas
fuelled ships on a regular
Design requirements: basis.
Equipped for handling of
FiS survey requirements: excess vapour return from Applicable for vessels with
NA VR-x the receiving ship with class notation Tanker for
vapour recovery capacity of liquefied gas
x kW.
Equipped with enhanced
positioning control system.
transfer control system.
7 Cold climate
Table 7 Additional class notations related to cold climate
Ice High powered vessels for Vessels constructed
Mandatory: 1A*F regular traffic in heavy Baltic according to Finnish-
ice. Swedish ice rules.
Design requirements: Constructed according to
Vessels intended for
Finnish- Swedish ice rules
Pt.6 Ch.6 1A* navigation in ice-infested
(1A Super). Ice thickness
FiS survey requirements: waters
Vessels intended for Constructed according to
1A navigation in ice-infested Finnish- Swedish ice rules
waters (1A). Ice thickness 0.8 m.
1B navigation in ice-infested Finnish- Swedish ice rules
waters (1B). Ice thickness 0.6 m
1C navigation in ice-infested Finnish- Swedish ice rules
waters (1C). Ice thickness 0.4 m
C navigation in light ice
E navigation in light localised
drift ice
PC Vessels intended for
Year-round operation in all
Mandatory: 1 navigation in ice-infested
Polar waters
polar waters.
Design requirements: Vessels intended for Year-round operation in
2 navigation in ice-infested moderate multi-year ice
polar waters conditions
NA Year-round operation in
second-year ice which
3 navigation in ice-infested
may include multi-year ice
Year-round operation
in thick first-year ice
which may include old ice
Year-round operation in
medium first-year ice
Summer/autumn operation
in medium first-year ice
in thin first-year ice
Winterized Occasional operation in cold
Mandatory: climate for short periods
No Regular operation in cold
Design requirements: Cold climate or for an extended
FiS survey requirements: Operation in extreme cold
Polar climate of the polar regions
td Design temperature
Additional requirements of a
higher level of winterization
Mandatory: Design ambient air
No temperature suitable for
regular service during winter
Design requirements: t
to polar waters, where t
Pt.6 Ch.6 denotes the lowest design
FiS survey requirements: ambient temperature in C
8 Environmental protection and pollution control
Table 8 Additional class notations related to environmental protection and pollution control
BWM m denotes method of
Mandatory: exchange as follows:
No E[m] Ballast water exchange. s - sequential method
Design requirements: f - flow-through method
Pt.6 Ch.7 Sec.1 d - dilution method
T Ballast water treatment
Clean Arrangements for controlling
Mandatory: <None> and limiting operational
emissions and discharges
Design requirements: Additional design
requirements for protection
Pt.6 Ch.7 Sec.2 Design
against accidents and for
FiS survey requirements: limiting their consequences
Compliance with the NOx
emission requirements of
Tier III according to MARPOL
Annex VI, Regulation 13.
ECA designed to operate all
Mandatory: SOx-A machinery on marine
distillate fuel. Fuel and Lubrication Oil
System and Arrangements
Design requirements: Designed to operate for meeting Regulations in
Pt.6 Ch.7 Sec.3 machinery components Emission Control Areas.
SOx-P
FiS survey requirements: used while in port on marine
distillate fuel.
Inventory of Hazardous
Design requirements: <None> Electric shore connections
Silent Vessels using acoustical
Mandatory: equipment
No Vessels conducting seismic
Design requirements: surveys
Vessels complying with
Pt.6 Ch.7 Sec.6 F specified maximum Fishing vessel
FiS survey requirements: underwater noise emission
R Research vessel
Vessels demonstrating a
E controlled environmental
noise emission
9 Living and working conditions
Table 9 Additional class notations related to living and working conditions
COMF Vessels designed for
Mandatory: enhanced comfort by
C-crn improved indoor climate.
crn denotes comfort rating
Design requirements: number
Vessels designed for
FiS survey requirements: enhanced comfort by
NA V-crn reducing noise and vibration.
VIBR
Limitations to vibration
SAFELASH
Increased safety level
No Container ships and
for crew members and
vessels assigned the
Design requirements: <None> stevedores engaged in the
Pt.6 Ch.8 Sec.3 handling and securing of
containers.
10 Survey arrangements
Table 10 Additional class notations related to survey arrangement
No Built for in-water survey
Design requirements: <None> of the vessel bottom and
Pt.6 Ch.9 Sec.1 related items
ESP Mandatory for vessels with
Mandatory: class notations:
Yes Bulk carrier
Design requirements: Tanker for oil
Pt.6 Ch.9 Sec.2 Bulk carrier or tanker for
Vessels subject to an and
Pt.7 Ch.1 Sec.2, Pt.7 Ch.1 <None>
enhanced survey programme
Sec.3, and Pt.7 Ch.1 Sec.4Pt.7 Tanker for chemicals
Ch.1 Sec.5 Tanker for c
having integral tanks
intended for carriage of
liquid chemicals in bulk in
accordance with the IBC
<None> Hull life cycle programme
HMON Sensor monitoring
Mandatory: acceleration along one axis
No Statistical back-up and
Design requirements: Bn trigged time series to be
sent annually to the Society
FiS survey requirements: Online link to loading
computer which is
Pt.7 Ch.1 Sec.6, Cn
continuously up-dating the
loading condition
Online data link between
hull monitoring system on
board to office ashore. The
link shall make it possible
to operate the system
from an onshore computer,
perform maintenance and
transfer data
Sensor monitoring the
En propulsion shaft(s) output/
Hull monitoring at various
Sensor monitoring global
Gn locations to reduce the need
hull strain
for internal survey through
increased focus on hull Sensor monitoring the
Hn stress warnings. n denotes liquid motion pressures in
number of sensors tanks (sloshing)
Sensor monitoring local hull
Device for monitoring of
Mn hull rigid body motions (six
degrees of freedom)
Navigation sensors
(position fixing system
On (e.g. GPS), speed log, gyro
compass, rudder angle,
etc.)
Sensor monitoring the sea
pressure acting on the hull
Device for monitoring the
sea-state
Wind sensor for wind speed
and wind heading
Tail shaft monitoring enables
operators to continuously
No observe and assess the
Design requirements: <None> condition of the shaft(s)
Pt.6 Ch.9 Sec.5 which may extend interval
between tail shaft surveys/
shaft withdrawal
BMON
Boiler monitoring reduces
No the need for internal survey
Design requirements: <None> at every alternate survey
Pt.6 Ch.9 Sec.6 through increased focus on
11 Naval
Table 11 Additional class notations related to naval vessels
All naval flagged vessels
Mandatory: and administered
No Basic requirements to by a national naval
bridge design, bridge administration, except:
Design requirements: Navy
instrumentation, and
Pt.6 Ch.10 Sec.1 workstation arrangement vessel of less than 24
meters LOA
Naval support Naval operations and Naval
Mandatory: support operations
Yes Naval requirements for
Design requirements: Hull arrangements, loads and hull
FiS survey requirements: Naval requirements for
Sec.3, and Pt.7 Ch.1 Sec.4 Naval requirements for
System piping, machinery, electrical,
control and monitoring
Naval requirements for fire
Fire administered by a national
naval administration
Naval requirements for safe
Naval requirements for
RADHAZ
radiation hazards
Naval requirements
EMC for electromagnetic
SAM for storage rooms for
11.1 General
11.1.1 The class notation Naval support may be combined with ship type notations in Pt.5.
11.1.2 The qualifiers to Naval support are optional
11.1.3 Any combination of qualifiers for Naval support are allowed. For example Naval support(Hull,
STAB, Fire)
SECTION 5 SERVICE AREA
1 Service area notation
1.1.1 The service area notation R followed by a number or a letter will be assigned to vessels with modified
requirements to arrangement, equipment or scantlings, in relation to vessels built for unrestricted trade.
The service area restrictions, given in nautical miles and representing the maximum distance from nearest
port or safe anchorage, are given in Table 1 of this section. For the various service area notations the
restrictions are related to the zones, areas and seasonal periods as defined in the International Convention
on Load Lines, 1966, Annex II.
The service area notation RE is limited to enclosed waters such as fjords, ports, rivers and lakes.
The service area restrictions as related to the assigned service area notation will be included in the Appendix
to the Class Certificate.
Table 1 Service area restrictions
Service area notations Seasonal zones (nautical miles)
Winter Summer Tropical
R0 250 No restrictions No restrictions
R1 100 200 300
R2 50 100 200
R3 20 50 100
R4 5 10 20
RE Enclosed waters
1.1.2 Modified requirements related to the various service area notations are given in the relevant sections
of the rules. The modifications will affect:
design hull girder loads
design pressures on shell, weather decks, superstructures and deckhouses
anchoring and mooring equipment
1.1.3 The flag administration, the domestic requirements of which are being applied under the provision of
Ch.1 Sec.2 [1.3.5] (local trade), shall be indicated in parentheses after the service area notation, by using
lower-case country codes in accordance with ISO 3166, (e.g. R2 (nor), should the flag administration be
Norway or R2 (usa) should the flag administration be U.S.A. etc.).
1.1.4 Other service restrictions or operational limits included in the design assumptions for a vessel will be
stated in the Appendix to the Class Certificate, and/or on special signboards.
Driven by our purpose of safeguarding life, property and the environment, DNV GL enables
organizations to advance the safety and sustainability of their business. We provide classification and
technical assurance along with software and independent expert advisory services to the maritime,
oil and gas, and energy industries. We also provide certification services to customers across a wide
range of industries. Operating in more than 100 countries, our 16 000 professionals are dedicated to
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