The electronic pdf versions of the documents found through http://www.dnv.com/ are the officially binding versions. Copyright Det Norske Veritas.
![[Table of Contents]](/dwicons/b_toc.gif)
|
DNV-OSS-101 Rules for Classification of Offshore Drilling and Support Units
|
Ch.2
SECTION 6
Additional Class Notations: Design and Construction Requirements
for Special Equipment and SystemsCh.2 Sec.6
A. Introduction
Ch.2 Sec.6
A 100 General
Ch.2 Sec.6 A
101 This section identifies design and construction requirements
for assignment of additional class notations relating to system,
equipment and special facility installations.
Ch.2 Sec.6 A
102 Units fitted with systems and/or special features
complying with relevant requirements of this section may be assigned
class notations as described in Ch.1 Sec.3 Tables B3 and B5.Ch.2 Sec.6
A 200 Technical reference documents
Ch.2 Sec.6 A
201 Technical requirements are given by reference to selected:
| — | DNV offshore standards |
| — | DNV recommended practices |
| — | other DNV rules and standards |
| — | internationally recognised codes and standards. |
Ch.2 Sec.6 A
202 The technical reference documents which shall be applied are
given in the following subsections and summarised in Table V1.Ch.2 Sec.6
A 300 General assumptions
Ch.2 Sec.6 A
301 DNV may accept alternative solutions found to represent an
overall safety level equivalent to that stated in the requirements
of this document or referred standards.
Ch.2 Sec.6 A
302 The requirements stated in this section for additional class
notations shall be regarded as supplementary to those given for
assignment of main class and relevant service notations.Ch.2 Sec.6
B. Position Mooring System
Ch.2 Sec.6
B 100 General
Ch.2 Sec.6 B
101 POSMOOR notation
may be assigned to units fitted with single or spread point mooring
systems in accordance with the requirements of this section.
Ch.2 Sec.6 B
102 The notation is complemented with the symbols -V, -TA or -ATA as described in
Table B1.Ch.2 Sec.6 B
| Table B1 POSMOOR class
notations |
| Notation | Description |
| POSMOOR | Passive position mooring system |
| POSMOOR-V | Mooring system designed for positioning in
vicinity of other structures |
| POSMOOR-TA | Thruster assisted mooring system dependent
on manual remote thrust control system |
| POSMOOR-ATA | Thruster assisted mooring system dependent
on automatic remote thrust control system |
Ch.2 Sec.6 B
103 The notations aim to cover the reliability of the mooring
system and equipment, for the purpose of ensuring safe position
mooring, and covers the following aspects:| — | environmental conditions and
loads |
| — | mooring system analysis |
| — | thruster assisted mooring |
| — | mooring equipment |
| — | tests. |
Ch.2 Sec.6
B 200 Technical requirements
Ch.2 Sec.6 B
201 The technical requirements of DNV-OS-E301 shall be complied
with for assignment of the POSMOOR notations. Ch.2 Sec.6
B 300 Certification of materials and
components
Ch.2 Sec.6 B
301 Certification of equipment shall be in accordance with DNV-OS-E301,
Ch.3.Ch.2 Sec.6
C. Dynamic Positioning Systems
Ch.2 Sec.6
C 100 General
Ch.2 Sec.6 C
101 The following notations may be assigned to units with dynamic
positioning systems: DYNPOS-AUTS, DYNPOS-AUT, DYNPOS-AUTR or DYNPOS-AUTRO according
to extent of requirements applied.Ch.2 Sec.6 C
| Table C1 DYNPOS class
notations |
| Notation | Description |
| DYNPOS-AUTS | Dynamic positioning system without redundancy |
| DYNPOS-AUT | Dynamic positioning system with an independent
joystick back-up and a position reference back-up |
| DYNPOS-AUTR | Dynamic positioning system with redundancy
in technical design and with an independent joystick back-up |
| DYNPOS-AUTRO | Dynamic positioning system with redundancy
in technical design and with an independent joystick back-up. Plus
a back-up dynamic positioning control system in an emergency dynamic positioning
control centre, designed with physical separation for components
that provide redundancy |
Ch.2 Sec.6 C
102 The various notations depend on the dynamic positioning system
layout and configuration as given in Table C1.
Ch.2 Sec.6 C
103 The dynamic positioning system includes requirements for the
following subsystems, control panels and back-up systems which are
necessary to dynamically position the unit:| — | power system |
| — | controller |
| — | measuring system |
| — | thruster system |
| — | remote thrust control |
| — | control panels. |
Ch.2 Sec.6
C 200 Technical requirements
Ch.2 Sec.6 C
201 Technical requirements for the dynamic positioning notations
shall be in accordance with the Rules for Classification of Ships
Pt.6 Ch.7.
Ch.2 Sec.6 C
202 For DPS notations
granted through class entries, see Rules for Classification of Ships
Pt.6 Ch.7.Ch.2 Sec.6
D. Drilling Plant
Ch.2 Sec.6
D 100 General
Ch.2 Sec.6 D
101 DRILL notation
covers design fabrication, installation and operational aspects
of offshore drilling facilities which have potential to affect safety
of personnel or pollution of the environment.
Ch.2 Sec.6 D
102 DRILL notation
requires certification of drilling equipment and systems, and approval
of the complete drilling plant, which includes at least the following: | — | Drilling
structures| — | Well control systems| — | Heave compensation and tensioning systems| — | Hoisting and rotating systems| — | Drilling equipment handling systems| — | Bulk storage, drilling fluid mixing and circulation,
and cementing systems| — | Well testing systems| — | Other drilling equipment (winches, gear transmissions,
man-riding equipment). | | | | | | | |
Ch.2 Sec.6
D 200 Technical requirements
Ch.2 Sec.6 D
201 The requirements for drilling facilities are stated in DNV-OS-E101.Ch.2 Sec.6
D 300 Certification of materials and
components
Ch.2 Sec.6 D
301 Procedures and requirements for classification including certification
of equipment shall be in accordance with DNV-OS-E101, Ch.3.
Ch.2 Sec.6 D
302 Manufacturers of materials, components and equipment for DRILL class shall, prior
to construction is started, provide the Society with evidence of
their capability to successfully carry out fabrication with adequate quality.Guidance note:
Evidence may incorporate successful outcome of construction
projects of similar nature. ---e-n-d---o-f---G-u-i-d-a-n-c-e---n-o-t-e---
Ch.2 Sec.6
D 400 DRILL(US)
Ch.2 Sec.6 D
401 Drilling systems and equipment for use on the Gulf of Mexico
Outer Continental Shelf shall comply with the regulations of the
Bureau of Ocean Energy Management Regulation and Enforcement (BOEMRE).
Ch.2 Sec.6 D
402 ObjectiveThe objective of DRILL(US) is to ensure that the drilling
plant is in compliance with relevant BOEMRE regulations.
Ch.2 Sec.6 D
403 Scope
The scope of DRILL(US) is identical with the scope as defined
in DNV-OSE101
Ch.2 Sec.6 D
404 Application
Units equipped with drilling plants in compliance with DNV-OS-E101
and the requirements in this sub-section will be entitled to the
class notation DRILL(US).
Ch.2 Sec.6 D
405 Technical requirements
An ROV must be maintained on each floating drilling rig on
a continuous basis.
Ref: BOEMRE 30 CFR Part III, par
250.442(c), 250.515(e) and 250.615(e)
Ch.2 Sec.6 D
406 Autoshear and Deadman systems must be provided on DP rigs
DRIL(US)Ref: BOEMRE 30 CFR Part III, par 250.442(f), 250.515(e)
and 250.615(e)
Ch.2 Sec.6 D
407 Subsea BOP stack must be equipped with remotely operated vehicle
(ROV) intervention capability. At a minimum, the ROV must be capable
of closing one set of pipe rams, closing one set of blind-shear
rams, and unlatching the lower marine riser package.
Ref: BOEMRE 30 CFR Part III, par
250.442(c), 250.515(e) and 250.615(e)T
Ch.2 Sec.6
E. Helicopter Decks
Ch.2 Sec.6
E 100 General
Ch.2 Sec.6 E
101 Units fitted with erected landing platforms for helicopters
or landing areas arranged directly on decks or top of deckhouses
may be given the class notations HELDK or HELDK-S or HELDK-SH.
Ch.2 Sec.6 E
102 The various notations are related to the extent of requirements
as given in Table E1.Ch.2 Sec.6 E
| Table E1 HELDK class
notations |
| Notation | Description |
| HELDK | Structural strength |
| HELDK-S | Strength and units safety |
| HELDK-SH | Strength, units safety and helicopter safety |
Ch.2 Sec.6
E 200 Technical requirements
Ch.2 Sec.6 E
201 Technical requirements for HELDK shall comply with DNV-OS-E401,
Ch.2, as applicable: | — | Sec.1 to Sec.4 for notation HELDK |
| — | Sec.1 to Sec.5 for notation HELDK-S |
| — | Sec.1 to Sec.6 for notation HELDK-SH. |
Ch.2 Sec.6
F. Well Testing Facilities
Ch.2 Sec.6
F 100 General
Ch.2 Sec.6 F
101 Units equipped with facilities for well testing may be assigned
class notation WELLTEST.
Ch.2 Sec.6 F
102 WELLTEST is
intended for limited testing of wells in relation to drilling activities,
and is applicable for units having service notation Drilling Unit.Ch.2 Sec.6
F 200 Technical requirements
Ch.2 Sec.6 F
201 The requirements given in DNV-OS-E101, Ch.2 Sec.5 H,
shall be complied with.Ch.2 Sec.6
F 300 Certification of materials and
components
Ch.2 Sec.6 F
301 Components subject to certification are given in DNV-OS-E101,
Ch.3.Ch.2 Sec.6
G. Temporary Oil Storage Facilities
Ch.2 Sec.6
G 100 General
Ch.2 Sec.6 G
101 Units arranged and equipped with facilities for temporary
storage of oil in relation to drilling or well testing activities
may be assigned class notation TEMPSTORE.
Ch.2 Sec.6 G
102 The following conditions apply for assignment of TEMPSTORE: - The notation applies to units
with drilling as main activity; i.e. the unit is to have service
notation Drilling Unit.
- Well testing and crude storage shall be undertaken onboard
the drilling unit; transfer and storage of well test crude from
another unit are not allowed.
- Transportation of crude oil is not allowed (defined
as carriage of oil from port to port or from field to shore with
associated discharging in port).
- Inter-field voyages between wells can be undertaken.
Ch.2 Sec.6 G
103 Crude oil tanks may be arranged in pontoons and columns of
column-stabilised units upon special consideration. Ch.2 Sec.6
G 200 Technical requirements
Ch.2 Sec.6 G
201 The requirements given for Storage
Units in the following offshore standards shall be complied
with as applicable for TEMPSTORE:| — | DNV-OS-A101 |
| — | DNV-OS-D101 |
| — | DNV-OS-D301. |
Ch.2 Sec.6
H. Crane Installations
Ch.2 Sec.6
H 100 General
Ch.2 Sec.6 H
101 CRANE notation
may be given to units with permanently installed cranes.
Ch.2 Sec.6 H
102 In addition to certification of the crane, the following is
covered:| — | supporting structure for the
crane, (strengthening of deck structure, pedestal etc.) |
| — | devices for locking crane in parked position (unit at
sea). |
Ch.2 Sec.6 H
103 For units intended for lifting as main service reference is
also made to the service notation Crane
Unit described in Sec.5. Ch.2 Sec.6
H 200 Technical requirements
Ch.2 Sec.6 H
201 The requirements given in the Rules for Classification of
Ships, Pt.6 Ch.1 Sec.3, shall be complied with for assignment of
class notation CRANE.Ch.2 Sec.6
H 300 Certification of materials and
components
Ch.2 Sec.6 H
301 Cranes shall be delivered as DNV certified in accordance with
DNV Standards for Certification No. 2.22 Lifting Appliances.Ch.2 Sec.6
I. Diving System Installations
Ch.2 Sec.6
I 100 General
Ch.2 Sec.6 I
101 Units arranged for support of diving
operations applying rope and/or umbilical connection between
the submerged bell and the unit may be given class notations DSV-SURFACE or DSV-SAT as applicable depending
on:| — | physical size of the chambers |
| — | the life support system |
| — | control stand |
| — | communication system |
| — | capacity of the emergency power supply. |
Ch.2 Sec.6 I
102 The various class notations are related to the maximum operation
depth dmax and maximum
operation time TOP as
given in Table I1.Ch.2 Sec.6 I
Table I1 DSV class
notations | Class | DSV-SURFACE | DSV-SAT | Restrictions | dmax £ 60 m
TOP £ 8 hours | None, except those imposed by
the rule requirements | | |
Ch.2 Sec.6 I
103 The class notation will cover matters of:| — | the unit's position
keeping ability during diving operations |
| — | hull structural arrangements related to the diving system,
e.g. moonpool |
| — | arrangement and installation of the diving system |
| — | electrical systems |
| — | fire protection, detection and extinction |
| — | complete diving system with respect to safety and functioning |
| — | sanitary systems (where applicable) |
| — | testing |
| — | stability and floatability. |
Ch.2 Sec.6
I 200 Technical requirements
Ch.2 Sec.6 I
201 Assignment of DSV class notations
is based on compliance with the Rules for Classification of Ships,
Pt.5 Ch.14.Ch.2 Sec.6
I 300 Certification of materials and
components
Ch.2 Sec.6 I
301 The diving equipment shall be certified according to the Rules
for Certification of Diving Systems.
Ch.2 Sec.6 I
302 Cranes and other appliances for lifting of diving equipment
and systems shall be certified according to DNV Standards for Certification
No. 2.22 Lifting Appliances.Ch.2 Sec.6
J. Additional Fire Protection
Ch.2 Sec.6
J 100 General
Ch.2 Sec.6 J
101 Units with additional fire safety measures in accommodation
spaces and machinery spaces may be assigned class notations F-A, F-M, or F-AM.
Ch.2 Sec.6 J
102 The various notations are related to areas subjected to additional
fire protection as given in Table J1.Ch.2 Sec.6 J
| Table J1 Class notations
for additional fire protection |
| Notation | Description |
| F-A | Accommodation space |
| F-M | Machinery space |
| F-AM | Accommodation and machinery space |
Ch.2 Sec.6
J 200 Technical requirements
Ch.2 Sec.6 J
201 The requirements as stated in the Rules for Classification
of Ships, Pt.6 Ch.4, shall be complied with for assignment of the
class notations.Ch.2 Sec.6
K. Fire Fighters
Ch.2 Sec.6
K 100 General
Ch.2 Sec.6 K
101 Units arranged and equipped for fighting fires on offshore
and onshore structures in accordance with the requirements of this
sub-section, may be assigned the class notation FIRE FIGHTER I, II or III. The numbers indicate
the level of capability as given by Table K1.Ch.2 Sec.6 K
| Table K1 Fire Fighter
class notations |
| Notation | Description |
| FIRE FIGHTER I | Early stage fire fighting and rescue close
to structure on fire |
| FIRE FIGHTER II | Continuous fire fighting and cooling of structures
on fire |
| FIRE FIGHTER III | As FIRE
FIGHTER II, plus larger pumping capacity and more comprehensive
equipment |
Ch.2 Sec.6
K 200 Technical requirements
Ch.2 Sec.6 K
201 The requirements given in the Rules for Classification of
Ships, Pt.5 Ch.7 Sec.5, shall be complied with for assignment of
the class notations.Ch.2 Sec.6
L. Loading computer
Ch.2 Sec.6
L 100 General
Ch.2 Sec.6 L
101 Units having installed a system integrated systems developed
to assist the master as a decision aid when the ship has been subjected
to damage and consequent flooding may be given the class notation
LCS-DC.The
letters are denoting Loading Computer System-Damage Control.Ch.2 Sec.6
L 200 Technical requirements
Ch.2 Sec.6 L
201 The requirements of the Rules for Classification of Ships
Pt.6 Ch.9 Sec.4 shall be complied with as applicable.Ch.2 Sec.6
M. Periodically Unattended Machinery
Space
Ch.2 Sec.6
M 100 General
Ch.2 Sec.6 M
101 Units where all machinery in the engine room necessary for
performance of main functions have been fitted with instrumentation
and automation systems in compliance with this sub-section, may
be assigned class notation E0 or ECO.
Ch.2 Sec.6 M
102 E0 is assigned
when machinery alarms are relayed to the bridge and engineers' accommodation,
and a central control system is fitted.
Ch.2 Sec.6 M
103 ECO is
assigned when machinery alarms are initiated in an attended centralised
control station, and a remote control system from at least this
station is fitted.Ch.2 Sec.6
M 200 Technical requirements
Ch.2 Sec.6 M
201 Assignment of class notations E0 and ECO is based on compliance
with the Rules for Classification of Ships, Pt.6 Ch.3, with qualifications
given in 202.
Ch.2 Sec.6 M
202 References to the Rules for Classification of Ships, Pt.4
Ch.10 (fire protection) shall be replaced with DNV-OS-D301 for unit
application.Ch.2 Sec.6
N. Well Intervention System
Ch.2 Sec.6
N 100 General
Ch.2 Sec.6 N
101 WELL-1 and WELL-2 notation covers
design and operational aspects of offshore well intervention facilities
which have potential to affect safety of personnel or pollution
of the environment.
Ch.2 Sec.6 N
102 WELL-1 notation
covers the vessel mounted systems associated with well intervention:| — | Well intervention structures |
| — | Heave compensation and tensioning systems |
| — | Hoisting systems |
| — | EDP/LRP and pipe handling systems |
| — | Fluid circulation |
| — | Other systems (e.g. winches, man riding equipment, skids,
carriers). |
Ch.2 Sec.6 N
103 WELL-2 notation
covers the vessel mounted systems and the subsea equipment used
for well intervention:| — | Well intervention structures |
| — | Well control systems (e.g. riser, EDP/LRP) |
| — | Wire line systems |
| — | Coiled tubing systems |
| — | Heave compensation and tensioning systems |
| — | Hoisting systems |
| — | EDP/LRP and pipe handling systems |
| — | Fluid circulation |
| — | Other systems (e.g. winches, man riding equipment, skids,
carriers). |
Ch.2 Sec.6 N
104 WELL-1 and WELL-2 include specific
requirements relating to:| — | design principles |
| — | well intervention systems and equipment |
| — | materials and welding |
| — | piping |
| — | electrical and control systems |
| — | instrumentation component design and installation |
| — | user interface (optional) |
| — | manufacture, workmanship, testing and maintenance. |
Ch.2 Sec.6
N 200 Technical requirements
Ch.2 Sec.6 N
201 The requirements for Well Intervention Systems are stated
in DNV-OS-E101.Ch.2 Sec.6
N 300 Certification of materials
and components
Ch.2 Sec.6 N
301 Procedures and requirements for classification including certification
of equipment and systems shall be in accordance with DNV-OS-E101,
Ch.3.Ch.2 Sec.6
O. Hull Monitoring System
Ch.2 Sec.6
O 100 General
Ch.2 Sec.6 O
101 Units equipped with instrumentation system for monitoring
hull behaviour in accordance with the requirements of this section
may be assigned class notation HMON
(...) as given in the Rules for Classification of Ships,
Pt.6 Ch.11.
Ch.2 Sec.6 O
102 The system will give warning when stress levels and the frequency
and magnitude of accelerations approach levels which require corrective
action.Ch.2 Sec.6
O 200 Technical requirements
Ch.2 Sec.6 O
201 Assignment of HMON
(...) class notations is based on compliance with the
Rules for Classification of Ships, Pt.6 Ch.11.Ch.2 Sec.6
P. Noise, Vibration and Comfort
Rating Notations
Ch.2 Sec.6
P 100 General
Ch.2 Sec.6 P
101 Units arranged and equipped with the aim to reduce the impact
of noise or vibration may be assigned for the following additional
class notations as given below.Ch.2 Sec.6
P 200 Vibration class
Ch.2 Sec.6 P
201 GeneralUnits arranged and equipped with the aim to reduce the risk
of failure in machinery, components and structures onboard units,
caused by excessive vibration may be given the additional class
notation VIBR.
Ch.2 Sec.6 P
202 Technical requirements
The requirements of the Rules for Classification of Ships
Pt.6 Ch.15 shall be complied with as applicable.
Ch.2 Sec.6
P 300 Comfort class
Ch.2 Sec.6 P
301 GeneralUnits arranged and equipped with the aim to reduce the impact
of noise and vibration related to comfort on board may be assigned
for the following additional class notations:
| — | COMF-V(55),
where crn is
a comfort rating number which quantifies the comfort rating of noise
and vibration for the unit |
| — | COMF-C(crn),
where crn is
a comfort rating number which quantifies the comfort rating of the
indoor climate for the unit, or |
| — | COMF-V(crn)C(crn). |
Ch.2 Sec.6 P
302 Technical requirementsThe requirements of the Rules for Classification of Ships
Pt.5 Ch.12 shall be complied with as applicable.
Ch.2 Sec.6
Q. Winterization, Cold Climate
and Ice Notations
Ch.2 Sec.6
Q 100 General
Ch.2 Sec.6 Q
101 Units designed or strengthened for operation within particular
geographical or environmental areas found to be in accordance with
relevant class rule requirements may be assigned a corresponding
optional class notation.Optional class notations related to cold climate service are
given in Ch.1 Sec.3 Table B4.
Ch.2 Sec.6
Q 200 Operation of column-stabilised
units in ice conditions
Ch.2 Sec.6 Q
201 GeneralUnits strengthened for occasional navigation and operation
in waters with light to heavy first year ice conditions in accordance
with this sub-section may be assigned class notations ICE-T or ICE-L as described in
Table R1.
Ch.2 Sec.6 Q
| Table R1 ICE class
notations |
| Notation | Description |
| ICE-T | Strengthened for ice condition transit |
| ICE-L | Strengthened for ice condition operation |
Ch.2 Sec.6 Q
202 Technical requirementsThe ice strengthening requirements given in the Rules for
Classification of Ships, Pt.5 Ch.1 Sec.3 shall be applied as far
as relevant and practicable. Propeller nozzles and associated shafts
and machinery situated more that 5 m below lowest transit waterline
(TWL) are not considered affected by ice loads.
Ch.2 Sec.6
R. Management of Safety and Environmental
Protection
Ch.2 Sec.6
R 100 General
Ch.2 Sec.6 R
101 Units which have implemented a management system in compliance
with the provisions of Q may receive a "Shipboard SEP Classification" certificate.
To receive the "Shipboard SEP Classification" certificate, the
Company must hold a valid "Company SEP Classification" certificate
and the unit must have been successfully audited by DNV. Units classified
in accordance with the provisions of Q will be given the class notation SBM.
Ch.2 Sec.6 R
102 SEP classification includes:| — | assessment of the management
system |
| — | initial audit of the SEP management system ashore and
onboard |
| — | periodical audits ashore and onboard for retention of
the SEP certificates |
| — | renewal audits ashore and onboard every fifth year. |
Ch.2 Sec.6
R 200 Technical requirements
Ch.2 Sec.6 R
201 Assignment of SBM class
notation is based on compliance with the Rules for Classification
of Ships, Pt.7 Ch.3 Sec.1.Ch.2 Sec.6
S. Environmental
Notations
Ch.2 Sec.6
S 100 Additional oil pollution prevention
measures fuel oil systems
Ch.2 Sec.6 S
101 GeneralUnits arranged and equipped with additional oil pollution
prevention measures for the fuel oil system may be given the class
notation OPP-F.
Ch.2 Sec.6 S
102 Technical requirements
The requirements given in the Rules for Classification of
Ships, Pt.6 Ch.1 Sec.6, shall be complied with for assignment of
the class notations.
Ch.2 Sec.6
S 200 CLEAN or CLEAN DESIGN
Ch.2 Sec.6 S
201 GeneralUnits arranged and equipped with the aim to reduce the environmental
impact from emissions to air, discharges to sea, and deliveries
to shore from Units may be given the additional class notations: CLEAN or CLEAN DESIGN.
Ch.2 Sec.6 S
202 Technical requirements
The requirements given in the Rules for Classification of
Ships, Pt.6 Ch.12 Sec.1, shall be complied with for assignment of
the class notations.
Ch.2 Sec.6
S 300 Vapour Control Systems (VCS)
Ch.2 Sec.6 S
301 GeneralUnits and installations fitted with systems for control of
vapour emission from cargo tanks may be given one of the following
additional class notations: VCS-1,
VCS-2 or VCS-3.
Ch.2 Sec.6 S
| Table T1 VCS class
notations |
| Notation | Description |
| VCS-1 | Basic installation (meeting IMO MSC/Circ.585) |
| VCS-2 | VCS-1 + overfill
alarm (meeting USCG CFR 46 part 39) |
| VCS-3 | VCS-2 + installation
for onboard vapour processing |
Ch.2 Sec.6 S
302 Technical requirementsThe requirements given in the Rules for Classification of
Ships, Pt.6 Ch.10 Sec.1, shall be complied with for assignment of
the class notations.
Ch.2 Sec.6
S 400 Recyclable
Ch.2 Sec.6 S
401 The additional class notation RECYCLABLE may be given
to offshore units to document early compliance with the requirements
for IHM Part 1 set forth by the IMO Hong Kong Convention for the
Safe and Environmentally Sound Recycling of Ships.
Ch.2 Sec.6 S
402 The requirements given in the Rules for Classification of
Ships, Pt.6 Ch.27, shall be complied with for assignment of the
class notations.Ch.2 Sec.6
T. Integrated Software Dependent
Systems
Ch.2 Sec.6
T 100 General
Ch.2 Sec.6 T
101 Units built and tested in compliance with the requirements
of DNV-OS-D203 may be assigned one of the optional class notations
for integrated software-dependent systems shown in Table T1.Ch.2 Sec.6 T
| Table T1 ISDS Class
notations |
| Notation | Description |
| ISDS-1[system1,...,system
n] | Units having undergone enhanced software-dependent
system integration for the system(s) according to DNV-OS-D203, at
confidence level 1. |
| ISDS-2[system1,...,system
n] | Units having undergone enhanced software-dependent
system integration for the system(s) according to DNV-OS-D203, at
confidence level 2. |
| ISDS-3[system1,...,system
n] | Units having undergone enhanced software-dependent
system integration for the system(s) according to DNV-OS-D203, at
confidence level 3. |
Ch.2 Sec.6
U. Special Feature Notations
Ch.2 Sec.6
U 100 General
Ch.2 Sec.6 U
101 Special feature notations provide information regarding special
design assumptions, arrangements or equipment which is not covered
by other class notations. Requirements related to special feature
notations currently in use are described in this sub-section.Ch.2 Sec.6
U 200 Special feature notation SUB
Ch.2 Sec.6 U
201 SUB is
applicable for column-stabilised units strengthened for operation
when resting on the seabed.
Ch.2 Sec.6 U
202 Requirements for air gap, safety against overturning stability,
local reinforcement of bottom of pontoons, etc. will be especially
considered for the "resting on seabed" condition. Ch.2 Sec.6
U 300 Special feature notation NON-SELFPROPELLED
Ch.2 Sec.6 U
301 Units not fitted with propulsion and steering arrangement
for independent transit will be assigned special feature notation NON-SELFPROPELLED.
Ch.2 Sec.6 U
302 For NON-SELFPROPELLED units
the survey scopes for steering gear, tailshaft and thrusters for propulsion
may be adjusted in accordance with the intended use (e.g. for DYNPOS-AUTS, POSMOOR, as auxiliary
installation, or not used at all).Ch.2 Sec.6
U 400 Tailshaft monitoring - TMON
Ch.2 Sec.6 U
401 When the following design requirements are fulfilled, the
class notation TMON (tailshaft
condition monitoring survey arrangement) may be obtained:| — | the stern tube bearings are oil lubricated |
| — | high temperature alarm is fitted on aft stern tube bearing
(2 sensors or one easily interchangeable sensor located in the bearing
metal near the surface, in way of the area of highest load, which
normally will be the bottom area (5 to 7 o'clock) in the
aft third of the bearing) |
| — | where one interchangeable sensor is fitted one spare
sensor is to be stored on board |
| — | the setting of the stern tube high temperature alarm
is normally not to exceed 65°C. Higher alarm set point may be accepted
upon special consideration |
| — | the sealing rings in the stern tube sealing box must
be replaceable without shaft withdrawal or removal of propeller |
| — | arrangement for bearing wear down measurement is fitted |
| — | electrical grounding of the shafting is mandatory |
| — | the system must allow representative oil samples to
be taken for analysis of oil quality under running conditions. Location
where samples are to be taken shall be clearly pointed out on system
drawing and test cock to be fitted with signboard. A written procedure
for how to take oil samples shall be submitted. |
Ch.2 Sec.6 U
402 A test kit for monitoring of possible water content in the
stern tube lubricating oil is to be provided on board. The water
content is normally not to exceed 2% by volume. If water
content above 2% is detected appropriate, action shall
be taken.
Ch.2 Sec.6 U
403 Oil lubricated propeller shafts with roller bearings arranged
in the stern tube may be granted TMON. Additional
requirements for such arrangements are:- The bearing temperature is
to be monitored. Two sensors (or one sensor easily interchangeable
at sea) are to be fitted. Temperature alarm level should normally
not exceed 90°C.
- Vibration monitoring is required for roller bearings.
Handheld probes are not accepted; magnetic, glue, screw mountings
or equivalent are compulsory.
- Vibration signal is to be measured as velocity or acceleration.
Integration from acceleration to velocity is allowed.
- The vibration analysis equipment must be able to detect
fault signatures in the entire frequency range for the monitored
bearing. A reference level under clearly defined operational conditions
is to be established. The reference level shall be used as basis
for establishing an alarm level.
- For podded propulsors (where the propeller shaft is
a part of the electrical motor rotor) all roller bearings for the
propeller shafting are to be monitored with both oil temperature
sensors and vibration monitoring.
- The water content is normally not to exceed 0.5%.
Ch.2 Sec.6
U 500 Special Feature Notation BIS
Ch.2 Sec.6 U
501 Units prepared for in-water survey during building may be
given the notation BIS.
Ch.2 Sec.6 U
502 The technical requirements in the Rules for Classification
of Ships, Pt.3 Ch.1 Sec.1 D, shall be complied with. Ch.2 Sec.6
V. Summary of Reference Documents
for Additional Class Notations
Ch.2 Sec.6
V 100 General
Ch.2 Sec.6 V
101 Rules and standards which shall be applied for assignment
of system and special facility class notations are summarised in
Table V1.Ch.2 Sec.6 V
| Table V1 Summary of
reference documents for system and special facility notations |
| Notation | Description |
| CLEANCLEAN DESIGN | Rules for Classification
of Ships, Pt.6 Ch.12 Sec.1 |
| COMF- V(crn) (or) C(crn) (or) V(crn)C(crn)) | Rules for Classification
of Ships Pt.5 Ch.12 |
| CRANE | Rules for Classification
of Ships Pt.6 Ch.1 Sec.3 |
DEICE
DEICE-C | Rules for Classification
of Ships Pt.6 Ch.1 Sec.5 |
DRILL
DRILL(N)
DRILL(US) | DNV-OS-E101
DNV-OSS-201
DNV-OSS-101 | DSV-SURFACE DSV-SAT | Rules for Classification
of Ships Pt.5 Ch.14 DYNPOS-AUTS
DYNPOS-AUT
DYNPOS-AUTR
DYNPOS-AUTRO | Rules for Classification
of Ships Pt.6 Ch.7 | | DYNPOS-ER | Rules for Classification of Ships Pt.6 Ch.26 | | DPS
1-3 | Rules for Classification of Ships Pt.6 Ch.7 | E0
ECO | Rules for Classification
of Ships Pt.6 Ch.3 | F-A
F-M
F-AM | Rules for Classification
of Ships Pt.6 Ch.4 | FIRE
FIGHTER I
FIRE FIGHTER II
FIRE FIGHTER III | Rules for Classification
of Ships Pt.5 Ch.7 Sec.5 | | FMS | DNV-RP-C206 "Fatigue
Methodology for Offshore Ships" | HELDK
HELDK
S
HELDK
SK | DNV-OS-E401 | | HMON
(...) | Rules for Classification
of Ships Pt.6 Ch.11 | ICE-T
ICE-L | Rules for Classification
of Ships Pt.5 Ch.1 Sec.3 | ISDS-1
ISDS-2
ISDS-3 | DNV-OS-D203 | | LCS-DC | Rules for Classification
of Ships Pt.6 Ch.9 Sec.4 | | OPP-F | Rules for Classification
of Ships, Pt.6 Ch.1 Sec.6 | POSMOOR
POSMOOR-V
POSMOOR-TA
POSMOOR-ATA | DNV-OS-E301 | | SBM | Rules for Classification
of Ships Pt.7 Ch.3 Sec.1 | | TEMPSTORE | DNV-OS-A101, DNV-OS-D101, DNV-OS-D301 | VCS-1
VCS-2
VCS-3 | Rules for Classification
of Ships, Pt.6 Ch.10 Sec.1 | | VIBR | Rules for Classification
of Ships Pt.6 Ch.15 Sec.1 | | WELL | DNV-OS-E101 | | WELLTEST | DNV-OS-E101 | | WINTERIZEDWINTERIZED ARCTIC | Rules for Classification
of Ships Pt.5 Ch.1 Sec.6 | | |
![[-]](/dwicons/i_colpse.gif)