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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.1: Introduction |
Ch.1
| — | Chapter 1: providing general information about classification principles and procedures |
| — | Chapter 2: providing design and construction requirements for the newbuilding phase |
| — | Chapter 3: providing requirements for maintenance of class in the operational phase. |
| — | ship-shaped units |
| — | column-stabilised units |
| — | self-elevating units |
for the following services:
| — | drilling |
| — | well intervention |
| — | accommodation |
| — | heavy-lifting |
| — | general offshore support. |
Voluntary additional class notations may also be assigned
covering special service, equipment or systems, e.g. DRILL denoting a classed
drilling plant.
Ch.1 Sec.1 B
204 BOP: Blow out preventer.
Ch.1 Sec.1 B
205 Builder: Signifies
the party contracted to build a vessel in compliance with the Society's
rules.
Ch.1 Sec.1 B
206 Certificate: A document
confirming compliance with the Society's rules or with
other rules and regulations for which the Society has been authorized
to act.
Ch.1 Sec.1 B
207 Certification: A service
confirming compliance with applicable requirements on the date that
the survey was completed.
Ch.1 Sec.1 B
208 Certification of materials and
components (CMC): The activity of ensuring that materials,
components and systems used in vessels to be classed by the Society
comply with the rule requirements. The scope of classification re-quires
that specified materials, components and systems intended for the
vessel are certified. Depending on the categorisation, certification
may include both plan approval and survey during production and/or
of the final product.
Ch.1 Sec.1 B
209 Class: Class is assigned
to and will be retained by vessels complying with applicable requirements
of the Society's rules.
Ch.1 Sec.1 B
210 Classification: A service
which comprises the development of independent technical standards
for vessels - class rules and standards, and to verify compliance
with the rules and standards throughout the vessels' life.
Ch.1 Sec.1 B
211 Close-up examination: An
examination where the details of structural components are within
the close visual inspection range of the surveyor, i.e. preferably
within reach of hand.
Ch.1 Sec.1 B
212 Coating conditions:
| — | "GOOD": Condition with only minor spot rusting. |
| — | "FAIR": Condition with local breakdown at edges of stiffeners and weld connections and/or light rusting over 20% or more of areas under consideration, but less than as defined for POOR condition. |
| — | "POOR": Condition with general breakdown of coating over 20% or more of areas or hard scale at 10% or more of areas under consideration. |
Surveys required to be concurrently completed shall have the same date of completion.
A survey required to be carried out in conjunction with or
carried out as part of another survey shall be completed on or before
the completion of the other survey, however, within the time window
for that survey.
Ch.1 Sec.1 B
215 Condition of Class (CC): Constitutes
a requirement that specific measures, repairs or surveys shall be carried
out within a specific time limit in order to retain class.
Ch.1 Sec.1 B
216 Condition on behalf of the flag
administration (CA):
Constitutes specific measures, repairs or surveys that shall be carried out within a specific time limit in order to retain the statutory certificate.
A CA will be issued only when the Society has been authorised
to carry out statutory surveys on behalf of the flag ad-ministration.
Ch.1 Sec.1 B
217 Contract: The specific
agreement between DNV and the client. It defines the extent of services
requested by the client, and is concerned with:
| — | the classification of vessels or installations, both new buildings and in operation |
| — | statutory work carried out on behalf of national maritime authorities |
| — | equipment and materials. |
The foundation operates through the limited company Det Norske
Veritas AS, which is registered in Norway and operates through a
worldwide network of offices.
Ch.1 Sec.1 B
222 ESD: Emergency Shut
Down.
Ch.1 Sec.1 B
223 The EC Signifies the
Executive Committee of the Society.
Ch.1 Sec.1 B
224 "Exceptional circumstances" means
unavailability of dry-docking facilities; unavailability of repair facilities;
unavailability of essential materials, equipment or spare parts;
or delays incurred by action taken to avoid severe weather conditions.
Ch.1 Sec.1 B
225 Flag administration: The
maritime administration of a vessel's country of registry.
Ch.1 Sec.1 B
226 FMECA: Failure Mode
Effect and Consequence Analysis.
Ch.1 Sec.1 B
227 FUI: Fatigue Utilisation
Factor.
Ch.1 Sec.1 B
228 Guidance note: Contain
advice which is not mandatory for the assignment or retention of
class, but with which the Society, in light of general experience,
advises compliance.
Ch.1 Sec.1 B
229 IACS: The International
Association of Classification Societies. Unified rules, interpretations,
guidelines and recommendations may be found on www.iacs.org.uk.
Ch.1 Sec.1 B
230 IACS member society: A
classification society being a member of IACS.
Ch.1 Sec.1 B
231 IMO: The International
Maritime Organization.
Ch.1 Sec.1 B
232 Independent tank: Self-supporting
tank which does not form part of the vessel's hull and
does not contribute to the hull strength.
Independent gravity tank is a tank with design vapour pressure not exceeding 0.7 bar.
Pressure vessel is
a tank with design gas or vapour pressure exceeding 0.7 bar.
Ch.1 Sec.1 B
233 ISO: Signifies the
International Organisation for Standardization.
Ch.1 Sec.1 B
234 HP: High Pressure.
Ch.1 Sec.1 B
235 Lay-up: A terminology
used for vessels that are out of commission. In this state the offshore
vessel may be at anchorage or permanently moored in a safe harbour.
Ch.1 Sec.1 B
236 LRFD methodology: Load
and resistance factor design methodology.
Ch.1 Sec.1 B
237 Manufacturer: Signifies
the entity that manufactures the material or product, or carries
out part production that determines the quality of the material
or product, or does the final assembly of the product.
Ch.1 Sec.1 B
238 Mechanical Completion (MC): Verification
that the components, equipment and the systems are constructed,
installed and tested in accordance with applicable drawings and
specifications and are ready for testing and commissioning in a
safe manner.
Ch.1 Sec.1 B
239 Memorandum to Owner (MO): Constitutes
information related to the ship, its machinery and equipment or
to rule requirements.
A MO will be issued in relation to information that does not
require any corrective action or survey.
Ch.1 Sec.1 B
240 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 location, and which can be relocated without major dismantling
or modification.
Ch.1 Sec.1 B
241 OEM: Original Equipment
Manufacturer.
Ch.1 Sec.1 B
242 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 B
243 Overall examination: An
examination intended to report on the overall condition of the structure.
Ch.1 Sec.1 B
244 Owner: Signifies the
registered owner or manager of the vessel or any other organization
or person who has assumed the responsibility for operation of the
vessel and who on assuming such responsibility has agreed to take
over all the duties and responsibilities.
Ch.1 Sec.1 B
245 Plan approval: Signifies
a systematic and independent examination of drawings, design documents
or records in order to verify compliance with the rules or statutory
requirements.
Plan approval will be carried out at the discretion of the
Society, which also decides the extent and method of examination.
Ch.1 Sec.1 B
246 Plan approval staff: Personnel
authorized to carry out plan approval and to conclude whether or
not compliance has been met.
Ch.1 Sec.1 B
247 Prompt and thorough repair: A
permanent repair completed at the time of survey to the satisfaction
of the surveyor, therein removing the need for the imposition of
any associated condition of class.
Ch.1 Sec.1 B
248 Quality audit: A systematic
and independent examination to determine whether established work processes
and quality systems are adhered to.
Ch.1 Sec.1 B
249 Quality system: Signifies
both the quality management system and established production and
control procedures.
Ch.1 Sec.1 B
250 Quality Survey Plan (QSP): A
plan that systematically identifies activities related to the classification project
(e.g., Construction, installation, testing, mechanical completion,
pre-commissioning, testing and commissioning) and the extent of
involvement each party (i.e., Yard's QC, Yards' QA,
DNV and Owners[if desired]) will undertake. Such
a plan needs to be submitted to the Society for approval prior to
commencement of classification projects.
Ch.1 Sec.1 B
251 RBI: Risk Based Inspection.
Ch.1 Sec.1 B
252 RCM: Reliability Centred
Maintenance.
Ch.1 Sec.1 B
253 Recognised classification society: A
classification society which is a full or associate member of IACS.
Ch.1 Sec.1 B
254 Reliability: The ability
of a component or a system to perform its required function under
given conditions for a given time interval.
Ch.1 Sec.1 B
255 Representative tanks: Those
tanks which are expected to reflect the condition of other tanks
of similar type and service and with similar corrosion protection
systems. When selecting representative tanks account shall be taken
of the service and repair history on board and identifiable critical
and/or suspect areas.
Ch.1 Sec.1 B
256 Retroactive Requirement (RR): Constitutes
a class or statutory requirement that will enter into force for certain
vessel's in operation and under construction at a given
date or an upcoming survey. The RR will specify the required actions
to be taken in order to retain class or statutory certification.
RR related to statutory certification will be issued only
if the Society has been authorised to carry out statutory certification
on behalf of the flag administration.
Ch.1 Sec.1 B
257 Review: Signifies a
systematic examination of drawings, design documents or records
in order to evaluate their ability to meet requirements, to identify
any problems and to pro-pose necessary actions.
Ch.1 Sec.1 B
258 The Rules: All rule
requirements accepted by the EC as basis for classification.
Ch.1 Sec.1 B
259 Sighting survey: A
survey to confirm that the relevant construction or the equipment
is in a satisfactory condition and, as far as can be judged, will
remain so until the postponed survey has been carried out.
Ch.1 Sec.1 B
260 Significant repair: A
repair where machinery is completely dismantled and re-assembled.
Significant repairs will, furthermore, be cases of repairs after
serious damage to machinery.
Ch.1 Sec.1 B
261 The Society: Signifies
Det Norske Veritas AS.
Ch.1 Sec.1 B
262 Safety systems: Systems,
which are provided to prevent, detect, control or mitigate the effects
of an accidental event. Failure of a safety system could lead to
the development or escalation of an accidental event.
Ch.1 Sec.1 B
263 Spaces: Separate compartments
including holds and tanks.
Ch.1 Sec.1 B
264 Statement of compliance: A
document confirming compliance with specified requirements. Such documents
may be issued by the Society in cases where it has not been authorised
to certify compliance.
Ch.1 Sec.1 B
265 Statutory certificates: IMO
convention certificates issued on behalf of, or by, national authorities.
Ch.1 Sec.1 B
266 Statutory survey: Survey
carried out by or on behalf of a flag administration.
Ch.1 Sec.1 B
267 Substantial corrosion: Extent
of corrosion such that assessment of corrosion pattern indicates
wastage in excess of 75% of allowable margins, but within
acceptable limits.
Ch.1 Sec.1 B
268 Survey: Signifies a
systematic and independent examination of a vessel, materials, components
or systems in order to verify compliance with the rules and/or
statutory requirements.
Surveys will be carried out on the vessel, at the construction
or repair site as well as at sub-suppliers and other locations at
the discretion of the Society, which also decides the extent and
method of control.
Ch.1 Sec.1 B
269 Survey staff: Personnel
authorized to carry out surveys and to conclude whether or not compliance
has been met.
Ch.1 Sec.1 B
270 Suspect areas: Areas
showing substantial corrosion and/or are considered by
the surveyor to be prone to rapid wastage.
Ch.1 Sec.1 B
271 SWL: Safe Working Load.
Ch.1 Sec.1 B
272 Temporary conditions: Design
conditions not covered by operating conditions, e.g. conditions
during fabrication, mating and installation phases, dry transit
phases.
Ch.1 Sec.1 B
273 Temporary equipment: equipment
intended for use on installations and which is covered by class, requires
hook-up to systems covered by class and/or is a significant
deck load and/or may pose a risk for fire, explosion and
escape routes.
Ch.1 Sec.1 B
274 Tentative rules and standards: Apply
to new fields to which DNV reserves the right to make adjustments during
a period in order to obtain the purpose intended.
Ch.1 Sec.1 B
275 Transit conditions: All
wet vessel movements from one geographical location to another.
Ch.1 Sec.1 B
276 Transverse section: Section
which includes all longitudinal members such as plating, longitudinals
and girders at the deck, side, bottom, inner bottom and hopper side
plating, longitudinal bulkhead and bottom plating in top wing tanks,
as applicable.For transversely framed vessels, a transverse section
includes adjacent frames and their end connections in way of transverse
sections.
Guidance note: ---e-n-d---o-f---G-u-i-d-a-n-c-e---n-o-t-e---
Adjacent frames include the frames located just forward and
aft of the transverse section.
Ch.1 Sec.1 C
| Table C1 DNV reference documents | |
| Reference | Title |
| DNV-OS-A101 | Safety Principles and Arrangement |
| DNV-OS-B101 | Metallic Materials |
| DNV-OS-C101 | Design of Offshore Steel Structures, General |
| DNV-OS-C103 | Structural Design of Column Stabilised Units (LRFD method) |
| DNV-OS-C104 | Structural Design of Self Elevating Units (LRFD method) |
| DNV-OS-C107 | Structural Design of Ship-shaped Drilling and Well Service Units |
| DNV-OS-C201 | Structural Design of Offshore Units (WSD method) |
| DNV-OS-C301 | Stability and Watertight Integrity |
| DNV-OS-C401 | Fabrication and Testing of Offshore Structures |
| DNV-OS-D101 | Marine and Machinery Systems and Equipment |
| DNV-OS-D201 | Electrical Installations |
| DNV-OS-D202 | Automation, Safety, and Telecommunication Systems |
| DNV-OS-D301 | Fire Protection |
| DNV-OS-E101 | Drilling Plant |
| DNV-OS-E201 | Hydrocarbon Production Plant |
| DNV-OS-E301 | Position Mooring |
| DNV-OS-E401 | Helicopter Decks |
| DNV-OS-J301 | Standard for Classification of Wind Turbine Installation Units |
| DNV-OSS-305 | Rules for Certification and Verification of Diving Systems |
| DNV-RP-A201 | Plan Approval Documentation Types - Definitions |
| Standards for Certification No. 2.22 | Lifting Appliances |
| SHIP | Rules for Classification of Ships |
Ch.1 Sec.1 C
| Table C2 Non-DNV normative references | |
| Reference | Title |
| IACS | Shipbuilding and Repair Quality Standard, ref. www.iacs.org.uk |
Ch.1 Sec.1 D
| Table D1 DNV informative references | |
| Reference | Title |
| DNV-OSS-102 | Rules for Classification of Floating Production, Storage and Loading Units |
| DNV-OSS-201 | Verification for Compliance with Norwegian Shelf Regulations |
| DNV-OSS-202 | Verification for Compliance with UK Shelf Regulations |
| Standard for Certification No. 1.2 | Type Approval |
| Classification Note 72.1 | Allowable Thickness Diminution for Hull Structures |
Ch.1 Sec.1 D
| Table D2 Other references | |||||||||||||||||
| Reference | Title | API RP 2I | In-service inspection of mooring hardware for
floating drilling units | API RP 8B | Inspection, maintenance, repair, and re-manufacture
of hoisting equipment | BS 5430-1 | Periodic inspection, testing and maintenance
of transportable gas containers (excluding dissolved acetylene containers).
Specification for seamless steel containers of water capacity 0.5
litres and above | ISO 3166 | Codes for the representation of names of countries
and their subdivisions | ISO 4309 | Cranes - Wire ropes - Care, maintenance, installation,
examination and discard | ISO 9001 | Quality management systems - Requirements | ISO 17359 | Condition monitoring and diagnostics of machines
- General guidelines | PD 5500(Previous BS 5500) | Specification for unfired fusion welded pressure
vessels | |
Ch.1 Sec.1 E
| Table E1 Abbreviations | |||||||||||||||||||||||||||||||||||||||||
| Abbreviation | In full | API | American Petroleum Institute | BS | British Standard (issued by British Standard
Institution) | DFF | Design Fatigue Factors | DNV | Det Norske Veritas | DP | Dynamic Positioning | EDP | Emergency Disconnect Package | IC | Inspection Category | IIP | In service Inspection Program | ISO | International Organisation for Standardisation | LRFD | Load and Resistance Factor Design | LRP | Lower Riser Package | MPI | Magnetic Particle Inspection | NDT | Non-Destructive Testing | OS | Offshore Standard | OSS | Offshore Service Specification | RCM | Reliability Cantered Maintenance | RP | Recommended Practice | SCF | Stress Concentration Factor | SHIP | Rules for Classification of Ships | WSD | Working Stress Design | |
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