Features such as full-text search and active cross-references will assist you in locating relevant content quickly. Login to Veracity to setup e-mail notifications for new or changed rules and standards. The database contains updated and consolidated IMO documents including resolutions from the Assembly 31st session, MEPC committee 76th session, MSC committee rd session - and circulars and interpretations including October The database contains updated and consolidated IMO documents including resolutions from the Assembly 31st session, MEPC committee 75th session, MSC committee nd session - and circulars and interpretations including April Shibboleth is an access management service that d single sign-on protected resources.
You either do not have a subscription or your subscription has expired. These are calculated as follows. You do not have access to this content. This standard, based on limit state design principles, are presented on the LRFD Load and Resistance Factor Design format, allowing different riser design alternatives to take into account the environmental conditions.
Note that the DNV OS F LRFD result, when the model is in the static state and the functional load is specified by f current model, will therefore have no environmental load contribution.
This design criterion makes use of single safety factor on dng Mises stress. The loads can then be separated:. Check Out Now Continue Browsing. Related Content Customize your page view by dragging and repositioning the boxes below. DNV OS Fsection 5, D states that, if the bending moment can be assumed secondary, the bending ow used in the code checks may be multiplied by a condition factor.
In order to calculate the results, derived values for burst resistance pressure and collapse pressure are required. D Installation Short circuit proof installation For low voltage installations, short circuit proof installation means one of the following methods: — bare conductors mounted on isolating supports — single core cables i.
D Area definitions Open deck Open deck is a deck that is completely exposed to the weather from above or from at least one side. D Hazardous area Area definitions A hazardous area is an area zones and spaces containing a source of hazard and or in which explosive gas and air mixture exists, or may normally be expected to be present in quantities such as to require special precautions for the construction and use of electrical equipment and machinery.
This includes at least: — Ex-protection type and Ex certificate number — gas and equipment group, according to Table A1 — temperature class, according to Table A2. Guidance note: Emergency source of electrical power may be generator s or battery ies. This includes the main electrical generators, batteries, associated transforming equipment if any, the main switchboards MSB , distribution boards DB and all cables from generators to the final consumer.
This includes emergency generators, batteries, associated transforming equipment if any, the transitional source of emergency power, the emergency switchboards ESB , emergency distribution boards EDB and all cables from the emergency generator to the final consumer. Additional un-insulated conductors may be included in the cable. In a Class 2 cable the conductor is made up by a minimum number of strands.
In a Class 5 cable the conductor is made up by many small strands with a maximum size according to IEC Normally, these types of battery have wet electrolyte with the possibility to check and refill electrolyte levels and to take the specific gravity of the electrolyte with a hydrometer.
Normally, these are dry type or gel type batteries, with no refill or maintenance of electrolyte possible. With valve regulated batteries, the amount of escaping gas is normally very low. However, in the case where a battery, of this type, has been abnormally or excessively charged, then the volume of escaping gases can be comparable with the vented types.
Low voltage: rated voltages of more than 50 V up to and inclusive 1 V with rated frequencies of 50 Hz or 60 Hz, or direct-current systems where the maximum voltage does not exceed 1 V. High voltage: rated voltages of more than 1 kV and up to and inclusive 15 kV with rated frequencies of 50 Hz or 60 Hz, or direct-current systems with the maximum voltage under rated operating conditions above 1 V.
Guidance note: Normally, all switchboards between the main source of electrical power and inclusive the first level of switchboards for power distribution, to small power consumers, will be considered to be main switchboards MSBs i. Cubicles for other system voltages attached to a main switchboard are considered part of the main switchboard.
Guidance note: Normally all switchboards between the emergency source of electrical power and inclusive the first level of switchboards, for power distribution to small power consumers, will be considered to be emergency switchboards ESBs i. D Components and related expressions Definitions of words used in relation to electrical components and equipment a For definitions of terms related to switchgear and controlgear, see IEC for low voltage, and IEC and IEC for high voltage equipment.
A component is ready made by a component manufacturer, for use by an equipment manufacturer. The term component is also used for smaller free-standing equipment like connection boxes, sensors, switches etc. Determination of the tracking index shall be done in accordance with the requirements in IEC , and is normally done by type testing of the material by the manufacturer, before the material is available in the market.
Introduction A Application The requirements of this standard have been specifically aimed at mobile offshore units and floating offshore installations of the ship-shaped, self-elevating and column-stabilised design types, but may also be applied to other types of floating constructions.
General A Design principle General requirements a Electrical installations shall be such that the safety of passengers, crew and ship from electrical hazards, is ensured. Exceptions are given in C Exemptions are made for one of redundant consumers required for dead ship recovery.
The primary supply shall be from the main system. Guidance note: Requirements to arrangements of main and emergency power supply systems with respect to fire, flooding or other casualty are given in I The connection to the hull shall be so arranged that any circulating current in the earth connections do not interfere with radio, radar, communication and control equipment circuits.
Such means shall be for manual operation only. Transformer neutrals and generator neutrals shall not be simultaneously earthed in the same distribution system at same voltage level. On distribution transformers with star connected primary side, the neutral point shall not be earthed.
TN-C-S- system. Electrical equipment in directly earthed neutral or other neutral earthed systems shall withstand the current due to single phase fault against earth for the time necessary to trip the protection device. It shall be assured that at least one source neutral to ground connection is available whenever the system is in the energised mode.
For divided systems, connection of the neutral to the earth shall be provided for each section. IEC Item 6. Outgoing final sub circuits i. The bonding of isolated components inside the structure is not generally necessary, except in fuel tanks.
The bonding path shall have sufficient cross-sectional area to carry the maximum current likely to be imposed on it without excessive voltage drop. This earth bar shall be connected to a copper plate with a minimum area of 0. A System voltages and frequency General a Electric distribution systems shall operate within the voltage and frequencies given in to This also applies to distribution systems where one or more generator prime movers are driving other equipment.
However, the compensation shall not exceed an amount equal to ten times the fee charged for the service in question, provided that the maximum compensation shall never exceed USD 2 million. In this provision "Det Norske Veritas" shall mean the Foundation Det Norske Veritas as well as all its subsidiaries, directors, officers, employees, agents and any other acting on behalf of Det Norske Veritas.
Text affected by the main changes in this edition is highlighted in red colour. However, if the changes involve a whole chapter, section or sub-section, normally only the title will be in red colour. For further information, see www. Editorial corrections In addition to the above stated main changes, editorial corrections may have been made.
A Special considerations for conversions Class notations Technical guidance for classification Hull and topside structures Additional services B Introduction to offshore classification The classification system Classification support C Mooring equipment acceptance standard guidance Should: Verbal form used to indicate that among several possibilities one is recommended as particularly suitable, without mentioning or excluding others, or that a certain course of action is preferred but not necessarily required.
May: Verbal form used to indicate a course of action permissible within the limits of the document. Today only the highest class is assigned, comprising the main class 1A1 for mobile offshore units and OI for permanently placed installations, together with an obligatory additional class notation, e.
Oil Production Unit, where applicable. Voluntary additional class notations may also be assigned covering special service, equipment or systems, e. PROD denoting a classed hydrocarbon production plant. The scope of classification re-quires that specified materials, components and systems intended for the vessel are certified. 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.
A CA will be issued only when the Society has been authorised to carry out statutory surveys on behalf of the flag ad-ministration. It defines the extent of services requested by the customer, 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. Unified rules, interpretations, guidelines and recommendations may be found on www. Independent gravity tank is a tank with design vapour pressure not exceeding 0. Pressure vessel is a tank with design gas or vapour pressure exceeding 0. These do not preclude the use of other alternative solutions but these shall be documented and approved for compliance to the principal requirement equivalent to the original interpretation.
In this state the offshore vessel may be at anchorage or permanently moored in a safe harbour. A MO will be issued in relation to information that does not require any corrective action or survey. Plan approval will be carried out at the discretion of the Society, which also decides the extent and method of examination.
Such a plan needs to be submitted to the Society for approval prior to commencement of classification projects. 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. Significant repairs will, furthermore, be cases of repairs after serious damage to machinery. Such documents may be issued by the Society in cases where it has not been authorised to certify compliance. 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.
Normally towing is performed for units without any propulsion for re- location compare with emergency towing as defined in [2. For transversely framed vessels, a transverse section includes adjacent frames and their end connections in way of transverse sections. Guidance note: Adjacent frames include the frames located just forward and aft of the transverse section.
See Sec. Specification for seamless steel containers of water capacity 0. Classification has gained worldwide recognition as representing an adequate level of safety and quality. The aim is to verify that the required safety standard is built in, observed and maintained. Unless stated otherwise, the coming into force date shall be six 6 months after the date of publication. Unless stated otherwise, the coming into force date for documents referenced by this OSS as technical basis for classification shall be six 6 months after the date of publication.
Subsequent amendments not made mandatory according to [1. The alternative solution shall be adequately documented and will be reviewed for acceptance on the basis of relevant references set forth by DNV.
Approval may be revoked if subsequent information indicates that the chosen alternative is not satisfactory. In cases where detailed requirements are not given in the rules, specific solutions or decisions approved by DNV and its surveyors shall be based on the principles of the rules, and shall give a safety standard equivalent to that of the rules.
Such agreed alternative arrangements shall be specified in the class agreement. The safety objectives inherent in the rules are achieved in conjunction with this service. Using the rules without the corresponding classification services may have the result that safety objectives are not met. A note to this effect may be included in the Appendix to the classification certificate. In addition, classification is based on the following: Valid statutory certificates For flagged vessels and installations the statutory certificates of the applicable international conventions shall be valid at all times, and the surveys prescribed in the conventions shall be carried out within the time windows prescribed.
Maintenance of the vessel or installation and its equipment It is assumed that the vessel, machinery installations and equipment are maintained at a standard complying with the requirements of the rules. Installed systems or equipment carried on board in excess of the rule requirements, but otherwise covered by the rules, shall either be maintained in accordance with the rules, or be removed or disconnected in such a way as to ensure that the installed system or equipment cannot be used.
Handling of the vessel or installation It is assumed that the vessel, machinery installations and equipment are adequately manned and competently handled. Class conditions regarding the use of the vessel shall be observed.
Recording of lightweight and centre of gravity The data for lightweight and centre of gravity C. It is the customer's responsibility to document or demonstrate compliance with the Society's rules. Information may be made available by submitting documents to the Society or by permitting surveys performed by the Society at the customer's premises, onboard the vessel or at the premises of the customer's sub-contractors.
Revisions of documents are therefore to be submitted to DNV to the extent such revisions may influence decisions and requirements relating to class. Guidance note: Table indicates which parties will be entitled to various kinds of information. The owners will be informed accordingly. However, certificates with possible related CC and MO will normally be received by the builder upon class assignment.
The premises and objects to be inspected shall as agreed be cleaned and prepared for inspection. The classification service is not performed in substitution of other parties' role or obligations. Nothing contained herein or in any certificate, report or document issued in connection with or pursuant to these rules, shall relieve any designer, engineer, builder, manufacturer, yard, seller, supplier, owner, operator or other parties from any obligations or consequences of default whatsoever.
In particular, compliance with the rules does not imply acceptance or commissioning of a vessel. This is the exclusive responsibility of the owner. Any document issued by DNV in relation to surveys performed reflects the condition of the vessel at the time of survey. It is the responsibility of the owner to maintain the condition of the vessel as required by the rules between surveys.
The expenses incurred shall be paid by the customer. Statutory certification includes inter alia approval, survey and the issuance of statutory certificates.
The Society assumes the right to withdraw class if statutory certificates are not issued as described in this paragraph. Such selective piecemeal application of a code or standard shall be verified. Marine and machinery installations and equipment Machinery installations and equipment, including their related auxiliary functions, with respect to strength and performance as applicable to the following main functions: — power generation — position keeping — propulsion as applicable — steering if applicable — fire and flammable gas detection, fire protection and extinguishing — drainage and bilge pumping — ballasting — emergency shutdown systems as applicable.
Other machinery installations, regardless of their contribution to the main functions stated above, when located in enclosed hull compartments below the damage water line. Other installations stated in the rules. Such special class arrangements may be acceptable provided it can be demonstrated that areas and items not covered by classification have, or will be, designed, constructed and maintained to an appropriate recognised standard.
The involvement by DNV will be specified in the class agreement and reflected in the class notations for the installation. The notations currently in use are given in Table Table Class notations related to basic design Design Survey requirements requirements Ch. The Deep Draught Ch. A structure with hull of sufficient buoyancy for safe transport Self-elevating which is raised above sea surface on legs supported by the sea bed Ch.
Monohull ship and barge structures having displacement hulls Ship-shaped Ch. Tension Leg A buoyant structure connected to a fixed foundation by Ch. Mobile Offshore A structure not properly characterised by the above notations.
Notations currently in use are given in Table Table Class notations related to special features Class notation Description Design requirements Ch. The purpose of the notation Limitation of Class is to indicate such limitations, if applicable.
Example: Structure: Classification is limited to cover main structure. Verified for compliance with DNV's interpretation of relevant Norwegian shelf state requirements nce with DNV's interpretation of relevant Norwegian coastal state requirements.
The Society reserves the right to decline a request for classification. Guidance note: Evidence may incorporate successful outcome of classification projects carried out for another IACS member society or successful outcome of design projects of similar nature.
Requirements for approval of welding shops, welders, manufacturers of welding consumables, welding consumables and welding procedures are given in DNV-OS-C and by a series of detailed approval programmes.
The results of the assessment should be used as a basis to decide on the extent of the involvement of surveyors of the Society. Guidance note: A generic version of Quality Survey Plan QSP issued by the Society can be used as a model to develop an appropriate Quality Survey Plan for specific classification projects that should be submitted to the Society for approval before commencing activities in the project.
Programs applied where reliable results have been demonstrated to the satisfaction of the Society are regarded as recognised programs. Generally valid approvals for computer programs are, however, not given by the Society. This date and the construction numbers i. However, vessels within a series may have design alterations from the original design provided: a such alterations do not affect matters related to classification, or b if the alterations are subject to classification requirements, these alterations are to comply with the classification requirements in effect on the date on which the alterations are contracted between the prospective owner and the shipbuilder or, in the absence of the alteration contract, comply with the classification requirements in effect on the date on which the alterations are submitted to the Society for approval.
The optional vessels will be considered part of the same series of vessels if the option is exercised not later than 1 year after the contract to build the series was signed.
Necessary documentation, such as copies of approved plans, reports and other particulars approved by the flag administration shall be submitted. In case of class being assigned on the basis of flag administration requirements according to [3. The purpose of the DocReq is to provide a basis to verify that selected, safety critical parts of the requirements of the applicable DNV rules and standards are complied with in the design of the vessel.
A satisfactory document review is a prerequisite for assignment of DNV class and issue of statutory certificates. The document review shall be complemented by a review of the customer's quality system and by surveys by the Society.
The results of the examination will be stated in a letter of approval. Comments, conditions and limitations may be stated on the plans returned or in an accompanying letter. The scope of survey will be decided as specified in [1. The survey at the customer's premises may consist of a combination of visual inspections, tests, measurements and review of records. Guidance note: If second hand equipment complies with applicable rules for the newbuilding, it may upon special consideration be installed on newbuildings, provided the owner has given a written acceptance.
The extent of participation shall be limited to ensuring compliance with the requirement of Classification Rules and applicable statutory requirements. The programme shall specify systems and components to be tested, and the testing procedure. When testing control and safety systems, failure modes shall be simulated as realistically as possible.
The Society reserves the right to accept or decline an application for class entry. For a vessel classed with another IACS member society, the submitted information may be reduced to plans showing the main scantlings and arrangements of the actual hull and machinery installations.
The scope of survey will in each separate case be decided by the Society. The flag administration may decide that an extended scope of surveys has to be carried out.
Provided the conditions for retention of class are fulfilled and unless the class has been withdrawn in writing at an earlier stage, the class certificate will be valid for 5 years.
The vessel may be subject to a condition survey before entering into service. The extent and scope of survey will depend on the time period laid up and conservation measures taken. Provided the hull and machinery is found in all respects free from deterioration, subsequent periodical surveys will date from the time of the condition survey. In addition to the class notations, appropriate data related to identification, flag, ownership and other particulars will also be entered.
For vessels built under the supervision of the Society, the due date for the periodical surveys will be calculated from this date. For vessels built under the supervision of another classification society, the due date for the periodical surveys will depend upon the existing periodical survey schedule defined by the previous classification society.
Installed diving systems are subject to special provisions as given in Pt. These provisions include transferable diving systems installed temporarily. The owner has, together with managers, charterers and operators, a joint and several liability for any such fees and expenses. If a request for services is made by any other party than the owner, that party will, in addition to the owner, be responsible for the payment of the relevant fees — notify the Society when the vessel is laid up or otherwise taken out of service for a period of more than 3 months.
The vessel shall be surveyed in the first port of call or according to instructions from the Society. The survey shall be of an extent considered necessary by the attending surveyor for ascertaining the extent of the damage. The maintenance system shall ensure that: — — — — inspections and maintenance are carried out at defined intervals any defect is reported with its possible cause, if known appropriate correction or repair action is taken records of these activities are maintained.
The Society may increase the extent of a survey when deemed necessary in order to ascertain the condition of the vessel. Guidance note: When the Society has been authorised to carry out a statutory survey, a Condition on behalf of the flag Administration CA will be imposed for specific measures, repairs or surveys that should be carried out within a specific time limit in order to retain the statutory certificate.
Alternatively the CC may refer to a survey report for above details. An approved repair method may be recommended as part of the required action. Otherwise a time limit will be given for the action to be completed. A MO may supplement information given otherwise, e. They will be given in writing at completion of surveys. Findings may also be communicated verbally during the course of surveys.
Findings that have been corrected before the survey has been completed will not be recorded as CC. The owner will be notified accordingly. Survey and certificate status reports, on paper, may be distributed upon request. Possible design modifications or reduced scantlings based on current rules which are less stringent than those originally enforced, shall be approved by the Society before the repairs are carried out.
A surveyor shall be called for acceptance of such repairs when completed. If current rules are less stringent than those originally in force, then the current rules may be applied.
Guidance note: Alterations to the hull structure, machinery, systems and equipment made possible by amendments of the applicable rules may be undertaken provided the general safety and reliability level required for retention of class will be maintained. Guidance note: For the consideration, the following is typically to be considered: — escape ways shall not been blocked — the fire and gas system covers the temporary equipment, the equipment is covered by the ESD logic — the equipment's load is within deck load limits — the definition of hazardous areas takes into account the temp.
The class certificate will not be endorsed unless the following has been dealt with and accepted by the Society: — — — — overdue periodical class surveys overdue continuous survey items overdue Conditions of Class overdue Retroactive Requirement. In such cases the certificate will be endorsed for advancement of anniversary date due date for the subsequent annual surveys. Guidance note: Expiry date of the class certificate may remain unchanged, but additional surveys may be required so that the prescribed survey intervals are not exceeded.
However, in cases of automatic suspension, see [4. Suspension or withdrawal of class may take effect immediately or after a specified period of time. In special cases, the suspension or withdrawal of class may be made with retroactive effect see [4.
In the cases of class suspension, a time limit will be given for when the class will be withdrawn. The Society may after consideration accept that minor deficiencies are pending to be carried out. The class withdrawal may be made retroactive. This also applies when the obligation to pay rests with a yard or with the vessel's previous owners. In special cases a shorter notice may be given. The extent of survey will in such instances be decided by the Society. The previous customer shall give the Society immediate notice, in writing, of such transfers.
Obligations according to the rules shall remain with the previous customer until the Society is in receipt of such notice, in writing. See [1. The objective of certification shall ensure that materials, components and systems used in vessels to be classed by the Society comply with the rule requirements. Certification normally includes both plan approval and survey during production of the final product see [2.
Further, quality control shall be carried out by qualified personnel at facilities and with equipment suitable for that control. Covers only agreed components. The applicable chapters and sections of the rules specify which of the above mentioned documents are required. Compliance with the requirements of the standard shall be documented as required by that standard.
Such agreement may be part of a manufacturing survey arrangement see [2. Type approval can be applied to: — — — — products groups of products systems retention survey. This procedure should normally be used for approval of standard designs.
The type approval procedure used by the Society is described in Standard for Certification No. A type approval certificate will be issued by the Society when compliance with the design requirements is confirmed. The type approval certificate has a validity of 2 or 4 years depending on type of material, component or system for which the certificate is issued.
For these products and systems no survey is required, i. In such cases only the arrangement or system plans, interface plans and those plans mentioned on the type approval certificate shall be submitted for approval. Compliance with the approved design documentation and applicable requirements will be documented by certificates as required in the applicable chapters of the rules. The extent and frequency of periodical assessments of the manufacturer will be included in the MSA.
When the MSA is based on a certified quality system, the MSA automatically becomes invalid if the quality system certificate no longer is valid. Suspension or withdrawal of a certificate may take effect immediately or after a specified period of time. In special cases, the withdrawal of a certificate may be made with retroactive effect. In the cases of suspension, a time limit will be given for when the certificate will be withdrawn.
However, the compensation shall not exceed an amount equal to ten times the fee charged for the service in question. The maximum compensation shall never exceed USD 2 million. Further, said person undertakes to pay to the Society any sums awarded against the Flag Administration in respect of claims, losses, damages, costs, expenses and liabilities, and shall save, indemnify, defend and hold harmless the Society in every respect, if a claim is brought against the Flag Administration in breach of this obligation.
The Society is not responsible for the consequences arising from the possible un-authorised use of the Rules by others. Units complying with these requirements will be assigned a main character of class 1A1 followed by a description of the basic design concept of the unit, e. Further description of activity procedures are given in Ch. DNV may accept alternative solutions found to represent an overall safety level equivalent to that stated in the requirements of this document or the referred standards.
Additional elements relevant for specific service are listed in the subsequent sections. Temporary conditions are not included unless specifically specified.
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