This booklet has since the main revision October been amended, most recently in October DNV undertakes classification, certification, and other verification and consultancy services relating to quality of ships, offshore units and installations, and onshore industries worldwide, and carries out research in relation to these functions. Provide principles and procedures of DNV classification, certification, verification and con- sultancy services. Provide technical provisions and acceptance criteria for general use by the offshore industry as well as the technical basis for DNV offshore services. Provide proven technology and sound engineering practice as well as guidance for the higher level Offshore Service Specifications and Offshore Standards. Comments may be sent by e-mail to rules dnv.
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DNV-Rules for Classifi DNV rules for classifi DNV Rules 2. DynamicPositioning DNV Rules for certificatio Floating LNG Productio Design concepts for LN DNV undertakes classification, certification, and other verification and consultancy services relating to quality of ships, offshore units and installations, and onshore industries worldwide, and carries out research in relation to these functions.
Provide principles and procedures of DNV classification, certification, verification and consultancy services.
Provide technical provisions and acceptance criteria for general use by the offshore industry as well as the technical basis for DNV offshore services. Provide proven technology and sound engineering practice as well as guidance for the higher level Offshore Service Specifications and Offshore Standards. The changes are incorporated in the Web, CD and printable pdf versions. The amendments are shown in red colour in the Web and CD versions.
All changes affecting DNV Offshore Codes that have not been reprinted, are published separately in the current Amendments and Corrections, issued as a printable pdf file. Comments may be sent by e-mail to rules dnv. Det Norske Veritas. All rights reserved. No part of this publication may be reproduced or transmitted in any form or by any means, including photocopying and recording, without the prior written consent of Det Norske Veritas.
If any person suffers loss or damage which is proved to have been caused by any negligent act or omission of Det Norske Veritas, then Det Norske Veritas shall pay compensation to such person for his proved direct loss or damage. 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.
Structural Design Marine and Machinery or Utility Systems and Equipment.. Informative References Fire Protection Liquefied Gas Storage Instrumentation and Automation Safety Principles and Arrangement Marine and Machinery or Utility Systems Hydrocarbon Production Plant including Liquefaction Plant A Special Considerations for Conversions Basic principles Cargo Systems and Equipment Class Notations Technical Guidance for Classification Additional Services DNV-OSS is thus stating the terms and procedures for assigning and maintaining classification, technical requirements for main class 1A1 and OI , including listing of the applicable technical references to be applied for classification.
References B Normative references The standards given in Table B1, Table B2 and Table B3 include provisions, which through reference in this text constitute provisions for this standard.
B Offshore service specifications and rules B Recommended practices and other references The recommended practices and other references given in Table B3 are referred to in this standard. Informative References C Other references The documents listed in Table C1 include acceptable methods for fulfilling the requirements in the standard and may be used as a source of supplementary information.
The requirements in this section are based on the unit or installation being a combined oil and gas producing unit or installation. Hence, there are requirements that are not applicable if the unit or installation is only producing gas. A Documentation requirements Production Installation specifies additional requirements for: — — — — arrangement area classification shutdown escape, evacuation and communication.
Materials of the process deck and drainage system, including coamings and piping, shall be suitable for the low temperatures. Process deck with drainage shall be designed to prevent spillage on tank deck. These requirements are also applicable for the offloading area where spills may be anticipated. Where offloading is performed with a shuttle tanker moored alongside, a water spray system for heating of the hull exposed to leakage shall be provided.
The need for heating of the hull at outlets from open deck drainage led over board shall be considered. In addition to typical hazards listed in DNV-OS-A Appendix C, A, special emphasis shall be made to hazards such as: — release of cryogenic liquids — offloading concepts and operation — spread of fire that may threaten tank integrity.
Solutions for quick disconnection of mooring lines between the shuttle tanker and the oil and gas producing and storage unit or installation, where these are moored alongside by conventional means, shall be found if the formal safety assessment assumes or recommends such actions as a means of reducing the consequences. Number, location and type of monitors shall be optimised with regard to fire-fighting efficiency — water jet covering the mooring area — water-based sprinkler system according to DNV-OSD Ch.
Automatic shutdown shall also include gas processing facilities. Strength of independent cargo tanks shall comply with the requirements in the Rules for Classification of Ships Pt.
Accelerations acting on tanks shall be determined by direct calculations based on location specific environmental data with a return period of years. Cargo tanks and supporting structure subject to reduced temperature due to the cargo shall comply with the requirements in the Rules for Classification of Ships Pt. A shall read: The hull shall be inspected for cold spots.
The following is supplemental to the requirements therein: B The alarm shall be so that the operator will have sufficient time to stop the flow without exceeding the maximum permissible filling level.
B The automatic shut off valve shall be operated as part of the shutdown logic for the emergency shutdown system or process shutdown system integrating the process systems.
The requirements in this section are based on the unit or installation being a combined oil and liquefied gas storage unit or installation. Hence, there are requirements that are not applicable if the unit or installation is only storing liquefied gas. Materials of the drainage system including coamings and piping shall be suitable for the low temperatures.
The requirements are also applicable for the offloading area where spills may be anticipated. The need for heating of the hull at outlets from open deck drainage led over board, shall be considered. Cargo tanks and supporting structure subject to reduced temperature due to the cargo, shall comply with the requirements in the Rules for Classification of Ships Pt.
A, and shall have no penetrations that are less than class A0 or equivalent in all respects, other than the cargo pump and compressor shaft glands and similar glanded penetrations, see also Table and Table Number, location and type of monitors shall be optimised with regard to fire-fighting efficiency — water-based sprinkler system according to F, covering the mooring chain and fairlead, if fitted — water-based sprinkler system for the bow loading connector room — water-based sprinkler system covering any other cargo valves and equipment with a leakage potential — fixed fire-extinguishing system in the submerged turret loading or submerged turret production compartment shall be according to the requirements in cargo compressor and pump rooms, F, or a water based sprinkler system according to F Marine and Machinery or Utility Systems and Equipment D General Service notations LNG Storage Unit and LPG Storage Unit and LNG Storage Installation and LPG Storage Installation specifies additional requirements for: — — — — — — — liquid cargo transfer and stripping liquid cargo storing, segregation and treatment venting, inerting, gas freeing and vapour emission control oil discharge control crude oil washing system ventilation in hazardous areas turret machinery.
Reference to Pt. B The automatic shut off valve shall be operated as part of the shutdown logic for the emergency shutdown or process shutdown system integrating the process systems.
A Technical reference documents Technical requirements are given by reference to selected: — — — — DNV offshore standards DNV recommended practices other DNV rules and standards internationally recognised codes and standards. A The boundaries are also defined by the: — shutdown valve at cargo outlet from liquefaction plant to cargo storage.
Adequate separation shall be obtained for cold gas and liquids from wet gas. Any reference to specific location of loading or unloading areas such as bow or stern shall be read as general requirements applicable to all areas of loading or offloading.
Where flanges are unavoidable, due consideration shall be given to the effects of thermal contraction and expansion. A General assumptions 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.
A Assumptions DNV assumes that the tanker being proposed for conversion: — holds a valid class certificate from a recognised classification society — has been assessed and considered suitable for the intended new duty and service life at a specified location.
A Main principles All new systems shall comply with the latest DNV rules or standards or recognised international standards. Modified systems will normally be accepted based on rules or standards applicable at the time of construction.
Alternative solutions will be considered based on sound engineering principles. The criteria and limitations for the unit or installation, systems or components will be stated in the "Appendix to the classification certificate".
Alternatively, if less strict values than above shall be applied, determine hydrodynamic wave loads and motions and accelerations for the relevant location and during transit.
C Hull condition It is envisaged that thickness measurements are available from the evaluation done by or on behalf of the owner in preparation for the conversion. This information together with the renewal survey carried out onboard will decide the extent of possible steel renewal to: — bring the hull back to the basic scantlings as applicable for a tanker, or alternatively — accept reduced scantlings for a specific location.
C Hull strength in benign environment A new set of still-water load conditions needs to be defined in order to account for the new function of the unit, including global and local loads mentioned above.
An existing tanker would comply with the main 1A1 class requirements, which imply that the hull girder longitudinal strength is based on the 20 years North Atlantic environmental loads probability level of exceedance.
Technical Guidance for Classification C General All new or modified structure, systems and components shall comply with the current class rules in force at the time of signing the classification contract. A Hs [m] 20 Direct circulations required 10 18 Benign environment threshold C Marine systems and equipment The marine system piping and equipment are categorised in three groups based on the scope of the conversion work: a Not subjected to any alteration, or any effect from the modification of the related systems These systems or equipment will be accepted based on requirements for renewal survey.
Modification to systems and components that are identified as safety critical shall be subject to approval. The modified system shall also undergo satisfactory pressure or function testing as required by the Rules for Classification of Ships, Pt. C Electrical and instrumentation Typical consequences of conversions will be increased power demand and hazardous zone alterations.
This requires incorporation of new elements to the existing systems, and obtaining unambiguous area classification with matching equipment requirements. Integration of instrumentation for marine applications with new process and offloading functions needs to be implemented based on a consistent approach. Class requirements are based IEC standards - series. In case of incorporating of US based equipment, the hazardous area definitions will need specific attention with particular focus on Div 1 and fulfilment of Zone 0 and 1 requirements.
DNV accept electrical equipment for hazardous areas provided type test certificates issued by a recognised test laboratory or institution support these. This also applies to US based UL or FM listed electrical equipment upon evaluation of premises for use and scope of testing. C Safety systems and arrangement Safety systems will be subject to approval irrespective of the class scope chosen.
The focus will mainly be on systems that have global impact on the safety of the vessel, and the effect from safety and control systems beyond the individual process skid or module.
Protection of equipment from operation of the plant should be considered, e.
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