DNV_2.7-2

CERTIFICATION NOTES No. 2.7-2 OFFSHORE SERVICE CONTAINERS DECEMBER 1995 DET NORSKE VERITAS CLASSIFICATION AS Veritasveien 1, N-1322 Høvik, Norway Tel.: +47 67 57 99 00 Fax: +47 67 57 99 11 FOREWORD DET NORSKE VERITAS (DNV) is an autonomous and independent Foundation with the object of safeguarding life, property and the environment at sea and ashore. DET NORSKE VERITAS CLASSIFICATION AS (DNVC), a fully owned subsidiary Society of the Foundation, undertakes classification and certification and ensures the quality of ships, mobile offshore units, fixed offshore structures, facilities and systems, and carries out research in connection with these functions. The Society operates a world-wide network of survey stations and is authorised by more than 120 national administrations to carry out surveys and, in most cases, issue certificates on their behalf. Certification Notes Certification Notes are publications which contain principles, acceptance criteria and practical information related to the Society's consideration of objects, personnel, organizations, services andoperations, in connection with issuance of certificates or declarations, which are not necessarily related to classification. An updated list of Certification Notes is available on request. The list is also given in the latest edition of the Introduction- booklets to the ”Rules for Classification of Ships”, the ”Rules for Classification of Mobile Offshore Units” and the ”Rules for Classification of High Speed and Light Craft”. In “Rules for Classification of Fixed Offshore Installations”, only those Certification Notes which are relevant for this type of structure have been listed. © Det Norske Veritas 1995 Data processed and typeset by Division Ship and Offshore, Det Norske Veritas Classification AS Printed in Norway by Det Norske Veritas 05/08/2003 10:44 AM CER02072.DOC 12.95.2000 Error! AutoText entry not defined. CONTENTS 1. General .............................................................................4 1.1 Objective..........................................................................4 1.2 Definitions .......................................................................4 1.3 Reference Regulations.....................................................6 2. Certification .....................................................................6 2.1 General ............................................................................6 2.2 Certification Procedures, new containers ........................7 2.3 Certification of existing containers..................................9 2.4 Alternative certification ...................................................9 2.5 Validity of certificates .....................................................9 3. Structural requirements................................................10 3.1 Requirements related to offshore transport and handling10 3.2 Additional fittings for lifting .........................................10 3.3 Requirements related to loads on containers during service ............................................................................10 4. Electrical equipment......................................................10 4.1 Scope .............................................................................10 4.2 General requirements.....................................................10 4.3 Arrangement of electrical equipment ............................11 4.4 Design of electrical systems ..........................................12 4.5 Requirements for electrical equipment exposed to hazardous atmospheres ..................................................12 4.6 Installation, repair and maintenance of Ex equipment...13 4.7 Earthing .........................................................................14 4.8 Cables ............................................................................15 4.9 Lighting system .............................................................15 4.10 Emergency shut down and electrical isolation ............16 4.11 Hook up of electrical supplies and controls.................17 4.12 Miscellaneous equipment ............................................17 5. Gas detection system .....................................................18 5.1 General ..........................................................................18 5.2 Arrangement of system..................................................18 5.3 Function requirements................................................... 19 5.4 Containers for important services and conditions for inhibit of automatic shut down in case of detected gas. 19 6. Heating, Ventilation and Air Conditioning ................ 19 6.1 General.......................................................................... 19 6.2 Ventilation arrangement................................................ 19 6.3 Technical requirements related to fan powered ventilation and air heating ............................................. 20 6.4 Over pressure ventilation systems................................. 20 7. Public address and main alarm systems ..................... 22 7.1 General.......................................................................... 22 7.2 Installation in containers ............................................... 22 7.3 PABX system................................................................ 22 8. Fire Protection............................................................... 22 8.1 General.......................................................................... 22 8.2 Passive fire protection................................................... 22 8.3 Fire detection and alarm system.................................... 23 8.4 Active fire protection .................................................... 23 8.5 Escape routes ................................................................ 24 8.6 Application principles ................................................... 25 9. Noise and vibration ....................................................... 26 10. Marking and instructions........................................... 26 10.1 Marking....................................................................... 26 10.2 Instructions for hook-up/installation........................... 27 11. Certificates................................................................... 27 11.1 Certificates and test reports......................................... 27 12. ...................................................................................... 27 12. Appendix A Offshore Container Certificate............ 28 13. Appendix B Certificate for Offshore Service Container...................................................................... 30 DET NORSKE VERITAS 4 Certification Notes - No. 2.7-2 December 1995 Introduction This Certification Note has been issued in order to collect into one document, the main parts of the various requirements from different regulations, which users of offshore service containers have to work to. Offshore service containers are often designed to perform temporary services on installations/vessels and therefore may be moved among different offshore installations/units and into different national waters. This imposes a challenge to use technical solutions which comply with all regulations at the same time. The Certification Note has been based mainly on recognised practice for the offshore industry in the North Sea, and aims to cover applicable statutory regulations and classification societies' requirements. Since the activities in this area are based on internationally recognised standards, the Certification Note is considered a standard suitable for world wide use. With regard to the main principles of design, the document aims to be stand alone. However, with regard to detailed construction, the quoted reference documentation should be used (e.g. electrical installations). For electrical equipment in hazardous areas it should be noted that American and European installation codes of practice differ to various extents and therefore should not be mixed. This Certification Note has been directed towards the European practice. However, where equivalence can be demonstrated the American practices and equipment may be accepted. Reference is made to sec 2.4 Alternative certification. It has been recognised that individual interpretations of all the various regulations may sometimes lead to conflicting requirements. Some regulations may contain requirements of a general nature or certain requirements may have been practised in a special manner. This Certification Note is therefore trying to describe practical solutions which will provide the same level of safety as the referred regulations. 1. General 1.1 Objective The objective of this Certification Note is to cover items related to safety of personnel, reliability and performance of equipment. The requirements cover transportation and operational phases. In line with the referred regulations the safety aspect is considered to be the main objective. Reliability and performance are also considered to have influence on safety as a secondary effect. Offshore service containers are exposed to rough handling during transportation. One of the aims of the Certification Note is to ensure that the container, and its equipment are arranged and protected to avoid damage. Suitability for repeated use shall be ensured through the choice of materials and arrangement. The requirements are concentrated on the container’s main structure shell and its fixed systems for maintaining safety and comfort for personnel. Where a container has built- in additional systems or equipment to prepare the container for special tasks, this may be covered by the certification process, according to prior agreement. Examples of such systems may be generators, pumps and well logging equipment. Certification should then be based on a set of standards and regulations applicable for such equipment. This should be agreed in advance, before the certification procedure starts. Details of such agreements will be stated on the final 2.7-2 certificate. Certification by Det Norske Veritas provides a document which may be presented to users of the container in order to clarify its technical standard and safety performance. The certificate also defines conditions for transportation to, and installation on, an offshore installation/vessel. The Certification Note or parts thereof may otherwise be used as a reference standard for specification of containers and for other skid-types of equipment. 1.2 Definitions Client The person or company who has entered into an agreement with DNV about certification based on this Certification Note. Offshore container: Portable unit up to 25 tonnes for repeated use in transport of goods or equipment, handled in open seas, to, from or between fixed and/or floating installations and ships. Offshore service container: Offshore container built and equipped for a special service task, mainly for temporary installation. (Examples are, laboratories, workshops, stores, power plants, control stations.) Offshore freight container: Offshore container built for transport of goods. (See "Certification Note 2.7-1, Offshore Containers.) Installation/vessel: This is used as a short term and may be a fixed offshore installation, a mobile offshore unit or a ship on which the container may be located. DET NORSKE VERITAS Certification Notes - No. 2.7-2 5 December 1995 Prototype: An equipment item, considered to be representative for the product to be approved, used for prototype testing. The prototype may either be manufactured specially for type testing or selected at random from a production series. Classification rules Rules developed by the classification authority which are the basis of the classification certificate for the ship/offshore installation. Statutory regulations. Regulations imposed by governmental authorities in the actual country where the equipment is used. Recognised standards. Standards found acceptable by Det Norske Veritas. Examples are ISO, IEC, CEN, CENELEC. Reference Regulations, standards etc. Abbreviated term for the classification rules, the statutory regulations and the recognised standards which are basis for the Certification Note. Primary structure: Load carrying and supporting frames and load carrying panels. Side and roof panels (including corrugated panels) are normally not considered to be part of the primary structure. Secondary structure: Parts which are not load carrying (for instance doors, plates in sides and roof). Structural mass1, TS The mass in kilograms (kg) of structural components, including both primary and secondary structure. Equipment mass, TE The mass in kilograms (kg) of insulation and all permanently fitted or installed equipment, etc. Fitted out mass1, TF The mass in kilograms (kg) of the container ready for use, including both the structural mass and the equipment mass, i.e. TF = TS + TE Payload, P The maximum permissible mass in kilograms (kg) of cargo or loose equipment which may safely be transported by the container. 1 The term “tare mass”, T, as used for offshore freight containers, is not suitable for offshore service containers. The “tare mass” of a service container is fitted out mass, TF. Rating, R Maximum gross mass of the container and its cargo in kilograms (kg). The Rating consists of the mass of the structure, fitted equipment and the payload, i.e. R=TF + P Recognised test institution for Ex equipment. Private or governmental testing laboratories who have obtained an international status as independent and recognised testing institution for electrical equipment in explosive atmospheres. Ex certificate A certificate issued by a recognised test institution as proof that the equipment has been tested and conforms to a specified standard. Ex equipment Equipment having an Ex certificate Basic and safety systems Fixed installed systems and equipment for electrical power supply distribution, ventilation, heating, gas detection, fire protection and lighting. Utility systems and equipment. Fixed installed or portable systems and equipment for use by the operators to perform a service. Examples are equipment for well logging, tool machines, power engines, office equipment, various testing equipment, etc. Portable equipment Equipment not permanently installed and electrical equipment connected to power or control systems by the use of plugs or sockets. Non-combustible material Material which neither burns nor gives off flammable vapours in sufficient quantity for self-ignition when heated to approximately 750ºC, according to IMO Res.A.472 (XII) or an equivalent test procedure. Any other material is a "combustible material". Low flame spread surface material Material which will adequately restrict the spread of flames. Testing of low flame spread is to be based on IMO Res. A.653(16) or an equivalent test procedure. Primary deck covering Deck covering which will not readily ignite or give rise to toxic or explosive hazards at elevated temperatures. Testing is to be based on IMO Res. A.214 (VII) or an equivalent test procedure. Standard fire test DET NORSKE VERITAS 6 Certification Notes - No. 2.7-2 December 1995 Test in which specimens of the relevant bulkheads or decks are exposed in a test furnace to temperatures corresponding approximately to a standard time-temperature curve. Reference is made to IMO Res. A:517(13) - "Recommendation and Fire Test Procedures for "A", "B" and "F" Class Divisions". "A" and "B" class divisions Divisions formed by bulkheads and decks which comply with the requirements in DNV Rules for Classification of Mobile Offshore Units, part 4, chapter 6. Total flooding fire-extinguishing system A permanently fixed system designed for extinguishing in the complete volume of an enclosure. 1.3 Reference Regulations The Certification Note is based on the following regulations and standards. When the reference regulations are used direct as supplementary reference for the design, the latest issue at that time is to be used. 1.3.1 DNV Rules and Certification Notes − DNV Rules for Classification of Mobile Offshore Units − DNV Rules for Classification of Fixed Offshore Installations − DNV Rules for Classification of Ships, class notation 1A1 − DNV Rules for Certification of Lifting Appliances − DNV Certification Note No. 1.1, Certification Services - General Description − DNV Certification Note No. 2.7-1, Offshore Containers 1.3.2 Statutory regulations − IMO, "Code for the Construction and Equipment of Mobile Offshore Drilling Units" − IMO, "International Convention for the Safety of Life at Sea" − Norwegian Maritime Directorate, "Regulations for mobile offshore units" − IMO, MSC/Circular 613, "Guidelines for the approval of containers handled in open seas" − Electricitetsrådet, Denmark, "Stærkstrømsreglementet" − Norwegian Petroleum Directorate, "Regulations concerning lifting appliances and lifting gear in the petroleum activities" − Norwegian Petroleum Directorate, "Acts, regulations and provisions for the petroleum activity" − Norwegian water recourses and energy administration, "Regulation for Electrical Installations Maritime Installations" − Norwegian water recourses and energy administration, "Regulation for Electrical Installations in buildings, §808 applicable to production installations for the Norwegian Waters" It should be noted that some of the above regulations refer to other regulations, therefor the list is not to be considered complete. 1.3.3 Standards, specifications, publications and guidance. − pr EN 12079 Offshore Containers - Design, construction, testing, inspection and marking. − International Electrical Commission, "Relevant IEC publications" − EN 50081-2 and EN 50082-2 for testing of electromagnetic compatibility. − The Institution of Electrical Engineers, "Recommendations for the electrical and Electronic Equipment of Mobile and fixed Offshore Installations" − UK, Dep. of Energy and Health and Safety Executive "Guidance on Design, Construction and Certification" 2. Certification 2.1 General Det Norske Veritas may issue a “Certificate of Conformity” for containers. Certification consists of the following steps as applicable: − Design assessment − Prototype tests − Production inspection − Production testing − Inspection of the completed installation − Functional testing − Issuance of certificates − Plating and marking Certification of structure strength for the transportation etc. will be based on DNV Certification Note 2.7-1. For each container an Offshore Container Certificate and an Offshore Service Container Certificate will be issued. The Offshore Container Certificate may be used separately as an independent document. Separate work orders may also be agreed. 2.7-1 and 2.7-2 certification may be for different clients. It is generally recommended that contact between DNV and the client is established at an early phase in order to ensure an acceptable design from the beginning. Documentation is to be submitted to the applicable DNV station. Fees are to be agreed, and order confirmation established. The documentation will in turn be forwarded to an approval office where relevant. Preliminary documentation may be submitted in one copy. The final documentation for approval is to be submitted in three copies. The “Certificate for Offshore Se