Electrical Systems Electrical Systems Additional requirements to NORSOK standard NORSOK standard...
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Electrical Systems Additional requirements to NORSOK standard
NORSOK standard cross reference list:
E-001, Electrical Systems, Rev. 5
1 General 1.1 Purpose The purpose of this document is to ensure that technical requirements on the electrical system is clearly defined, followed up and carried out with the specified requirements.
1.2 Scope The document covers the companys additional requirements to the NORSOK standard E-001. And it also covers the companys requirements not related to NORSOK E-001. It is important to understand that NORSKO E-001 and companys additional requirements must be read as one document.
1.3 Target group and Responsibility The document owner is responsible for this document and for ensuring that it is updated or revoked when required by organizational or operational conditions.
1.4 Deviation management Deviations shall be handled in accordance with guideline 4920, "Handling nonconformities and gaps". All approved/rejected deviations shall be sent to the Technical Document Center for registering and filing.
1.5 Definitions/Abbreviations N/A
1.6 References Normative References
2 Technical requirements 2.1 General
2.1.1 Climatic conditions
The installation shall operate satisfactory under the following environmental conditions:
Maximum sea temperature: + 18°C
Minimum sea temperature: + 2°C
Maximum air temperature: + 25°C
Minimum air temperature: - 10°C
Maximum indoor temperature:+ 35°C
Maximum relative humidity: 100% (condensing in field)
Minimum relative humidity: 28%
Atmosphere: Salty and corrosive
Wind velocity: 25m/sec gusting to 45m/sec.
2.1.2 Hazardous atmospheres
All equipment to be in operation in unclassified area during situation of hazard and accident, except where located in CCR, LER, in emergency switch room, emergency generator room, battery charger and UPS room or living quarters, shall as a minimum be suitable for IEC zone 1 area, gas group IIA, temperature class T3 hazardous atmosphere. Note: Battery room installation shall be approved for gas group IIC, or “IIB + H2”.
2.1.3 Responsibility of area classification
When determining area classifications all proposals should be made to the Technical Safety Section before sign off by responsible person electrical systems.
2.1.4 Interface and replacement of existing equipment and systems
Interface to-, or replacement of, existing equipment and/or systems, should comply with the philosophy used on the platform involved (Platform standard). Anyhow, a case by case evaluation shall be done to evaluate use of NORSOK or old specifications. An evaluation shall be done in close co-operation with responsible discipline and shall be approved by responsible discipline.
Reference between drawings (existing platform drawings and new drawings) is mandatory. This is applicable for all drawings, also standard vendor package drawings. These requirements also apply between different types of drawings, ie. electrical, mechanical and instrument. If vendors standard drawings contain different symbols or signs than those used on companies facilities, a legend explaining symbols shall be used.
2.1.5 Use of annexes
The content of all annexes in this additional technical requirement are interpretation of roles and regulations and shall as such be considered normative. The drawings in the annexes give more detailed information than NORSOK and include valuable installation and design information. Anyhow the layout of the drawings shall be considered as guidelines only.
2.2 NORSOK E-001 Electrical systems The alpha/numeric headings in the following chapter reference the headings in NORSOK standard E-001.
The section numbering corresponds with the section numbering in NORSOK E-001. Only section numbers with relevant comments to NORSOK E-001 are included.
2.2.1 NORSOK E-001 chapter 2.1 Normative references
H-001 Heating, Ventilation & Air Conditioning (HVAC)
I-001 Field Instrumentation
FEA/FEA-M 1990 (for minor modifications on platforms designed before NORSOK)
3093Notification of Safety and Automation System Design & Modification
3599Arbeid på elektrisk utstyr
3800Prequalification of Personnel - Activities related to Electrical Installation
3801Notification of Electrical Installation
4621Material, Fabrication and Surface Treatment Requirements for ProcurementPackages
4672Heating, Ventilation & Air-Conditioning (HVAC)
5067Completion Manual for Projects and Modifications
6307Safety Shutdown Systems
6326Management of Technical Control Documents (TCD)
2.2.2 NORSOK E-001 chapter 3.2 Abbreviations
BESD Blue Emergency Shut Down
DBESDDrillers Blue Emergency Shut Down
DOL Direct On Line starting
LER Local Equipment Room
PSD Production Shut Down
RESD Red Emergency Shut Down
YESD Yellow Emergency Shut Down
2.2.3 NORSOK E-001 chapter 4.10 Location of electrical equipment in units
For areas for storage and preparation of food such as cooling rooms, freezer rooms, kitchens etc., the installation shall be designed for easy cleaning according to the Health Department regulations and satisfaction.
2.2.4 NORSOK E-001 chapter 5.1.3 Emergency source of power, (UPS)
The UPS system shall be supplied from alternatively Normal and Emergency supply. The changeover shall be according to Annex 2: Uninterruptible power supply system.
The UPS system shall be able to be started from battery supply only (Black start function) after a YESD situation. Bypass of the ESD trip signal to battery breaker shall be by key switch located in LER or CCR, a bypass alarm function shall be provided. Battery breakers closing can be local operated.
The Company shall be contacted regarding UPS system configuration.
Redundant UPS shall not contain common mode failure elements. This means that the system is laid out such that there is unrestricted access to one unit while the other is in service.
The battery system back-up time shall be according to NORSOK S-001 chapter 18 Emergency power and IMO 1989 MODU CODE chapter 5.
Ref to EN ISO 13702 table C.1 List of services.
Fire and gas detection and alarm systems 180 min
Emergency shutdown and depressuring (ESD/EDP) control systems 30 min
Process monitoring and control systems 45 min
Public access, platform audible alarms and status lights 180 min
SOLAS communications equipment 24 h
Emergency and escape lighting 90 min 1)
Navigational aids including helideck lights 96 h
The battery back-up time shall be approved by company in each case.
Emergency and Escape lighting is feed from emergency generator, the emergency generator function time is 18 hours. Battery backup time of 30 minutes is therefore sufficient.
There shall be starting sequence logic for the start-up of the FW pumps and emergency generator in accordance with NFPA 20.
1) For new batteries.
2.2.5 NORSOK E-001 chapter 5.1.7 Additional requirement for electrical emergency power system
Emergency generator prime mover shall be equipped with high cooling water temperature detection systems. Generators shall be equipped with vibration and cooling water leakage detection systems.
Emergency generators shall have self-contained control system independent of the SAS. The self-contained control system shall be supplied from independent batteries.
The trip signal from SAS shall have key switch bypass facilities with alarm to SAS.
2.2.6 NORSOK E-001 chapter 5.2.2 Neutral earthing for system up to and including 1000 V
Table 2 – System earthing methods to be used. 400/230V shall be TN-S.
Emergency Generator and distribution systems shall be IT system.
2.2.7 NORSOK E-001 chapter 5.3 Distribution systems
Distribution systems on existing platforms are not uniform. Differences are found in generated voltages and frequency, distribution voltages and system earthing. D.C.
system voltages also vary from platform to platform. Reference shall be made to Company for details of the system in use on a particular platform.
NOTE: All new platforms shall follow international standards ref. IEC 61892-2.
All electrical equipment shall be specified at the rated voltage and frequency of the system it is connected to. Equipment that does not have the correct ratings shall not be used. Manufacturers + or - variations of the equipment marked ratings cannot be allowed as a justification for use if the marked ratings do not match the system ratings e.g. 460 volts motors are not to be used on 480 volt systems, 230 volt lighting fittings are not to be used on 240 volt systems, equipment rated for 50 Hz cannot be used on 60 Hz systems. Exception to the above may be allowed by written confirmation from the manufacturer.
Multi Voltage equipment (e.g Motors) shall be equipped with rating plate and datasheets specifying current for the applied voltage. The Company shall be con