20208E00

0 ISSUE STIN STIN DEC. 95

REV. DESCRIPTION PREP.D CHK.D APPR.D DATE

Il presente documento RISERVATO ed di propriet dell'AGIP. Esso non sar mostrato a Terzi n sar utilizzato per scopi diversi da quelli per i quali stato inviato.This document is CONFIDENTIAL and the sole property of AGIP It shall neither be shown to third parties nor used for purposes other than those for which it has been sent

COMPANY SPECIFICATION

ELECTRICAL POWER SYSTEM

20208.VAR.ELE.SDS

Rev. 0

December 1995

20208.VAR.ELE SDSRev. 0 December 95Sheet 2


FOREWORD

Rev. 0 Total number of pages 28December 1995Issue in conformity with EEC directivesThis specification replaces and supersedes the following specification:a) 06678. VAR.ELE.SPC : GENERAL SPECIFICATION - ELECTRICAL POWER

SYSTEM



CONTENTS

1. GENERAL

1.1. Scope1.2. Normative references1.2.1. European normative references1.2.2. Normative references of other organisations1.2.3. Laws and decrees

2. FUNCTIONAL CHARACTERISTICS

2.1. Definitions2.2. Symbols and abbreviations2.3. Graphic symbols, codes and identification tags2.4. Operating environment2.5. Measurement units2.6. Electric system design2.6.1. General criteria2.6.2. Classification of hazardous areas2.6.3. Classifications of loads2.6.4. Voltage levels2.6.5. Voltage drops2.6.6. State of neutral2.6.7. Short circuit currents2.6.8. Wires sizing2.6.9. Power factor correction2.7. Main electric system2.7.1. Supply by external power network2.7.2. Self generation2.7.3. Distribution2.8. Emergency electric system2.9. Safety electric system2.10. Protections system2.10.1 Protection against short circuits2.10.2. Protection against overloads2.10.3. Requirements for the use of the protections2.11. Measure and control system2.11.1. Measurements and signals2.11.2. Control system2.11.3. Motors starts interfacing2.12. Navigation aid system2.13. Machines and equipment2.13.1. Classes of insulation and over-temperatures2.13.2. Generators2.13.3. Electric power transformers2.13.4. Electric boards2.13.5. DC and AC continuity static groups2.13.6. Electric motors2.13.7. Storage batteries



2.14. Materials Selection2.14.1. Choice criteria2.14.2. Cables2.14.3. Motor control and Power sockets units2.14.4. Conduits2.14.5. Cable trays2.14.6. Fittings and accessories2.14.7. Lights for marine signals2.15. Installation criteria2.15.1. Electric cabins2.15.2. Wires2.15.3. Electric boards and local control systems2.15.4. Power sockets2.15.5. Navigation aid system equipment2.16. Boundary conditions, limits and exclusions2.16.1. Applicability2.17.2. Limits and exclusions2.17. Ergonomics2.17.1. Access2.18. Safety2.18.1. General requirements2.19. Requirements for Quality Management and Assurance



1. GENERAL

1.1. Scope

This Specification sets out the minimum requirements and general criteria for the design,construction and installation of the electric power generation and distribution systems inon-shore and off-shore hydrocarbons plants.The design shall be in compliance with the requirements of the documentation issued bythe Company and with the mentioned Laws and Normative references. In any case, goodtechniques shall be applied, especially as far as safety and accident prevention isconcerned.

1.2. Normative references

The normative references and publications which deal with the whole electric powersystem are listed here below. When applicable, reference shall be made to EN EuropeanNormative References and CENELEC harmonisation documents or, in their absence, toCEI/CEI UNEL normative references and IEC publications. In any case, the system shallcomply with the Laws and Regulations issued by the Authorities and Local Organisationsunder whose jurisdiction the plants shall be installed.

1.2.1. European Normative References

- CEI Normative references- CENELEC Normative references- IEC Recommendations

1.2.2. Normative references of other organisations

- IEE Recommendations- API Normative references

Reference shall be made also to the Normative references and Recommendations issuedby the Organisations listed here below, specifically for the fields they apply to:

- SOLAR Safety of Life at Sea

- IALA International Association of Lighthouse Authorities

- ICAO International Civil Aviation Organisation



1.2.3. Laws and decrees

- DPR 547 (27/04/1955) : Rules for work accident prevention

- DPR 128 (09/04/1959) : Rules for the policing of mines and quarries.

- Law 186 (01/03/1968) : Rules regarding the production of electrical and electronicmaterials, equipment, machinery, installations and plants.

- Law 791 (18/10/1977) : Implementation of 72/23/CEE directive concerning thesafety assurances for the electrical material to be usedwithin certain voltage limits.

- Law 46 (05/03/1990) : Plants safety rules.

- DPR 886 : Integration and compliance with mines and quarriespolicing standards included in the Decree DPR n. 128 inorder to regulate hydrocarbons prospection, researchand production activities in the territorial sea and on thecontinental platform.



2. FUNCTIONAL CHARACTERISTICS

2.1. Definitions

For definitions reference shall be made to the Normative references in paragraph 1.2.

2.2. Symbols and abbreviations

For symbols and abbreviations reference shall be made to the Normative references inparagraph 1.2.

2.3. Graphic symbols, codes and identification tags

For graphic symbols, codes and identification tags reference shall be made to theNormative references in paragraph 1.2 and the standards and procedures indicated in theProject Documentation.

2.4. Operating environment

The components of the electric power system shall be designed and manufacturedaccording to the environmental conditions of the place of installation specified in theProject Documentation.

2.5. Measurement units

The measurements units adopted shall comply with the International System (I. S.).Measures in inches are generally allowed for the diameters of conduits and fittings.

2.6. Electric system design

2.6.1. General criteria

The scheme for the electric power generation and distribution grid, the voltage levels, thesizing of the plant, the type and the characteristics of each component shall bedetermined by the technical and economic analysis of the following factors:

Loads entity and dislocations Possibility and quality of the external supply Reliability of supply depending on the importance of service Persons and plants safety Reduction of spaces and weights (particularly off-shore) Environmental conditions of the site Easiness of management and maintenance Possibility of future extensions Standardisation and availability of components



2.6.2. Classification of hazardous areas

The classification of hazardous areas for the possible presence of explosive mixturesshall be made in compliance with the Normative References and the Standards indicatedin the Data Sheet.All the necessary measures shall be taken in order to limit hazardous areas both in termsof number and in terms of extension, since such limitation can result in noticeablesavings in terms of weight and space especially on platforms.

2.6.3. Classification of loads

The quality, that is the reliability and availability, of the electrical supply to the varioususers, shall take into account the user classification indicated here below:

TYPE DESCRIPTION

Normal loads Loads for normal drilling and/or production activities

Essential loads Loads required for the production, drilling, maintenance ofwells and manning activities

Emergency loads

Loads required to maintain safety conditions (in case of powerloss from the main supplies or in case of external dangerousevents), to start the main supplies, to prevent damages to theequipment and the plant, to take generally care of therestoration of normal conditions. As an example, thepressurisation systems for environments open towardsclassified areas, the instrumentation air compressors, the fuelsystem, the lubrication and cooling systems of the machines,the supervision, control and shutdown systems, the startsystems for the main motors, the auxiliaries for the electricboards and the machines, part of the logistic loads for themanning and maintenance of the plants shall be generallyconsidered as emergency loads.

Vital loadsLoads necessary to survive and communicate, to bringimmediate aid or remedial actions and, if necessary, enablethe evacuation of people.



2.6.4. Voltage levels

2.6.4.1. Rated voltage levels and maximum voltage for the equipment

In TABLE 1 the values to be adopted which comply with IEC-38 publication are listed.

TABLE 1Voltage levels and maximum voltages for the equipment

RATED VOLTAGES FOR 50/60 HzSYSTEMS

(kV)

MAXIMUM VOLTAGESFOR EQUIPMENT

(kV)

0.380 - 0.440 0-5

3 - 3.3 3-6

10 - 11 12

--- - 15 17-5

20 - 22 24

30 - 33 36

45 - 47 52

66 - 69 72-5

110 - 115 123

132 - 138 145

150 - 161 170

220 - 230 245

275 - 287 300

330 - 345 362

380 - 400 420

--- - 500 525

700 - 750 765

Voltage levels to consider only in the cases indicated in IEC 38



2.6.4.2. Selection criteria for the voltage levels

Unless differently required in the Data Sheet, the levels of generation and supply voltagefor the various users shall be chosen according to the criteria indicated in TABLE 2.

TABLE 2Criteria of voltage selection

RATED VOLTAGE(kV) APPLICATION

50 Hz 60 Hz Generation0.380

610.5

0.4406 ### 6.6

13.8

Up to 3 MWFrom 3 to 20 MW

Above 20 MW50 Hz 60 Hz Supply and distribution0.100 0.100 Secondary TV0.220 0.110 ()MCC auxiliaries and boards0.220 0.256 Single-phase users0.380 0.440 Motors up to 150 kW

6 6 ### 6.6 Motors over 150 kW10.5 ### 11 13.8 Motors over 2 MW

DC. VOLTAGE (Vcc)(kV) APPLICATION

50 Hz 60 Hz Generation and supply0.110 Auxiliary circuits for controls and protections

0.6 - 0.69 DC. motors for drilling systems() Through insulation transformer

2.6.5. Voltage drops

Electric system components shall be chosen in such a way than maximum voltagevariations, in normal operating conditions, shall never exceed the following values:

Light circuits : + 3% Power circuits: + 5%

The maximum permissible voltage drop at the entry of asynchronous motors shall notexceed 15%.



2.6.6. State of neutral

Unless otherwise specified, the neutral state of generators and electric powertransformers shall be earthed as follows:

directly for voltages lower or equal to 1 kV ("TN" system according to IEC-364-3) through earth resistor for voltages higher than 1 kV ("IT" system according to

IEC-364-3)

Earth failure current shall be limited to about 1/4 of the machine rated current and,however, not lower than 2.2 times the maximum current capacity of the grid, taking intoaccount future improvements.

2.6.7. Short circuit currents

Unless otherwise specified, the calculation of the short circuit currents shall be doneaccording to the IEC 909 Normative Reference, for on-shore plants, and IEC 336 for off-shore plants.

At least the cases of fault for free short circuit between the three phases and fault of anearth phase shall be taken into account in order to do the calculations.The short circuit minimum current shall also be calculated in relation to the connections inorder to verify the intervention of the protections to save the connection itself.

2.6.8. Wires sizing

The sizing of wires in relation to currents shall satisfy the following conditions:

containing voltage drops within fixed values. containing temperatures within permissible limits depending on the type of cable both

at normal operation current and, by means of co-ordination with electrical protections,at overload and short circuit currents in the actual conditions of installation

correct intervention of protections depending on the minimum impedance of the fault

circuit

The sizing that depends on the overload currents shall generally apply only to:

motors supply supply to loads for which the diversity coefficient is assumed to be less than 1 circuits installed in explosion- or fire-hazardous sites circuits with insulated neutral (IT System), when there is no opening, not even

manual, for first earth fault



The sizing that depends on normal operation currents shall be generally done also takinginto account the following criteria:

The connection wires of each piece of equipment (e.g. generators, transformers,motors) shall be sized according to the equipment rated power

The supply wires of a joint multi-section bus bars system shall be sized for according

to the maximum power required in normal operating conditions with one of thesupplies being out of order

The supply wires of several loads shall be sized according to the maximum power

required in normal operating conditions, taking into account a contemporaneitycoefficient of the loads

Al other wires shall be sized according to the maximum power required in normal

operating conditions, that is the maximum value absorbed with a duration not shorterthan 8 hours when the system runs according to the design conditions

2.6.9. Power factor correction

The power factor (cos ###), in normal operating conditions, shall remain over:

0.85 in case of self-generation only

0.9 in case of connection to the network of the Body producing Electric Power(except for more stringent requirements by the Body itself)

Should it be necessary to correct the load to obtain the required cos ### the followingprocedures shall be followed:

in case of low voltage loads the power factor shall be corrected at the level of thePower Centre board, through the insertion for each half-bar of step modular re-phasing batteries.The number of steps and their modularity shall be preferably chosen among thefollowing solutions:

- 3 steps 1,1,2- 5 steps 1,2,2,2,2- 6 steps 1,2,4,4,4,4

in case of medium voltage loads, the power factor shall be corrected for each userand transformer, unless otherwise specified in the Data Sheet.



2.7. Main electric system

The main electric system shall be able to supply all the users in the plant.

Its sizing shall take into account:

electrical balance obtained by adding all the rated powers installed and with theapplication of the correct load and contemporaneity coefficients

presence of particular users such as large motors or otherwise critical users availability of spares and predisposition to future extensions.

The choice between the connection to an external power supply or the self-generation ofelectric power shall spring from a technical and economic feasibility study which draws acomparison between the two solutions.

In particular cases of the legislative scenario and of availability of low-cost energysupplies, not otherwise of use, the possibility of giving the surplus of the electrical powerproduced to external users shall be also taken into account.

2.7.1. External network

Only high or medium voltage connections are considered in this specification.

In principle HV connections shall be adopted in case of powers higher than 5 MW; MVconnections for powers higher than 50 kW.

These systems shall comply with all the requirement of the Supplying Body as far as theequipment, the protections, the measuring systems and the logistic requirements of thedelivery point are concerned.

HV substations and MV switchboards shall include separate sections for equipment ofdifferent voltage, for transformers and signal and control auxiliary systems.

2.7.2. Self-generation

The choice of the number of generators and their unitary power shall also take intoaccount the spare philosophy (2x100%, 4x33%) and, especially for off-shore plants, thespace and weight reduction and the location on the platform.

The utilization coefficient of single generators shall never exceed 0.9.

The minimum number of generators shall be three (2 running + 1 stand-by). The solutionwith two generators only (1+1) can be accepted in particular cases only.The generators shall be started by fuel engines for unitary powers up to 2 MW: turbinesshall be used for higher powers.



Both turbines and fuel engines shall be normally supplied with gas: in case the latter isnot always available as a product, units having the double gas/diesel oil supply systemshall be used.

Should the essential loads supply be required in case of failures of part of the generationsystem, an automatic loads disconnection system shall be considered in order to excludenon-essential electrical users. The loading of new users shall not generate negativedisturbances on the plant sections not involved in the failure.

Similarly, the necessary measures shall be taken to make future extensions easilyfeasible. Unless otherwise specified, the extensions shall be expected to be of 50%.

2.7.3. Distribution

Single or doubleradial networks shall be normally used for the electric distribution.

Secondary electric boards shall be double radial and equipped with an automaticswitchover device. Each single supply feeder, like the transformers, shall be sized for the120% of the total power absorbed by the downstream system.

The transformers for single radial systems shall be sized for the 120% of the powerabsorbed.

Except for particular cases, radial networks shall be utilised for the final supply to eachuser.

2.8. Emergency electric system

The emergency electric power generation system shall be able to supply all the classifiedemergency and vital loads.

It can comprise diesel motor generators or, in case of main self-production, also anexternal supply.

Normally, it shall start running automatically in case of failure of the main generator.

The emergency generator may be required to supply essential loads in case of plantswith external supply,In this case an adequate automatic loads disconnection system and a time sequence inthe re-acceleration of motors which must continue running shall be provided.

Logistically, the emergency generator shall be kept segregated from the main generator.

Also the distribution shall include boards and cable routes separated from those of themain distribution, if possible.



Such requirement is binding in case of off-shore plants which shall also comply with allthe legislative and normative requirements relevant to emergency electrical plants whichare normally stricter than those of on-shore plants.

2.9. Safety electrical system

The safety electric power generator shall include continuity static groups as specified inthe design and stationary storage batteriesIt shall be able to supply all loads classified as vital for a minimum time period as requiredby legislative, normative or project rules.

2.10. Protections system

The typology of protections to adopt shall be indicated in the Data Sheet and shalldepend both on the user (board, transformer, motor etc.) and on the type of service(normal, emergency or safety).

In particular, the possibility to select the protections intervention shall be guaranteed inorder to minimise inefficiency in case of fault.

2.10.1. Protections against short circuits

All circuits shall be protected against short circuits with the only possible exclusion ofcable ducts which connect power sources and equipment such as generators, storagebatteries, transformers and rectifiers with relevant boards, if limited in length andadequately protected from a mechanical point of view.

2.10.2. Protections against overloads

All cables shall be generally protected against overloads with the only exclusion of:

rotary machines excitation circuits lifting electromagnets supply circuits Transformers secondary circuits



2.10.3. Requirements for the use of the protections

Unless otherwise specified, at least the indications of TABLE 3 shall be followed.

TABLE 3Electrical protections: applications

GENERATIONPROTECTION

APPLICATIONF27 F 40 F 46 F 49

F 50F 51 V F 51

NF 59 F 64 F 64 S F 67 F 87

Medium VoltageGenerator Entry (1)

LV Generator Entry< 500 kVA (1)

LV Generator Entry> 500 kVA (1)

Emergency or reservegenerator entry (1)

DISTRIBUTIONPROTECTION

APPLICATIONF26 F 46 F 49 F 50

F 50F 51 F 51

N

F 51LR F 64 F 66 F 87 F 97 F 99

Start, supply forHV/MV transformers

Start, supply forMV/MV-MV/LV-LV/LVtransformers

(2)(3) (3) (3)

Transformerentry (4)

EarthingresistanceMV-LV secondaryboards start

MV motor start (5)

LV motor startfrom MCCLV motor startfrom PCNOTES: (1) Only for parallel running

(2) For dry transformers(3) For oil transformers(4) If necessary in common to several entries(5) Only for switch starts (replaced by fuse in case of contactor)

Protections required

The codes of the above mentioned functions comply with Normative ref. ANSI/IEEE.



2.11. Measurements and control system

2.11.1. Measures and signals

2.11.1.1. Local measures and signals

All the entries and half-bars of the electrical boards shall be provided with at least avoltmeter with selector for the measurement of voltage between lines and to neutral andwith amperometer.

Unless otherwise specified, electrical boards exits shall be provided with a single-phaseamperometer for balanced loads, or a three-phase one with selectors for unbalancedloads, except for those exits that supply auxiliary users of a power lower than 50 kW andmotor starts with a power lower than 7.5 kW.

Electric power contactors can be required for single plant units, for MV motor starts andfor emergency generators.

2.11.1.2. Remote measures and signals

Measures and signals to transmit shall be highlighted in the Project Documentation alongwith the procedures for the transmission and management of data.

2.11.2. Control system

Whether to centralise or not the control system of the entire electric plant, or of part of it,will be indicated in the Data Sheet.

Unless otherwise specified, the control system shall be centralised for the MV generationand distribution system, whilst it shall be local from front panel for LV distribution.

All electrical users shall also be provided with a local control and manoeuvre device:

local panels shall be equipped with entry disconnecting switch electric motors shall have a local control panel.

2.11.3. Motors starts interfacing

All main electric boards motors starts shall be set for the interface with the control andsupervision system for the production and/or treatment plant taking into account at leastthe following configuration:

contact for the remote STOP/RUN control (AC = STOP - DC = RUN) contact for shutdown due to process cause (AC = STOP) contact to supply the local control panel signal for the motors running state signal of impossibility to start (summary all causes)



2.12. Navigation aid system

The navigation aid system shall be provided for all off-shore fixed platforms and particularattention shall be paid to its design and construction in order to comply with Internationaland National Normative references as well as the requirements of the Marine Authoritiesof the Country of installation.

The system shall normally include luminous and acoustic signals integrated withidentification panels and a beacon radar, if required in the Data Sheet.

The capacity of the luminous and acoustic signals shall comply with the requirements ofthe Normative Reference and the specifications of the Data Sheet.

In any case, the reliability of the system shall have maximum reliability and any failureshall be immediately detected and signalled.

The power shall normally be supplied by the main system with plug batteries whichguarantee the minimum autonomy required in the Data Sheet.

2.13. Equipment and machines

For the supply of electrical equipment and machines, refer to the project specification andthe attached standard documentation.Unless otherwise specified, at least the requirements of the following paragraphs shall becomplied with.

2.13.1. Classes of insulation and over-temperatures

The requirements shown in TABLE 4 shall be complied with.

TABLE 4Electric machines: Classes of insulation and over-temperatures

MACHINES CLASS OFINSULATION

CLASS OFOVER-TEMPERATURE

Asynchronous motors andsynchronous machines up to 1,000 V higher than 1,000 V

FF

F (100 K)B (80 K)

Oil transformers A A (60 K)

Resin transformers: HV encapsulated coils LV impregnated coils

FF

B (80 K)F (100 K)

Air transformers H H (125 K)



2.13.2. Generators

Generators, sized for continuous running, shall supply the required power in order towithstand

a 50% overload for 2 minutes with a 3% maximum voltage drop a 10% overload for 1 hour without exceeding the project over-temperature values the start of the largest motor in the plant

For a 50% momentary application of the generator load, the voltage shall be recoveredwithin + 2% of the rated voltage in 0.4 sec.

The excitation system shall be brushless and sized to supply the rated voltage with 1.25times the rated current, also guaranteeing a short circuit current for the generator able toactivate the protections.The maximum voltage variation from loadless to full load shall not exceed 3%.The voltage regulator shall work manually/automatically with a regulating capacity rangeof + 5%.When choosing the generator, particular attention shall be paid to:

short circuit ratio transient and subtransient reactance time constancies

The degree of mechanical protection shall be:

IP 23 for indoor installations IP 54 for outdoor installations

2.13.3. Power transformers

HV/MV power transformers shall be normally of the oil insulation type and equipped witha motor-driven on load voltage converter that can be controlled locally/remotely.

MV/MV, MV/LV e LV/LV power transformers shall be normally of the type having resininsulation and Dyn 11 connection group. They shall be also equipped with loadless 5-stepvoltage converter with a + 2,5% ratio.

Connections on the LV side shall normally be made with cables.The bar ducts can be considered only for powers higher than 1,600 kVA.



2.13.4. Electric boards

2.13.4.1 General requirements

Generally the use of fuses is not allowed: any dispensation must be explicitly authorisedby the Company.

All plastic materials inside the board shall be self-extinguishing.

2.13.4.2 Medium voltage boards

Unless otherwise required in the project specification, MV boards shall be of metal cladtype, formed by a solid steel structure, suitable for fixing (on the floor) and with external 2mm thick plate pluggings, adequately reinforced or ribbed.For internal metallic plates, the thickness can be reduced to 1,5 mm.

The boards are set up so as to enable extensions on both sides.

The electrolytic copper bars system, main and shunted, shall be anchored so as towithstand electrical and mechanical stresses due to short circuit currents for a durationdefined in the normative references.

Fixed installation switches and contactors shall be provided with disconnectors and shallbe mechanically interlocked to prevent disconnectors to work when the circuits areclosed.

Furthermore, interlocks shall enable the access to normally live parts only when thecircuits are disconnected and earthed.

An earth protection bar (PE) with a 200 mm2 minimum section shall be installed along thebottom of all the boards. Each section shall be individually connected to the PE by acopper connection sized according to the supposed earth fault current, with a minimumsize of 16 mm2.

Power switches and contactors shall have the electrical and mechanical characteristicsdefined in the project specification.

Generally it shall be used:

air-break vacuum-packed hexafluoride switches for generators entries, MV secondaryboards outlets, transformers outlets, exits for motors > 600 kW if connected to pumpsand > 400 kW if connected with compressors, and transformers up to 630 kW.

Contactor starters shall be preferably equipped with overload discharges.



2.13.4.3 Low voltage boards

Low voltage power boards (up to 1,000 Vac and 1,200 Vdc) shall be distinguished into:

Power Centre (PC) Motor Control Centre (MCC) Auxiliary Services and Lighting Distribution boards Local distribution boards and/or relevant to individual machines/users (PP-PLP)

a) Power Centre

The Power Centre board shall be used for the distribution of electrical power tosecondary boards and for the supply of users included between 76 kW and 200 kW.It shall be of the type with metal envelope and individual sections for the equipment ofeach circuit.The switches shall be in removable execution whilst on load disconnectors andstarters shall be in fixed execution.

b) Motor Control Centre

The Motor Control Centre (MCC) shall be mainly aimed to supply the motors.It shall be of the type with metal envelope and individual sections for the equipment ofeach circuit.The switches shall be in removable execution whereas on load disconnectors andstarters shall be in fixed execution.

c) Auxiliary Services and Lighting Distribution boards

They are boards aimed at the distribution of electrical power and auxiliary uses,lighting and DC. boards.It shall be normally of the type with metal envelope, with sections and with equipmentin fixed execution.In respect of the reliability of continuous running, they shall be normally provided incase of supply from two separate power sources, with a device for automaticswitchover.

d) Local distribution boards

Such boards shall be used for the local distribution of light and power supply, or forthe supply of individual users.Their execution shall be in accordance with the requirements which depend on theplace of installation. The equipment shall be in fixed execution.



2.13.5. DC and AC continuity static groups

They shall be formed by:

DC boards for battery charge and supply of the control systems, auxiliary services ofpower generation and distribution

inverters for the supply of vital loads

The DC board shall comprise at least two rectifier branches, sized for fully loading thebattery and for supplying foreseen loads.In normal running conditions, one of the two branches shall be in hot stand-by.The board shall be rated so that for a + 10% entry voltage variation, the voltage of theload change of + 2% at the most.

2.13.6. Electrical motors

2.13.6.1 Asynchronous motors

Asynchronous motors are required for normal applications. They shall have an IP54degree of mechanical protection and safety execution in compliance with theClassification of hazardous areas indicated in TABLE 5.Cooling shall be through air-air self-ventilation with suction from the side opposite the onecoupling with the machine.

TABLE 5Electric motors and equipment: Construction typology/ Areas classification

ELECTRIC MOTORS

NON-CLASSIFIEDOUTDOOR

AREAS

CLASSIFIED AREASACCORDING TO

CEI or IEC NORMATIVE REFERENCESEQUIPMENT Degree of protection Execution

LV motors IP - 54 EEx-d-IIB-T3 EEx-d-IIB-T3EEx-e-IIB-T3

MV motors IP - 54 EEx-d-IIB-T3 EEx-d-IIB-T3EEx-e-IIB-T3Equipment andMaterials IP - 54

EEx-d-IIB-T3EEx-d/e-IIB-T3

NOTES. In an off-shore environment, outdoor equipment, even if in a non-classifiedarea, shall be as per C1Z2

2.13.6.2 Synchronous motors

They shall be used only for special applications and their use shall always be expresslyrequired in the Project Specification.



2.13.7. Storage batteries

Unless otherwise required in the Data Sheet, NiCd storage batteries shall be used. Theyshall have individual elements in a self-extinguishing plastic container.The batteries shall be provided with dry charge and electrolyte on the sideOther types of batteries shall be adopted in case of specific applications, both from atechnical point of view and from the point of view of installation.



2.14. Materials

2.14.1. Choice criteria

Lighting fixtures, power supply and light sockets, motors control units and all theassembly materials shall be chosen in conformity with TABLE 5.

2.14.2. Cables

The choice of cables in relation to the plant typology shall be defined in the Data Sheet.Unless otherwise indicated, see criteria reported in TABLES 6A and 6B for thecharacteristics of insulators.

TABLE 6ACharacteristics and use of cables

ON-SHORE PLANTS

APPLICATIONCABLE

NORMATIVEREFERENCES MATERIAL MATERIAL

CHARACTERISTICS CEI IEC INSULATING SHEATH

Outdoor systems (in the field)- Power transport- Controls and signals- Normal light distribution- Emergency light distribution

Indoor systems in boardrooms- Boards supply (power)- Controls and signals- Electric boards interconnection

Cathode protection systems:- Anode and structures connect.s

Not propagating fireNot propagating flames

Reduced emission of corrosivegasses

20 - 1120 - 1320 - 2220 - 35

811885

332 - 3332 - 1

G7quality

ethylene-propylene

rubber

RzqualityPVC

Civil buildings, electriccabins:- Power and Light distribution- Emergency light distribution



20 - 1120 - 1420 - 2220 - 35

811885

332 - 3332 - 1

R2qualityPVC

RzqualityPVC

Electric boards:- Cabling inside the boards


Low emission of corrosive gassesLow emission of opaque flu

gasses

20 - 1120 - 3820 - 2220 - 35

811885

332 - 3332 - 1

G9 qualityelastomeric

mix ---

Earth systems:- Equipment earthing



20 - 1120 - 2020 - 2220 - 35

811885

332 - 3332 - 1

R2qualityPVC

---



TABLE 6BCable use and characteristics

OFF-SHORE PLANTS

APPLICATIONCABLE

NORMATIVEREFERENCES MATERIAL MATERIAL

CHARACTERISTICS CEI IEC INSULATING SHEATH

Deck, process modules,outdoor living:- Power transport- Controls and signals- Normal light distribution

Indoor living plant:- Power distribution- Normal light distribution- Emergency light distribution


Low development of opaque flugasses

Low development of toxic gassesLow development of corrosive

gasses

20 - 1120 - 3820 - 2220 - 35

811885

332 - 3332 - 1

G10quality

reticulatedelastomeric

mix

M1 qualitythermoplastic

mix

Safeties:- Extern. emerg. light distribution- Marine navigation aid system- Aerial obstacles


Low development of opaque flugasses

Low development of toxic gassesLow development of corrosive

gassesFire resistant

20 - 1120 - 4520 - 36

811885

332 - 3332 - 1

331

G10

qualityreticulatedelastomeric

mix

M1 qualitythermoplastic

mix

Electric boards:- Cabling inside the boards


Low emission of corrosive gassesLow emission of opaque flu

gasses

20 - 1120 - 3820 - 2220 - 35

811885

332 - 3332 - 1

G9

qualityelastomeric

mix

---

Earth systems:- Equipment earthing


Low emission of corrosive gasses

20 - 1120 - 2020 - 2220 - 35

811885

332 - 3332 - 1

R2qualityPVC

---

2.14.3. Motor control and Power sockets units

The motor control and Power sockets units shall comply with the classification ofdangerous areas (see Table 5) and IP-55 degree of mechanical protection.Rotating switches and push buttons shall be suitable for continuous running and shallhave a AC-11 or DC-11 use category with the following rated current of usage:

AC: cos j = 0.4, 6A, 120/220 V DC: L/R 300 ms, 1A, 110/220 V

The Power sockets on the 380 V circuit shall be 63 A three-phase.



2.14.4. Conduits

Hot-dip galvanized cables shall be used for the protection of cables.

2.14.5. Cable trays

The trays shall be of the ladder type and they shall be provided with cover for outdoorinstallations.The criteria indicated in TABLE 7 shall be followed as far as the materials are concerned.

Particular requirements shall be provided for laying in particularly critical sites from theenvironmental point of view.

TABLE 7Cable trays: materials/installation

MATERIAL INSTALLATION

AISI 316 Off-shore outdoors

AISI 304 Off-shore outdoors in anaggressive marine climate

GALVANIZED STEELUNI 5744

Off-shore and on-shore indoorsOn-shore indoors in non-

aggressive climate

2.14.6. Fittings and accessories

The fittings and accessories shall be chosen in conformity with the classification ofhazardous areas and the environmental conditions.

2.14.7. Lights for marine signals

All lights shall be in AISI 316 stainless steel, explosion-proof execution, IP55 mechanicalprotection, assembled on an adequate hinged-base support.The lights shall have double filament and automatic switch between the blown filamentand the stand-by one.

2.15. Installation criteria

2.15.1. Electric cabins

They shall be installed in safe areas, that is outside classified areas, and as equidistantas possible in respect of the relevant plants.

The location of the equipment inside the cabins shall take into account:

access, passage and work spaces for operation and maintenance personnel emergency spaces and exits cable entries and exits



2.15.2. Wires

The criteria for the installation of electric wires shall comply with the requirements herebelow, unless otherwise specified.

2.15.2.1 Electric distribution

Electric wires of LV and MV distribution systems shall normally be placed onto traysusing also the same supports provided for pipe-racks.Furthermore, they shall be buried in case of non-paved areas, laid into undergroundpassages in case of paved areas and in heavy PVC pipes buried in concrete blocks incase of pedestrian crossings.

The wires which constitute a double radial system shall follow separate routes.

The laying depth shall be:

1 m for wires of higher voltage than 1000 V 0.8 m for lower voltage wires

2.15.2.2 Users supply

The routes shall normally follow the pipe racks and the laying procedures shall be thoseindicated in paragraph 2.4.10.2. a)

The wires sections which are overground shall be mechanically protected by means ofconduits or trays.

In any case, the accessories and the assembly procedures to be applied shall complywith the normative requirements relevant to the typology of the classified area.

2.15.3. Electric boards and local control systems

The field panels shall be placed in the proximity of the structures, as close as possible tothe load centres supplied and in positions which enable easy access.The motor control units shall be fixed onto a hot-dip galvanized steel support and placedin the proximity of the electric motor to be run.

2.15.4. Power sockets

A sufficient number of power sockets connected to specific circuits shall be provided foroperative and maintenance uses. Their position shall be as close as possible to the pointof possible use.

Different voltage levels shall be connected to separate circuits.

2.15.5. Navigation aid system equipment

Lights and foghorns shall be fixed at a height included between 6 and 30 m from theaverage sea level.



Unless otherwise specified, the main lights, with white light, shall be fixed in pairs ontotwo diametrically opposite corners of the platform.

The same applies to auxiliary lights, with red light, which will be placed on the cornersthat are free from the main lights.

In case of several platforms physically linked to one another by means of bridges orfootbridges, the signal equipment shall be installed considering the group of platforms asa single structure.

2.16. Boundary conditions, limits and exclusions

2.16.1. Applicability

This specification shall be considered as an integration for those aspects not specified inthe Project Documentation. The latter indicates limits of competencies, project data andthe specific choices that have been made.

2.16.2. Limits and exclusions

Any particular limits and exclusions shall be indicated in the Project Documents.

2.17. Ergonomics

2.17.1. Access

The access to the equipment during the various phases of assembly, maintenance,manoeuvre and operation shall be in compliance with the requirements of the Normativereferences and the relevant ergonomic requirements.

2.18. Safety

2.18.1. General requirements

The Supplier shall guarantee that all materials and components of the plant which isobject of specification shall be workmanlike products to comply with the safetyrequirements indicated in the Normative References.

2.19. Requirements for Quality Management and Assurance

Any additional requirements of quality management and/or quality assurance arecontained in the relevant management specification enclosed in the bid request.

20208E00

Documents

Transcript of 20208E00