4.47-MS for Electrical Installation Works

PROCUREMENT, FABRICATION AND INSTALLATION OF DIESEL STORAGE FACILITY IN ESCRAVOS

TERMINALMETHOD STATEMENT FOR

ELECTRICAL INSTALLATION WORKSDate: 19.07.2010 Rev. 01

METHOD STATEMENT

FOR

ELECTRICAL INSTALLATION WORKS

01 19.07.2010 Issued for Tender SU DUE TSA

Rev. Date Description Prepared Checked Approved




TABLE OF CONTENT

1.0 Introduction and Scope

2.0 Definitions

3.0 References

4.0 Responsibilities

5.0 Methodology

5.1 Installation of Equipment

5.2 Laying of Cables and Terminations

5.3 Installation of Earthing Systems

5.4 Testing




1.0 Introduction and Scope

This document presents the methodology to be adopted by B+G&S for the execution of all electrical installation works. The scope of works covered in this presentation includes installation and on-site inspection and testing of all electrical equipment and systems at onshore and swamp based industrial installations such as installation of electrical equipment, cable laying and earthing systems.

2.0 Definitions

CNL Chevron Nigeria Limited (Client)

B+G&S B+G&S Nigeria Limited (Contractor)

3.0 References

IEC 60050-845 International Electro-technical Vocabulary (IEV) - Chapter 845: Lighting

EN 1838 Lighting applications - Emergency lighting

EN 12464 Light and lighting - Lighting of Work Places - Part 1: Indoor lighting

prEN 12464 Light and lighting - Lighting of Work Places - Part 2: Outdoor Lighting

EN 12665 Light and lighting - Basic term and criteria for specifying lighting requirement

BS 7671 Requirements for Electrical Installations

4.0 Responsibilities

Project Manager shall ensure that all project information are provided for the project team in timely manner. He shall be responsible for interfacing with project team and client on all matters concerning the delivery of the project. He shall ensure that all materials needed for the job are ready.

Project Engineer shall ensure that all project documents are complete and clearly understood by the discipline team. He shall ensure that the E&I Engineer has complete data and information required to carry out the activity as required by client.

E&I Engineer shall directly coordinate, plan and implement the E&I project activity according to client’s requirements.




CAHSES Manager shall ensure that all personnel at site carry out their activities safely according to the HSE Plan.

QA/QC Manager shall ensure that all works are completed as required in project documents and that all forms are filled in and duly signed off by all parties involved.

5.0 Methodology

Hydrocarbon processing facilities are hazardous areas that require that the requirements for electrical/instrumentation installations in hazardous areas be followed. B+G&S shall ensure that all electrical equipment to be installed in the process facility are certified fit for the location.

The B+G&S E&I Engineer shall inspect all equipment transported to site to make sure that they are in good function before any installation works shall be carried out.

Prior to installation of electrical equipment, the B+G&S E&I Engineer shall inspect all equipment foundations, and prefabricated supports, stands and brackets to make sure they are suitable for the intended installation. Where necessary all amendments shall be completed before starting the electrical/instrumentation installation.

Electrical equipment where necessary shall be moved to the vicinity of the installation and properly positioned to avoid damage.

5.1 Installation of Equipment

All electrical equipment shall be installed in full accordance with the manufacturer’s instructions with regard to foundations and alignment, and based requirements specified on project drawings.

Electrical equipment shall be carefully aligned with the coupled equipment and adjusted for vertical height at least equal dimensions to the machine feet. With the holding down bolts fully tightened, the final alignment check shall show that:

The machine is horizontal along its axis.

The weight is distributed evenly over all feet so that the machine base or frame is not distorted.

The correct axial alignment has been achieved.

Before energizing the machine on initial start-up it shall ensured that any locking devices and supports provided for transport are removed and that any debris is cleared from around the installations.

5.2 Laying of Cables and Terminations

B+G&S representative shall verify actual site conditions to compare actual site conditions with project drawings.




Cables shall be run above ground or underground as indicated on the project drawings. Wherever possible, cables and wiring shall be installed in continuous unbroken lengths without joints except permitted by client representative.

Cables received in drums shall be inspected for damage. Handling shall be done carefully to avoid damage.

Lifting of cables in drums shall be done by crane and shall be positioned in close range to intended installation area.

For buried cables, trenching shall be carried out by manual means and according to the route specified in the project drawings. Depth of trench shall be as specified in drawings. In existing facilities, a cable or metal detector shall be used to scan the area for existing underground facility. After the scan a test dig shall be carried out along the route profile before substantially excavating to the depth required in the drawings. Excavation shall be performed with shovels having wooden handles and personnel doing excavation shall use rubber hand gloves to provide insulation.

Above ground cables shall be laid on cable trays. Cable trays shall be installed on welded or clamped supports along existing structures such as pipe racks etc.

After installing the cable trays (for above ground) or completing the excavation (for under ground), the cables are pulled from source (the starting point where the cable drum is supported in form of a reel) to the destination (equipment location where termination shall be done). As the cables are pulled, they unwind from the drum like a reel. Where required by project specifications, underground cables shall run in PVC pipes in trenches. Cables passing below roads shall run through PVC pipes.

After completing the cable pulling activity, termination at the equipment and source ends shall be carried out.

Cable identification, segregation and tagging shall be carried out as specified on project documents. Tagging materials and process shall comply with client’s requirements. Electrical cables and instrument cables shall not be laid together in the same trench.

After properly positioning the cables in trenches, initial backfilling with sand shall be done. Thereafter, cable protection tiles shall be laid on slightly backfilled trenches. Cable protection tiles shall be constructed to project specifications. Cable protection tiles shall carry the proper colour code where required by project specifications.

After placing the cable protection tiles, total backfilling with excavated materials shall be performed and the area along the route re-instated to the normal form.

Finally, cable route markers shall be placed as required by project specifications.




5.3 Installation of Earthing Systems

All metalwork of electrical equipment, other than parts which are normally live or current carrying, shall be connected visibly to the earthing system to ensure immediate operation of protective devices in the event of earth faults which might otherwise go undetected, cause fire or explosion hazard, or endanger life, due to installation metalwork being maintained at a dangerous potential relative to earth.

All structural steelworks within the site including and instrument stands, steel frames of buildings and steelworks supporting electrical and other equipment shall be bonded to the earth system.

All earthing conductors shall be as required by project documents. Main earthing conductors shall have the required cross section.

All joints and connections in the earthing system shall be carefully made to ensure that they are mechanically and electrically sound.

Earthing cables shall be protected as required by project specifications where they emerge from the ground as for cables.

Where connected to equipment, all earthing cables shall be terminated using the appropriate lug of the correct size.

Ground beds shall be installed where required by project documents. The number of earth electrodes shall be governed by the requirement that the total resistance to ground or each earthing point shall not be more than required by project specifications.

Each electrode shall terminate in a brick or concrete chamber, with a concrete cover as shown on project drawings.

5.4 Testing

Inspection and testing of the various items of electrical equipment such as junction boxes, transmitters, motors, cables etc shall be conducted so as to verify that each item of the installation is in accordance with the project specifications and Approved for Construction Drawings. The inspection and check forms shall be completed and signed off by all parties.

Functional/Energized Tests on the electrical equipment and installations shall also be carried out. Tests will be carried out in the presence of client’s representative. Results of all tests shall be documented and signed off by all parties.

Documents

4.47-MS for Electrical Installation Works