Electrical system in Hydrocarbon Facilities required strict regulations and codes due to toxic, flammable and hazardous gas present. In addition, there are facilities isolated and surrounded by sea i.e. offshore production platform, therefore further recommendation practices has been implemented. This short article defines Electrical Engineering activities within these facilities and outline major aspects to execute a Project by Electrical Team.
1. Electrical Engineering Fundamental Requirements
Electrical Engineering is a branch of Electrical and Electronic competence which deals mainly with power generation and distribution electric power to consumers in a Plants. In fact, electrical engineering designs the facilities, identification all consumers required electric power and their total demand, prepare the specifications and data sheets of all equipment and bulk materials, present installation and location of equipment in drawings for construction/fabrication.
Although there are several organizations manage standard (i.e. IEC or ANSI) in designing electrical system, it is wide agreed that Electrical Engineering and Design will ensure safety of personnel are most critical factor. In order to accomplish that need, proper design and selection of equipment with respect to barrier or enclosure of live part in both normal and faulty condition. In addition, electrical system is designed to highest degree of service continuity and to prevent loss of production which lead to financial loss finally.
Aside from above two most important consideration, Electrical facilities shall be designed, constructed and installed so that components of the facilities are accessible for maintenance and capable of being repaired, replaced and extended in future.
Read more: Electrical Standards
2. Organization Chart
Upon awarded Project, Electrical Department will review the scope of work to fully understand Project and propose a suitable team accordingly. Electrical team will consists of Lead Engineer, Senior Engineers, Engineers, Senior Designers, Designers and Draftsman. It is worth to note that engineering center may used other assigned title for Lead Engineer, one of example is Discipline Coordinator.
The Lead Electrical Engineer will be the focal point for all Electrical discipline activities including coordination with Client and other disciplines. The rest of the team shall provide support to the Lead Engineer in completing and integrating the activities as detailed scope of work.
A typical Project Organization Chart for Electrical scope of work is as below:
3. Electrical engineering deliverables
Electrical engineering deliverables is in line with scope of work, type of project (green field, brown field, onshore, offshore) and scale of project. Lead Engineer will study Project ITB and conclude list of drawings and documents necessarily to accomplish scope. In general, Electrical discipline deliverables is include as below:
- Electrical Basis of Design (BOD),
- Electrical Load List and Load Analysis,
- Electrical Power Balance,
- Electrical Consumer List,
- Main Equipment Sizing,
- Electrical Equipment List,
- Key Single Line Diagram,
- Electrical Equipment Room Layout,
- Single Line Diagrams for Switchgear and Control Gear,
- Single Line Diagrams for Distribution Boards,
- Single Line Diagrams for AC UPS Systems,
- Single Line Diagrams for DC UPS Systems,
- Power Generation and Distribution Philosophy,
- Black Start Philosophy,
- Adequacy Check Report (Brown Field)
- Load Flow Report,
- Short Circuit Report,
- Motor Starting Report,
- Protective Relay Co-ordination Report,
- Harmonic Report,
- Electromagnetic Compatibility Report,
- Reliability Assessment Report,
- Insulation Coordination Report,
- Arc Flash Report,
- Power Factor Report,
- AC / DC UPS Sizing,
- Cable Sizing Calculations,
- Illumination Calculation,
- Hazardous Area Classification,
- Lighting Layouts,
- Cable Routing Layout or Cable Power Layout,
- Cable Tray Layout,
- Earthing Layouts,
- Lightning Protection Layout,
- Fire Alarm System Layout
- Navigational Aids Layout,
- Multi Cable Transit (MCT) Layout,
- Cathodic Protection Layout,
- Electrical IO List,
- Cable Schedules,
- Cable Drum Schedules,
- Control Schematic Diagrams,
- Interconnection Wiring Diagrams,
- Electrical Installation Details (i.e. Power, Lighting, Earthing),
- Lighting Circuit Looping Diagrams,
- Lighting Panel Schedules,
- Trouble Shouting Diagrams,
- Bulk Material Take-Off,
- Specifications for Electrical Equipments such as HV & LV Switchgear and Controlgear, Power Transformers, Distribution Panels, Electric Motors, UPS, Electric Cables, Electrical Miscellaneous
- Technical Bid Evaluation for Electrical Equipments such as HV & LV Switchgear and Controlgear, Power Transformers, Distribution Panels, Electric Motors, UPS, Electric Cables, Electrical Miscellaneous.
Different engineering company may use alternative name of documents and approach for electrical scope of work. Above list of documents is for general purpose, actual deliverable may vary due to project phase (Conceptual, Basis Design or Detail Design) as well.
4. Coordination with other disciplines
During project execution, Electrical team with exchange comments and information with other disciplines in team. Comments will be issued and received by internal issue method. By this way, comments is recorded and maintained for periodic quality audit. If comments are reasonable and acceptable to disciplines, they are to be incorporated into the respective documents. Otherwise the comments are to be discussed and resolved between Lead Engineers and the originator of the comments.