Project Lifecycle · Phase 2 of 6
Basic & Detail Engineering
Complete E&I design packages — every drawing, document and calculation your project needs to build from.
What we do here
Our scope in this phase
- Basic engineering: SLDs, electrical load lists, equipment specifications, layout drawings
- Detail engineering: cable schedules, routing drawings, loop diagrams, hook-up drawings, instrument index
- Protection philosophy and relay setting calculations
- Earthing and lightning protection design
- ATEX/hazardous area classification drawings
- Automation and control system functional design specifications (FDS)
- As-built documentation and document control
Why it matters
The impact of getting this right
Engineering quality is the single biggest lever on project cost and schedule. Incomplete drawings lead to rework in the field; poor specifications lead to wrong equipment; missing loops lead to commissioning delays. APARA produces complete, construction-ready engineering packages — with enough depth that a contractor can build from them without interpretation.
Typical activities
What this phase looks like day-to-day
Single-line diagrams
Primary and secondary electrical SLDs to IEC standards.
Load schedule
Full load list with diversity, demand and spare capacity.
Cable schedule & routing
Cable sizing, routing and tray layout.
Instrument index
Full instrument register with tag, type, range and location.
Loop drawings
Complete instrument loop diagrams for all signals.
Hook-up drawings
Installation detail for all field instruments.
FDS authoring
Functional design specification for PLC/DCS/SCADA systems.
Earthing design
Touch and step voltage calculations, earthing grid layout.
E-HAZOP
Electrical hazard and operability review to identify risks and define safeguards during design.
Related expertise