Petrochem Designs
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Service Overview

Detail Engineering / Residual Engineering (EPC Stage)

Detail engineering develops the approved FEED into the Issued-for-Construction (IFC) drawings, data sheets, requisitions and models used for procurement, fabrication and construction. Our multi-discipline team works to the contractor’s procedures, numbering system and software, and integrates vendor data as it arrives.

We also take over residual engineering during construction and commissioning — technical query resolution, field changes, redline incorporation and as-built documentation — releasing the core EPC team for new work.

  • IFC qualityFour-level checking on every deliverable.
  • 30/60/90% model reviewsClash-free design reviewed with construction.
  • Vendor data integratedDrawings and data sheets updated as data arrives.
  • Residual engineeringSite TQs, field changes and as-builts to handover.

Codes & standards

  • ASME B31.3 / B31.1
  • API 610 / 617
  • AISC 360 / IS 800
  • Eurocode 3
  • IEC 60079
  • ISA 5.1
  • NEMA SM23

Software & tools

  • AVEVA E3D / PDMS
  • SmartPlant 3D
  • AutoCAD Plant 3D
  • CAESAR II
  • STAAD.Pro
  • ETAP
  • SmartPlant Instrumentation
  • Navisworks
Multi-Discipline Delivery

One team, every discipline

How each engineering discipline contributes to Detail Engineering — coordinated through one lead engineer, one model and one document register.

  • 7Disciplines
  • 1Integrated model
  • 4-levelChecking
Discipline 1 of 7

Process

Keeps the process design current and supports vendor and site queries.

Key deliverables

  • IFC P&IDs
  • Line list and data sheets
  • Relief valve sizing
  • Operating manuals input
Discipline 2 of 7

Piping & Layout

Designs, models and issues all piping for construction.

Key deliverables

  • IFC piping GAs and isometrics
  • Stress analysis (CAESAR II)
  • Support design
  • Piping MTOs and BOQs
Discipline 3 of 7

Mechanical (Static & Rotating)

Completes equipment engineering and integrates vendor data.

Key deliverables

  • Purchase requisitions
  • Vendor drawing review
  • Equipment GAs and nozzle loads
  • Inspection and test plans
Discipline 4 of 7

Civil & Structural

Designs structures, foundations and buildings to IFC.

Key deliverables

  • Steel structure design and drawings
  • Foundation design
  • Buildings and shelters
  • Roads, drainage and paving
Discipline 5 of 7

Electrical

Designs the power, lighting and earthing systems.

Key deliverables

  • Power and lighting layouts
  • Cable schedules and routing
  • Earthing and lightning protection
  • Relay coordination
Discipline 6 of 7

Instrumentation & Control

Designs field instrumentation and control system interfaces.

Key deliverables

  • Instrument hook-ups and location plans
  • Loop diagrams
  • Cable schedules
  • DCS / SIS I/O lists
Discipline 7 of 7

HSE & Process Safety

Keeps safety studies closed out as detailed design evolves.

Key deliverables

  • HAZOP close-out
  • Fire and gas layouts
  • Safety equipment layouts
  • Hazardous area drawings
Piping & Layout

Model-based piping design

Piping is designed in the 3D model and progressed through formal 30%, 60% and 90% model reviews with the client and construction team.

  • Equipment layouts, plot plans and piping GA drawings
  • Isometrics, spool drawings and bills of materials extracted from the model
  • Pipe stress analysis in CAESAR II to ASME B31.3 / B31.1
  • Pipe support standards, special supports and nozzle load checks (API 610 / 617 / NEMA SM23)
  • Clash detection and review in Navisworks / model review tools
Civil, E&I

Structures, power & control

Civil, electrical and instrumentation design are developed in parallel and coordinated through the model and interface registers.

  • Steel structure and foundation design in STAAD.Pro to AISC / IS 800 / Eurocode
  • Electrical load flow, short circuit and cable sizing studies in ETAP
  • Cable schedules, lighting, earthing and lightning protection layouts
  • Instrument index, data sheets, loop and hook-up drawings (SmartPlant Instrumentation / SPI)
  • Control system I/O lists, cause & effect and interlock narratives
Residual Engineering

Site support to handover

Engineering support continues through construction, pre-commissioning and commissioning until the documentation handover is complete.

  • Site technical query (TQ / RFI) resolution with defined turnaround times
  • Field change notices and design change management
  • Vendor document review, comment and certification tracking
  • Redline incorporation and as-built drawings and models
  • Final documentation dossier and model handover to operations
FAQ

Frequently asked questions

Which software do you work in?

Commonly AVEVA E3D / PDMS, Hexagon SmartPlant 3D, AutoCAD Plant 3D, CAESAR II, STAAD.Pro, ETAP, SmartPlant Instrumentation and Navisworks. We adapt to the platform, catalogues and procedures of the EPC contractor.

How do you manage quality on IFC deliverables?

Every deliverable follows a documented checking process: originator self-check, independent discipline check, inter-discipline check and approval, with model audits before each milestone.

Can you integrate vendor data into the design?

Yes. Vendor drawings and data are reviewed, commented and incorporated into the model, layouts, loop drawings and data sheets as they are received.

Can you take over residual engineering from another contractor?

Yes. We review the existing deliverables and model status, agree a handover plan and continue with minimal disruption to site.

What is the typical turnaround for site queries?

Turnaround times are agreed with the project, typically 24–72 hours depending on the complexity of the query.

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  • Offices in USA & India
  • Codes & Standards Compliant