Detailed Engineering Design (DED)

Detailed Engineering Design (DED) is where engineering moves from definition to execution. At Sherle, DED converts the approved Basic Engineering Package (BEP) into a fully coordinated set of Issued-For-Construction (IFC) documents required for fabrication, procurement, installation, and commissioning.

Our DED services support startups, SMEs, and established chemical companies across specialty chemicals, pharmaceuticals, petrochemicals, biofuels, polymers, and pilot plant projects. Every system is engineered with a strong focus on safety, operability, maintainability, constructability, and long-term reliability.

Our Services

What Is Detailed Engineering Design (DED)?

Detailed Engineering is the final engineering stage before construction begins. It answers the most important execution question:

“Exactly how will this plant be built, wired, installed, and operated?”

DED delivers fully defined, vendor-integrated, and code-compliant engineering documentation that eliminates ambiguity during fabrication and site execution. At Sherle, DED is developed as a direct continuation of BEP, ensuring design continuity, minimal rework, and smooth transition into procurement and construction.

Process Engineering

Process engineering during DED focuses on finalizing the process definition and ensuring it is fully executable. We prepare IFC P&IDs, finalize heat and mass balances, and issue final equipment datasheets. Detailed equipment sizing calculations, line sizing, and hydraulic analyses are completed to reflect real operating conditions. Relief systems are finalized in accordance with API 520/521 and DIERS, ensuring robust protection under all credible scenarios.

Scope of Sherle’s Detailed Engineering Services

Mechanical Engineering

Mechanical engineering ensures that all pressure-containing and rotating equipment is safe, code-compliant, and fabrication-ready. This includes final mechanical datasheets, pressure vessel, reactor, and column design in accordance with ASME Section VIII, heat exchanger mechanical design to TEMA and ASME, and storage tank design to API 650 / API 620. Equipment GA drawings, nozzle orientation drawings, skid base frames, and structural steel designs are developed along with detailed fabrication drawings and material specifications.

Piping Engineering

Piping engineering translates process intent into buildable piping systems. We develop piping material specifications, line lists, piping classes, and fabrication-ready isometric drawings. Where required, pipe stress and flexibility analyses are performed in accordance with ASME B31.3, and detailed pipe support designs are prepared. Final valve datasheets and specialty piping item specifications ensure seamless procurement and installation.

Electrical Engineering

Electrical engineering during DED focuses on precise power definition and safe distribution. Final electrical load lists with exact ratings are prepared, followed by IFC single-line diagrams, cable sizing and schedules, and detailed electrical equipment datasheets. MCCs, PLC panels, and control panels are fully detailed with GA drawings, while lighting layouts, earthing and grounding systems, and hazardous area classification drawings ensure compliance and site safety.

Instrumentation & Control Engineering

Instrumentation and control engineering defines how the plant will be monitored, controlled, and protected. Deliverables include the final instrument index, ISA-compliant instrument datasheets, I/O lists, control system architecture, and control valve sizing. Loop diagrams, instrument hook-up drawings, detailed control narratives, Cause & Effect matrices, interlocks, permissives, and shutdown logic are developed to ensure safe and stable plant operation under all conditions.

Civil & Structural Engineering

Civil and structural engineering supports safe equipment installation and long-term structural integrity. We design equipment foundations, RCC and structural steel elements, pipe racks, platforms, and access structures. Load calculations consider dead, live, wind, and seismic loads, along with lifting and transportation conditions required during erection.

DED Deliverables

At the conclusion of Detailed Engineering, clients receive a complete IFC documentation package. This includes IFC drawings across all disciplines, detailed design calculations, finalized datasheets and specifications, Material Take-Offs (MTOs), Bills of Quantities (BOQs), and integrated vendor documentation.

These deliverables allow fabrication, procurement, erection, and commissioning to proceed smoothly—without design ambiguity or late-stage surprises.

How DED Fits into the Project Lifecycle

Sherle delivers engineering up to the DED stage. During procurement, erection, and commissioning, we continue to provide technical support and engineering clarification through trusted fabrication, EPC, and commissioning partners—ensuring continuity from design to operation.