Construction Phase Schedule

Table of Contents

Overview

The Construction Phase is where the physical plant takes shape. This phase typically spans 18-24 months and involves multiple disciplines working in coordination. The schedule below provides a detailed breakdown of construction activities, milestones, and critical path items.

IDActivityDuration (weeks)PredecessorsResourcesDeliverables
C1Construction Mobilization4P79Construction Manager, Site TeamSite Establishment Report
C2Site Clearing and Grading6C1Civil SubcontractorGraded Site
C3Site Access Roads and Drainage8C2Civil SubcontractorAccess Roads, Drainage System
C4Temporary Facilities Installation6C2Construction TeamTemporary Facilities
C5Piling Works10C3Civil SubcontractorCompleted Piling
C6Underground Utilities Installation8C3Civil SubcontractorUnderground Utilities
C7Gas Turbine Foundation12C5, P80(GT)Civil SubcontractorGT Foundations
C8Steam Turbine Foundation10C5, P80(ST)Civil SubcontractorST Foundations
C9HRSG Foundation8C5, P80(HRSG)Civil SubcontractorHRSG Foundations
C10Main Transformer Foundations6C5Civil SubcontractorTransformer Foundations
C11Control Building Foundation6C5Civil SubcontractorControl Building Foundation
C12Balance of Plant Foundations14C5, C6Civil SubcontractorBOP Foundations
C13Control Building Construction16C11Building SubcontractorControl Building Structure
C14Turbine Building Construction20C7, C8Building SubcontractorTurbine Building Structure
C15Water Treatment Building Construction14C12Building SubcontractorWater Treatment Building
C16Warehouse and Workshop Construction12C12Building SubcontractorWarehouse and Workshop
C17Cooling Tower Construction16C12Cooling Tower SubcontractorCooling Tower Structure
C18Switchyard Construction16C10Electrical SubcontractorSwitchyard Structure
C19Gas Turbine Delivery and Setting6C14, P12Mechanical Subcontractor, VendorInstalled Gas Turbine
C20Steam Turbine Delivery and Setting6C14, P22Mechanical Subcontractor, VendorInstalled Steam Turbine
C21HRSG Delivery and Erection12C9, P32Mechanical Subcontractor, VendorErected HRSG
C22Generator Installation6C19, C20, P42Mechanical Subcontractor, VendorInstalled Generators
C23Main Transformer Installation4C10, P62Electrical SubcontractorInstalled Transformers
C24Fuel Gas System Installation10C12Mechanical SubcontractorFuel Gas System
C25Cooling Water System Installation12C17Mechanical SubcontractorCooling Water System
C26Water Treatment System Installation10C15, P72Mechanical SubcontractorWater Treatment System
C27Compressed Air System Installation8C16, P72Mechanical SubcontractorCompressed Air System
C28Fire Protection System Installation12C13, C14, C15, C16, P72Fire Protection SubcontractorFire Protection System
C29HVAC System Installation10C13, C14, C15, C16, P72HVAC SubcontractorHVAC System
C30Main Piping Installation20C21, C24, C25, C26, C27Piping SubcontractorMain Piping Systems
C31Auxiliary Piping Installation16C30Piping SubcontractorAuxiliary Piping Systems
C32Pipe Insulation12C30, C31Insulation SubcontractorInsulated Piping
C33Main Cable Tray and Conduit Installation14C13, C14, C15, C16, C18Electrical SubcontractorCable Trays and Conduits
C34Power Cable Installation12C33Electrical SubcontractorPower Cables
C35Control Cable Installation10C33Electrical SubcontractorControl Cables
C36Lighting System Installation8C33Electrical SubcontractorLighting System
C37Grounding System Installation6C6Electrical SubcontractorGrounding System
C38Cathodic Protection System Installation6C6Electrical SubcontractorCathodic Protection System
C39Instrument Installation12C30, C31, C33Instrumentation SubcontractorInstalled Instruments
C40Control System Installation14C13, C34, C35, P52Control System VendorInstalled Control System
C41Electrical Equipment Installation12C34, P62Electrical SubcontractorInstalled Electrical Equipment
C42Motor Control Center Installation8C34, P62Electrical SubcontractorInstalled MCCs
C43UPS and DC System Installation6C13, C34, P62Electrical SubcontractorInstalled UPS and DC Systems
C44Switchgear Installation8C13, C34, P62Electrical SubcontractorInstalled Switchgear
C45Gas Turbine Mechanical Completion8C19, C24, C30, C39Mechanical Subcontractor, VendorMechanically Complete GT
C46Steam Turbine Mechanical Completion8C20, C30, C39Mechanical Subcontractor, VendorMechanically Complete ST
C47HRSG Mechanical Completion6C21, C30, C39Mechanical Subcontractor, VendorMechanically Complete HRSG
C48Balance of Plant Mechanical Completion10C25, C26, C27, C28, C29, C31, C39Mechanical SubcontractorMechanically Complete BOP
C49Electrical System Completion8C34, C35, C36, C37, C38, C41, C42, C43, C44Electrical SubcontractorCompleted Electrical Systems
C50Control System Completion6C40, C49Control System VendorCompleted Control System
C51Instrument Loop Checks8C39, C49, C50Instrumentation SubcontractorCompleted Loop Checks
C52Motor Rotation Checks4C49Electrical SubcontractorCompleted Rotation Checks
C53Hydrostatic Testing6C30, C31Piping Subcontractor, QA/QC TeamHydrostatic Test Reports
C54Pipe Flushing and Cleaning8C53Piping SubcontractorPipe Cleaning Reports
C55Insulation Completion10C32, C54Insulation SubcontractorCompleted Insulation
C56Painting and Coating12C45, C46, C47, C48Painting SubcontractorCompleted Painting
C57Punch List Development4C55, C56Construction Manager, QA/QC TeamPunch List
C58Punch List Resolution8C57All SubcontractorsResolved Punch List Items
C59Construction Completion Documentation6C58Construction Manager, Document ControlConstruction Completion Dossier
C60Systems Turnover to Commissioning4C59Construction Manager, Commissioning ManagerSystem Turnover Packages
Milestone IDDescriptionSchedule Date (weeks from construction start)
CM1Construction Mobilization CompleteWeek 4
CM2Site Preparation CompleteWeek 14
CM3Major Foundations CompleteWeek 26
CM4Buildings EnclosedWeek 46
CM5Gas Turbine Set on FoundationWeek 52
CM6Steam Turbine Set on FoundationWeek 52
CM7HRSG Erection CompleteWeek 58
CM8Main Piping Systems CompleteWeek 78
CM9Electrical Systems CompleteWeek 86
CM10Control Systems CompleteWeek 92
CM11Mechanical Completion of All SystemsWeek 96
CM12Construction Substantial CompletionWeek 110
CM13Systems Turnover to Commissioning CompleteWeek 120

  1. Site Preparation and Civil Works

    • Site clearing and grading
    • Gas turbine and steam turbine foundations
    • Turbine building construction

  2. Major Equipment Installation

    • Gas turbine delivery and setting
    • Steam turbine delivery and setting
    • HRSG erection

  3. Piping Systems

    • Main piping installation
    • Hydrostatic testing
    • Pipe flushing and cleaning

  4. Electrical and Control Systems

    • Cable installation
    • Control system installation
    • Instrument loop checks

  5. Completion Activities

    • Mechanical completion
    • Punch list resolution
    • Systems turnover

  1. Safety Management

    • Daily toolbox meetings
    • Weekly safety inspections
    • Monthly safety audits
    • Safety training programs
    • Permit-to-work system implementation

  2. Quality Control Inspections

    • Foundation inspections
    • Structural steel inspections
    • Welding inspections
    • Electrical installation inspections
    • Instrument installation inspections

  3. Testing and Verification

    • Concrete strength testing
    • Welding non-destructive testing
    • Pressure testing of piping
    • Electrical continuity and insulation testing
    • Instrument calibration verification

  4. Documentation Control

    • As-built drawing development
    • Material certification verification
    • Test report documentation
    • Non-conformance reporting and resolution
    • Vendor documentation management

  1. Interface with Engineering

    • Design clarification requests
    • Field change requests
    • As-built documentation
    • Technical query resolution

  2. Interface with Procurement

    • Material receiving and inspection
    • Storage and preservation
    • Vendor technical support coordination
    • Material shortage resolution

  3. Interface with Commissioning

    • System turnover planning
    • Pre-commissioning activity coordination
    • Commissioning support
    • Punch list management

  4. Interface with Operations

    • Operator training during construction
    • Operations input on accessibility
    • Spare parts management
    • Operating manual development support

  1. Labor Resources

    • Civil workers: 100-150 at peak
    • Mechanical workers: 150-200 at peak
    • Electrical workers: 100-150 at peak
    • Instrumentation technicians: 50-75 at peak
    • Support staff: 30-50 throughout

  2. Major Construction Equipment

    • Tower cranes: 2-3
    • Mobile cranes: 4-6
    • Excavators and bulldozers: 6-8
    • Concrete batch plant: 1
    • Welding machines: 50-75
    • Scaffolding: Extensive throughout site

  3. Temporary Facilities

    • Construction offices
    • Material laydown areas
    • Fabrication shops
    • Worker facilities
    • Temporary power and utilities

This construction phase schedule provides a comprehensive framework for managing the physical build-out of a combined cycle power plant, ensuring all activities are properly sequenced, resourced, and controlled to achieve mechanical completion and readiness for commissioning.