Combined Cycle Power Plant Baseline Schedule

Executive Summary

This document presents a comprehensive baseline schedule for a Combined Cycle Power Plant (CCPP) project, covering all phases from initial development through engineering, procurement, construction, and testing to commercial operation. The schedule has been developed based on industry best practices and provides a detailed roadmap for project execution.

The baseline schedule encompasses a total project duration of 42 months (3.5 years) from Notice to Proceed (NTP) to Commercial Operation Date (COD). Each project phase has been broken down into detailed activities with durations, logical relationships, resource requirements, and deliverables.

This schedule serves as the foundation for project planning, monitoring, and control throughout the CCPP project lifecycle. It identifies critical path activities, key milestones, and potential risk areas, providing a robust framework for successful project execution.

Table of Contents

1. Introduction
2. Project Overview
3. Master Project Schedule
4. Engineering Phase Schedule
5. Procurement Phase Schedule
6. Construction Phase Schedule
7. Testing and Commissioning Schedule
8. Schedule Validation
9. Schedule Management Plan
10. Appendices

Introduction

Purpose and Scope

This baseline schedule document provides a comprehensive timeline for the planning, engineering, procurement, construction, and commissioning of a Combined Cycle Power Plant. It serves as the primary planning and control tool for project execution and will be used to:

• Establish the project timeline and key milestones
• Identify and manage the critical path
• Allocate resources effectively
• Monitor and control project progress
• Identify and mitigate schedule risks
• Communicate project status to stakeholders

Methodology

The schedule was developed using a bottom-up approach, with detailed schedules created for each project phase and then integrated into a master schedule. Industry benchmarks and best practices were incorporated to ensure realistic durations and logical relationships. The schedule was validated through a comprehensive review process to ensure completeness, logical consistency, and resource feasibility.

Schedule Structure

The schedule is structured according to the following Work Breakdown Structure (WBS):

1. Project Development
2. Engineering
   • Process Engineering
   • Mechanical Engineering
   • Civil/Structural Engineering
   • Electrical Engineering
   • Instrumentation and Control Engineering
   • Other Engineering Disciplines
3. Procurement
   • Major Equipment
   • Balance of Plant Equipment
   • Construction Subcontracts
4. Construction
   • Site Preparation
   • Civil Works
   • Mechanical Installation
   • Electrical Installation
   • Instrumentation Installation
5. Testing and Commissioning
   • Pre-commissioning
   • Commissioning
   • Performance Testing
   • Handover

Project Overview

Project Description

The Combined Cycle Power Plant consists of gas turbines, heat recovery steam generators (HRSGs), and a steam turbine to generate electricity efficiently by utilizing both gas and steam cycles. The plant includes all necessary balance of plant systems, electrical systems, control systems, and auxiliary facilities required for operation.

Key Project Parameters

Parameter	Value
Plant Capacity	Approximately 500-800 MW
Configuration	2x1 or 1x1 Combined Cycle
Major Components	Gas Turbines, HRSGs, Steam Turbine, Generators
Project Duration	42 months (NTP to COD)
Major Phases	Development, Engineering, Procurement, Construction, Commissioning

Project Organization

The project will be executed by an integrated team comprising:

• Owner's team
• Engineering, Procurement, and Construction (EPC) contractor
• Major equipment vendors
• Specialized subcontractors
• Commissioning specialists

Master Project Schedule

The master schedule integrates all project phases and provides an overall timeline from Notice to Proceed to Commercial Operation. It identifies key milestones, phase overlaps, and the critical path through the entire project.

Project Timeline Summary

Phase	Start (Month)	Finish (Month)	Duration (Months)	Overlap with Other Phases
Project Development	0	12	12	Engineering (2 months)
Engineering	10	26	16	Project Development (2 months), Procurement (10 months)
Procurement	16	36	20	Engineering (10 months), Construction (8 months)
Construction	28	38	10	Procurement (8 months), Testing & Commissioning (2 months)
Testing & Commissioning	36	42	6	Construction (2 months)

Key Project Milestones

Milestone ID	Description	Schedule Date (Month)
MS1	Project Sanction / Notice to Proceed	Month 0
MS2	Environmental Permits Secured	Month 9
MS3	Engineering Kickoff	Month 10
MS4	Process Design Basis Approved	Month 12
MS5	30% Engineering Complete	Month 16
MS6	Major Equipment Purchase Orders Placed	Month 20
MS7	60% Engineering Complete	Month 21
MS8	90% Engineering Complete	Month 24
MS9	Engineering IFC Package Complete	Month 26
MS10	Site Mobilization	Month 28
MS11	Major Foundations Complete	Month 32
MS12	Gas Turbine Delivery	Month 33
MS13	Steam Turbine Delivery	Month 34
MS14	HRSG Delivery Complete	Month 32
MS15	Gas Turbine Set on Foundation	Month 34
MS16	Steam Turbine Set on Foundation	Month 34
MS17	Mechanical Completion	Month 38
MS18	Commissioning Start	Month 36
MS19	First Fire of Gas Turbine	Month 38
MS20	Steam Turbine Synchronized to Grid	Month 39
MS21	Combined Cycle Integration Complete	Month 40
MS22	Performance Testing Complete	Month 41
MS23	Commercial Operation Date (COD)	Month 42

Critical Path

The critical path for the project runs through:

1. Environmental permitting
2. Gas turbine procurement
3. Gas turbine foundation construction
4. Gas turbine installation
5. Gas turbine commissioning
6. Combined cycle integration
7. Performance testing

Engineering Phase Schedule

The Engineering Phase spans from Month 10 to Month 26 (16 months) and includes all design activities from conceptual design through detailed engineering to issued-for-construction documentation.

Engineering Activities Summary

Activity Category	Start (Month)	Finish (Month)	Key Deliverables
Project Kickoff and Mobilization	10	11	Project Execution Plan, Engineering Management Plan
Process Design	11	14	Process Design Basis, Heat & Mass Balance, PFDs, P&IDs
Equipment Sizing and Specifications	13	15	Equipment Data Sheets, Specifications
Conceptual Design	14	16	Conceptual Drawings, 30% Design Package
Detailed Design - Civil/Structural	16	20	Foundation Drawings, Structural Steel Drawings
Detailed Design - Mechanical	16	21	Mechanical Drawings, Equipment Layouts
Detailed Design - Electrical	16	21	Electrical Drawings, Cable Schedules
Detailed Design - I&C	16	21	Instrument Index, Loop Diagrams, Control System Design
Design Reviews and Optimization	21	23	60% Design Package, Review Comments
Final Design and Documentation	23	26	90% Design Package, IFC Drawing Package

Engineering Milestones

Milestone ID	Description	Schedule Date (Month)
EM1	Project Kickoff Meeting	Month 10
EM2	Process Design Basis Approval	Month 12
EM3	30% Design Review Completion	Month 16
EM4	60% Design Review Completion	Month 21
EM5	90% Design Review Completion	Month 24
EM6	Issued for Construction (IFC) Package Release	Month 26

Procurement Phase Schedule

The Procurement Phase spans from Month 16 to Month 36 (20 months) and includes vendor selection, contract negotiation, manufacturing, factory testing, and delivery of all equipment and materials.

Procurement Activities Summary

Activity Category	Start (Month)	Finish (Month)	Key Deliverables
Procurement Strategy Development	16	17	Procurement Strategy Document
Vendor Prequalification	17	19	Approved Vendor List
Gas Turbine Procurement	17	33	Gas Turbine Delivery
Steam Turbine Procurement	18	34	Steam Turbine Delivery
HRSG Procurement	18	32	HRSG Delivery
Generator Procurement	19	32	Generator Delivery
Control System Procurement	20	32	Control System Delivery
Electrical Equipment Procurement	21	33	Electrical Equipment Delivery
Balance of Plant Equipment Procurement	22	34	BOP Equipment Delivery
Construction Subcontractor Selection	24	28	Signed Subcontracts

Long-Lead Items

Equipment	Procurement Duration (Months)	Manufacturing Duration (Months)	Delivery Date (Month)
Gas Turbine	16	13	Month 33
Steam Turbine	16	12	Month 34
HRSG	14	11	Month 32
Generator	13	10	Month 32
Main Transformer	12	9	Month 33
Control System	12	9	Month 32

Construction Phase Schedule

The Construction Phase spans from Month 28 to Month 38 (10 months) and includes all site activities from mobilization through civil works, mechanical and electrical installation, to mechanical completion.

Construction Activities Summary

Activity Category	Start (Month)	Finish (Month)	Key Deliverables
Construction Mobilization	28	29	Site Establishment
Site Preparation	29	31	Graded Site, Access Roads, Drainage
Foundations and Civil Works	30	34	Foundations, Buildings
Major Equipment Installation	33	35	Installed Major Equipment
Piping Installation	34	36	Installed Piping Systems
Electrical Installation	34	36	Installed Electrical Systems
Instrumentation Installation	35	37	Installed Instruments
Mechanical Completion	37	38	Mechanical Completion Documentation

Construction Milestones

Milestone ID	Description	Schedule Date (Month)
CM1	Construction Mobilization Complete	Month 29
CM2	Site Preparation Complete	Month 31
CM3	Major Foundations Complete	Month 32
CM4	Buildings Enclosed	Month 34
CM5	Gas Turbine Set on Foundation	Month 34
CM6	Steam Turbine Set on Foundation	Month 34
CM7	HRSG Erection Complete	Month 35
CM8	Main Piping Systems Complete	Month 36
CM9	Electrical Systems Complete	Month 36
CM10	Control Systems Complete	Month 37
CM11	Mechanical Completion of All Systems	Month 38

Testing and Commissioning Schedule

The Testing and Commissioning Phase spans from Month 36 to Month 42 (6 months) and includes all activities from pre-commissioning through commissioning, performance testing, to commercial operation.

Testing and Commissioning Activities Summary

Activity Category	Start (Month)	Finish (Month)	Key Deliverables
Commissioning Team Mobilization	36	37	Commissioning Plan, Procedures
Auxiliary Systems Pre-commissioning	37	38	Pre-commissioning Reports
Gas Turbine Commissioning	38	39	GT Commissioning Report
HRSG Commissioning	38	39	HRSG Commissioning Report
Steam Turbine Commissioning	39	40	ST Commissioning Report
Combined Cycle Integration	40	40	Integration Report
Reliability Testing	40	41	Reliability Run Reports
Performance Testing	41	41	Performance Test Reports
Handover and Commercial Operation	41	42	Commercial Operation Certificate

Testing and Commissioning Milestones

Milestone ID	Description	Schedule Date (Month)
TM1	Commissioning Team Mobilized	Month 37
TM2	Auxiliary Systems Pre-commissioning Complete	Month 38
TM3	Gas Turbine First Fire	Month 39
TM4	Steam Turbine Synchronized to Grid	Month 39
TM5	Combined Cycle Integration Complete	Month 40
TM6	72-Hour Reliability Run Complete	Month 41
TM7	Performance Testing Complete	Month 41
TM8	Commercial Operation Date	Month 42

Schedule Validation

A comprehensive validation of the baseline schedule has been performed to ensure completeness, logical consistency, and resource feasibility. The validation confirmed that:

• All project phases and components are adequately covered
• Logical relationships between activities are appropriate
• The critical path is valid and continuous
• Resource allocations are reasonable and achievable
• Contingencies are appropriate for identified risks

The schedule validation identified some areas for potential enhancement, which have been incorporated into the final baseline schedule:

1. Enhanced interface management between engineering and procurement
2. More detailed resource histograms for the construction phase
3. Refined contingency allocations based on risk assessment

Schedule Management Plan

Schedule Updates and Reporting

• Weekly progress updates during construction and commissioning
• Bi-weekly updates during engineering and procurement
• Monthly executive reporting throughout project
• Formal schedule revisions quarterly or upon major changes

Change Management Process

• All schedule changes must follow the formal change control process
• Impact analysis required for all schedule changes
• Approval levels based on magnitude of schedule impact:
  • < 1 week: Project Manager approval
  • 1-4 weeks: Project Director approval

  • 4 weeks: Executive Committee approval

Performance Measurement

• Earned Value Management (EVM) will be used to track schedule performance
• Schedule Performance Index (SPI) will be calculated monthly
• Variance thresholds:
  • SPI 0.95-1.05: Acceptable
  • SPI 0.90-0.95 or 1.05-1.10: Requires monitoring
  • SPI < 0.90 or > 1.10: Requires corrective action

Recovery Planning

• Recovery plans will be developed when:
  • Critical path activities are delayed by more than 5 working days
  • SPI falls below 0.90 for two consecutive reporting periods
  • Key milestones are forecasted to be delayed

Appendices

Detailed Phase Schedules

• Engineering Phase Detailed Schedule
• Procurement Phase Detailed Schedule
• Construction Phase Detailed Schedule
• Testing and Commissioning Detailed Schedule

Resource Histograms

• Engineering Resources
• Procurement Resources
• Construction Resources
• Commissioning Resources

Schedule Risk Analysis

• Risk Register
• Schedule Contingency Analysis
• Probabilistic Schedule Analysis

Reference Documents

• Industry Benchmarks
• Historical Project Data
• Scheduling Standards and Guidelines

This baseline schedule provides a comprehensive framework for the planning, execution, and control of the Combined Cycle Power Plant project. It will be maintained and updated throughout the project lifecycle to reflect actual progress and changes in project scope or conditions.