Construction of Baker Powerhouse #4

LOWER BAKER UNIT 4

POWERHOUSE

INTRODUCTIONS

DANNY ROBERTS FIELD ENGINEER

JASON MCLAUCHLIN PROJECT ENGINEER

PROJECT TEAM

• 32 MW Francis Turbine/Gen • 1000’ Steel Lined Power Tunnel • Subterranean Concrete Structure

and Tailrace: 7,949CY placed • Mechanical and Electrical Building

Systems • Integrated Facility Controls of

Units 3 and 4 • Upgraded Unit 3 controls and

Governor • Synchronous Bypass

THE PROJECT

• Manage In-stream Flows of the Baker and Skagit Rivers

• Restore Facility Generating Capacity Lost in 1960s landslide

• Maintain Water Supply to Lower Baker Adult Fish Trap

PROJECT GOALS

• Design-Build Delivery

• Collaborative Team Approach

• Focus on achieving PSE’s performance requirements

• Phased Design and Construction

PROJECT STRATEGY

CONSTRUCTION

PHASE I - EXCAVATION

PHASE 1 – EXCAVATION




PHASE II – TUNNELING

PHASE II - TUNNELING

• Surge Shaft Tie In

• 1000LF

• Drill and shoot

• 12’ dia steel lining

• Full Penetration Welding

• Carboline Coating


• Unit 4 Tie-In

• Bottom of 270’ Surge Shaft

• 50LF in 22day shutdown

• Laser Scanned




PHASE III – POWERHOUSE

PHASE III - POWERHOUSE

Draft Tube Elbow Liner


Scrollcase and Stay Vanes


Inlet Pipe lowering into position for fit up to Scroll Case


Fitting Pit Liner onto Scroll Case


• Structural work built concurrently with embedment of turbine components


Generator Foundation Core


• Removable Draft Tube Cone • Tripping Runner/Turbine Shaft


Installing Wicket Gates Runner and Turbine Shaft lowered onto Bottom Ring


Lowering Head Cover over the Turbine Shaft


Lowering Bottom Ring into Powerhouse


Lower Bearing Bracket and Stator prepped for Rotor install


• “Tipping” the Rotor

• 90tons

PHASE III - POWERHOUSE • Shaft Coupling

• Lower Bearing Assembly


• Installing the Slip Ring Housing

PHASE III - POWERHOUSE • Turbine Pit and Cooling

water piping systems nearing completion


• Gate Guides for the Draft Tube Gate


• GSU and Transmission Structures

PHASE IV – TAILRACE

PHASE IV - TAILRACE

PHASE IV - TAILRACE

PHASE IV - TAILRACE

FINISHED PRODUCT

• Tunneling Operation Extremely Accurate

• Achieved all Tolerances in Stacking Unit

• Digital Upgrade of Unit 3 Control Room and hydraulic system

• Commercially Operational 100 days ahead of schedule

• Successful Overall Design Coordination with Owner provided Unit

• No interruptions to ongoing Unit 3 generation

SUCCESSFUL PROJECT

LOWER BAKER UNIT 4

POWERHOUSE

QUESTIONS?

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Documents

Construction of Baker Powerhouse #4