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LOWER BAKER

UNIT 4

POWERHOUSE

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INTRODUCTIONS

DANNY ROBERTSFIELD ENGINEER

JASON MCLAUCHLINPROJECT ENGINEER

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PROJECT TEAM

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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

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Manage In-streamFlows of the Baker andSkagit Rivers

Restore FacilityGenerating CapacityLost in 1960s landslide

Maintain Water Supplyto Lower Baker AdultFish Trap

PROJECT GOALS

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Design-Build Delivery

Collaborative Team Approach

Focus on achieving PSEsperformance requirements

Phased Design and

Construction

PROJECT STRATEGY

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CONSTRUCTION

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PHASE I - EXCAVATION

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PHASE 1 EXCAVATION

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PHASE 1 EXCAVATION

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PHASE 1 EXCAVATION

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PHASE 1 EXCAVATION

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PHASE IITUNNELING

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PHASE II - TUNNELING

Surge Shaft Tie In

1000LF

Drill and shoot 12 dia steel lining

Full Penetration Welding

Carboline Coating

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PHASE II - TUNNELING

Unit 4 Tie-In

Bottom of 270

Surge Shaft

50LF in 22day

shutdown

Laser Scanned

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PHASE II - TUNNELING

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PHASE II - TUNNELING

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PHASE II - TUNNELING

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PHASE IIIPOWERHOUSE

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PHASE III - POWERHOUSE

Draft TubeElbow

Liner

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PHASE III - POWERHOUSE

Scrollcase andStay Vanes

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PHASE III - POWERHOUSE

Inlet Pipelowering

into

position forfit up to

Scroll Case

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PHASE III - POWERHOUSE

Fitting PitLiner onto

Scroll Case

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PHASE III - POWERHOUSE

Structural work builtconcurrently with

embedment of

turbine components

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PHASE III - POWERHOUSE

GeneratorFoundation Core

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PHASE III - POWERHOUSE

Removable Draft Tube Cone Tripping Runner/Turbine Shaft

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PHASE III - POWERHOUSE

Installing Wicket Gates Runner and Turbine Shaftlowered onto Bottom Ring

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PHASE III - POWERHOUSE

LoweringHead Cover

over the

TurbineShaft

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PHASE III - POWERHOUSE

LoweringBottom Ring

into

Powerhouse

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PHASE III - POWERHOUSE

LowerBearing

Bracket

and Statorprepped

for Rotor

install

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PHASE III - POWERHOUSE

Tipping the Rotor 90tons

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PHASE III - POWERHOUSE Shaft Coupling

Lower Bearing Assembly

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PHASE III - POWERHOUSE

Installingthe Slip Ring

Housing

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PHASE III - POWERHOUSE

Turbine Pit and Coolingwater piping systemsnearing completion

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PHASE III - POWERHOUSE

Gate Guides for theDraft Tube Gate

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PHASE III - POWERHOUSE

GSU andTransmission

Structures

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PHASE IVTAILRACE

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PHASE IV - TAILRACE

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PHASE IV - TAILRACE

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PHASE IV - TAILRACE

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FINISHED PRODUCT

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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 withOwner provided Unit

No interruptions to ongoing Unit 3 generation

SUCCESSFUL PROJECT

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LOWER BAKER

UNIT 4

POWERHOUSE

QUESTIONS?

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