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Exit ProgramMajor Components Component Controls Process Control System OperationSystem Function

Circulating Water System

This presentation is designed to provide you the information you need to

understand and operate the Circulating Water System. You should view

all slides and read and study the information presented.

The presentation slides are advanced by clicking on the

button.

You can also advance to a selected section by using the topic buttons..

Industrial Resources, Inc.

Big Cajun Power Plant

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Exit ProgramMajor Components Component Controls Process Control System OperationSystem Function

In this module we will:

Describe the function of the Circulating Water System.

Describe the flow paths and major components associated withthe Circulating Water System.

Describe the Circulating Water System process control loops and

associated methods of control.

Describe the steps required to prepare for and startup theCirculating Water System.

Describe the steps taken during normal operation of theCirculating Water System.

Describe the steps required to shut down the Circulating WaterSystem.

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Circulating Water System Function

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The Circulating Water System Condenses Low

Pressure Turbine Exhaust Steam.

Main Steam

Cold Reheat

Steam

Hot Reheat

Steam

LP Turbine

Exhaust

Condenser

CirculatingWater Inlet

Circulating

Water Outlet

Condensate PumpHotwell

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Cooling Tower

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Flow Path

Cooling

Tower

Basin

Circ Water Pump

Condenser

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Circulating Water System

Flow Path

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Cooling Tower

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Circulating Water System Data

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Review QuestionsWhat is the function of the Circulating Water System?

What process is used to realease the heat from the

Circulating water in the Cooling Tower?

How is the Circulating Water cooled as it flows

through the Cooling Tower?

Click to Review

Click to Review

Click to Review

When you are sure you can correctly answer these question

click the Button to continue

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Major Components

Circulating Water Pumps

Cooling Tower

Condenser

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Circulating Water Pumps

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Circulating Water Pumps

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Circulating Water Pumps Valves

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Circulating Water Pumps Data

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Condenser

Circ Water

InletCirc Water

OutletTube

Sheet

Tubes

Hotwell

Outlet

Waterbox

Inlet

Waterbox

Waterbox

Vent

LP HeaterExtractionPiping

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Condenser Waterbox Valves

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Condenser Data

Circ Water Inlet

Temperatures

Circ Water Inlet

Temperatures

DP Indication

Condenser

Backpressure

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Cooling Tower

Cells

Risers

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Cooling Tower

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Cooling Tower Fans

Risers

Bypass

Intake Screen

Cooling Tower Fans

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Cooling Tower Basin

Bypass

Makeup

Screen

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Cooling Tower Data

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Cooling Tower Fans Data

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Review Questions

Click to Review

What is the function of the

Circulating Water Pumps?

Which Circulating Water System Valve,

when open, allows a single Circulating

Water Pump to supply both condenser

sides?

What component mounted in the

channel between the stop gate and the

intake structure prevents debris from

entering the pump suction?

When you are sure you can correctly answer these question

click the Button to continue

Click to Review

Click to Review

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Component Controls

Circulating Water Pump Controls

Cooling Tower Bypass Valve Controls

Cooling Tower Fans Automatic Controls

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Circulating Water Pump

Suction Valve Controls

A

BA

B

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Circulating Water Pump

Discharge Valve Controls

A

B

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Pump Cooling Water Supply

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Circulating Water Pump

Start/Stop Controls

Start/Stop

Soft Keys

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Pump Permits and

Process Trips

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Pump Lockout/Tagout

Lockout

Tagout

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Circulating Water Pump

Discharge Valve Controls

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Cooling Tower Controls

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Cooling Tower

Bypass Valve Control

Bypass Valve

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Cooling Tower

Bypass Valve Control

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Cooling Tower Fan Controls

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Fan Remote Start/Stop Controls

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De-icing Control

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Review Questions

How is each Circulating Water Pump

motor operated suction valve typically

controlled?

How is each Circulating Water Pumpmotor operated discharge valve typically

controlled?

How is De-icing of the Cooling Tower

performed?

Click to Review

Click to Review

Click to Review

When you are sure you can correctly answer these question

click the Button to continue

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Process Control

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Cooling Tower

Makeup Valve Control

Make

up

Valve

Basin Level

Level Controller

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Cooling Tower Basin Level

Controller

A in the grey background

indicates that the level

setpoint is not in automatic.

L in a white background

indicates that the operator

has local control over the

Basin Level setpoint.

Brown arrows indicate

basin level upper and lower

limits.

Level Setpoint

Measured Flow

Valve Output

percent

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Auto/Manual Control

A in the grey background

indicates that the level

setpoint is not in automatic.

L in a white background

indicates that the operator

has local control over the

Basin Level setpoint.

Brown arrows indicate

upper and lower Basin

Level limits.

Level Setpoint

Measured Flow

Valve Output

percent

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Basin Level Setpoint

A in the grey background

indicates that the level

setpoint is not in automatic.

L in a white background

indicates that the operator

has local control over the

Basin Level setpoint.

Brown arrows indicate

upper and lower valve

output limits.

Level Setpoint

Measured Flow

Valve Output

percent

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Review QuestionsHow is the Cooling Tower Makeup Valveactuated and controlled?

What does the Cooling Tower Makeup

Valve Controller Output Control?

Where does the Cooling Tower Basin Level

setpoint come from?

When you are sure you can correctly answer these question

click the Button to continue

Click to Review

Click to Review

Click to Review

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Circulating Water System

Operation Startup Prerequisites

System Startup Normal Operation

System Shutdown

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Startup Prerequisites

CIRCULATING WATER SYSTEM

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CIRCULATING WATER SYSTEM

STARTUP

Ensure Basin Level is established and

maintained

Ensure Circulating Water Pumps areready for Startup

Ensure system valves are properly aligned

Ensure support systems are available forservice.

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Prepare the Cooling Tower

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Establish Basin Level

Make

up

Valve

Basin Level

Level Controller

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Circulating Water Pump

Rack in pump andvalve breakers

OPEN each pumpssuction valve

Verify motor bearingoil levels are ok.

Valve in instrument

air and cooling water. CLOSE the circulating

water cross-tie Circulating Water Pumps

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Cooling Tower Fans

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Align System Valves

Suction

Valves

Waterbox

Inlet

Valves

Waterbox

Outlet

Valves

Discharge Cross-tie

Valve

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Open the Cooling Tower Bypass

START the A circ lating ater

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START the A circulating water

pump

M

A

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Check Pump Data

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A

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Close the Cooling Tower Bypass

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Start Cooling Tower Fans

At 50 Percent Load prepare for

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At 50 Percent Load, prepare for

and start the 2ndCirc Water Pump

A

M

M

M

Cross-tie

Valve

B

M

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Re-open the Discharge Cross-tie

A

M

M

M

B

M

MCross-tie Valve

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NORMAL OPERATION

Monitor Circulating Water System

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Monitor Circulating Water System

process variables from DCS displays.

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Check Cooling Tower Fans

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De-ice Cooling Tower If Required

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Circulating Water Pumps

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SHUT DOWN

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Shut Down One Circ. Pump

M

M

M

M

A

Cross-tie

Valve

B

M

Select the Cooling Tower Fan

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Select the Cooling Tower Fan

Stop Auto Sequence

OPEN the

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OPEN the

Cooling Tower Bypass Valve

STOP the Operating Circulating

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STOP the Operating Circulating

Water Pump

M

M

M

M

M

A

Cross-tie

Valve

B

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Exit ProgramMajor Components Component Controls Process Control System OperationSystem Function

Review QuestionsDuring preparation for Circulating Water

System Startup, what are the four majorsteps involved?

What position must the Circ. Water

Discharge Cross-tie valve be in prior to

starting the 2ndCirculating Water Pump?

During Normal Operation, how is ice removed

from the Cooling Tower?

When you are sure you can correctly answer these question

click the Button to continue

Click to Review

Click to Review

Click to Review

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Cooling Tower

Return to

Review Questions

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Cooling Tower

Return to

Review Questions

C

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Circulating Water Pumps

Return to

Review Questions

Ci l i W P V l

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Circulating Water Pumps Valves

Return to

Review Questions

C li T B i

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Cooling Tower Basin

Bypass

Makeup

ScreenReturn to

Review Questions

Circulating Water Pump

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Circulating Water Pump

Suction Valve Controls

A

BA

B

Return to

Review Questions

Circulating Water Pump

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Circulating Water Pump

Discharge Valve Controls

A

B

Return to

Review Questions

D i i C t l

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De-icing Control

Return to

Review Questions

Cooling Tower

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Cooling Tower

Makeup Valve Control

Make

up

Valve

Basin Level

Level Controller

Return to

Review Questions

Cooling Tower

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Cooling Tower

Makeup Valve Control

Make

up

Valve

Basin Level

Level Controller

Return to

Review Questions

B i L l S t i t

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Basin Level Setpoint

A in the grey background

indicates that the level

setpoint is not in automatic.

L in a white background

indicates that the operator

has local control over the

Basin Level setpoint.

Brown arrows indicate

upper and lower valve

output limits.

Level Setpoint

Measured Flow

Valve Output

percent

Return to

Review Questions

CIRCULATING WATER SYSTEM

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CIRCULATING WATER SYSTEM

STARTUP

Ensure Basin Level is established and

maintained

Ensure Circulating Water Pumps areready for Startup

Ensure system valves are properly aligned

Ensure support systems are available forservice.

Return to

Review Questions

Ci l ti W t P

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Circulating Water Pump

Rack in pump andvalve breakers

OPEN each pumpssuction valve

Verify motor bearingoil levels are ok.

Valve in instrumentair and cooling water.

CLOSE the circulatingwater cross-tie Circulating Water Pumps

Return to

Review Questions

D i C li T If R i d

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De-ice Cooling Tower If Required