Limpieza de Catdos 03H07200-4-VEN-7813-13-R1 Trans1

CHEMET~CS

ANODICALLY PROTECTED

SULPHURIC ACID COOLERS

ISSUED TO:

PLANT:

I

PROJECT No.:

DATE:

I

DESCRIPTION:

SOUTHERN PERU

COPPER CORPORATION

110,

Peru

Sulphuric Acid Plant No.2

03H07200

I

04A-618

January 2005

Drying Acid Cooler

SIN 04-618

Absorber Acid Cooler

SIN 04-619

Product Acid Cooler

SIN 04-620

OPERATING & MAINTENANCE MANUAL

This manual is issued by Chemetics with the understanding that all information contained herein is of a confidential nature and is not to be circulated indiscrfminately. All drawings and specifications relating to the Chemetics' anodic protection system and all information contained in this manual are to be considered the property of Chemetics and are not to be used or reproduced without permission, except by the purchaser for his own internal use. Acceptance of this manual implies acceptance of the above conditions by the purchaser.

I

CHEMETICS

ACID COOLER OPERATING

&

MAINTENANCE MANUAL

ANOTROL

®

2000 SYSTEM

TABLE OF CONTENTS

·

,_{, Chapter 1 Introduction}

fI

~~~ Chapter 2 System Description Chapter 3 Anotrol® 2000 System Chapter 4 Operating Procedures Chapter 5 Routine Maintenance

i

Chapter 6 Performance Monitoring

Chapter 7 Special Installation and Maintenance Procedures Chapter 8 Troubleshooting

Appendix A Drawings

Add Cooler

CHEMETICS

I

CHAPTER 1

INTRODUCTION

• Purpose • Guarantees • Proprietary Rights

•

Anotrol" . .

I

I

Ii

Add Cooler

I

INTRODUCTION

PURPOSE

The purpose of this manual is to provide the end user of Chemetics Anodically Protected Sulphuric Acid Coolers with the information necessary to operate, maintain, and troubleshoot the cooler(s) and the associated Anotrol" 2000 Anodic Protection Equipment.

Plant Supervisory, Operating and Maintenance personnel involved with the day-to-day operation and maintenance of the cooler(s) should become completely familiar with the contents of this Manual in order to gain the maximum benefits.

GUARANTEES

The Performance Guarantee and Mechanical Warranty provided for the acid cooler(s) are conditional on the cooler(s) being operated and maintained in accordance with the specific instructions provided herein. Failure to comply with or observe the recommended procedures will cancel all guarantees.

I

PROPRIETARY RIGHTS

All information, including but not limited to, descriptions, procedures, drawings, and specifications relating to the design, operation, maintenance, or troubleshooting of the acid cooler(s) and associated equipment provided in the manual are the sole property of Chemetics and must not be reproduced or divulged to any third party without the express written consent of Chemetics.

ANOTROL®

The name Anotrol" used throughout this manual is a registered trademark of Rohrback Cosasco Systems Inc. The Anotrol" equipment supplied with the acid cooler(s) has been designed to Chemetics specifications and is marketed and serviced solely by Chemetics to the sulphuric acid industry.

Add Coo~er

CHEMETICS

CHAPTER 2

SYSTEM DESCRIPTION

• Acid Cooler

I

I

Acm Cooler

CHEMETICS

SYSTEM DESCRIPTION

The acid cooling system removes the excess heat generated from the drying, absorption, and gas cooling that takes place in the acid towers. Each acid plant has a unique process arrangement requiring that the acid coolers be designed to handle the specific heat duty generated within the plant.

ACID COOLER

The Chemetics acid cooler, which transfers the excess heat from the acid to the cooling water, is a stainless steel shell and tube heat exchanger with acid flowing through the shell space being cooled by water flowing through the tubes.

Located within the shell of the cooler are the baffle plates, which support the tubes and divert the acid around the tubes to promote heat transfer.

Acid Out

The Acid and Water Piping, which deliver acid and cooling medium to and from the cooler, are an integral part of the acid cooling system.

All metallic surfaces in contact with acid within the cooler, i.e. the tubes, shell, tubesheets, baffles, and acid nozzles are fabricated from stainless steel. Corrosion of these components is controlled by the application of the anodic protection system, which generates a protective oxide film on the acid wetted surfaces.

Add Coo~er Operating &.

~~~int~~nancef'4zUfHJal

Chapter 2

-:2 System Description

I

CHAPTER 3

ANOTROL

®

2000 SYSTEM

•

Controller/Power Supply (C/PS) Power Supply

Main AC Power Configuration Controller

CIPS Board Configuration Hardware Fail Safe

I

Fuses and Connections

•

Remote Display Unit (RDU) Overview Screen Event Log Screen Configuration Mode Detail Screen

Adjusting Labels, Set Points and Alarm Values Operational Alarms Low Alarm High Alarm Process Page 1 Process Page 2 Process Data RDU Software Setup

PC to RDU Data Transfer

I

RDU Shutdown Procedure

•

CIPS Activation and Shutdown Activation via RDU Activation from C/PS

CIPS Shutdown from RDU CjPS Shutdown from C/PS

•

Communication Failure

Add Cooler

I

f

[

.. , :",

I

I

i ...

CHEMETICS

ANOTROL

®

2000 SYSTEM

~

'.'\

'

·.'

i,.. ,: ',":, "; ,:'f

The Anotrol® 2000 system is comprised of a Remote Display Unit (RDU) plus a dedicated Controller/Power Supply (C/PS) for each acid cooler or storage tank. A maximum of six ReferenceElectrodesand up to twelve process inputs per C/PSmay be monitored.

,;,..1 The C/PS is the main functional unit of the Anotrol'" 2000 system as it contains both the

hardware to supply the power to the Cathode(s) and the microprocessor, which measures the anodic potentials and adjusts the current output from the power supply to achieve and maintain the passivefilm.

The C/PS is designed to accept either 115 or 230 VAC (field selectable) which is supplied to the system at the terminal strip on the rear panel of the chassis. This AC power is supplied to the Power Transformer via Fuse Fl and the internal stabilized Power Supply for the

microprocessors via FuseF2.

Before applying power to the Anotrol® system, check to ensure that the line voltage is correct, the power wiring at the terminal strip is in accordance with the labels and that the main PC Board Voltage Selector Switch and Station Number Selector are properly set.

I

j

I

ROU

Add Cooler

Operating &: Maintenance Manual

C/PS

Chapter 3 - 2 Anotrof19 _{2000 System}

ED

I

CHEMETICS

CONTROLLER I POWER SUPPLY (C/PS)

Power Supply

The AC voltage is reduced to the required level by the Power Transformer located at the top of the chassis, before being full-wave rectified by the steering Diodes: Dl and D2, located on the right-hand internal heat sink. Anodic current flow is controlled by MOSFETs: Ql and Q2, located on the left-hand internal heat sink. Heat dissipated by the steering Diodes and MOSFETs is distributed by the internal heat sinks, which are thermally coupled to the sides of the enclosure. The controlled output voltage is supplied to the vessel via two terminals marked Cathode and Anode.

Main AC Power Configuration

r::·.,

t.Li

Both the C/PS and the RDU are set up at the factory in accordance with the specifications for the project site.

The RDU is capable of operating from an AC power supply of between 90/264 VAC, 50/60 Hz. The C/PS AC power is adjusted by way of jumpers located on the rear panel of the chassis. The diagram of the jumpers indicates their proper connection. The PC Board has an internal Voltage Selector Switch, which must be set for the correct AC power being supplied.

All of the connections discussed above are checked and adjusted by a Chemetics Technical Service Representative during commissioning.

Controller

The microprocessor-based Controller is located in an internal enclosure in the lower portion of the C/PS. The Controller PC Board Assembly is mounted to the back plate of the C/PS enclosure using two screws and is a complete replaceable assembly (including the aluminum box).

Except for initially setting the configuration of the Station Number for communication

to

the RDU and Voltage Selector Switch, the controller box should not be removed for any reason as there are no fuses or replaceable parts inside.

Acid Cooler

.

E

I

I

If

cit!

CHEMETICS

[J

. "" ... 1

n

t.,:.,,"j l; .{ "

The Controller PC Board Assembly has four connectors that interface the wiring to external circuitry .

The connector P2 provides the AC power to the Assembly. Selection of 115 VAC or 230 VAC is made with a Voltage Selector Switch that is on the underside of the PC Board and is only accessible when the Board is removed from the box. It is set at the factory in accordance with the specifications for the project site .

The connector Pi provides the signal from the current measuring shunt and the signals to the MOSFETs.

The connector TBl labeled ELECTRODES provides the interconnection points for the RS-422 digital communication, Cathode Voltage input, Control Electrode and up to five Reference Electrodes. Any Reference Electrode inputs that are unused should have jumpers

I

installed.

The connector TB2 labeled PROCESS provides the interconnection for up to twelve 4-20 rnA process input signals. Each input is supplied with 24 volts to power a Process Transmitter. Each pair of channels is over-current protected to prevent the failure of the 24-volt internal stabilized Power Supply in the event of an external short circuit.

I

I

I

....,;

Acid Cooler

CHEMETICS

CONTROLLER POWER SUPPLY (C/PS) (PIN 079650)

I

VAC Power & Jumpers Fuses F1 & F2 Add Cooter

.

C/PS Board Configuration

Each

C/PS

is independently configured to operate as part of a total anodic protection system. Each

C/PS

has it's own specific address within the system and can be configured to display different values dependant on the set up of the acid cooler, storage tank or acid piping system to which it is connected.

If it is necessary to change a

CIPS

Board for any reason, the configuration of the board must be set to correspond to the address and service of the unit.

The Station Number of a

C/PS

can be changed by resetting the Station Number Selector Sl located on the PC Board as follows:

I

I

._.

.

First remove AC power to the C/PS.

Disconnect all plug-in connectors from the Controller PC Board Assembly.

Remove the two screws securing the Controller PC Board Assembly to the C/PS rear panel and remove box from

C/PS.

Remove the six cover mounting screws and carefully lift the PC Board Assembly from its support box to allow access to the Station Number Selector located in the center of the board (see Fig. 3.1 at the end of this chapter).

Examine the position of the four dip switches on the Station Number Selector. Reposition these switches of the new PC Board to correspond to the required binary address for the Station Number assigned to the CjPS.

Confirm Voltage Selector Switch is set for correct AC power supplied. Install new PC Board Assembly in C/PS and connect all plug-in connectors. Activate power to the

C/PS.

Hardware Fail Safe

In case of a microprocessor failure, a backup hardware Fail Safe is provided on the

CIPS

Board. The hardware Fail Safe setting is only field selectable, requiring a voltmeter and a small screwdriver.

NOTE: The unit Fail Safe is factory set at a 600 mV set point.

Two test points are provided on the top of the PC Board inside the C/PS enclosure. The test paints are labeled:

FAIL SAFE VOLTAGE

+

Acid Cooler

r The Fail Safe set point adjustment is made by a trim pot, accessed through the cover labeled:

SETPOINT ADJUST.

WARNING: If both the red and green status lights are illuminated, stop the unit or turn the green light off. Once the control millivolt signal drops below Fail Safe set point, the Fail Safe may be reset. The C/PS will then return to Idle mode, and the unit may be restarted from the C/PS or RDU.

Fuses and Connections

There are two fuses associated with the primary power wiring circuits: 1) The Power Transformer F1

2) The Controller PC Board F2

r -v

I ;

\, . ..:

n

L1... ._, ~

I

I

<

I

I

\ .. ,," Add Cooler

Operating Sa. Maintenance Manual

Chapter3·7 Anotrofv 2000 System

~..

1

o

1

~

i

I

CHE~JlETICS

t

q

II

REMOTE DISPLAY UNIT (RDU)

,

.

..

'

The RDU is a fully functional PC with a touch screen that interfaces the PC electronics with each C/PS through an RS-422 communications channel .

' _..

~

J

The RDU is the operator's interface with each functional C/PS and is used to:

~

{J

1) Display the anodic film status for each anodically protected vessel. 2) Adjust set points and alarm parameters.

3) Start and stop the anodic current output from the C/PS. 4) Display to the process parameters for each acid cooler.

5) Download data to a DCS via the RS-232 communication channel. 6) Troubleshoot individual anodic protection

system.

I

7) Connect a remote alarm to relay through TB3.

The RDU is connected to each C/PS by a dedicated two-wire shielded communication cable. The screen uses a color LCD with an integral touch screen. The touch screen is used for all operator interface functions. It also provides the operator with a read out of either the status of the operating acid cooler/tank or the set point and alarm settings for the microprocessor.

Overview Screen

When the RDU is first powered up, it automatically loads the Windows® 2000 operating system and the RDU program. At the conclusion of the start-up sequence, the Overview screen is displayed. This screen displays up to twelve acid cooler and/or tank icons and four function keys. The function keys are About, Log, Config and Exit.

About

The About key, when pressed, will indicate the version of software and the technical assistance phone and fax numbers along with the e-mail address for technical assistance.

Add Cooler

CHEMETICS

--I

Log

The Log key, when pressed, will display the Event Log screen for the cooler/tank selected.

Config

The Config key gives access to the Configuration mode, it is password protected.

(

,

' ....

L .

Exit

The Exit key, when pressed, will allow the RDU

to

exit the program and return to the Windows@ program. If changes were made, you will be prompted to save them.

The RDU will scan for active C/PS units as seen on the Overview screen. Any units not in Active mode or in an alarm state will be red. Active units will indicate a solid green display along with the name of the operating cooler/tank. The cursor below the icons will move between each unit

in operation.

Event Log Screen

The Log key gives access to the Event Log screen for the cooler selected. It indicates the date, time, unit number, and a brief description of any occurrence with the unit on display. Six keys on the right side allow the user options as follows:

I

,,,

..

C":l.~;.?"~1,X FCtJf'~CN ~J~/>~~t.iFf (~Ie.~~k_ c.~~at. ~~"'~~IoIc~K _...a.wrr. PgUp

This key is used to page up through the Event Log screen, one page at a time. Add cooler

CHEPJlETICS

I

I

Up arrow

This key moves the cursor up one item at a time.

Down arrow

This key moves the cursor down one item at a time.

PgOn

This key is used to page down through the Log Screen, one page at a time.

Clear Log

This key is used to clear Log Screen of all stored data. It is password protected.

Back

This key returns user to the Overview screen.

I

Configuration Mode

The Config key on the Overview screen is password protected, this limits access to the Configuration mode. Enter the correct password and touch OK. This is the channel configuration screen and allows the configuration of up to 12 C/PS units to be displayed. Seven keys on the right side allow entry to further set up operations as follows:

New Passwd

This key is used to enter a second password. Press key. Enter new

password, up to 20 characters and touch OK.

Save Config

This key is used to configure which unites) is in operation. When all units have been accepted, (cursor indicated below icon(s)), press the Save Config key to accept this configuration. During operation the cursor moves between all icons in use, skipping those not configured.

Add Cooler

Operating & Maintenance Manual Chapter 3

M 10

CHE~JiETICS

I

I

II

.

I

Defaults

This key clears the history and loads default settings of the displayed unit. Press "Yes" to continue or "No" to return to the Overview screen.

WOO

Watch dog timer disabled.

Run

This key is used to return to the Overview screen.

Exit

This key is used to exit the program and return to the Windows® 2000 program. If changes were

made you will be prompted to save them. This operation is password protected.

tI

Detail Screen

=-To bring up one of the units in operation, touch the icon on the Overview Screen to enter the Detail screen, for that unit. The top left box indicates the name of the operating vessel, the top right box indicates the status of the unit, and the right side boxes are function keys.

This page will reveal the status of the Anotrol system and show the following data plus any alarm conditions within the Anotrol system.

Cathode Current

Amperage being sent to the cooler/tank.

Cathode Voltage

Actual DC voltage applied at the Cathode.

Control Potential

DC millivolt Signal from the Control Electrode located at the acid inlet area of the cooler.

Outlet Potential

DC millivolt signal from the Reference

Electrode located at the acid outlet area of the cooler.

Reference A - 0

DC millivolt signal from up to four other Reference Electrodes on line. Add Cooter

Operating &. Maintenance Manual _Anotror

v

Chapter 3 - 11_{2000 System}

['

t ...,...

L

CHE~JlETICS

I

On the right side of the screen the following function keys are available:

Start

The Start key will activate the unit being displayed and the red Idle unit # icon will change to Active green. This will allow flow of DC current to the vessel provided the Control Potential is below its set point and there are no high alarms.

Stop

The Stop key will de-activate the unit being displayed and the green Active unit # icon will change to Idle red. DC current will be discontinued.

History

The History key will load History screen, which indicates the selected parameter history. Keys are included on this screen to change the time base and to turn the Control Electrode Data on or off. The Back key returns user to the Detail screen.

Config

The Config key is password protected to limit access to the Channel Configuration screen. Enter the correct password and touch OK. This screen allows the configuration of the unit on display.

I

History Screen

Add Cooler

CHEMET!CS

I

Adjusting Labels, Set Points and Alarm Values

These values are pre-set at the factory, checked, and adjusted by the Chemetics Technical Service Representative during commissioning.

Adjustment of the programmed values should only be done under the instruction of Chemetics. Random adjustment or incorrect setting of these values may result in serious damage/corrosion to the cooler/tank.

If it is necessary to modify the channel configuration: ₁

r

_!

!...)

1) Call up the C/PS to be modified from the Overview screen.

2) Select the Channel Configuration screen from the Display screen, by touching the Config key. The Configuration screen is password protected. Enter the correct password and touch OK (obtain code from Chemetics, Technical Service Department).

3) From the Channel Configuration screen, select the item to be modified.

Cooler Name

Using the touch screen, insert or change the title of the unit in service. Up to 20 characters may be entered. When completed the OK key should be pressed and you will return to the previous page.

Serial Number

Using the touch screen, insert the serial number of the equipment in service. Up to 20 characters may be entered. When completed the OK key will return you to the previous page.

Description

Using the touch screen, insert the description of the equipment in service. Up to 20 characters may be entered. When completed the OK key will return you to the previous page.

Set Point Alarms

Using the Select Slider key move through the set point and alarms to be changed. The Up and Down arrows will adjust the set point to the required setting (review the recommended settings in chapter 4 page 11). After all changes have been entered, the OK key will return you to the previous page.

System Type

Using the touch screen, select cooler or tank. r

L

Acid Cooler

Operating &. Maintenance Manual

(

Chapter 3 - 13

L

Anotrol'Si 2000 System

CHEMETICS

I

I

Cooler Type

Using the touch screen (Up & Down arrow keys), select the number of electrodes not counting the Control Electrode being used. Cathode current can be changed between 60 and 100 amps (most coolers are set for 60 amps, tanks to 100 amps). Une frequency can be changed from 50 to 60 Hz. Graphic display Down arrow will cycle through different cooler and tank drawings, select the one required and press the OK key to return to the Channel Configuration screen.

Proc Parameters

This page is used to enter the data for the set up of the actual process parameters, which are to be displayed at the RDU. On/Off key activates or removes the parameters from the circuit. Parameters key allows entry to the Parameter: Labels, Scale 1&2, and Alarms 1&2 pages. Once all settings have been entered, the OK key returns you to the Channel Configuration screen.

Proc Calculations

This page is used to enter the design data (2 pages) for the unit in operation. Once all data has been entered, the OK key returns you to the Channel Configuration screen.

Defaults

The Defaults key on the Channel Configuration screen clears the history and resets parameter default values for this unit.

4) When all changes/values have been entered, press the Save key.

I

The changes will be entered into memory and the screen will return to the Detail screen.

NOTE: Set points may be edited with C/PS in Idle or Active mode.

Operational Alarms

To alert the operator of a situation within the Anotrol" System, the system has a series of alarm points programmed into the C/PS.

An alarm indicates to the operator that the anodic film is becoming unstable and that some adjustment may be necessary. Most often, the adjustment required should be to the process and not to the Anotrol" electronics.

CHEMETICS

& Maintenance Manual _{Chapter 3 - 14}

CHEMETICS

,

('"

I '

1. .••.•

r

L.~

I

,

When an alarm value is reached, an audible alarm within the ROU will sound to draw attention to the situation.

Low Alarm

A Low Alarm indicates that the potential across the anodic film at the Acid Inlet region (Control Potential) of the vessel has dropped to a level indicating lack or loss of the anodic film required to control the corrosion within the vessel.

This condition will normally be encountered when the Anotrol" system is first activated at start-up when there is no anodic film present and may also occur during major process changes where the anodic film is being eroded away faster than it is being restored by the Anotrol" system.

If a Low Alarm occurs, the CIPS will continue applying current to the vessel and the RDU will: Sound an alarm

Flash the icon on the Overview screen corresponding to the

CIPS

in alarm. Cause the Control Potential, unit Active # and the Channel Number to flash red. Press Control Potential on the screen to silence the alarm.

When the Low Alarm condition is corrected the red LED's will turn green. If alarm is audible, it will silence automatically.

I

I

L...

I'

,

' '--Add Cooler

Operating & Maintenance Manual

Chapter 3 ~ 15

L

Anotrot(1Y 2000 System

High Alarm

A High Alarm prevents the potential from entering the TRANSPASSIVE REGION where the protective film becomes unstable, indicating that the anodic potential has climbed above the High Alarm set point. If this high voltage condition continues the anodic film becomes highly soluble in the acid and corrosion takes place at an accelerated rate.

If a High Alarm occurs, the

C/PS

anodic current will automatically shut down and the RDU will: Sound the internal alarm

Flash the icon on the Overview screen to indicate which unit is in alarm Detail screen will indicate which value caused the alarm

Pressing the flashing label on the Detail screen will silence the audible alarm.

To reactivate the

C/PS

from a high alarm shutdown on the Control Electrode press the Start key. Reactivation of the

C/PS

from a high alarm shutdown on the Outlet Electrode can only be done locally at the

C/PS.

I

,~:,I

.,.;

WARNING: The C/PS will not automatically restart after

a

high alarm. It must

be

re-activated manually.

Add Cooter Chapter 3 - 16 Operating & Maintenance Manual Anotro'® 2000 System

I

Process Page 1

This page is activated from the Channel Configuration screen and a key to this page can be displayed on the Detail screen. This page will reveal the status of the Acid and Water Temperature readings along with any alarms related to temperature.

Process Page 2

This page is activated from the Channel Configuration screen and a key to this page can be displayed on the Detail screen. This page will reveal status of other input data and alarms if required. Example: acid/water flow, water pH, filter status, water pressure, acid strength.

Add Cooler

CHEMETICS

Process Data

This page is activated from the Channel Configuration screen and a key to this page can be displayed on the Detail screen. This page will allow for Cooler Calculation. The Design and Operating data for the cooler(s) are entered by user and several calculations may be obtained: e.g. fouling, heat load, velocity etc. The Back key returns to the previous page viewed.

I

Acid Cooler

I

RDU Software Setup

1) Copy the RDU software package (Setup.exe, Setup. 1st, RDU1.cab, RDU8.cab) in the panel PC:

a) Using network connection.

Connect keyboard, mouse and network cable to the panel PC. Setup and log into the network (ask the network administrator for details). Create directory c:\RDUlnst and copy the RDU software package files into this folder.

b) Using serial port communication.

Use service program to copy the software package in the panel PC via the serial port. The default folder of this communication is C:\HTBuffer\ (see the Service

program

description for details). 2) Install the RDU program:

• Start, Run C:\RDUlnst\Setup.exe OK (Start, Run C:\HTBuffer\Setup.exe, OK) • Accept the default values in all Install dialog boxes.

3) Modify the Windows® startup procedure (new system logo screen, and startup application).

• Run, Browse (C:\Program Files\RDU\RDUsetup.bat), OK.

• Create New Shortcut to C:\ProgramFiles\RDU\RDU,exe in the Desktop. • Copy the RDU Shortcut in the folder.

C:\ Windows\AIIUsers\StartMenu\Programs\Startup. 4) Test the RDU installation: Start/Shut Down/Restart/Ox. 5) Disable the power savings functions:

Control Panel, Power Management, Power Schemes tab. • Power Schemes: Always On.

• Turn off monitor: Never • Turn off hard disks: Never.

6) Disable Network connection and User profiles.

A.dd Cooler

CHEMETtCS

I

I

PC to RDU Data Transfer

Since the standard panel PC configuration does not include floppy or CD devices, information between the panel PC and other systems can be exchanged via the network or serial ports. The most convenient way is to use the network functionality. The panel PC provides a NE 2000 compatible 10-Base T Ethernet (RJ4S) interface.

If a network connection is not available, the data between the panel PC and remote PC can be exchanged via the serial ports. The operating system Windows® 2000 provides appropriate tool for COM port communications - HyperTerminal.

Data Transfer Using the Panel PC Service Program First install Service program on the panel PC:

I

1)

2) 3)

Connect keyboard, mouse, and network cable to the panel pc.

Setup and log into the network (ask the network administrator for details).

Create directory C:\ServInst and copy the Service software package files into this folder. (Setup.exe, Setup.lst, Servic1.cab and Service2.cab).

4) Install the Service program:

• Start, Run, Browse (C:\ServInst\Setup.exe), OK. • Accept the default values in all Install dialog boxes. 5) Create New Folder C:\HTBuffer.

Like all general purpose programs the HyperTerminal is designed for working with mouse and keyboard. To make the HyperTerminal usage with panel PC more convenient, a small external touch screen interface program is provided. This program starts and sets the HyperTerminal in file transfer mode (Receive) using the Zmodem protocol.

Step 1:

Disconnect the serial cable from the multiplexer box and connect the cable to the COMl (COM2) port of the remote PC.

Step 2:

Setup the HyperTerminal session on the remote PC with the following parameters: • Start/Programs/ Accessories/Communications/HyperTerm inaI

• Double click Hyperterm.exe icon - "Connection Description" dialog appears.

• Enter the Connection Name (for example RDUcon). Click OK - "Connect to" dialog appears.

Add Cooler

CHEMETiCS

I

• Select Direct to COMl (Direct to COM2). Click OK - COM1 "Properties" dialog appears. Select: • Baud Rate: • Data Bits: • Parity: • Stop Bits: • Flow Control: • Click OK 115200

8

None 1 Hardware Step 3:

Start the Service program on the panel PC (double click the Service icon or use Start/Run dialog (the executable file is in C:\Program Rles\Service folder). The Service program window appears in the upper left corner of the screen.

Step 4:

Press the Open HyperTerminal command button. The HyperTerminal window appears on the screen.

Step 5:

Start the HyperTerminal session on the remote PC:

• Select Transfer, Send File on the main window - the Send File dialog appears on the screen.

• Select Protocol = Zmodem.

• Use the Browse function to select the name of the file you are going to transfer. Now

Step 6:

both the panel and the remote PC are prepared for communication.

Press Start Receiving button on the Service program window. The Zmodem window appears on the screen.

Step 7:

Press the Send button on the remote pc. The Zmodem window appears on the remote PC too. The data transfer begins and the progress bar indicates the activity. After the transfer is completed, the Zmodem windows on both computers are closed.

Step 8:

Press Close HyperTerminal and Exit on the Service program window. Select No button on the dialog box question "Is the Zmodem window closed?"

Step 9:

Close the HyperTerminal on the remote PC.

Add Cooler

Operating &. Maintenance Manual

I

Chapter 3 - 21

t_

Anotrol's 2000 System

CHEMETICS

I

Oata Transfer without Service Programme Step 1:

Disconnect the serial cable from the multiplexer box and connect the cable to the COM1 (COM2) port of the remote PC. Connect the keyboard to the panel Pc.

Step 2:

Setup the HyperTerminal session on the remote PC with the following parameters: • Start/Programs/Accessories/Communications/HyperTerminal

• Double click Hyperterm.exe icon - "Connection Description" dialog appears.

• Enter the Connection Name (for example RDUcon). Click OK - "Connect to" dialog appears.

• Select Direct to COM1 (Direct to COM2). Click OK - COM1 Properties dialog appears. Select: • Baud Rate: • Data Bits: • Parity: • Stop Bits: • Flow Control: • Click OK. 115200 8 None 1 Hardware Step 3:

Setup the HyperTerminal session on the panel PC computer with the following parameters:

• Start/Programs/Accessories/Communications/HyperTerminal

• Double click Hyperterm.exe icon - "Connection Description" dialog appears.

• Enter the Connection name (for example RDUcon). Click OK - "Connect to" dialog appears.

• Select Direct to COM1 (Direct to COM2). Click OK - COM1 "Properties" dialog appears. Select: • Baud Rate: • Data Bits: • Parity: • Stop Bits: • Flow Control: • Click OK. Add Coeler

Operating & Maintenance Manual

115200

8

None 1 Hardware Chapter 3 - 22 Anotrol® 2000 System

I

Step 4:

Start the HyperTerminal session on the panel pc:

• Select Transfer, Receive File on the main window - the Receive File dialog appears on the screen.

• Select Protocol = Zmodem.

• Use the Browse dialog, select a receiving folder.

Step 5:

Start the HyperTerminal session on the remote pc.

• Select Transfer, Send File on the main window - the Send File dialog appears on the screen.

• Select Protocol = Zmodem.

• Use the Browse function to select the name of the file you are going to transfer. • Now both - the panel and the remote pc are prepared for communication.

Step 6:

Press Receive button on the panel PC - Zmodem window appears.

Step 7:

Step 8:

Press the Send button on the remote PC. The Zmodem window appears on the remote PC too. The data transfer begins and the progress bar indicates the activity. After the transfer is completed, the Zmodem windows on both computers are getting dosed.

I

Close the HyperTerminal on the panel and remote PC.

RDU Shutdown Procedure

From the Overview screen press the Exit key. Answer Yes to exit the program.

Press Windows® Start key. Press Shut Down key.

Press OK key to shut down the computer. Tum off AC power when screen displays OK.

Acid Cooler

C/PS ACTIVATION AND SHUTDOWN

The

CIPS

can be activated or stopped either from the RDU or locally.

When AC power is first applied to the

CIPS,

the system will power up in the Idle mode. In this mode, the Controller will monitor all input signals from the Reference Electrodes and Process data. No current will be applied to the vessel. Alarm status will be indicated in red or green for all units in service. Cursor will move between all units in operation, skipping those that are not used.

Activation via RDU

Select unit to be started. The Detail screen is opened.

This screen will show the Anotrol Page along with current values of the active Reference Electrode inputs. A low alarm may be indicated in three ways: the flashing red unit #, flashing Control Reference reading, and the red flashing Channel Number box.

... , Press the Start key. Unit # Idle (red) goes Active (flashing red or steady green):

Red Alarm condition

I

Green No alarm condition

The unit is now active and current will begin to flow to the vessel, providing the Control Potential is below the Control set point and there is no High Alarm.

The current will increase in value to a maximum of 60 amps (100 amps for tank systems). Once the Control Potential rises above the Control Low Alarm set point, the red LED's will turn green. When the Control Potential nears the Control set point, the current would reduce automatically and gradually according to the proportional Band setting, to maintain passivation.

-'-' Activation from

C/PS

To activate directly from the

CIPS,

locate the ACTIVE and FAIL SAFE lights (LED's) and switches which are situated on the top of the Controller PC Board Assembly.

In the Idle mode, both LED's will be off.

Add Cooler

I

I

To start the unit, press the ACT/MaN switch; the green Active light will come on indicating that anodic current will soon be starting, should the Control Potential be below it's set point.

The output current can be monitored via the Shunt Voltage terminals on the PC Board (25mV for

100~amp avg.).

Pressing the ACT/MaN switch again will shut down the C/PS output and return the C/PS to the Idle mode. The green Active light will go out and the RDU channel will go into Idle red mode. The C/PS may be run completely independently of the RDU. However, no changes can be made to set points and no alarms will be monitored.

C/PS Shutdown from RDU

P""") ! ' I , j ; 1...1 ..

I

!,\! From the Overview screen select unit to be stopped. The Detail screen is opened.

I

Press Stop key. The C/PS anodic current will stop. The green Active and green Channel will

turn red, the green Active light will also return to Idle mode.

C/PS Shutdown from C/PS

The ACT/MaN switch on top off the Controller PC Board Assembly will stop the unit. Pushing this switch will stop the anodic current and the green light will go off.

COMMUNICATION FAILURE

If communication is lost between the RDU and anyone of the CIPS units connected to it Channel

# on the Overview screen of the RDU will turn red Comm. Err.

If this situation should occur, an instrument technician familiar with the system should investigate. When the condition causing the alarm is cleared, communications will be re-established and the alarm will reset automatically.

Add Cooler

Fig 3.1

F"1

L;,

[J

STATION NUMBEIt & SYSTEM CONFIGURATION INSTRUCTIONS ANOTROL®2000

FOR CfPS CONTROLLER ASSEMBLY PH: 07i&66

CAUTION: REMOVE A.C. POWER TO THE CONTROLLER

ASSEMal Y BEFORE ADJUSTING OR RECONFIGURING THIS UNIT.

When replacing a CIPS Controller Assembly, you mUSt configure the unit for the desired

Station Number and proper voltage prior to in~tallation in the enclosure cabinet

TO'access the adjustments, remove the (6) cover rT\9Unting screws. Carefully lift the cover

up and If.Y bottom side up on a clear, flat surface. Be carefull NOT to disturb any of the

components on the PC board. Make settings as indicated below.

I

STATION NUMBER SELECTOR (51 ) VOLTAGE SELECTOR (115V I 23OV)

STATION NUMBER SELECTION SWITCH CIP

,

S STATION NUMBE

.

R

, •

NUMBest _{1 1}

..

5 I 7 . 10 11 11 1 OFF ON OFF ON OFF ON OFF ON OFF ON OFF ON

2 ON OFF OFF ON ON OFF OFF ON ON OFF OFF oN

3 ON ON _{ON OFF OFF} OFF OFF ON ON ON ON OFF

..

ON ON ON ON ON ON ON OFF _{OFF OFF OFF OFF}

CoRR?RO C()1jPANr~. ROHRBACK COSASCO SYST~ ~ 07Q65£ R!Y He

j i

!

Add Cooler

,

CHEMETICS

I

CHAPTER 4

OPERATING PROCEDURES

•

General ·..1,. ( LJ

I

•

Acid Side Considerations Temperature Limitations

Causes and Effects of Weak Acid

•

Water Side Considerations Water Flow Rates

Water Filtration and Treatment pH and Conductivity of the Water Maintenance of the pH Monitors Freeze Protection

•

Particular Operating Considerations Energy Recovery Acid Coolers

Water Quality

Prevention Against Creating Boiling Water Conditions pH Monitoring

Brackish and Seawater Coolers Seawater

Seawater Filtration

Seawater Treatment Against Biofouling, Etc. pH Monitoring

•

Summary of Operating Instructions The Cooler Rating Sheet(s) . The Water Flow Diagram

. Start-up Procedures Data Collection

•

Normal Operating Conditions

•

Shutdowns

Short Term Plant Shutdowns -less than 24 hrs long Term Plant Shutdowns

Emergency Shutdown

Emergency Shutdown for Cooler Tube Leaks

Preparation of the Cooler Shell Side for Extended Shutdown • Anotrol® Readings

Acid Cooler

I

I

I

OPERATING PROCEDURES FOR ACID COOLERS

GENERAL

This chapter details the operating principles for the Chemetics acid coolers. It is important that all the procedures detailed in this chapter are clearly understood by all operating personnel. The recommendations are based upon sound engineering considerations and extensive operating experience.

The various operating considerations, detailed in the following sections, form the basis for the operating procedures. These procedures are summarized later in the chapter.

ACID SIDE CONSIDERATIONS

I

Temperature Limitations '~","" '·1 .

>

;.,:.

1

.,;

Anodic protection significantly increases the temperature limits for which stainless steel can be used in acid service without the initiation of corrosion. Safe design limits have been established and should not be exceeded during operation. The maximum operating temperature is a function of the acid concentration. Lower acid concentrations correspond to lower maximum temperature limits. These limiting temperatures are plotted against acid concentration, as shown in the following figure .

The summary sheets at the end of this chapter define the specific operating temperature limits for this application.

It is important to 140 note that if during 120

operation the acid 0

o ~ 100 strength should Q)

"-drop, then the acid

~

e

80 Fig. 4.1 temperature must be lowered secor-Q) 0.₆₀ E Q) dingly. Do not """40

operate in the

non-shaded area above 20 the line.

_a

91 92 93 94 95 96 97 98 99

% H2S04

Under no circumstances must the acid concentration be allowed to fall below 900/0 unless the equipment has been designed for this lower strength duty.

Acid Cooler

I

Causes and Effects of Weak Acid

If the acid concentration is allowed to fall, then it may be difficult, or indeed impossible, to establish a stable passive film on the acid wetted surfaces of the cooler. If the cooler is in operation, then the established passive film may be lost. Continued operation of the plant under these conditions is extremely detrimental, not only to the cooler, but also to the associated pumps and piping.

The causesof weak acid formation are

•

Erratic control of water addition.

•

Defective strength analysis equipment which controls water addition to the circuit.

• Accidental water dilution during shutdown caused by a valve being stuck in the open position. • Dilution of the circulating acid by moisture absorption during start up while the plant is being

dried out.

• A tube failure will cause the cooling water to flow into the circulating acid if the water pressure is more than the acid pressure (see section 4).

•

During a plant turnaround, acid may be drained from the cooler and the shell opened to atmosphere. Sufficient moisture can be absorbed to ditute the acid remaining in the cooler to extremely corrosive concentrations. The weak acid formed will accumulate at the low point of the cooler. It is therefore essential, that the main and expansion joint drain valves remain open during the period when the cooler is empty and that acid side openings be covered with plastic to minimize moist air ingress.

• Weak acid run-off from the tower during shutdown of extended duration.

Acid Cooler

I

I

I

I

F;

. . " ~

tU

o

,.

CHEMETICS

WATER SIDE CONSIDERATIONS

Water Flow Rates

The coolers have been designed for a high velocity water flow through the tubes. This high velocity minimizes hard water scale formation and ensures that tube wall temperatures are maintained as cool as possible. During operation, design or greater water flow must be maintained. Temperature

nJ

control of the acid must be made using the acid by-pass around the cooler.

Throttling the water flow to the cooler must never be used to control the acid temperature.

The easiest method of monitoring water flow through the cooler(s) is by measurement of the waterside pressure drop across the cooler. If the pressure drop is above the specified differential in the operating summary, the water flow will be adequate providing there is no fouling or tube

I

blockage.

Water Filtration and Treatment

I

'''''I

I

Fine sand and other small particulate material should not present any problems in the operation of the coolers. In fact, their presence could be beneficial in retarding scale formation of the tube bores due to their scouring action. However, It is possible, particularly on once through water systems, that pieces of debris and fibrous material may also be present. This material could lead to partial or complete blockage of some tubes. If this should occur, the stagnant water In the tube will rise to the temperature of the surrounding acid which would, in some cases, reach the boiling point. This condition may result in stress corrosion cracking and ultimately tube failure. It is therefore, extremely Important that tube blockage be avoided.

Operating experience indicates that water treatment is usually required for cooling tower systems.This need should be carefully assessedand implemented before start-up.

..;:J

On all cooling systems, it is mandatory that adequate filtration be provided to prevent tube blockage. This can be accomplished in a number of ways; basket type filters, rotating drum filters, etc. The filtering systems must be designed to ensure that full water flow is present at all times. The mesh size of any filter shall be less than the bore of the cooler tubes in this way, only small pieces of debris will be present and will safely carry through the tubes.

Acid Cooler

I

t

[

I

i

rm

CHEMETICS

P!

tJ

pH and Conductivity of the Water

There are several good reasons for installing a pH monitor/alarm system:

• If the cooling water is re-circulating (e.g. cooling tower), a pH control system is usually part of the water treatment program. To ensure that the pH never drops below 6.0, it is advisable that a pH alarm is set at 6.5, and in some cases, automatic neutralizing of the circuit can also be activated. This is especially useful if acid gases from the plant are drawn into the cooling tower water, thus forcing the pH down to serious levels.

• For coolers having acid to water leak path (acid pressure higher than water pressure - the preferred case), a pH monitor/alarm in the discharge water line of each cooler will provide timely detection of a tube leak after which immediate stoppage of the plant can be accomplished, thus restricting the amount of cooler damage to one leaking tube.

• For closed loop (demineralized water) systems or boiler feed water applications, conductivity may also be required to assure that good quality water is being used. Alarms can also be set to automatically activate isolation and bypass valves at the cooler plus drain any acid contaminated water out of the cooler. This will minimize damage to the cooler, plus any other equipment downstream, should an acid-to-water leak develop.

• Occasionally, the cooling water supply can become acidified for reasons external to the plant (e.g. inadvertent dumping of acid into the water). The presence of acid in the cooling water could initiate pitting in the tubes: If the pH of the inlet cooling water should drop, then it is mandatory that the coolers be neutralized using a 5% caustic solution as soon as the water conditions have returned to normal and the plant shut down. Chemetics should be notified of this occurrence (see chapter 7 - Neutralizing Waterside of a Cooler after a Tube leak).

W

Maintenance of the pH Monitors

• pH electrodes can lose their sensitivity

I

as a consequence of dirt accumulation

on the probes. If this occurs, then it will often require an extremely low pH in the water to first clean the electrodes prior to sounding the alarm. Fig. 4.2 shows the pH monitoring system recommended by Chemetics. This system enables the electrodes to be tested weekJy by the addition of a few drops of acid to the sample pot. The electrodes should be cleaned when their response is found to be slow.

Acid Cooler

Operating

&:

Maintenance Manual

Water sampling system for pH measurement

Leeet •• ampllll9 poJrd r• .IIsonabltl distance away from cooler di.charge and .tter .tbawa to

... good milling.

Weekly_on oIacld to teet reapon ..

of pH monhoring eyt.t.m

Pertoratod s.s, Tube """'" Pipe eent.rtiM with two row. of

5116" diameter hoM. on n~'" UN 254SMO Of equivalent

materitJ for Seawater. pH probe

Fig. 4.2 Sample Pot.

Chapter 4 - 5 Operating Procedures f ' ' c

I

L

r

t . .

I

1

!

I

t

f

! ~ :

,

I

CHEMETICS

f""

L

"

:

• As a further check, use litmus paper to verify the reading from the sample pot(s) at least twice per shift (samples should not be taken from the water channel drain or vent valves because a leak could bypass these points). Similarly, litmus paper should always be used to ensure that a low pH alarm is in fact valid and not an instrument malfunction.

Freeze Protection

• It must be realized that a tube bore plugged with debris, rust, etc., will not be self-draining during shutdowns. A tube filled with water will rupture upon freezing. It is imperative therefore that all the tube bores be prevented from plugging or that they be prevented from freezing. Steam injection in the waterside of the cooler can be used.

.

, CAUTION: care should be taken to prevent the condensate from freezing in the

cooler.

I

I

I

Acid Cooler

CHEMETICS

PARTICULAR OPERATING CONSIDERATIONS

Energy Recovery Acid Coolers

Demineralized water must be used as the cooling medium, when the acid cooler forms part of an energy recovery system. This type of cooler normally operates with a Closed Loop water circulating system at elevated water temperatures resulting in high metal (tube wall) temperatures. The design of an Energy Recovery cooler is optimized to make the best possible use of available cooling water to promote efficient heat transfer. Some coolers may be designed to use smaller diameter tubes because of the low water flow available.

,

t ..:

The very high Tube Wall Temperature associated with this type of cooler requires that chlorides present in the water be controlled to minimal levels to prevent possible failure from stress corrosion cracking of the tubes.

Water Quality

• Demineralized water or condensate circulated in the closed loop system must be maintained at a specification of less than 1 mg/litre (1 ppm)

cr

at a pH not lower than 6.5.

• The initial charge of water must be analyzed to ensure that the maximum chloride content does not exceed 1 mg/litre (1 ppm)

cr.

• The water should also be deaerated to minimize dissolved oxygen. Where carbon steel water

I'

piping is used, an oxygen-scavenging agent should be added to the water loop to minimize the

scale formation.

• Precaution must be taken to ensure that debris or additional chlorides do not enter the system. The loop water should be checked for pH and chloride content regularly.

Prevention against Creating Boiling Water Conditions

I

To prevent the possibility of water boiling within the acid cooler, the coolers must operate with

sufficient backpressure to ensure that boiling of the Circulating demineralized water cannot occur in the tubes.

This is readily achieved by placing the demineralized water make-up/head tank at appropriate elevation in the demineralized water loop. Ensure that the water pressure at the outlet of the coolers is maintained at a minimum of 1.0 kg/cm2 _{(15 psig). This pressure will prevent boiling of the water} for a corresponding acid temperature of 120°C (250 OF).

Acid Cooler

i " ...}

I

I

I

1

i

{

.'_""'' '

CHEMETICS

pH Monitoring

This is an important consideration for closed loop systems and the instructions in the previous section must be strictly followed.

Brackish and Seawater Coolers

:~J

Brackish and seawater cooled acid coolers (i.e. coolers operating with greater than 1000 ppm chlorides in the water) require an upgrade in the materials of construction on the waterside.

II

fijI ~

The high chlorides in this type of cooling media requires that all materials in contact with the water be upgraded to withstand attack from the high chlorides, which would cause pitting and lead to early failure of the cooler. Chemetics Seawater Cooled Acid Coolers are fabricated using aRAM~ austenitic stainless steel for the tubing, tubesheets, channel barrels, channel nozzles, and the liner on the channel cover. CIRAM~ has an outstanding resistance to chloride pitting at elevated temperatures and is highly resistant to hot sulphuric acid when anodically polarized (anodic protection).

Seawater Filtration

It is imperative that blockage of the tubes in a seawater or brackish water cooler be prevented at all times, as many of the problems associated with corrosion from high chlorides can be traced to stagnant or low water flow conditions. It is therefore essential that a good water filter be installed to ensure that any particles passing to the cooler will not become lodged in the tubes.

The incoming seawater should be screened through an 8-mm maximum dimension mesh filter. Preferably, this should be a self-cleaning type of strainer but a simple basket type may also be used. If the latter type is used, then two units should be provided in parallel with a suitable switchover device, which is automatically activated by a differential pressure system. Chemetics recommends an inline strainer, similar to that shown in Chapter 5 Fig. 5.3.

Seawater Treatment Against Biofouling, etc.

All coolers are designed to ensure high water velocities through the tubes to minimize the likelihood of fouling by marine life. However, it is possible, that crustaceans and other marine life could accumulate in the less turbulent regions of the supply pipe work and the water boxes. Also, in some regions of the world seawater can contain certain species of Anaerobic Bacteria, which have proven to be detrimental to the use of stainless steels and other materials. Presence of these bacteria and other marine organisms must be controlled by the addition of a suitable biocide.

Chemetics has extensive experience in the area and can provide assistance is testing and recommendation of a suitable programme.

CIRAMET® is a registered trademark of Chemetics and was developed specifically for use in high chloride water.

& Maintenance Manual _{Chapter 4} * 8

n

CHEIV1ETiCS

j '\ t ...,.:.

For more information on Chlorination Guide Lines contact Technical Service Department

CHEMETICS 77 Railside Road Toronto, Ontario CANADA M3A 1B2 Switchboard: (416) 447-5541 Fax: (416) 391-1637 24 Hour Voice Mail: (416) 447-0071

e-mail [email protected]

pH Monitoring

It is essential that the pH monitoring equipment be in good working order at all times. An acid/sea water mixture is highly corrosive and will lead to extensive damage to a cooler. Any suspected tube leakage must be immediately investigated and if confirmed, the plant must be shut down immediately to allow proper repairs of the cooler before extensive damage is done.

WARNING: Failure to obsesv« this condition will invalidate any and all remaining

I':

warranty on the acid cooler.

L_.

Acid Cooler

tJ

CHEMETICS

SUMMARY OF OPERATING INSTRUCTIONS

The following sections are intended to provide a quick reference for operation of the Chemetics acid cooling system:

The Cooler Rating Sheet(s)

The cooler rating sheet(s) specifies the process design conditions and outlines the major mechanical details of each cooler. These may be found on the following pages.

The Water Flow Diagram

A water flow diagram showing the process flow arrangement may be found following the cooler rating sheet(s).

Start-up Procedures

The remaining sections of this chapter summarise the procedures for start-up, normal operation, and shutdown.

These sections must be completely understood by all operating personnel.

I

Data Collection

Plant operators must routinely check key cooler operating parameters to ensure proper operation. To help in possible troubleshooting of the coolers Acid and Cooling Water Temperatures and Pressures plus the Anotrol readings should become part of the normal Plant Data Logging Routine.

Chemetics recommends taking aata every 2 hours but not less that every 4 hours. This data will be invaluable if troubleshoot of cooler performance or Anotrol system becomes necessary.

Acid Cooler

CHEMETICS

NORMAL OPERATING CONDITIONS

Maintain temperatures and pressures within the limits given in the table below. Record the following on a regular basis as per plant schedule:

- acid and water temperatures and pressures in and out of cooler. - ANOTROL® values

- cooling water pH (set low alarm at 6.0 minimum)

OPERATING PARAMETERS VERSUS Drying Tower Absorber Product Acid

COOLER DUTY Acid Cooler Tower Acid Cooler

Cooler

f-'~

I . L_~

(A) Acid Inlet Temperature

Normal operating upper

_°C

_{75.1 112.0 104.1} limit:

(8) Acid Pressure Drop

Through Cooler _{kPa 87.6 73.8 91.1}

Ensure ilP does NOT

exceed:

(C) Water Inlet

Temperature

_°C

_{24.0 24.0 24.0}

Normal operating upper limit:

(D) Water Pressure Drop

Through COOler _{kPa 94.5 75.9 78.0}

Ensure ilP is maintained at or above

(E) ANOTROL ® 2000 Settinas (see chapter 3)

\ _, i '

LG

I

980/0 ACID COOLER 930/0 TO 970/0 ACID & OLEUM COOLERS

a) Readout from the Remote Display Unit CRDU): Control Set Point 300 mV Control High Alarm 450 mV

Control Low Alarm 150 mV

200mV 350mV

SOmV Outlet Potential RA"'RD High Alarm

Band

b) Reading at the Controller/Power Supply COPS): 650mV 100 mV

550 mV ₍₁ 100mV

I

Fail Safe 600 mV 600mV

NOTE: The settings shown above may be changed by the Chemetics Representative for coolers operating under different conditions.

f

I

l.

\

I

..~. ,._

Add Cooler

Operating & Maintenance Manual _{Operating Procedures}Chapter 4 - 11

,

.. I i

i