State of the Art Cathodic Protection Practices and Equipment State of - - PowerPoint PPT Presentation

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Jan 30, 2023 18 likes •462 views

State of the Art Cathodic Protection Practices and Equipment State of the Art Definition: The level of development (as of a device, procedure, process, technique, or science) reached at any particular time usually as a result of modern methods

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State of the Art Cathodic Protection Practices and Equipment

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State of the Art

Definition: The level of development (as of a device, procedure, process, technique, or science) reached at any particular time usually as a result of modern methods

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Cathodic Protection

Type Materials Installation Monitor / Survey Techniques

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Types of Cathodic Protection

Sacrificial Anode Small Current Requirement

Well Coated Structures
Isolated Structures

Low to Medium Soil Resistivity

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Types of Cathodic Protection

Impressed Current Large Current Requirement

Poorly Coated Structures
Shorted Structures

High Soil Resistivity

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Sacrificial Anodes Magnesium & Zinc Typical

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Sacrificial Anode Zinc Ribbon

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GRADE

SINGLE ANODE

PIPE ANODE

AT PIPE DEPTH TO 5' TYPICAL 5' MIN

GRADE

MULTIPLE ANODE

PIPE ANODE ANODE ANODE ANODE

5' TO 15' TYPICAL 10'-15' MIN FOR MAGNESIUM 5' MIN FOR ZINC

TYPICAL SACRIFICIAL ANODE INSTALLATION

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Typical Sacrificial Anode Installation

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Typical Sacrificial Anode Installation

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Typical Sacrificial Anode Installation Ribbon Anode

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Impressed Current Rectifier

Constant Voltage Constant Current Auto Potential Pulse

Alternative Power

Solar Thermo Electric Wind Hydro

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Impressed Current Anode Graphite

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Impressed Current Anode High Silicon Cast Iron

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Impressed Current Anode Mixed Metal Oxide

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RECTIFIER

PIPE PIPE

ANODE ANODE ANODE ANODE ANODE ANODE

TYPICAL IMPRESSED CURRENT ANODE INSTALLATION DISTRUBUTED

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200' TO 500' TYPICAL

RECTIFIER

TYPICAL IMPRESSED CURRENT ANODE INSTALLATION REMOTE

PIPE ANODES

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PIPE

50' TO 400' TYPICAL

ANODE WITHIN SLURRIED BACKFILL

TYPICAL IMPRESSED CURRENT ANODE INSTALLATION DEEP

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GRADE TO ANODE JUNCTION BOX MINIMUM 2'-0" BURIAL SURFACE CASING TO 40 FT VENT PIPE SAND / BENTONITE MIXTURE ANODE LEAD WIRES / HALAR ANODES 10 EACH ON 10 FT CENTERS LOW RESISTANCE BACK-FILL BOTTOM FILLED SLURRIED GRADE 10" 125' 75' 200'

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Impressed Current Anode Installation Distributed or Remote

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Impressed Current Anode Installation Deep

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Storage Tank Bottom CP New Existing

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Vacuum Excavation

Utility Locating
Anode Installation
Reference Cell

Installation

Test Station Installation
Depth of Cover Survey
Expose Pipeline for

Coating Inspection

Subsurface Utility

Engineering

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Vacuum Excavation Utility Locate

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Vacuum Excavation Anode / Test Station Installation

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Cathodic Protection Testing

Equipment Tools Materials Survey Methods

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0.000

CLEAN WATER

HIGH INPUT IMPEDANCE DIGITAL VOLT METER 10 M OR GREATER COPPER/COPPER SULFATE REFERENCE CELL CLEAN, FULLY CHARGED & CALIBRATED TEST WIRES WITH ALLIGATOR CLIPS SELECTION OF SHORT & LONG WITH NO SPLICES CLEAN WATER TO SATURATE THE TEST LOCATION

MISC. HAND TOOLS

TO MAKE MINOR REPAIRS ON-SITE

C.P. TEST EQUIPMENT

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Data Collection Read Only Self Storage

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Reference Cell / Electrode

SATURATED COPPER SULFATE SOLUTION PURE COPPER ROD COPPER SULFATE CRYSTALS POROUS PLUG O-RING SEAL ELECTRODE BODY O-RING SEAL

Contaminated every

time it gets used

Clean Regularly Check Regularly

The “Weakest Link” in

Cathodic Protection Testing

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Cathodic Protection Criteria NACE SP0169

1. ‐850 mV with IR Drop Considered
2. ‐850 mV Polarized
3. 100 mV Polarization

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CP Test Location / Test Station

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0.850 V

PIPE

STRUCTURE TERMINAL VOLT METER REFERENCE CELL TERMINAL PERMANENT REFERENCE CELL

1. CONNECT (+) LEAD OF VOLT METER TO STRUCTURE TERMINAL
2. CONNECT (-) LEAD OF VOLT METER TO REFERENCE CELL TERMINAL
3. READ & RECORD MEASURED POTENTIAL

C.P TESTING - PERMANENT REFERENCE CELL

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Permanent Reference Electrode

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0.850 V

PIPE

0.850 V

PIPE

C.P TESTING - PORTABLE REFERENCE CELL

1. CONNECT (+) LEAD OF VOLT METER TO STRUCTURE TERMINAL
2. CONNECT (-) LEAD OF VOLT METER TO REFERENCE CELL TERMINAL
3. PLACE REFERENCE CELL DIRECTLY OVER OR ADJACENT TO PIPE
4. READ & RECORD MEASURED POTENTIAL

VOLT METER REFERENCE CELL C.P. TEST STATION STRUCTURE TERMINAL STRUCTURE TEST WIRE VOLT METER

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PROPER REFERENCE CELL PLACEMENT

PIPE GRADE

ANODE

.850V

ANODE

100' (TYPICAL)

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Coupon Test Station

IR Free Potential Reads
No Need to Interrupt:

Rectifiers Sacrificial Anodes Foreign Bonds

Calculate Metal Loss

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Remote Monitoring

GPS Controlled
Automatic Pipe‐to‐Soil

Potential Reads

Automatic Rectifier

Voltage & Amperage Reads

Alarm Notification
Interruption Capabilities
Cellular, Satellite &

Radio Communication

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Circuit Interruption

Rectifiers & Foreign

Bonds

Sacrificial Anodes
GPS Controlled
Programmable

Schedule

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Fault Protection & Grounding

Solid State
Induced AC Voltage

Mitigation

Stray DC Voltage

Blocking

Insulated Joint

Protection

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Ultrasonic Thickness (UT) Gauges

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Thermite Welding

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Over‐the‐Line Survey Techniques

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Over‐the‐Line Survey Techniques

Close Interval Survey (CIS)

Cathodic Protection Potential Profile

Pipeline Current Mapping (PCM)

Maps Cathodic Protection Current Loss due to Coating

Failure or Shorted conditions

Direct Current Voltage Gradient (DCVG) Alternating Current Voltage Gradient (ACVG)

Pinpoints Coating Defects

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