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AMPP CP1 Theory Cheat Sheet

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Fundamentals of Corrosion

  • 30-40% of exam
  • Electrical Fundamentals Corrosion Cell CP Systems Ohm's Law Influencing Factors

Equipment and Equipment Management

  • 5-15% of exam
  • Meters Reference Cells Interrupters Locators Equipment Readiness

Installation and Field Measurement

  • 40-50% of exam
  • Potential Measurements Current Measurements Electrolyte Measurements Isolation Testing Installation Troubleshooting

Industry Practices and Requirements

  • 1-10% of exam
  • CP Criteria Recordkeeping Site Records Maps Instrument Identification

Safety

  • 1-10% of exam
  • Stop Work PPE LOTO Site Training Hazardous Materials

Quick Facts

  • Exam NACE-CP1-001
  • Identity CP1 Theory
  • Questions 100 total
  • Scored 81 questions
  • Unscored 19 pretest questions
  • Time 3 hours
  • Delivery Computer-based testing
  • Resources Limited onscreen PDF
  • Result Pass/fail
  • Certification Theory plus practical

Oxidation and Reduction FU

  • LEO at anode; GER at cathode
  • LEO: lose electrons oxidation GER: gain electrons reduction

Galvanic vs Impressed Current FU

Galvanic

  • Natural driving voltage
  • Consumable active anode
  • No external power

Impressed Current

  • External DC source
  • Rectifier drives current
  • Adjustable output
  • Natural drive vs powered drive

Electrical Fundamentals FU

  • Voltage Electrical driving force V
  • Current Charge flow rate A
  • Resistance Opposes current flow ohm
  • Ohm's Law V = I x R
  • Power P = E x I
  • Series circuit Current stays equal
  • Parallel circuit Voltage stays equal
  • KCL Current entering equals leaving

Circuit Constants FU

  • Series current same; parallel voltage same
  • Series: resistances add Parallel: currents add

Anode vs Cathode FU

Anode

  • Oxidation occurs
  • Electrons leave
  • Metal is consumed

Cathode

  • Reduction occurs
  • Electrons arrive
  • Metal is protected
  • Loss vs protection

Corrosion Cell FU

  • Anode Oxidation; metal loss
  • Cathode Reduction; protected site
  • Electrolyte Ionic current path
  • Metallic path Electronic current path
  • Oxidation Loses electrons
  • Reduction Gains electrons
  • Polarization Potential shifts under current
  • Shielding Blocks protective current

Series vs Parallel FU

Series

  • Current stays equal
  • Voltages add
  • Resistances add

Parallel

  • Voltage stays equal
  • Currents add
  • Reciprocals add
  • Same current vs same voltage

CP Systems FU

  • Galvanic CP Natural anode driving voltage
  • Impressed current External DC power
  • Rectifier Converts AC to DC
  • Galvanic anode Consumed to protect structure
  • ICCP anode Discharges rectifier current
  • Isolation Confines protective current
  • Coating Reduces current demand
  • Stray current Unintended current path

CSE vs Ag/AgCl EQ

CSE

  • Common soil reference
  • Copper sulfate electrolyte
  • Portable field use

Ag/AgCl

  • Common seawater reference
  • Chloride environment
  • Offshore drop-cell use
  • Soil reference vs seawater reference

Reference Picker EQ

  • Buried structure in soil → Portable CSE ( Prepare contact )
  • Submerged in seawater → Ag/AgCl reference ( Chloride environment )
  • Need fixed monitoring → Stationary reference ( Verify periodically )
  • Need rugged fixed cell → Zinc reference ( Document conversion )
  • Need comparative accuracy → Verified reference cell ( Check before use )
  • Reference appears unstable → Comparison cell ( Inspect contamination )

Meters and Tools EQ

  • Voltmeter Measures potential difference
  • Ohmmeter Measures resistance
  • Multimeter Combines electrical measurements
  • Ammeter Measures series current
  • Clamp-on ammeter Measures conductor current
  • Shunt Known low resistance
  • Interrupter Switches current sources
  • Pipe locator Finds buried structures

Reference Cells EQ

  • CSE Common soil reference 0.000 V vs CSE
  • Ag/AgCl 3.5% Common seawater reference -0.060 V vs CSE
  • Pure zinc Rugged stationary reference -1.100 V vs CSE
  • Portable reference Moves between readings
  • Stationary reference Remains at location
  • Porous plug Provides electrolyte contact
  • Cell check Compare before fieldwork
  • Cell record Document exact reference

Wenner Pin Roles FI

  • Outer pins current; inner pins voltage
  • Four equal spaces rho = 2 pi A R

On vs Instant-Off Potential FI

On

  • Current sources operating
  • Includes CP IR drop
  • Shows operating condition

Instant-Off

  • Sources briefly interrupted
  • Reduces CP IR drop
  • Approximates polarized potential
  • Operating reading vs polarized reading

Measurement Picker FI

  • Need structure potential → Voltmeter plus reference ( Record polarity )
  • Need shunt current → Millivoltmeter plus ratio ( Check direction )
  • Need conductor current → Clamp-on ammeter ( Verify DC capability )
  • Need soil resistivity → Wenner four-pin ( Equal spacing )
  • Need sample resistivity → Soil box ( Known geometry )
  • Need soil pH → Antimony plus CSE ( Compare potentials )
  • Need buried alignment → Pipe locator ( Conductive or inductive )
  • Need offshore potential → Ag/AgCl drop cell ( Record reference )

Potential Measurements FI

  • Structure potential Structure versus electrolyte
  • Native potential Before CP polarization
  • On potential Includes operating IR drop
  • Instant-off Reduces CP IR drop
  • Depolarized potential After polarization decays
  • IR drop Current times path resistance
  • Drop cell Offshore potential measurement
  • CP coupon Simulates coating holiday

Resistance vs Resistivity FI

Resistance

  • Specific circuit opposition
  • Measured in ohms
  • Depends on geometry

Resistivity

  • Material property
  • Includes length-area normalization
  • Wenner measures soil
  • Circuit value vs material property

Field Diagnostic Picker FI

  • Need polarized potential → Synchronized interrupters ( Capture instant-off )
  • Cannot interrupt sources → CP coupon ( Disconnect briefly )
  • Suspect isolation failure → Electronic isolator ( Confirm comparison )
  • Suspect metallic short → Potential plus current tracing ( Follow current )
  • Check rectifier output → External calibrated meter ( Compare panel meters )
  • Check galvanic anode → Current plus open potential ( Verify both )
  • Suspect broken test lead → Ohmmeter continuity test ( Follow safe procedure )

Current Measurements FI

  • Shunt current I = millivolts x ratio
  • Current direction Read meter polarity
  • Bond current Measure magnitude and direction
  • Rectifier voltage Verify externally
  • Rectifier current Verify through output shunt
  • Line current I = K x V
  • Calibration factor K = test current/deltaV
  • Anode current Confirms current delivery

Electrolyte Measurements FI

  • Wenner method Four equally spaced pins
  • Wenner formula rho = 2 pi A R
  • Outer pins Inject test current
  • Inner pins Measure voltage response
  • Soil box Tests collected sample
  • Collins rod Single-point resistivity
  • Pouillet's Law rho = R A/L
  • Antimony half-cell Compares soil pH

Locating and Isolation FI

  • Conductive locating Direct signal connection
  • Inductive locating No direct connection
  • Isolation device Separates metallic paths
  • Potential comparison Screens isolation effectiveness
  • Electronic isolator Verifies isolation device
  • Jumper bond Temporarily bridges isolation
  • Continuity test Checks metallic connection
  • AC mitigation Controls induced voltage

Installation FI

  • Surface preparation Ensures sound connection
  • Exothermic weld Attaches test lead
  • Pin brazing Alternative lead attachment
  • Test station Provides measurement access
  • mV-drop leads Enable line-current testing
  • Foreign crossing leads Enable interference checks
  • Permanent reference Install then verify periodically
  • Lead splice Restore electrical continuity

Basic Troubleshooting FI

  • Galvanic anode Check current output
  • Anode potential Measure open-circuit value
  • ICCP anode Check individual current
  • Metallic short Compare structure potentials
  • Current trace Locates short path
  • Diode Verify one-way operation
  • Internal meter Compare external reading
  • Unexpected reading Verify setup first

Field Record IN

  • Record what, where, when, how
  • Site conditions Instrument identity Method and reading

Theory vs Practical Exam IN

Theory

  • NACE-CP1-001
  • CBT question exam
  • 100 questions; three hours

Practical

  • Separate core exam
  • Hands-on assessment
  • Course conclusion
  • Current sheet covers Theory

Records and Practice IN

  • CP criteria Use governing requirements
  • Ethical records Accurate and complete
  • Personal logbook Retain field notes
  • System maps Confirm testing locations
  • Site record Date time conditions location
  • Instrument record Name model serial
  • Abnormal station Document unusual configuration
  • Facility records Maintain required history

Safety Controls SA

  • Site procedures Find before work
  • Safety officer Know responsible role
  • Work permit Acquire required authorization
  • PPE Match site hazards
  • Stop-work Pause unsafe task
  • LOTO Control hazardous energy
  • SDS Follow handling guidance
  • AC voltage Recognize corrosion and shock
  • Medical condition Communicate relevant risk
  • Site training Match task environment

Common Traps

Theory vs certification

  • Theory is one core exam ≠ Certification also requires practical

On vs polarized

  • On includes CP IR drop ≠ Instant-off reduces CP IR drop

Electrons vs conventional current

  • Electron flow follows electrons ≠ Conventional current runs opposite

Voltage vs current

  • Voltmeter connects across ≠ Ammeter enters current path

Magnitude vs direction

  • Shunt ratio gives magnitude ≠ Meter polarity gives direction

Portable vs stationary reference

  • Portable moves between sites ≠ Stationary remains installed

Course vs credential

  • Course completion alone insufficient ≠ All requirements earn certification

Last Minute

  • 1. Confirm NACE-CP1-001 Theory identity
  • 2. Remember 100 total; 81 scored
  • 3. Budget three CBT hours
  • 4. Treat every item as scored
  • 5. Match all five domain ranges
  • 6. Use provided reference PDF
  • 7. Bring no personal calculator
  • 8. Know Ohm and Wenner formulas
  • 9. Choose reference by environment
  • 10. Separate on from instant-off
  • 11. Check shunt ratio and polarity
  • 12. Record instrument identification
  • 13. Stop work for hazards
  • 14. Certification also requires practical exam

AMPP CP1 Cathodic Protection Tester

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