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CORROSION PROTECTION SYSTEMS Underground Fuel Tanks ... · CORROSION PROTECTION SYSTEMS Underground...
Transcript of CORROSION PROTECTION SYSTEMS Underground Fuel Tanks ... · CORROSION PROTECTION SYSTEMS Underground...
GTEC 2016 Fall Compliance Conference
CORROSION PROTECTION SYSTEMS
Underground Fuel Tanks & Piping
Owner Monitoring & Maintenance
Requirements
Presented by:
Ralph Eichlin
NACE Certified Cathodic Protection Specialist
Types of Corrosion Protection
• Coatings and Linings
• Cathodic protection
Types of Cathodic Protection Systems
• Galvanic
• Impressed Current
INTERNAL LINING STRUCTURES
• Steel tanks internally lined before
December 22, 1988.
GALVANIC SYSTEM STRUCTURES
• sti P3 ® Tanks
• Steel Product Lines With Galvanic
Anodes
• Steel Flex Connectors/Swing Joints
• STI P3 is a registered trademark of the Steel Tank Institue
GALVANIC CATHODIC PROTECTION
• Monitoring Requirements
• Federal EPA – Every 3 Year Test
• Georgia EPD – Every 3 Year Test
GALVANIC Monitoring Requirements
• An evaluation of the cathodic protection
system must be conducted by a certified
tester every 3 years.
• The tester must be certified by NACE,
GTEC or other recognized trade
organization.
GALVANIC SURVEYS
• Field tests must include:
• Verification of tank and piping materials
• Local and remote potential measurements
• Diagram of CP and fueling systems
• Test results must be presented on the
Georgia EPD form
GALVANIC CATHODIC PROTECTION
• Test results show the tanks and/or
piping do not meet criteria. Why?
• Poor coating
• Electrically grounded
• Tie down straps
• Electrical conduits
• Type of backfill – pea gravel vs. sand
GALVANIC CATHODIC PROTECTION
• What to do about non-compliance?
• 60 days to repair from date of test
• Tester to conduct trouble shooting and/or
current requirement tests
• Clear ground contact
• Add galvanic anodes or impressed current
• Re-test within 6 months of repair
Tank
Lifting Lug
Native
Soil
Galvanic
Anode
Fill
Pavement
IMPRESSED CURRENT
• Monitoring Requirements
• Rectifier Monitoring
• Can be conducted by owner/operator
• Federal EPA – 60 Days
• Georgia EPD – 60 Days
MONTHLY RECTIFIER MONITORING
Amps
Volts
• Record volts and amps
on form
• Compare output
readings to target
levels
• Take action if readings
do not fall within target
Remote Monitoring Unit (RMU)
IMPRESSED CURRENT
• Problems at Monthly Rectifier Monitoring
• No volts or amps
• Check breakers and fuse
• Volts but no amps
• Damaged cables
• Fuse blows every time
• Lightning damage to diode
• 60 days to repair
IMPRESSED CURRENT
• 3 Year Surveys
• Must use certified tester
• Tester must do a complete test with remote
and local potentials
• Results must be issued on Georgia EPD
form
IMPRESSED CURRENT
• 3 Year Survey – What Causes Failing Results?
• Tester did not complete test
• Rectifier needs to be adjusted
• Cable has been cut
• Anodes depleted
• Cable connection to tank is loose
• Improper original design
IMPRESSED CURRENT
• 3 Year Test Failure – Return to Compliance
• Repairs must be made in 60 days
• Owner needs to be sure repairs are actually
required
• Owner needs to be involved in repairs, to be
sure workmanship is of good quality
• Expert must sign off on repairs
OWNERS RESPONSIBLITY
• Know CP monitoring
schedules
• Ensure testers are certified
(when required)
• Review survey results, and
take appropriate actions
• Be involved in providing
quality control on repairs
Internal Lining – Compliance
Summary
• What you must do to remain in
compliance
• Have a trained professional re-inspect the
lining every 5 years
• As of 2015, you must permanently close
tanks using internal lining as the sole
method of corrosion protection, if the
internal lining fails the periodic inspection
and cannot be repaired according to a
code of practice
Galvanic – Compliance Summary
• What you must do to remain in
compliance
• Have the CP system tested every 3 years
by a certified tester
• Repair the system within 60 days of a non-
compliance report
• Retest within 6 months of any repair to the
UST system
• Keep the last 2 test reports on file
Impressed Current – Compliance Summary
• What you must do to remain in
compliance
• Monitor the rectifier every 60 days, record
the output, and make repairs to ensure it
operates at the prescribed output.
• Have the CP system tested every 3 years
by a certified tester
• Repair the system within 60 days of a non-
compliance report or rectifier outage
• Retest within 6 months of a repair to the
UST system
Test Reports – Compliance Summary
• What you must do to remain in
compliance
• Keep records of at least the last 3 rectifier
inspections.
• Keep the last 2 test reports by your
certified testing technician