CORROSION Protection

1
CORROSION Protection

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• Alaska
• Spring 2004

2
Goals

• Ensure tank and piping are safe from corrosion
• Only applies to the portion of the UST system
  that routinely contains product. Tank and product
  piping only.

3
First step for Operator

• Figure out the construction material
• Tank
• Piping
• Figure out cathodic protection option
• Fiberglass or non-metallic
• Galvanic
• Impressed current

4
If non-metallic

• Confirm through documentation for inspector.
• Thats it.

5
If Galvanic

• Provide inspector with any previous test results
  Look for them in your previous inspection
  report.
• Have a cathodic protection test done if more than
  3 years since last test.
• Keep track of test results
• So long as there is enough cathodic protection,
  nothing more to do

6
Impressed Current Rectifier
7
If Impressed Current

• Find your 60 day rectifier log or start one.
• Provide inspector with any previous test results
  and 60 day rectifier log.
• Have a cathodic protection test done if more than
  3 years since last test or as recommended by a
  Corrosion Expert.
• Have rectifier checked and serviced, as needed.
• Keep track of test records

8
Tank lining

• Not common
• No further testing so long as cathodic protection
  present and maintained
• Studies of liner failures are starting to come in.