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Questions and Answers
What is the purpose of testing a cathodic protection system on an underground steel tank or gas piping?
Which instrument can be used to measure the tank-to-soil potential in a cathodic protection system?
Why is it important to test cathodic protection systems periodically according to NFPA codes?
What should you do if your cathodic protection test results are unsatisfactory?
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When should you consult with your supervisor regarding testing a cathodic protection system?
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Why do inadequate cathodic protection readings lead to a shorter life for an underground steel tank or gas piping system?
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When should the initial test of the cathodic protection system be completed?
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How often should follow-up testing be conducted for the cathodic protection system?
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What should be done if a cathodic protection system fails a test?
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How long should documentation of test results be retained?
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What is the purpose of a Portable Copper-Copper Sulfate Half Cell Reference Electrode?
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How should you prepare a Portable Copper-Copper Sulfate Half Cell Reference Electrode before use?
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Why is it important to avoid over-tightening the copper rod assembly back onto the tube of the Portable Copper-Copper Sulfate Half Cell Reference Electrode?
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What is recommended to remove if found damaged during inspection of the Portable Copper-Copper Sulfate Half Cell Reference Electrode?
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What is the purpose of letting the Portable Copper-Copper Sulfate Half Cell Reference Electrode sit for 24 hours after filling it with solution?
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Why should you clean out the Portable Copper-Copper Sulfate Half Cell Reference Electrode every two or three months under normal conditions?
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Study Notes
Initial Testing and Scheduling
- Initial testing must be completed after cathodic protection system installation, unless prohibited by extreme weather conditions.
- In cases of extreme weather, testing must be completed within 180 days of installation.
Follow-up Testing
- Conduct a follow-up test 12 to 18 months after the initial assessment.
- Periodic testing must be conducted at intervals of no more than 36 months.
Repair and Re-testing
- Systems that fail a test must be repaired promptly, unless climatic conditions prevent immediate action.
- In cases of delayed repair, repairs should be completed within 180 days.
- After repair, testing intervals begin again.
Documentation
- Retain documentation of the results from the two most recent tests to comply with the NFPA code.
- Follow company policy for documentation requirements.
Copper Half Cell Reference Electrodes
- Portable Copper-Copper Sulfate Half Cell Reference Electrodes consist of a plastic tube, copper rod, and copper sulfate solution.
- Inspect the copper rod to ensure it's smooth and shiny before use.
- Polish the copper rod with a non-metallic scouring pad or sandpaper to remove dirt or contaminants.
- Fill the tube with Copper Sulphate and distilled or deionized water, ensuring no crystals on the threads.
- Screw the plug assembly onto the tube end, being careful not to over-tighten.
- Let the electrode sit for 24 hours before using it.
Testing Piping Systems
- Testing a piping system is performed similarly to testing a container, with one or more test stations set up along the piping.
- For propane containers, access the anode connections inside the tank dome for testing.
Cathodic Protection System Testing
- Testing determines the level of corrosion protection on the system.
- Insufficient cathodic protection can lead to corrosion and shorter system life.
- Testing involves checking the tank-to-soil potential, which is a measurement of the voltage or stored energy surrounding the tank and its piping.
- NFPA codes require testing at the time of installation and periodically to ensure system protection.
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Description
Test your knowledge on the importance and methods of testing a cathodic protection system installed on underground steel propane tanks or metallic gas piping systems. Learn about the significance of determining corrosion protection levels and how to check tank-to-soil potential readings.
