Cathodic Protection Testing Quiz and Flashcards

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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?

To assess the color of the tank surface

To determine the level of corrosion protection provided by the system (correct)

To check the tank's weight

To measure the volume of gas in the tank

Which instrument can be used to measure the tank-to-soil potential in a cathodic protection system?

pH meter

Voltmeter and copper sulfate half cell reference electrode (correct)

Thermometer

Barometer

Why is it important to test cathodic protection systems periodically according to NFPA codes?

To measure the gas volume in the tank

To assess the color changes on the tank

To ensure ongoing protection against corrosion (correct)

To monitor the tank's weight

What should you do if your cathodic protection test results are unsatisfactory?

Troubleshoot and possibly retrofit the installation with corrective equipment Signup and view all the answers

When should you consult with your supervisor regarding testing a cathodic protection system?

Before attempting to test sacrificial anodes Signup and view all the answers

Why do inadequate cathodic protection readings lead to a shorter life for an underground steel tank or gas piping system?

Because insufficient protection may result in corrosion and damage over time Signup and view all the answers

When should the initial test of the cathodic protection system be completed?

Within 180 days of installation Signup and view all the answers

How often should follow-up testing be conducted for the cathodic protection system?

Every 12-18 months Signup and view all the answers

What should be done if a cathodic protection system fails a test?

Repair must be done promptly Signup and view all the answers

How long should documentation of test results be retained?

Results from the two most recent tests Signup and view all the answers

What is the purpose of a Portable Copper-Copper Sulfate Half Cell Reference Electrode?

To provide a reference potential for testing cathodic protection systems Signup and view all the answers

How should you prepare a Portable Copper-Copper Sulfate Half Cell Reference Electrode before use?

Use a non-metallic scouring pad to remove contaminants Signup and view all the answers

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?

To prevent leaks Signup and view all the answers

What is recommended to remove if found damaged during inspection of the Portable Copper-Copper Sulfate Half Cell Reference Electrode?

'Ceramic plug' inside the electrode Signup and view all the answers

What is the purpose of letting the Portable Copper-Copper Sulfate Half Cell Reference Electrode sit for 24 hours after filling it with solution?

To allow time for electrolyte absorption by the ceramic plug Signup and view all the answers

Why should you clean out the Portable Copper-Copper Sulfate Half Cell Reference Electrode every two or three months under normal conditions?

To ensure accurate readings over time Signup and view all the answers

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.

Cathodic Protection System Testing Quiz

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