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Streamline cathodic protection testing, documentation

May 22, 2023 By    

The National Fire Protection Association’s (NFPA) Liquefied Petroleum Gas Code 58 requires routine cathodic testing for underground propane tanks from 2011 and newer.

Are you aware of how to meet specific code requirements efficiently? Requirements vary depending on location, but what doesn’t change is the best way to document your testing data. Here are our suggestions when it comes to complying with NFPA 58 cathodic protection inspection requirements.

Step 1: Improve documentation accuracy and organization

Digital platforms can evaluate technician performance. (Photo: ipuwadol/iStock / Getty Images Plus/Getty Images)

Digital platforms can evaluate technician performance. (Photo: ipuwadol/iStock / Getty Images Plus/Getty Images)

Do you have initial testing and inspection forms for any employees who need them? Does your company have a process in place to ensure that periodic intervals are being addressed? There are a variety of different platforms out there; some people use paper forms, while others use a digital platform to store their documents safely and get reminders of periodic inspections.

Regardless of how you plan to document periodic inspections, make sure you choose something that works well for your company, your employees and your customers, along with meeting industry documentation standards. Your plan should also clearly define how your company performs such inspections.

Step 2: Know what’s required

NFPA 58 requirements include:

  • Cathodic protection must be at least -0.85 D.C. or more (meaning negative) using a copper-copper sulfate half cell.
  • Test must be completed upon installation unless prohibited by climatic conditions, in which case testing shall be done within 180 days after installation of the system.
  • For continued verification of the effectiveness of the system, retest 12 to 18 months after the initial test.
  • Systems failing a test shall be repaired as soon as practical unless climatic conditions prohibit this action, in which case the repair shall be made not more than 180 days thereafter. Testing schedule shall be restarted as required initially.
  • Periodic follow-up testing shall be performed at intervals not to exceed 36 months.
  • Documentation of the results of the two most recent tests shall be retained.

As inspections come in, digital platforms can evaluate technician performance. You’ll be able to view technician-specific data, identify any areas for improvement and provide customized coaching to reduce risk.

Step 3: Find a bulletproof way to track follow-up tests

Develop a plan to conduct required follow-up testing. And keep in mind – paper inspection forms stuffed in a filing cabinet have no way of letting you know when they’ve expired.

Digital documentation automatically flags inspections needing follow-up on your dashboard for management staff to see.

Using software to store, retrieve and track cathodic protection documentation makes this process more efficient for your safety management team. Plus, software can notify you immediately when corrective action is necessary.

Brent Cammett is the safety and compliance director at P3 Propane Safety. You can reach him at or

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