Waterworks: Aboveground Storage
The Corrpro/WRA Tank Mean Time to Corrosion Failure (MTCF™) program provides tank owners with a cost-effective means of minimizing the risk of leaks and of meeting regulatory requirements.
The Corrpro/WRA MTCF™ program of selected tank replacement and upgrading allows the tank manager to plan and budget for activities to minimize exposure to risk and meet regulatory requirements. Corrpro and WRA have developed procedures to:
- Provide the tank manager with definitive information based upon field corrosion engineering tests
- Enable the tank manager to prioritize tank replacement and upgrading activities in descending order of risk
- Protect good tankage with cathodic protection and tank lining retrofit programs
The Corrpro/WRA MTCF™ program is based on proven procedures that allow tank managers to plan, program and budget for tank integrity. It is a proactive means to identify requirements for upgrade and replacement to meet current applicable Federal (EPA) requirements
The rate of corrosion is a function of the characteristics of the backfill in which the tank system is installed. These include the resistivity, PH, electrical potential, moisture, chlorides, sulfides and stray DC. When taken alone, none of these characteristics when incorporated in a multi-variate statistical model were adequate for predictive purposes. However, a reliable means of predicting the rate of corrosion was developed. Using this model, the mean time to corrosion failure (MTCF) and probabilities of a leak could be established.
Since the corrosive characteristics of backfill vary greatly, even within a small geographic area, predicting MTCF for USTs is a site-specific task. The formulation of a mean age to leak establishes a narrow range of useful ages in which the likelihood of failure rapidly increases.
Those responsible for underground tanks can benefit from the experience of major oil companies who have had tank management programs in place for nearly two decades. These companies have discovered that the cost of such a program can vary tremendously depending on the approach taken.
Corrpro and Warren Rogers Associates (WRA) joined forces over a decade ago to provide the most cost-effective tank integrity assessment technology called MTCF™ which has been implemented on a nationwide basis for major gasoline retailers, including Chevron-USA, Texaco, Getty and Southland (7-Eleven). Corrpro/WRA's joint experience in evaluating more than 70,000 tanks at some 22,000 sites in North America is unmatched.