Guidance on Cathodic Protection Upgrade Procedures at Service Stations

In order to properly cathodically protect piping at service stations, the following must be checked:

1. Check isolation of the subpump at each tank.  Inside the subpump vault take a potential on both sides of the union.  If potentials are different isolation exists, if not there is a short.
2. Check isolation at the dispensers.  Open dispenser and take a potential on both sides of the union.  If there is as short, loosen support bracket to determine if short is being caused by this bracket.  If so try to provide some type of isolation by either relocating bracket or installing an isolating materials between the pipe and bracket.
3. Once isolation has been established, check potential levels on the piping to determine if these is sufficient protection.  Potentials over -.085 volt, if not connect an anode at each subpump areas on the pipe side of the union and recheck potentials  by the dispensers.  If more protection is required, then install anodes inside dispensers if possible.
4. If potential are not at an acceptable level or anode cannot be installed inside the dispensers, then anode will have to be installed along the piping run, or install impressed current system.
5. Install test stations with structure leads wherever possible.

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