Laserfiche WebLink
In our previously mentioned report it was noted that the vent for the diesel tank was <br /> shorted to the building ground. Lodi City personnel corrected this problem by installing a <br /> dielectric material between the vent piping and the pipe clamps. Potentials values are now <br /> above proper levels of cathodic protection. It also appeared that the unleaded tank must <br /> have been connected to the diesel tank (i.e. electrical conduits). The potentials on the <br /> unleaded tank now meet or exceed proper levels of cathodic protection. Both tanks <br /> required only 0.015 amperes for complete cathodic protection. <br /> Municipal Service Center <br /> This location has four tanks and the sizes are as follows: <br /> • Diesel Tank, Approximately 5,000 gallons <br /> • Diesel Tank, Approximately 2,000 gallons <br /> • Unleaded Tank, Approximately 10,000 gallons <br /> • Waste Oil Tank, Approximately 2,000 gallons <br /> Only two of the four tanks did not meet criteria as derived from our initial survey. These <br /> were the two diesel tanks. Current requirement testing indicated these tanks would <br /> require 0.010 amperes of do current to achieve complete cathodic protection. By <br /> connecting the existing magnesium anodes the tanks can be brought to proper levels of <br /> cathodic protection. <br /> CONCLUSIONS <br /> 1. Each site as reported has supplemental anodes installed as part of the original <br /> design. Based on both theoretical and performed current testing the tanks at both <br /> location can be effectively protected against corrosion using the existing anodes <br /> which were at no time connected. <br /> 2. The diesel tank at the Public Safety Center has been sucessfully isolated by Lodi <br /> City personnel. <br /> 3. Both tanks at the Public Safety Center are now receiving an effective degree of <br /> corrosion mitigation and no additional CP improvements will be required at this <br /> time. <br /> RECOMMENDATIONS <br /> 1. Connect the existing anodes at all six tanks. This should be completed utilizing a <br /> micarda board and individual shunts to measure each anode current output <br /> (Figure 1). Each of the wires should be extended, such that the boards can be <br /> taken out of the tank pits for testing of the cathodic protection systems. <br /> Blackstone 2 <br /> Group <br /> Ltd. <br />