Ceranode Piggyback Anode System

Features:

· Discrete Concentric Arcs (loops)

· Each Arc Has Individual Redundant Leads

· Arcs Follow Tank Bottom Symmetry

· Optimized for Current

· Optimized for Tank Annular Plate & Rim Protection

· Optimized Current Efficiency

· Optimized for Minimum Anode Current Constriction Resistance

· Optimized for Low Groundbed resistance

· Arrives On-Site and Ready to Lay in Place

· Very Easy to Install

· 100% Factory Connections

· 50 Year Anode Design Life

· Low Cost

Tank Bottoms

The CerAnode PiggyBack Tank Bottom Anode System is ideal for new construction tank bottom and replacement bottom protection where space is limited due to a close proximity plastic secondary containment liner. In fulfilling its purpose the plastic liner not only isolates the tank bottom from its general environment to prevent the possible leak pollution, but it also isolates the tank bottom electrically from traditional remote cathodic protection currents. The PiggyBack Anode System, consisting of a series of concentric loops (arc) in a narrow plane between the tank bottom and plastic liner is the ideal CP solution. The loops are spaced 2 to 8 feet (normally 5 feet) to provide the desired current distribution and to optimize the anode "throwing power". The spacing is designed to compensate for distance available between the anode and the tank bottom.

Details of Anode Loop Pattern Under the Tank Bottom

Instead of being closed loops, the two ends of each loop (arc) are brought out to a terminal box providing redundant connections for every loop. Each loop can be operated independently or even electrically disconnected, if the need should ever arise, and the remaining portion of the system will continue to function as normal.

The first loop is concentric with the tank rim and equidistant from the rim. It is spaced at a distance from the rim of no more than half the general loop spacing to make a consistent amount of current available all around the rim where it is most important. Since this under-tank area at the tank rim is most susceptible to corrosion due to its close proximity to the atmospheric elements, this anode system allows for easy optimization of protection currents in this area by loop spacing adjustment. The anode-to-tank rim symmetry helps to ensure optimal current transfer.

Each concentric anode assembly loop consists of a standard 10 AWG high molecular weight (HMWPE) leader cable, or other cable choice, with a 3 mm diameter mixed metal oxide (MMO) anode wire mounted PiggyBack the entire length as seen below. The anode 3 mm diameter wire being continuous around each loop results in significantly more anode length of anode wire for given application resulting in extra low groundbed resistance and close to ideal current distribution.

Details of the PiggyBack Anode Loop Assembly

Note that the MMO Anode wire is connected to the header cable at preset intervals around the loop. The spacing of the connection intervals is determined by the mathematical relationship between the wire's electronic resistance and the electrolyte resistivity to approximate isometric current distribution from the anode.

In some re-bottoming applications where the anode will be installed within inches of the tank bottom, the PiggyBack Anode System is available with an integral plastic mesh sleeve around the header-anode wire assembly for added protection against possible anode wire to tank bottom shorts. In all situations the tank construction specification used by the tank contractor should be written with sufficient tutorial to properly educate the tank bottom contractor of the importance of maintaining the anode integrity during construction.