Product Catalog

LIDA® Wire Anodes

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LIDA® wire anodes are copper titanium wire with a mixed metal oxide coating.

The mixed metal oxide is a crystalline, electrically conductive coating that activates the titanium and enables it to function as an anode.  

LIDA® wire anodes are manufactured in two diameters: 1.5 mm and 3.0 mm.

When applied on titanium, the coating has an extremely low consumption rate (measured in terms of milligrams per year). As a result of this low consumption rate, the wire diameter remains nearly constant during the life of the anode.

The low consumption rate of the mixed metal oxide coating at the recommended operating current densities result in projected anode lifetimes of 15 to 20 years. Longer or shorter lifetimes may be obtained by varying the current output per foot per wire.

Anode Coating

The coating used on wire is suitable for most cathodic protection applications, but output varies with application. LIDA® mixed metal oxide coating demonstrates a very high chemical stability, even in environments with very low pH values. Unlike other impressed current anodes, the LIDA® coating is not affected by the generation of chlorine.

Lead Wire Connection

A typical connection between the LIDA® wire anode and a header cable, have been used successfully in canistered anodes for over 25 years.

Applications

  • Canistered anodes

  • Continuous horizontal groundbeds

  • Discontinuous horizontal groundbeds

  • Shallow vertical groundbeds

  • Deep anode groundbeds

  • Aboveground storage tanks

  • Underground storage tanks

  • Natural water

  • Electrical cable shielding

  • Water storage tanks

  • Water treatment equipment

Resistivity versus Length

Proper current distribution is an important factor in the design and proper use of an anode wire for each application. For example, if a wire voltage drop of 10% or less is desired for proper current distribution in 1000 ohm-cm water, anode segments of 45 feet should not be exceeded between electrical connections to a header cable with the 1.5 mm diameter wire. By comparison, use of the 3.0 mm diameter wire will permit the use of 110-foot segments while still allowing the desired 10% voltage drop. 

As with all electrical conductors, the operating temperature of the wire affects the resistance. The table below shows this effect by assuming the wire will operate at the temperature of the surrounding electrolyte. The change in resistivity also changes the maximum ampacity of the wire.

 Wire Size mm
 1.5  3.0
 Electrical RES.ohm/m@25 ̊C  0.0174  0.003
 Electrical RES.ohm/m@70 ̊C  0.0204  0.0035
 Max Wire Amperage @25 ̊C, Amps  21  36
 Max Wire Amperage @70 ̊C, Amps  7  12

Savings

In many cases, LIDA® mixed metal oxide wire anodes offer savings over competitive anodes on an installed cost basis. This is possible by balancing the high current density capability of mixed metal oxide coatings and the ability to tailor to desired lifetimes.

Flexibility of Use

LIDA® wire anodes can be used in a wide variety of cathodic protection applications. Their lightweight and malleability allow forming to complex configurations. The copper core provides high conductivity resulting in better current distribution along the entire length of the wire