LIDA® Tubular Anodes

Lida Tubular Anode

LIDA® Tubular Anodes
LIDA® tubular anodes are titanium tubes with a mixed metal oxide coating. The mixed metal oxide is a crystalline, electrically-conductive coating that activates the titanium and enabling the tube to function as an anode.

The mixed metal oxide anode has an extremely low consumption rate, measured in terms of milligrams per ampere-year. As a result of this low consumption rate, the tubular dimensions remain nearly constant during the life of the anode - providing a consistently low resistance anode.

Whether operating in soil, freshwater, mud or sea water, LIDA® mixed metal oxide coatings demonstrate very high chemical stability - even in environments with very low pH values. Unlike other impressed current anodes, the LIDA® coatings are not affected by the generation of chlorine.

LIDA® Tubular Anode Features
  • Multi-anode conductor
  • Lightweight/durable
  • High current output
  • Patented crimp connections
  • Dimensionally stable
LIDA® Tubular Anode Benefits
  • Dramatically reduces cable costs
  • Reduces handling and installation costs
  • Lower cost per amp-hr
  • Guaranteed electrical contact and moisture seal integrity
  • Consistently low resistance anode

LIDA® Tubular Anode Reliability
In choosing the LIDA® tubular anode, you have selected the most durable and reliable product in the industry for your cathodic protection needs. LIDA® tubular anode strings are backed by a five-year, no hassle warranty.

Design, assembly and installation factors have been carefully considered so that your time and costs are minimized as much as possible.

LIDA® Tubular Anode Ease of Installation
The LIDA® anode-cable assemblies are easy to handle, transport and install because of their unique flexibility. It makes your job on-site easier as well.

LIDA® Tubular Anode Applications
  1. Groundbeds
    • Deep
    • Shallow Vertical
    • Horizontal
    • Open Hole
  2. Marine
    • Sea Water
    • Brackish Water
    • Mud
  3. Fresh Water

LIDA® Tubular Anode Strings
A LIDA® "anode string" is comprised of electrical cable threaded through one or more tubular anodes. Electrical connection between the anode and cable is via a patented, mechanical crimping process. The crimp connection is likewise utilized to seal the anode around the cable at both ends. Lida Ventralizer

Since only a single cable lead protrudes from the hole, the junction box is eliminated when using a LIDA®anode string - reducing the cost of materials and labor.

String assemblies are also available in a looped configuration with two tails, or as multiple, staggered strings for system redundancy and maximum current distribution throughout the groundbed.

Like any impressed current anode, proper groundbed design is paramount to optimum, low resistance performance. The use of quality, conductive, carbonaceous backfill, a vent pipe and Ventralizers, suitable cable, good design practices and understanding are all recommended.

The LIDA® Crimp
Many impressed current anodes are connected to the cable with resin-based seals which may develop cracks or lose adhesion to the cable or anode. Moisture penetration also may occur, resulting in loss of electrical contact.

LIDA® anodes are connected with a special crimping process which improves the life of the tubular anode system.

On the surface, the crimp on the ends and in the middle appear the same. Yet they serve different purposes and are made differently. The center crimp makes electrical contact with the cable while the end crimps form a moisture-resistant seal.

Lida Crimp End Seal Both ends of the tubular anode are sealed over the insulated cable by applying 50 tons of hydraulic pressure. This crimping process eliminates the need for mastic or resin sealants.

Lida Crimp End Seal Electrical connection between the tubular anode and the power cable wire is achieved by sliding the tube onto the cable and crimping a section of the tube at mid-length around a stripped portion of the cable.

LIDA® Tubular Anode Dimensions
Anode Diameter Length Weight Surface Area
  cm inches cm inches cm inches m2 ft2
2.5/50 2.5 1.00 50 19.7 0.14 0.31 0.039 0.42
2.5/100 2.5 1.00 100 39.4 0.28 0.62 0.079 0.84

In groundbed design, it is important to remember that the purpose of the tubular anode is to provide current to the coke breeze column. Good design of a groundbed begins with first sizing the diameter and depth of the coke breeze column (active depth).

Parameters important to consider in the design

Lida Ventralizer
For optimum performance, Ventralizers™ should be used to assure that the tubular anodes will be located in the center of the groundbed. The Ventralizer's unique design further allows the operator to attach the anode to the vent pipe - providing 1" of separation between the anode and vent pipe. Standard sizes are 6", 8" and 10", suitable for hole sizes ranging from 6" to 12".

Vent Pipes
Vent pipes should be used in all deep groundbeds. The importance of vent pipes includes.

It is important to keep the vent pipe clear. Therefore, hole or slit sizes should be smaller than the smallest particle size of the backfill to keep it from filling the vent pipe.

Selection and installation of a high-quality carbonaceous backfill is critical for proper performance of all types of groundbeds. Backfills should be pumped from the bottom of the hole and the fill pipe removed.

Backfills for LIDA® tubular anodes must have the following characteristics.
  Metallurgical Coke Petroleum Calcined Coke
Resistivity Max. 50 ohm-cm Max. 50 ohm-cm
Particle Size 0.1 - 3 mm (150-5 mesh) Min. 70%
Carbon Content 0.1 - 1mm (150-20 mesh) Min. 90%

Hole Drilling and Cleaning
In all groundbeds, regardless of anode types or bed geometry, the hole must be cleaned prior to installation of anodes, vent pipe and backfill. This prevents contamination of the backfill, which can cause high resistivity and short groundbed life.

Cable Selection
Where anodes operate in groundbeds high in chlorides - resulting in chlorine gas generation, it is recommended that dual-insulated cable, such as PVDF/HMWPE cable be used.

Where chlorides are not anticipated, such as shallow vertical and horizontal surface beds, an economical cable choice is HMWPE.

The high current capacity (150 amps) and flexibility of the Exane Rig cable makes it ideal for seawater applications.

LIDA® Tubular Anode Cable Recommendations
Type Wire Size Nominal Outer Jacket Inner Jacket Maximum
HMWPE #8 0.13 0.09 HMWPE none 27 Economical
#6 0.18 0.12 HMWPE none 50
PVDF/HMWPE #8 0.13 0.09 HMWPE none 27 Chlorine resistant
#6 0.18 0.12 HMWPE none 50
Exane Rig
4/0 0.90 0.61 Exane
none 560 Highly

LIDA® Tubular Anode Current vs. Life Charts
Lida Tubular anode chart key

Lida Tubular anode chart Lida Tubular anode chart Lida Tubular anode chart Lida Tubular anode chart Lida Tubular anode chart Lida Tubular anode chart