Uniform Cathodic Protection Systems Based on AnodeFlex Electrodes

Traditional anodes employed in the cathodic protection of pipelines may led to one or more serious problems, such as lack of uniform distribution of the protective voltage along the length of the pipe.

In order to create enough protective voltage, the cathodic protection current must be increased, which leads to the increased danger of cathodic disbondment of the coating and to the electrolysis of ground water culminating in the formation of hydrogen gas.

With traditional cathodic protection systems, the anodes must be placed quite far from the pipe surface and their effectiveness can be harmed by metal structures and stray currents in the vicinity of the pipeline.

A solution to this problem is the use of AnodeFlex long, cable-like anodes laid in immediate proximity to the pipe along its full length.

The AnodeFlex system decreases the number of connection points to the pipe by approximately ten times.

The current which provides the cathodic protection, in this case, flows without significant loss through the central copper conductor, which is covered with a protective layer of conductive polymer. The necessary current for cathodic protection is created between the layer of this protective polymer and the body of the pipe and always ranges from -850mv to 1200mv with a protective current of up to 52mA/m.

Cathodic protection is distributed uniformly along the entire length of the pipe.

In areas where the coating system has failed the use of AnodeFlex can be a reliable alternative to complete coating rehabilitation

Tank bottoms can also be protected using AnodeFlex systems.

AnodeFlex cable

Simplicity of installation of AnodeFlex 1500 is a significant advantage of this electrode – it is supplied on reels in about 500m lengths and requires no additional components for mechanical protection or carbon fillers. AnodeFlex cable is installed in exactly the same manner as underground low-voltage power cable.

A team laying AnodeFlex 1500 can cover up to 2km a day without undue pressure.

  • AnodeFlex 1500 measures 38mm in diameter and weight 1.5kg/m.
  • Moreover it can be reliably installed at temperatures down to 15оС.
  • The bend radius should be greater than 0.5m.

installation of AnodFlex

The cable anode AnodeFlex 500 comes with no low-resistance carbon powder jacket. This anode should be installed in the centre of a shallow, open-earth trench that has been filled with carbon powder with a cross-section of 10 x 10cm. The anode and carbon powder can be buried using a standard cable laying system.

AnodeFlex 500 measures 13mm in diameter and weights 0.26kg/m. It is supplied on reels of up to 600m in length.

If erosion and leaching of carbon powder from the ditch cannot be stopped, then AnodeFlex 1500 is the preferred solution.

Included in the AnodeFlex system, apart from the anodes themselves, are end-caps, hermetically sealing cable ends, tee-joints, and also kits to splice and complete joints in the field.

Special software has been developed to calculate the distance between protection points, the distance of the anode from the pipe, the voltage of the cathodic protection power source and the amount of current to be put out by the power source. This program can be used to calculate the cathodic protection both for pipelines and tanks.