CS211679B1 - Wrapped earthing anode for cathodic protection - Google Patents

Description

The invention relates to a packaged grounding anode for cathodic protection consisting of one or more electrodes, eg ferailite, embedded in a lining of an electrically conductive granular material, eg coke pea, connected by an insulated conductor to an external power source and a β vent pipe.

The most effective grounding anode so far consists of graphite or fersilitic electrodes embedded in a lining of electrically conductive granular material, which are housed in a metal sheath. The venting of gases from the space around the anode is provided by a perforated tube passing through the whole packed grounding anode.

As experience has shown, the disadvantage of placing the electrodes in a metal sheath. After corroding the metal sheath, a muddy sludge can enter the anode, resulting in insufficient evacuation of the gases around the anode, thereby reducing or malfunctioning the anode. Proper venting is not even possible due to pipe perforation, which facilitates the slurry penetration into the vent pipe.

These disadvantages are overcome by the packaged venting anode according to the invention, characterized in that the electrodes with the lining are placed in a sheath of compact porous mass, e.g. concrete of at least 2 cm thick, provided with a lid at the upper end which is sealed to the soil surface. drain pipe {? I

In particular, the advantage of the invention is the impossibility of penetrating the mud slurry to the individual electrodes, which ensures their permanent function. Also, the earth resistance of this packed anode cannot be increased. By preventing the slurry from penetrating, it is no longer necessary to insert the perforated tube to the bottom.

Compared with the prior art, when the perforated vent pipe has passed through the entire anode, resulting in a greater consumption of material with the necessity of its perforation for gas outlet, the solution according to the invention is both simpler and more reliable for drainage above the soil surface.

If the interior of the sheath is filled with at least 0.1% aqueous sodium chloride solution, the overall conductivity of the anode will increase.

An exemplary embodiment of a grounding anode according to the invention is shown in the drawing. Fersilite electrodes 1 are embedded in coke pea lining 2 and placed in a 10 m long concrete pipe 4 with a thickness of 4 cm. At the lower end, the pipe is closed by a concrete bottom A · The electrodes J are connected by insulated conductors g to an insulated lead-in cable 6, which is embedded in a plastic tube 2, sealed through an opening in the concrete cover 8.

Claims (2)

A packaged cathodic protection grounding anode consisting of one of it a plurality of electrodes, e.g. fersilites, embedded in a lining of an electrically conductive granular material, e.g. coke pea, - connected by an insulated conductor to an external power source and with a scraper tube, characterized in that the electrodes (1) with the lining (2) are housed in a sheath of compact porous mass, eg concrete at least 2 cm thick, a gas discharge pipe (7) is sealed to the soil surface (9) by means of a cover (8). AND. 2. The packaged earthing anode of claim 1, wherein the interior of the porous mass shell is filled with at least 0.1% aqueous sodium chloride solution;