CZ13053U1 - Device for mineralizing exposed surface of metal bearing devices - Google Patents

Description

The utility model relates to a new insulation repair solution by means of a device for mineralizing a exposed surface of metal storage devices, in particular steel pipes embedded in soil or water. It is suitable for both line and non-line installations that are provided with corrosion-resistant coatings, the damage of which requires expensive earthwork repairs.

BACKGROUND OF THE INVENTION

Many methods of repairing insulations of metal storage devices are known. All assume removal of soil at the point where the insulation needs to be repaired, including removal of coating residues. It is also known that the cathodic protective system creates, as a result of its process, conditions for gradual mineralization of the metal surface at the places where the protective coating has been damaged. This is used in practice by keeping the value of at least the minimum polarization potential permanently in the sections of the pipe with the damaged coating found. In practice, the presence of minerals at the metal boundary has been proven by cathodic protection of pipelines in areas with damaged insulation. If the insulation damage is only a few cm ² , the mineral layer formed can heal within a few months. However, major insulation damage cannot be removed by conventional cathodic protection.

The essence of the technical solution

These disadvantages of the prior art are eliminated by a device for the mineralization of the exposed surface of a metal storage device, to whose exposed places of the metal of the given storage device a suitable mineralization mixture and an electrode have been introduced in advance. consisting of a rod of length 500 to 800 mm with a diameter of 20 to 50 mm, the insulated conductor is electrically conductively connected and is connected to the positive pole of a direct current source, preferably a battery, the insulated conductor being electrically conductively connected from the negative pole and a cycler with a metal storage device, especially a steel pipe. A direct current, the magnitude of which is controlled and dosed by a control resistor and a cycler, flows from the anode surface forming the anode. The amount of current is primarily determined by the size of the exposed metal surface of the storage device found. It must allow the cations and anions contained in the treated mineralization mixture to move to the metal surface together with the [H ₃ O] ⁺ ions, creating the alkaline environment necessary for mineralization and preventing oxidation of the metal surface of the storage device. The utility model will be of considerable technical and economic benefit in ensuring the operation of metal bearing structures, especially insulated steel pipelines.

Picture in the drawing

The solution according to the utility model is explained in more detail in the accompanying drawing, in which Fig. 1 shows a schematic of a device for mineralizing a exposed surface of a metal storage device. Examples

The gas pipeline 1, made of welded steel pipes, provided with asphalt insulation 40, is interconnected by a cable 3 through a connecting object 4, in which it is conductively connected by a jumper 5 with a cycler 6, a regulating resistor 7 and a accumulator 8. with a metal electrode 9 forming an anode. The cathode gas pipeline 1 is embedded in a depth

0.8 mA is surrounded by soil with an apparent resistivity of 24.87 Ωιτι. A mineralization mixture consisting of 20 g of slaked lime, 50 g of crystalline CaHPO ₄ -2H2O and 200 g of sodium water glass was injected into the spot where the defect was found in the insulating coating of approximately 100 cm ² .

The anode 9 was made of cylindrical aluminum of 300 mm length and 20 mm diameter. The initial DC voltage of source 8 was 6.3 V and the polarization current was 15 mA. During 103 day polarization, the voltage stabilized at 3.2 V at a current of 2.1 raA. After this time, the originally found defect in the insulating coating was fully mineralized.

It follows from the described exemplary embodiment that the utility model can be used to remove damage to the insulating coating on virtually all buried pipes if they have continuous contact with the soil or are stored in water.

Industrial applicability

The equipment for mineralization of exposed surfaces of metal storage devices can be used in all cases where it is necessary to repair found damages of insulation systems, which have already exposed the metal surface and its contact with soil electrolyte, where it is still possible to remove found damages without . The utility model can be used for all water and gas pipelines, oil and other pipelines made of steel and insulated, as well as chemical and fuel tanks, including reinforced concrete foundations for bridges and buildings.

Claims (2)

PROTECTION REQUIREMENTS 1. Installations for the mineralization of the surface of exposed portions of metal storage devices, in particular steel pipelines (1), insulated (2), embedded in soil or water, into which 20 of the space at the site of the exposed metal surface was first introduced, in a sufficient amount corresponding to the size of the found exposed surface of the cathode-forming surface, a mixture of substances permitting mineralization, characterized by having an anode (9) consisting of at least one pointed metal cylinder mm, with a diameter of 20 to 50 mm, preferably made of aluminum, to which, on the other hand, a conductor is connected and insulated 25 with a positive pole of a direct current source, preferably an accumulator (8), the insulated conductor being electrically conductively connected via a control resistor (7) and a cycler (6) from the negative pole to the metal of the storage device, in particular a steel pipe (1). Device according to claim 1, characterized in that the accumulator (8), the control resistor (7) and the cycler (6) are attached to the upper, insulated part of the at least one electrode (9).