SU1738873A1 - Device for measuring polarization potential of steel pipelines - Google Patents

Abstract

Use: control of the polarization potential for cathodic protection of metallic underground structures from corrosion, and can be used on structures that are not equipped with test points. SUMMARY OF THE INVENTION: The device is made in the form of a probe containing an aluminum pipe 2, at the lower end of which a copper sulphate reference electrode is located, above it is an insulated auxiliary electrode having a conical surface. Conductors 4 are led from the electrodes through a pipe to terminals end of pipe 2, under the handle. Increased accuracy is achieved due to the fact that the reference electrode and the auxiliary electrode are made in the form of a single design - a probe. 3 silt (Л С xj GJ 00 00 VI СО

Description

The invention relates to the control of the polarization potential of steel underground pipelines with electrochemical protection and can be used in determining the polarization potential in structures that are not equipped with special test and measurement points (I & C).

A device of a special measuring and measuring station is known, consisting of a reference electrode and an electrochemical potential sensor (auxiliary electrode), installed in a specially open hole 1.5-2 m deep in the immediate vicinity of the pipeline. The test leads are brought to the surface in a special column, after which the hole is filled up. The potential of the auxiliary electrode is measured at the moment it is disconnected from the pipeline.

The main disadvantage is the large amount of construction and installation work,

The closest to the technical essence of the invention is a device for measuring the polarization potential of pipelines, consisting of a portable electrode and a reference electrode. The device works as follows. A hole is made above the pipeline with a depth of 0.3-0.35 m, into which the auxiliary electrode and the reference electrode are placed and connected to a measurement circuit consisting of an interrupter and a voltmeter, after which the hole is filled and the potential of the auxiliary electrode is measured him from the pipeline.

A disadvantage of this device is the relatively large amount of work associated with the opening of the hole and the installation of electrodes, which reduces productivity in the production of works. In addition, the displacement of the soil at the measuring point reduces the accuracy of the measurement.

The aim of the invention is to improve the accuracy of measurements and reduce operating costs.

The goal is achieved in that in a device for measuring the polarization potential consisting in placing a reference electrode and an auxiliary electrode in a specially open hole, connecting them to a measurement circuit containing an interrupter and a voltmeter, filling the hole in the hole and measuring the potential of the auxiliary electrode at the moment it is disconnected from The facilities, the reference electrode and the auxiliary electrode are made as a single probe.

The probe body has a handle at the upper end and a plug made of insulating material with an axial cavity at the bottom. At the end of the cork mounted copper sulphate

reference electrode. The auxiliary electrode, made in the form of a conical ring, is mounted on the side surface of the tube and is separated from the reference electrode by a dielectric ring. Guides from

0 of the reference electrode and the auxiliary electrode are connected to the terminals located at the upper end of the probe under the handle. The hole for immersing the probe in the ground is made with a special steel rod 5 it.

FIG. 1 shows the probe, general view; in fig. 2 - rod; in fig. 3 shows the node I in FIG. 1. Core 1, made of 22-sided hexagonal steel bar,

0 is driven into the ground at a depth of 50-60 cm, turned with a wrench 2-3 turns and removed from the ground. A probe 2 is inserted into the hole formed. In this case, the reference electrode 3 is contacted with the ground at the bottom of the hole through the porous tip (Fig. 1), and the auxiliary electrode 5 (Fig. 3) is tightly in contact with the walls of the hole, pressing in in them. Auxiliary

0, the electrode 5 is insulated from the metal of the probe with a plug of insulating material 6, and from the electrode 3 is compared with a dielectric ring 7. The housing of the copper sulphate electrode 3 is made of Plexiglas. The connecting wires 8 from the copper rod 9 of the reference electrode 3 and the auxiliary electrode 5 are connected to terminals 10, to which a measuring circuit containing a breaker and a voltmeter is connected. For

0 convenience, the probe is equipped with a handle 11. The connecting wires are laid inside the aluminum pipe 12.

The economic effect is achieved due to the fact that the opening of a special hole is not required and the measurement procedure itself is reduced several times. In addition, the soil at the measurement site does not move, which improves the measurement accuracy.

Claims (1)

Invention Formula 0 A device for measuring the polarization potential of steel pipelines, comprising a reference electrode and an auxiliary electrode connected to a measurement circuit made in the form 5 an interrupter and a voltmeter, characterized in that, in order to increase measurement accuracy and reduce operating costs by performing a reference electrode and an auxiliary electrode as a single probe, it is provided with a housing with a handle in the upper end and a stopper made of insulating material with an axial cavity in the lower dielectric ring and two current terminals; the reference electrode is mounted on the end of the stopper; the auxiliary electrode is made in the form of a conical ring, mounted on the side the tube surface, the dielectric ring is fixed between the auxiliary electrode and the reference electrode, and the terminals are fixed on the side surface of the housing and each of them is connected to one of the electrodes and the measurement circuit. eight Fig.Z