JP2626953B2 - Metal tube corrosion inspection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal pipe corrosion inspection apparatus capable of quantitatively detecting the degree of corrosion of a piping system using a copper pipe or the like for water supply and hot water supply piping for building equipment.

[0002]

2. Description of the Related Art To measure the degree of corrosion of copper pipes, the inventor of the present invention has previously disclosed in Japanese Patent Application No. 60-86881 (Japanese Patent Application Laid-Open No. 61-245000) a copper pipe made of the same material. A corrosion monitoring method for incorporating a monitor tube, measuring the potential of the inner surface of the monitor tube, and detecting the degree of corrosion was invented and filed.

[0003] The monitor tube is incorporated in a copper piping system, but is removed from the piping system on a predetermined period of inspection, and is immersed in a container such as a polybucket filled with water taken out from the piping system. Then
The lead wire is connected to a tester, a saturated calomel electrode is connected to one pole of the tester, and the potential is measured as a reference electrode.

[0004] It is known that the corrosion of copper pipes is caused by an increase in potential due to oxides on the inner surface. Therefore, it is necessary to know whether a state causing pitting corrosion or a safe state is caused by the potential on the inner surface of the monitor pipe. it can.

[0005]

However, in such a so-called batch processing system in which a monitor tube is detached one by one and the reference potential (natural potential) is measured on an inspection day of a predetermined cycle, manual operation is required each time. At the same time, data can only be obtained in batches (intermittent).

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned disadvantages of the prior art and to measure the potential while keeping the water in a fluid state so that the tendency of corrosion can be determined continuously and the temporal change in water quality can be grasped. It is an object of the present invention to provide a corrosion inspection apparatus for a metal pipe.

[0007]

According to the present invention, in order to achieve the above object, an inspection box having a water inlet and a water outlet for the pipe is provided in the middle of the pipe, and the area around the water inlet is provided in the inspection box. Surround the lower end with a pipe of the same material as the main piping.
The metal tube to be inspected is detachably installed, the flowing water from the water inlet is passed through the metal tube to be inspected from below to above, discharged from the water outlet, and the electrode is inserted into the metal tube to be inspected in a non-contact manner. The gist of the invention is to measure the voltage between the metal tube to be inspected and to install a defoaming cell with an open upper surface on the inflow side of the inspection cell in the middle of the pipe.

[0008]

According to the first aspect of the present invention, the water flowing through the piping is water of the same quality as the water of the main piping system of the equipment, and this water flows from the piping through the water inlet into the metal pipe to be inspected from below. It flows upwards, exits the inspection box, and returns to the pipe from the water outlet. Then, the electrode is inserted into the tube to be inspected in a non-contact manner, the inside of the metal tube to be inspected is filled with running water, and the electrode is electrically connected to the outside of the tube in a state where water is arranged outside the tube. The potential inside the test tube can be measured.

As described above, the corrosion tendency is determined by measuring the potential of the surface of the metal tube which comes into contact with water, and the effect of the anticorrosion treatment is determined.
A maintenance schedule can be created.

The corrosion inspection will be further described.
In this case, the production time is the same,
And remove a part of the same product as the piping to
To reproduce the same corrosion state as piping.
Can be. That is, firstly the conductivity with the pipe was refused
Calculate the potential difference of the inspected metal tube only.
From the metal pipe to be inspected, and
The corrosion state of the piping and the entire piping can be estimated from the
You.

Further, by measuring the potential of the surface of the metal pipe, the influence of the water quality on the metal can be measured, and the change with time of the water quality can be comprehensively grasped.

The metal tube to be inspected can be easily replaced in a short time, and can be implemented with various kinds of target metals.

According to the second aspect of the present invention, in addition to the above operation, the micro air is removed by a defoaming cell in advance, so that the micro air existing in the water adheres to the surface of the detection electrode to generate a measurement error. No longer. As a result, the temperature difference between water and the atmosphere can be neglected, and sampling from the circulating water feed section becomes possible.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a longitudinal sectional side view showing one embodiment of a metal pipe corrosion inspection apparatus of the present invention, and FIG. 2 is a plan view of a main part.

In the figure, reference numeral 1 denotes a pipe, and joint flanges 2 for joining are provided at both ends of the pipe. Although not shown, the pipe 1 is installed in the middle of a bypass pipe or the like branched from the main pipe of the equipment. The same water and hot water as the main piping of the equipment shall be supplied. If the water pressure in the main piping is high, the pressure is released by an appropriate means before sending to the piping.

In the present invention, an inspection box 5 having a water inlet 3 and a water outlet 4 for the pipe 1 is provided in the middle of the pipe 1.
The inspection box 5 comprises a support plate 6 having the water inlet 3 and the water outlet 4 formed therein, and a tubular tank body 7 having a lower end fitted to the support plate 6 and an open upper end. An O-ring 8 is interposed at the joint between the tank 6 and the tank 7.

In the test box 5, a fitting groove 9 is provided around the water inlet 3 of the support board 6, an O-ring 8 is interposed in the fitting groove 9, and a metal tube to be tested as a sample tube is provided. Ten
The metal tube 10 to be inspected is set up in the inspection box 5 by detachably fitting the lower end of the metal tube. The inspection metal tube 10 is a tube of the same material and equipment present piping, and the like epoxy resins other-coated outer surfaces coated copper tube.

In the drawing, reference numeral 11 denotes a fixing plate which fits horizontally inside the tank body 7 and abuts on the upper end of the metal tube 10 to be inspected to fix it. Thus, the electrode potential of the metal tube 10 to be inspected can be measured. The surface other than the surface where the metal tube 10 to be inspected and the fixing plate 11 are in contact with each other must be insulating or electrochemically inert.

Further, an electrode tube 13 which is an Ag / AgCl reference electrode (or a saturated calomel electrode or the like) is inserted into the metal tube 10 to be inspected in a non-contact manner. This electrode tube 13 is a fixed plate
It is held by a non-conductive spacer pipe 14 that stands through the pipe 11. Although not shown, the electrode tube 13 connects the cable 12 and is connected to one pole of the tester.

In the middle of the pipe 1, on the inflow side of the inspection box 5,
A defoaming box 17 composed of a tubular tank body 15 having an open upper surface and a support board 16 into which the lower end of the tank body 15 is fitted is provided alongside the inspection box 5. An O-ring 8 was interposed at the joint with the support board 16.

[0021] Next, a description will be given to use. Hot water if Ku flows a pipe 1 is water in the water of the same quality of the piping system of equipment, the water is first passed through the Datsuawamasu 17, micro air present in the water in the de-Awamasu 17 removed Is done.

Then, the metal flows through the metal pipe 10 to be inspected from below through the water inlet 3, overflows from the upper end of the metal pipe 10 to the tank 7, and returns to the pipe 1 from the water outlet 4. In this way, the inside of the metal tube 10 to be inspected is filled with running water,
By connecting a potentiometer or a tester to the metal tube 10 to be inspected and the electrode tube 13 in a state in which water is also arranged inside and outside, the electric potential inside the metal tube 10 to be inspected can be measured.

It is known that corrosion of copper pipes and the like is caused by an increase in potential due to oxides on the inner surface.
It is possible to accurately know whether the pitting is caused or the state is safe by the potential of 10. Further, when the pitting potential is approached, a corrosion suppressing means such as charging an anticorrosive agent into the main piping of the equipment is taken.

In order to adjust the speed of flowing water in the metal pipe 10 to be inspected and the level of water accumulated in the tank 7, an adjusting valve may be provided at the water outlet 4 or in the vicinity thereof.

[0025]

As described above, the metal pipe corrosion inspection apparatus of the present invention determines the tendency of corrosion by measuring the potential of the surface of the metal pipe in contact with water, and determines the effect of the anticorrosion treatment. Water can be maintained in a fluid state, the properties of water can be maintained in a state close to the true state, and the potential can be continuously measured, whereby the corrosion tendency can be accurately detected without trouble.

[0026] and by such continuous inspection, to determine the durability of the equipment, exchange, it is possible to create a maintenance schedule.

Further, by measuring the potential of the surface of the metal tube, the influence of the water quality on the metal can be measured, and the change with time of the water quality can be comprehensively grasped.

The metal tube to be inspected can be easily exchanged in a short time, and has a high versatility that can be implemented with various kinds of target metals.

[Brief description of the drawings]

FIG. 1 is a vertical sectional side view showing one embodiment of a metal pipe corrosion inspection apparatus of the present invention.

FIG. 2 is a plan view of a main part showing an embodiment of a metal pipe corrosion inspection apparatus according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Piping 2 ... Joint flange 3 ... Water inlet 4 ... Outlet 5 ... Inspection box 6 ... Support board 7 ... Tank body 8 ... O-ring 9 ... Fitting groove 10 ... Metal pipe to be inspected 11 ... Fixing plate 12 ... Cable 13 ... Electrode tube 14 ... Spacer tube 15 ... Tank body 16 ... Support board 17 ... Defoaming box

 ────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-61-245000 (JP, A) JP-A-61-105400 (JP, A) JP-A-4-50600 (JP, A)

Claims (2)

(57) [Claims] 1. A test boxes having a water inlet and water outlet provided for the pipe in the middle pipe, the said inspection boxes, so as to surround said filling port at the lower end, of the same material and equipment present pipe tube
The metal pipe to be inspected is detachably installed, the flowing water from the water inlet is passed through the metal pipe to be inspected from below to above, discharged from the water outlet, and the electrodes are inserted into the metal pipe to be inspected in a non-contact manner. A corrosion inspection apparatus for a metal tube characterized by measuring a voltage between the metal tube and the metal tube to be inspected. 2. The metal pipe corrosion inspection apparatus according to claim 1, further comprising a defoaming box having an open upper surface provided on an inflow side of the inspection cell in the middle of the pipe.