JPH0630851Y2 - Horizontal pipe cathodic protection - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a cathodic protection technology for horizontally laid pipes for flowing seawater, freshwater, and the like.

[Prior Art] In order to reliably prevent corrosion of a metal horizontal pipe, it has been conventionally performed to provide a corrosion protection electrode member such as a wire on the horizontal pipe to flow a corrosion protection current.

As shown in FIG. 4, as a conventional apparatus in which such wires and the like are installed in a pipe, an anticorrosion electrode wire 12 is inserted into a protective tube 13 and then the anticorrosion electrode wire 12 is inserted into the anticorrosion pipe 11. The holder 20 fixed to the inner surface of the pipe 11 is attached to the protective tube 13 at appropriate intervals to hold the anticorrosion electrode wire 12 in the protective tube 13 at the center of the pipe 11. Depending on the type, there are some that have a uniform anticorrosion effect.

In addition, in JP-A-60-228683, a flexible electrode (coil conductor or the like) is provided in a pipe as a countermeasure against interruption of the anticorrosion current between the pipes connected by a flange or the like.
Which is inserted into the pipe to electrically connect the pipes so as to pass an anticorrosion current. In Japanese Utility Model Laid-Open No. 56-111169, a specially shaped electrode is attached to the inner face of the pipe to protect the inner face of the pipe. Japanese Utility Model Application Laid-Open No. 56-111170 proposes that the above electrodes are connected to each other by a wire rope and installed in a tube.

[Problems to be Solved by the Invention] However, each of the above anticorrosion devices has the following drawbacks. That is, in the above device, since the anticorrosion electrode is close to the bottom of the pipe, the anticorrosion current easily flows only in the bottom of the pipe and is hard to flow in the upper part of the pipe. Therefore, a uniform anticorrosion effect cannot be obtained. In addition, since the protective tube is sunk at the bottom of the pipe, the flow is disturbed at the bottom of the pipe, and sand and sludge easily accumulate,
It may cause a pipe clogging.

In the above apparatus, the cage disturbs the flow in the pipe, particularly the flow at the bottom of the pipe, so that sand, sludge, and the like are easily deposited on the pipe bottom, and the pipe is easily clogged.

In the above device, it is difficult to dispose the electrode at the center of the pipe, and it is difficult to obtain a uniform anticorrosion effect.

In the above apparatus, since the electrode is fixed to the bottom of the pipe, foreign matters are likely to collect on the bottom of the pipe, and it is difficult to remove the foreign matter once accumulated.

In the above device, it is difficult to dispose the electrode at the center of the pipe, and when it is fixed to the pipe bottom, foreign matter is likely to accumulate at the pipe bottom for the above reason.

Therefore, the main object of the present invention is to provide an anticorrosion device that holds the anticorrosion electrode in the center of the pipe to obtain a uniform anticorrosion effect, does not disturb the flow at the bottom of the pipe, and does not cause clogging of the pipe. .

[Means for Solving the Problems] The present invention for solving the above problems is directed to an apparatus for inserting an anticorrosion electrode member into a horizontal pipe for flowing a conductive fluid, and energizing the device to electrically corrode the horizontal pipe. In the third aspect, the anticorrosion electrode member is floated by a float provided inside the horizontal pipe, and the anticorrosion electrode member is disposed substantially at the center position of the horizontal pipe.

[Operation] In the present invention, since the anticorrosion electrode member is held by the float, (a) the electrode can be stably arranged at the center of the pipe, which allows a uniform anticorrosion current to flow, resulting in effective anticorrosion. It can be performed. Further, (b) there is no object that disturbs the flow of fluid at the pipe bottom, so there is no room for sand or sludge to accumulate on the pipe bottom, and pipe clogging can be prevented.

[Example] Next, the effect of the present invention will be clarified by showing an example.

In FIG. 1, reference numeral 1 is a pipe (for example, a cooling pipe for cooling the bottom of a blast furnace) to be subjected to cathodic protection, and a conductive liquid (not shown) such as seawater flows in the pipe 1. . Reference numeral 2 is an electrode wire for cathodic protection, which is inserted into a protective tube 3 which is usually made of an electrical insulator and inserted through the pipe 1. Reference numeral 4 is a rectifier that rectifies a current from an AC power supply (not shown), and has its plus wire terminal connected to the end of the electrode wire 2 and its minus wire terminal connected to the pipe 1. The other end of the electrode wire 2 is fixed to the electrode wire fixing rod 5. Reference numeral 6 denotes a float made of an electrical insulator, which is fixed to the protective tube 3 by a suspension wire 7 made of an electrical insulator.

The float 6 has a sufficient buoyancy to hold the electrode wire 2 and the protective tube 3 in the liquid in the pipe 1.
Further, the specific gravity of the electrode wire 2 and the protective tube 3 is selected to be larger than the specific gravity of the liquid in the pipe 1. Further, the length of the suspension wire 7 is set so that the electrode wire 2 is arranged at the central position of the pipe 1. By doing so, the electrode wire 2 can be stably hung from the float 6 on the axial center line of the pipe.

Further, the floats 6 are attached at appropriate intervals in the axial direction of the electrode wire 2 and are mounted in an appropriate number according to the length of the pipe to be subjected to cathodic protection. This is because the electrode wire 2 is always on the center line of the pipe 1 in the axial direction. As a result, the anticorrosion current flows evenly on the inner surface of the pipe 1 in the axial direction, so that the inside of the pipe 1 can be uniformly galvanically protected.

Furthermore, since there is nothing that hinders the flow near the bottom of the pipe 1, accumulation of sand, sludge, etc. does not occur.

2 and 3 show another embodiment of the present invention. The former is one in which the float 6 is directly fixed to the protective tube 3 by the fixing line 8, and the latter is in the float 4 in the protective tube. 3, the float 6 and the protective tube 3 are integrally fixed.

With the configuration shown in FIG. 2 or 3, the protective tube 3, that is, the electrode wire 2 can be arranged on the center line of the pipe 1 in a more stable state, and more uniform galvanic protection is performed. be able to.

The material of the float that can be used in the present invention is a hollow resin or the like, and examples thereof include expanded polystyrene.

[Advantage of Device] As described above, according to the present invention, the anticorrosion electrode is held at the center of the pipe to obtain a uniform anticorrosion effect, and the flow at the bottom of the pipe is not disturbed, and the pipe is not clogged. An anticorrosion device can be provided.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention, FIGS. 2 and 3 are sectional views showing other embodiments, and FIGS. 4 and 5 are sectional views showing a conventional device. (A), (b) in the figure
FIG. 3 is a cross-sectional view in the width direction and the axial direction of the pipe, respectively. 1, 11 ... Corrosion-protected pipes, 2, 12 ... Corrosion-proof electrode wires, 3,
13 …… Protection tube, 4,14 …… Rectifier, 6 …… Floater, 7 ……
Suspension line, 8 ... Fixed line, 20 ... Cage.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-51-66513 (JP, A)

Claims (1)

[Scope of utility model registration request] 1. An apparatus for inserting an anticorrosion electrode member into a horizontal pipe for flowing a conductive fluid, and energizing the horizontal pipe to cause the anticorrosion of the horizontal pipe, wherein the anticorrosion electrode member is floated by a float provided inside the horizontal pipe. And an anticorrosion device for a horizontal pipe, wherein the anticorrosion electrode member is disposed substantially at the center of the horizontal pipe.