JPH09111480A - Electrolytic protection device for inside surface of steel tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to constitute the electrolytic protection device for the inside surface of a steel tank with simple work by projecting a mounting fitting having a U-shaped clamp from a short columnar anodic body and fixing a bottom longitudinal by means of a lock bolt to this clamp. SOLUTION: The one end face of the short columnar anodic body 1 is projectingly provided with the U-shaped clamp 2a. This U-shaped clamp 2a is inserted from the drain hole 3a of the bottom longitudinal 3 to the bottom longitudinal surface. The bottom longitudinal 3 is then fastened to the other clamping plate surface of the U-shaped clamp 2a via a locking nut 2b by the lock bolt 2c disposed at the one clamp plate surface of the U-shaped clamp 2a, by which the galvanic anode body 1 is conducted and fixed to the bottom longitudinal 3. As a result, the fixing work is extremely easily carried out.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a cathodic protection device for an inner bottom plate of a steel tank such as a crude oil storage tank or a tanker.

[0002]

2. Description of the Related Art Conventionally, a cathodic protection device for the inner surface of a steel tank is formed by a main body of a galvanic anode having a rectangular cross section having a required length, and cast in the longitudinal direction of the main body of the galvanic anode. Core bar, mounting leg plates vertically protruding from both ends of the core bar to the outside of the lower surface of the galvanic anode body, and welding provided at right angles to the lower half of one side end face of each mounting leg plate. The welding plate was welded to the bottom long surface of the steel tank (see Japanese Utility Model Publication No. 4-41180).

[0003]

By the way, since the conventional galvanic anode body is heavy, the workability of carrying it in is poor, and the welding plate is welded to the bottom long surface, so that the galvanic anode body is fixed. However, there is a problem in that it requires time and labor to repair the burned portion of the coating film.

[0004]

DISCLOSURE OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and the gist of the present invention is to integrally cast a short column type galvanic anode body. Rare,
The U-shaped clamp of a mounting bracket having a U-shaped clamp, a part of which protrudes from the galvanic anode main body, has a U-shaped clamp at the end of the protruding portion, and has a tightening bolt screwed through one clamp plate surface of the U-shaped clamp. Is sandwiched from the drain hole of the bottom longe in the steel tank to the bottom longe surface, and the tightening bolt is tightened so that the galvanic anode main body is electrically conductively fixed to the bottom longe.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a partially longitudinal side view showing an example of an embodiment of the present invention, and FIG. 2 is a partially transverse sectional plan view of FIG. 1 and is shown in FIGS. As described above, a short-cylindrical galvanic anode body 1 and one half are integrally cast into the galvanic anode body 1, and the other half projects from the other end surface of the galvanic anode body 1 and the other half ends. In addition to being equipped with a U-shaped clamp 2a,
An electro-corrosion protection device is constituted by one clamp plate surface of the U-shaped clamp 2a and a mounting bracket 2 having a tightening bolt 2c screwed through a locking nut 2b.

The U-shaped clamp of the mounting bracket 2
2a is the drain hole 3a of the bottom longe 3 in the steel tank
From the bottom to the bottom longe 3 surface, the tightening bolt 2c is tightened, and the loosening prevention nut 2b is tightened to electrically connect and fix the galvanic anode body 1 to the bottom longe 3. The galvanic anode body 1 may be of a short prism shape, and one half of the fitting 2 integrally cast into the galvanic anode body 1 is a so-called so-called galvanic anode body 1. It is used as a core metal.

By the way, the volume of one of the short cylindrical galvanic anode main bodies (same for short prismatic ones) 1 is 0.3 m ³ ,
The weight is 2.1 kg, and the area where cathodic protection can be performed on the inner surface of the steel tank for each galvanic anode body 1 is 10 m ² . The volume of each conventional galvanic anode body was 1.4 m ³ , the weight was 10 kg, and the area capable of cathodic protection was 30 m ² . Therefore, the galvanic anode body 1 of the present invention is lightweight and has excellent workability.

[0008]

According to the above-described cathodic protection device of the present invention, since the short pole type galvanic anode main body is used, the galvanic anode main body having a rectangular cross section with a required length conventionally used. Since the weight is light, the workability of loading into the steel tank is good, and moreover, by sandwiching the U-shaped clamp of the mounting bracket from the drain hole of the bottom longe in the steel tank to the bottom longe surface, just tighten the tightening bolts. Since the main body of the galvanic anode can be fixed to the bottom long section by conduction, the work can be performed much easier than the conventional fixing work by welding, and there is no fear of burnout of the coating film by welding.

[Brief description of the drawings]

FIG. 1 is a partially longitudinal side view showing an example of an embodiment of the present invention.

FIG. 2 is a partial cross-sectional plan view of FIG.

[Explanation of symbols]

 1 ... Short cylinder type galvanic anode main body 2 ... Mounting bracket 2a ... U-shaped clamp 2b ... Locking nut 2c ... Clamping bolt 3 ... Bottom length 3a in steel tank ... Drain hole

Claims (1)

[Claims] 1. A short-column type galvanic anode main body integrally cast into the main body, a part of which projects from the galvanic anode main body, and a U-shaped clamp is provided at the end of the protruding portion. While sandwiching the U-shaped clamp of the mounting bracket having a tightening bolt screwed through one clamp plate surface from the drain hole of the bottom longe in the steel tank to the bottom longe surface, tighten the tightening bolt to remove the electric current. A cathodic protection device for the inner surface of a steel tank, characterized in that the anode body is fixedly connected to the bottom long section.