JPH0137480B2 - - Google Patents
Info
- Publication number
- JPH0137480B2 JPH0137480B2 JP56133642A JP13364281A JPH0137480B2 JP H0137480 B2 JPH0137480 B2 JP H0137480B2 JP 56133642 A JP56133642 A JP 56133642A JP 13364281 A JP13364281 A JP 13364281A JP H0137480 B2 JPH0137480 B2 JP H0137480B2
- Authority
- JP
- Japan
- Prior art keywords
- galvanic anode
- steel pipe
- corrosion
- pipe
- protected against
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000000034 method Methods 0.000 claims description 10
- 238000004210 cathodic protection Methods 0.000 claims description 8
- 238000009413 insulation Methods 0.000 claims description 7
- 238000004804 winding Methods 0.000 claims description 2
- 238000005260 corrosion Methods 0.000 description 17
- 229910000831 Steel Inorganic materials 0.000 description 16
- 239000010959 steel Substances 0.000 description 16
- 230000007797 corrosion Effects 0.000 description 15
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 238000005536 corrosion prevention Methods 0.000 description 3
- 229920003002 synthetic resin Polymers 0.000 description 3
- 239000000057 synthetic resin Substances 0.000 description 3
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Protection Of Pipes Against Damage, Friction, And Corrosion (AREA)
- Prevention Of Electric Corrosion (AREA)
Description
【発明の詳細な説明】
本発明は全系統の電気防食が困難な場合におけ
る配管の電気防食方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for cathodic protection of piping in cases where cathodic protection of the entire system is difficult.
土中または水中に埋設されたガス管または水道
管等の配管で全系統の電気防食を行なうことが困
難な場合がある。これはたとえぱ配管が他の構造
物と接触するなどの場合に生ずる。しかるに特に
裸金属管において腐食の危険性の大きい部分に対
しては、従来は第１図に示す如く電気防食を行な
つていた。 It may be difficult to perform cathodic protection for the entire system of piping, such as gas pipes or water pipes, that are buried underground or underwater. This occurs, for example, when piping comes into contact with other structures. However, as shown in FIG. 1, cathodic protection has conventionally been applied to parts of bare metal pipes where there is a high risk of corrosion.
第１図において土中に埋設された配管１と所定
間隔を隔てて柔軟性シート２により配管１を土壌
を含めて取り囲み、配管１と柔軟性シート２との
間に流電陽極３を設置し、流電陽極３と配管１と
を電気的にリード線４により接続して、防食する
とともに、他の構造物や配管の他の部分への防食
電流の分散を防止している。 In Fig. 1, a flexible sheet 2 surrounds the pipe 1, including the soil, at a predetermined distance from the pipe 1 buried in the soil, and a galvanic anode 3 is installed between the pipe 1 and the flexible sheet 2. The galvanic anode 3 and the piping 1 are electrically connected by a lead wire 4 to prevent corrosion and prevent the anti-corrosion current from dispersing to other structures or other parts of the piping.
しかるに上記した如き従来の防食方法によると
きは、防食工事が大掛りになり、配管円周の掘削
容積も大きく必要とする欠点があつた。またこの
ため防食工事に要する費用も高くなくなる欠点が
あつた。 However, when using the conventional corrosion prevention method as described above, the corrosion prevention work is large-scale and requires a large excavation volume around the circumference of the pipe. This also resulted in the disadvantage that the cost required for anti-corrosion work was not high.
本発明は上記にかんがみなされたもので上記の
欠点を解消し簡単な方法で防食をすることのでき
配管の電気防食方法を提供することを目的とする
ものである。 The present invention has been made in view of the above, and it is an object of the present invention to provide a method for cathodic protection of piping, which eliminates the above-mentioned drawbacks and can provide corrosion protection in a simple manner.
この目的は本発明によれば、外表面が絶縁被覆
された板状流電陽極を、防食対象管の外周に前記
板状流電陽極の内表面が当接するように巻回する
ことにより達成される。 According to the present invention, this object is achieved by winding a plate-shaped galvanic anode whose outer surface is coated with insulation so that the inner surface of the plate-shaped galvanic anode is in contact with the outer periphery of the pipe to be protected against corrosion. Ru.
以下、本発明方法を実施例により説明する。 The method of the present invention will be explained below using examples.
第２ａ図およびｂは本発明方法を適用した一実
施例の断面図および側面図である。 Figures 2a and 2b are a sectional view and a side view of an embodiment to which the method of the present invention is applied.
１１は防食対象配管としての裸鋼管であり、た
とえば土中に埋設されている。１２は外表面が絶
縁被覆されたたとえば板状亜鉛からなる流電陽極
である。絶縁被覆１３はたとれば合成樹脂シート
によるかまたは絶縁し塗料の焼付もしくは塗装に
より行なつてある。 Reference numeral 11 indicates a bare steel pipe as a pipe to be protected against corrosion, which is buried, for example, in the ground. Reference numeral 12 denotes a galvanic anode made of, for example, plate-shaped zinc and whose outer surface is coated with insulation. The insulating coating 13 is preferably made of a synthetic resin sheet or by baking or painting an insulating paint.
流電陽極１２はその内表面が裸鋼管１１に当接
して巻付、流電陽極１２の両端は合成樹脂で構成
したボルトおよびナツト１４で締付けて裸鋼管１
１に巻回定着する。 The galvanic anode 12 is wound around the bare steel pipe 11 with its inner surface in contact with the bare steel pipe 11, and both ends of the galvanic anode 12 are tightened with bolts and nuts 14 made of synthetic resin.
1 and fix it.
また尚、ボンドは鋼管と陽極との金属接触が必
然的に生ずるので特に必要としないし、鋼管と陽
極との対向面には陰イオンが拡散して腐食抑制効
果が期待出来るので原則的には必要はない。 Furthermore, bond is not particularly necessary since metal contact between the steel pipe and the anode inevitably occurs, and anions can be expected to diffuse into the facing surface of the steel pipe and the anode, which can suppress corrosion, so in principle, it is not necessary to use a bond. There's no need.
また、実験によつても裸鋼管１１と流電陽極１
２とを電気的に接続するボンドは省略しても防食
効果に孫色はないが必要に応じて流電陽極１２と
裸鋼管１１とは接続する。なお、１５はボンド線
である。 In addition, experiments also revealed that the bare steel pipe 11 and the galvanic anode 1
Even if the bond for electrically connecting the galvanic anode 12 and the bare steel pipe 11 is omitted, the anticorrosion effect will not be improved, but the galvanic anode 12 and the bare steel pipe 11 may be connected as necessary. Note that 15 is a bond line.
上記の如く構成することにより、裸鋼管１１の
被防食対象部は流電陽極１２により取り囲まれ、
流電陽極１２により裸鋼管１１の被防食対象部は
防食される。また流電陽極１２により裸鋼管１１
の被防食対象部は取りり囲まれており、流電陽極
の外表面は絶縁被覆されているため、防食電流の
被防食対象部への分散も防止される。 With the above configuration, the part of the bare steel pipe 11 to be protected against corrosion is surrounded by the galvanic anode 12,
The target portion of the bare steel pipe 11 is protected from corrosion by the galvanic anode 12 . In addition, the bare steel pipe 11 is
Since the part to be protected against corrosion is surrounded and the outer surface of the galvanic anode is coated with insulation, dispersion of the anticorrosion current to the part to be protected against corrosion is also prevented.
また、第２図に示した実施例は流電陽極１２の
端部で流電陽極に並びに絶縁被覆１３の端部を合
成樹脂製のボルト、ナツト１４にて定着して流電
陽極１２を裸鋼管１１に巻回定着させた場合を例
に設明したが、第３図に示す如く絶縁被覆１３の
端部を一部重複させて、その重複部を接着剤など
により固着することにより、流電陽極１２を裸鋼
管１１の外周に巻回定着してもよい。 In addition, in the embodiment shown in FIG. 2, the ends of the galvanic anode 12 and the ends of the insulating coating 13 are fixed with bolts and nuts 14 made of synthetic resin, so that the galvanic anode 12 is exposed. Although this design is based on the case where the steel pipe 11 is wound and fixed, as shown in Fig. 3, by partially overlapping the ends of the insulation coating 13 and fixing the overlapped part with adhesive, etc., it is possible to The electrode anode 12 may be wound and fixed around the outer circumference of the bare steel pipe 11.
また裸鋼管１１に代つて鋼管杭などの場合にも
適用できる。 It can also be applied to steel pipe piles instead of the bare steel pipe 11.
以上説明した如く本発明方法によれば、防食対
象管の外周に外表面を絶縁被覆された流電陽極を
巻回定着して電気防食するため、従来の如く掘削
溝に大きな柔軟性シートを挿入して防食対象管と
所定の間隔をおいて防食対象管を取り囲む必要は
なくなり、電気防食のために掘削溝の断面積を大
きくする必要はなくなつて、掘削溝の断面積は小
さくてすみ、電気防食工事を簡単に行なうことが
できる。 As explained above, according to the method of the present invention, a galvanic anode whose outer surface is coated with insulation is wound and fixed around the outer periphery of the pipe to be protected against corrosion, and a large flexible sheet is inserted into the excavated groove as in the conventional method. It is no longer necessary to surround the pipe to be protected against corrosion at a predetermined distance from the pipe to be protected against corrosion, and there is no need to increase the cross-sectional area of the excavated trench for cathodic protection. Electrolytic corrosion protection work can be easily performed.
また、流電陽極の内表面のみが防食のために作
用し、流電陽極の消耗量が少なくてすむ。また防
食電流が外部に拡散することがない。 In addition, only the inner surface of the galvanic anode acts for corrosion prevention, and the amount of wear of the galvanic anode can be reduced. Furthermore, the anticorrosion current does not diffuse to the outside.
またさらに防食対象管の素地調整をほとんど必
要としない。 Furthermore, there is almost no need to prepare the surface of the pipe to be protected against corrosion.
第１図は配管の従来における電気防食方法の説
明に供する断面図。第２図ａおよびｂは本発明方
法を適用した一実施例の断面図および側面図。第
３図は本発明方法を適用した一実施例の変形例を
示す断面図。
１１……裸鋼管、１２……流電陽極、１３……
絶縁被覆、１４……ボルト・ナツト。
FIG. 1 is a cross-sectional view for explaining a conventional cathodic protection method for piping. FIGS. 2a and 2b are a sectional view and a side view of an embodiment to which the method of the present invention is applied. FIG. 3 is a sectional view showing a modification of one embodiment to which the method of the present invention is applied. 11... Bare steel pipe, 12... Galvanic anode, 13...
Insulation coating, 14... Bolts and nuts.
Claims (1)
食対象管の外周に前記板状流電陽極の内表面が当
接するように巻回定着することにより前記防食対
象管を電気防食することを特徴とする配管の電気
防食方法。1. Electrolytic protection of the target pipe is carried out by winding and fixing a plate-shaped galvanic anode whose outer surface is coated with insulation so that the inner surface of the plate-shaped galvanic anode is in contact with the outer periphery of the target pipe. A method for cathodic protection of piping characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56133642A JPS5834288A (en) | 1981-08-26 | 1981-08-26 | Electric corrosion protective method for piping |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56133642A JPS5834288A (en) | 1981-08-26 | 1981-08-26 | Electric corrosion protective method for piping |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5834288A JPS5834288A (en) | 1983-02-28 |
| JPH0137480B2 true JPH0137480B2 (en) | 1989-08-07 |
Family
ID=15109583
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56133642A Granted JPS5834288A (en) | 1981-08-26 | 1981-08-26 | Electric corrosion protective method for piping |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5834288A (en) |
-
1981
- 1981-08-26 JP JP56133642A patent/JPS5834288A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5834288A (en) | 1983-02-28 |
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