JPH0351335Y2 - - Google Patents
Info
- Publication number
- JPH0351335Y2 JPH0351335Y2 JP1987125189U JP12518987U JPH0351335Y2 JP H0351335 Y2 JPH0351335 Y2 JP H0351335Y2 JP 1987125189 U JP1987125189 U JP 1987125189U JP 12518987 U JP12518987 U JP 12518987U JP H0351335 Y2 JPH0351335 Y2 JP H0351335Y2
- Authority
- JP
- Japan
- Prior art keywords
- oil tank
- bottom plate
- protection device
- galvanic anode
- anode
- 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
- 238000004210 cathodic protection Methods 0.000 claims description 15
- 238000005260 corrosion Methods 0.000 claims description 14
- 230000007797 corrosion Effects 0.000 claims description 14
- 239000007788 liquid Substances 0.000 claims description 8
- 239000008151 electrolyte solution Substances 0.000 claims description 6
- 150000003839 salts Chemical class 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 239000003792 electrolyte Substances 0.000 claims description 4
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical group [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052725 zinc Inorganic materials 0.000 claims description 3
- 239000011701 zinc Substances 0.000 claims description 3
- 229910000838 Al alloy Inorganic materials 0.000 claims description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 2
- 229910000861 Mg alloy Inorganic materials 0.000 claims description 2
- 229910001297 Zn alloy Inorganic materials 0.000 claims description 2
- 239000011777 magnesium Substances 0.000 claims description 2
- 229910052749 magnesium Inorganic materials 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 description 11
- 239000010959 steel Substances 0.000 description 11
- 238000000576 coating method Methods 0.000 description 8
- 239000011248 coating agent Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 239000003973 paint Substances 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 238000010422 painting Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 238000005536 corrosion prevention Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Landscapes
- Prevention Of Electric Corrosion (AREA)
Description
【考案の詳細な説明】
〔考案の利用分野〕
本考案は、石油タンク底板内面の電気防食装置
に関し、さらに詳しくは石油タンク底板内面の腐
食を防止して、定期検査時の手間や費用を大幅に
軽減し、また石油タンクの安全性を向上させた石
油タンク底板内面の電気防食装置に関する。[Detailed description of the invention] [Field of application of the invention] The present invention relates to a cathodic protection device for the inner surface of the bottom plate of an oil tank. This invention relates to a cathodic protection device for the inner surface of the bottom plate of an oil tank, which reduces corrosion and improves the safety of the oil tank.
鋼製石油タンク底板内面は、貯蔵する石油類中
に含まれる海水等により腐食を起こすことが多
い。従来は、この腐食防止方法として一般的にコ
ーテイング、ライニング又はペイント塗装による
方法が実施されている。
The inner surface of the bottom plate of a steel oil tank is often corroded by seawater contained in the stored oil. Conventionally, this corrosion prevention method has generally been carried out by coating, lining, or painting.
また一部ではあるが、底板にアルミニウム溶射
鋼板やクラツド鋼板等の特種金属の使用した例も
ある。 In some cases, special metals such as aluminum sprayed steel plates and clad steel plates are used for the bottom plates.
さらに、試験的にはテープ状の陽極を底板内面
に貼り付ける電気防食方法が行われており、例え
ば、特開昭58−41085号公報および特開昭59−
50185号公報に開示されている。 Furthermore, a cathodic protection method in which a tape-shaped anode is attached to the inner surface of the bottom plate has been experimentally carried out, for example, in JP-A-58-41085 and JP-A-59-
It is disclosed in Publication No. 50185.
上述した従来の塗装等により得られた塗膜を用
いた防食方法は、その塗膜により良好な防食効果
が発揮される半面、鋼板製石油タンク底板の定期
検査時に実施されている肉厚検査、溶接線検査の
ため塗膜の剥離および検査後の再塗装に相当の手
間と費用を要していた。また塗膜の施工不良等に
より、使用中に塗膜が剥離したり、ピンホールの
発生があつた場合、不良施工場所が選択的に腐食
する傾向にあつた。さらに一般的な塗膜は非電導
性であり、タンク内部に蓄積された静電気を逃し
難いため安全上の問題もあつた。
The anticorrosion method using a coating film obtained by the conventional painting method described above has a good anticorrosion effect due to the coating film. To inspect weld lines, it required considerable effort and expense to remove the paint film and repaint after inspection. Furthermore, if the coating film peels off during use or pinholes are generated due to poor application of the coating film, there is a tendency for corrosion to occur selectively at the locations where the coating film has been poorly applied. Furthermore, general coatings are non-conductive, making it difficult for static electricity accumulated inside the tank to escape, posing a safety problem.
さらには従来の電気防食は、テープ状のため、
陽極寿命が短いことおよびテープの剥離復旧作業
は依然として避けられないという欠点があつた。 Furthermore, conventional cathodic protection is in the form of a tape,
Disadvantages include short anode life and unavoidable tape removal and restoration work.
本考案の目的は、通常の電気防食では効果を発
揮できなかつた良好な防食効果をもたらすと共
に、従来の防食方法の欠点を解消させ、費用、手
間の軽減および安全性の向上を達成し得る石油タ
ンク底板の電気防食装置を提供することにある。 The purpose of the present invention is to provide a good corrosion protection effect that cannot be achieved with ordinary cathodic protection, and also to eliminate the shortcomings of conventional corrosion protection methods, reducing cost and effort, and improving safety. The purpose of the present invention is to provide a cathodic protection device for tank bottom plates.
本考案者等は、上記目的を達成するために種々
検討した結果、下記に示す電気防食装置がこれら
の問題点を解決し得ることを知見して本考案を完
成するに至つた。
As a result of various studies to achieve the above object, the present inventors found that the cathodic protection device shown below can solve these problems and completed the present invention.
すなわち本考案は、石油タンク底板内面に付設
された流電陽極と、少なくとも該流電陽極が完全
に浸漬されるように、石油タンク側面に設けられ
た貯蔵液出入口ノズルの下方まで張り込まれた電
解液とを有することを特徴とする石油タンク底板
内面の電気防食装置である。 In other words, the present invention includes a galvanic anode attached to the inner surface of the bottom plate of an oil tank, and a galvanic anode installed at least below the storage liquid inlet/outlet nozzle provided on the side of the petroleum tank so that the galvanic anode is completely immersed. This is an electrolytic protection device for the inner surface of an oil tank bottom plate, characterized by having an electrolyte.
このような本考案の電気防食装置は、流電陽極
が鋼製石油タンク底板内面に固定されていること
と、電解液が貯蔵液出入口ノズルの下方で、しか
も流電陽極が完全に浸漬されるように張り込まれ
ていることに特徴を有するものである。 The electrolytic protection device of the present invention has the following features: the galvanic anode is fixed to the inner surface of the bottom plate of the steel oil tank, and the electrolytic solution is placed below the storage liquid inlet/outlet nozzle, and the galvanic anode is completely immersed. It is characterized by the fact that it is stuck in place like this.
以下、本考案を図面を参照しながら説明する。 Hereinafter, the present invention will be explained with reference to the drawings.
第１図は本考案の一実施例に係る電気防食装置
を設置した石油タンクの縦断面図を示す。 FIG. 1 shows a longitudinal sectional view of an oil tank equipped with a cathodic protection device according to an embodiment of the present invention.
第２図は、流電陽極接続部の平面図である。 FIG. 2 is a plan view of the galvanic anode connection.
第１図に示す直径80ｍの10Kタンクにおい
て、第２図に示すタンク底板１の溶接線２（全長
2200ｍ）に沿つて２個の取付けボルトが立設され
た複数の取付け鋼板７をタンク底板１に溶接し
た。また、これら鋼板６には、それぞれ陽極心金
９を溶接し、さらに流電陽極４の端部を固定サド
ル１０で固定鋼板６に固定した。 In the 10K tank with a diameter of 80 m shown in Fig. 1, weld line 2 (total length
A plurality of mounting steel plates 7 on which two mounting bolts were erected along a length of 2200 m) were welded to the tank bottom plate 1. Further, an anode core metal 9 was welded to each of these steel plates 6, and furthermore, the end portion of the galvanic anode 4 was fixed to the fixed steel plate 6 with a fixed saddle 10.
このように、本実施例では流電陽極４として５
ｍの線状の亜鉛陽極（三井金属鉱業株式会社製、
商品名ZAPLINE）を固定鋼板６を介して順次接
続し、約6900本の流電陽極４をタンク底板１に取
付けた。ここで用いられる流電陽極４は、被防食
鋼材である石油タンク底板１内面材質と比較して
電位的に活性を有する金属または合金であること
が必要で、具体的には亜鉛、亜鉛合金、アルミニ
ウム、アルミニウム合金、マグネシウムおよびマ
グネシウム合金等の流電陽極が使用できる。これ
らの金属または合金を流電陽極４として使用する
ことにより、犠牲陽極として作用し、石油タンク
底板１内面の腐食が防止される。 In this way, in this embodiment, 5 is used as the current anode 4.
m linear zinc anode (manufactured by Mitsui Mining & Mining Co., Ltd.,
(trade name: ZAPLINE) were sequentially connected via fixed steel plates 6, and approximately 6,900 galvanic anodes 4 were attached to the tank bottom plate 1. The galvanic anode 4 used here needs to be made of a metal or alloy that is more electrically active than the inner surface material of the oil tank bottom plate 1, which is a steel material to be protected from corrosion. Specifically, zinc, zinc alloy, Galvanic anodes such as aluminum, aluminum alloys, magnesium and magnesium alloys can be used. By using these metals or alloys as the galvanic anode 4, it acts as a sacrificial anode and prevents corrosion of the inner surface of the oil tank bottom plate 1.
一方、上記流電陽極４の付設後において、貯蔵
液１１を入れる前に電解液５を流電陽極４の上端
から貯蔵液出入口ノズル３の間の任意に設定した
レベルに張り込む。この電解液５としては、抵抗
率が500Ω・cmの塩水を張り込んだ。本考案にお
いては、電解液５として抵抗率が100〜3000Ω・
cmの塩水が好ましく、300〜1000Ω・cmの塩水が
さらに好ましい。塩水の抵抗率が100Ω・cm未満
では電解生成物が溶接部に多量に付着するように
なり、また3000Ω・cmを超えた場合には防食効果
が低下する。 On the other hand, after the galvanic anode 4 is attached, and before the storage liquid 11 is introduced, the electrolytic solution 5 is poured into an arbitrarily set level between the upper end of the galvanic anode 4 and the storage liquid inlet/outlet nozzle 3. As this electrolytic solution 5, salt water having a resistivity of 500 Ω·cm was charged. In this invention, the electrolytic solution 5 has a resistivity of 100 to 3000Ω.
cm of salt water is preferred, and 300 to 1000 Ω·cm of salt water is more preferred. If the resistivity of salt water is less than 100 Ω·cm, a large amount of electrolytic products will adhere to the weld, and if it exceeds 3000 Ω·cm, the anticorrosion effect will decrease.
また、この電解液５は、流電陽極４の上端から
貯蔵液出入口ノズル３の間の任意に設定したレベ
ルに張り込む。例えば、300mm以上の高さに張り
込めば、それだけ上記ノズル３以下の残留貯蔵液
を有効に活用できる。本実施例では流電陽極４の
上端から約300mmの高さに張り込んだ。 Further, this electrolytic solution 5 is injected into an arbitrarily set level between the upper end of the current anode 4 and the storage solution inlet/outlet nozzle 3. For example, if the height is 300 mm or more, the remaining liquid stored in the nozzle 3 or less can be used more effectively. In this embodiment, the galvanic anode 4 is placed at a height of about 300 mm from the upper end.
このようにして設置された本考案の電気防食装
置は、長期間に亘つて石油タンク底板内面に対し
て良好な防食性を示した。なお、本実施例では電
機防食装置に加えて、溶接部を除いたタンク底
板、側板にガラスフレークライニングを施工した
が、他の防食手段と併用して、石油タンク底板内
面のみならず、側板等の防食を図ることは任意で
ある。しかしながら、本考案の電気防食装置のみ
で石油タンク底板内面に良好な防食効果は充分に
得られる。 The cathodic protection device of the present invention installed in this manner showed good corrosion protection against the inner surface of the oil tank bottom plate over a long period of time. In this example, in addition to the electrical corrosion protection device, glass flake lining was installed on the bottom plate and side plates of the tank except for welded parts, but when used in conjunction with other corrosion protection measures, it is possible to apply glass flake lining not only to the inner surface of the oil tank bottom plate but also to the side plates, etc. It is optional to try to prevent corrosion. However, only the cathodic protection device of the present invention can sufficiently provide a good corrosion protection effect on the inner surface of the bottom plate of an oil tank.
以上説明したように、本考案の電気防食装置
は、従来のように溶接線上を塗膜やテープ状陽極
で被覆しないので、定期検査時における塗膜等の
剥離や再塗装等に必要とする手間と費用を大幅に
軽減することができる。またタンク内の静電気を
非電導性の塗膜と異なり、速やかにタンク外部に
逃がし易いため、安全性も向上する。
As explained above, the cathodic protection device of the present invention does not cover the weld line with a paint film or tape-shaped anode as in the past, so there is no need for the effort required to remove the paint film or repaint during periodic inspections. and costs can be significantly reduced. Furthermore, unlike a non-conductive coating, static electricity inside the tank can be easily released to the outside of the tank, improving safety.
さらに、従来の貯蔵液出入口ノズル以下の利用
できない残留レベルに積極的に電解液を張り込む
ことにより、電気防食効果を最大限に発揮すると
ともに、タンク未使用スペースの有効利用を図る
ことができる。 Furthermore, by actively filling the unusable residual level below the conventional storage liquid inlet/outlet nozzle with electrolyte, it is possible to maximize the cathodic protection effect and make effective use of unused space in the tank.
従つて、本考案の電気防食装置は、石油タンク
底板内面の防食に好適に用いることができる。 Therefore, the cathodic protection device of the present invention can be suitably used for corrosion protection of the inner surface of the bottom plate of an oil tank.
第１図は本考案の一実施例に係る電気防食装置
を設置した石油タンクの縦断面図、第２図は、流
電陽極接続部の平面図である。
１……底板、２……溶接線、３……出入口ノズ
ル、４……流電電極、５……電解液、６……固定
鋼板、７……取付鋼板、８……取付ボルト、９…
…陽極心金、１０……固定サドル、１１……貯蔵
液。
FIG. 1 is a longitudinal sectional view of an oil tank equipped with a cathodic protection device according to an embodiment of the present invention, and FIG. 2 is a plan view of a galvanic anode connection portion. 1... Bottom plate, 2... Welding line, 3... Inlet/outlet nozzle, 4... Current electrode, 5... Electrolyte, 6... Fixed steel plate, 7... Mounting steel plate, 8... Mounting bolt, 9...
... Anode core metal, 10 ... Fixed saddle, 11 ... Storage liquid.
Claims (1)
と、少なくとも該流電陽極が完全に浸漬される
ように、石油タンク側面に設けられた貯蔵液出
入口ノズルの下方まで張り込まれた電解液とを
有することを特徴とする石油タンク底板内面の
電気防食装置。 ２ 前記流電陽極が、亜鉛、亜鉛合金、アルミニ
ウム、アルミニウム合金、マグネシウム、マグ
ネシウム合金から選ばれる実用新案登録請求の
範囲第１項に記載の石油タンク底板内面の電気
防食装置。 ３ 前記電解液が、抵抗率が100〜3000Ω・cmの
塩水である実用新案登録請求の範囲第１項また
は第２項に記載の石油タンク底板内面の電気防
食装置。[Scope of Claim for Utility Model Registration] 1. A galvanic anode attached to the inner surface of the bottom plate of an oil tank, and at least below a storage liquid inlet/outlet nozzle provided on the side of the oil tank so that the galvanic anode is completely immersed. A cathodic protection device for the inner surface of an oil tank bottom plate, characterized by having an electrolyte filled therein. 2. The electric corrosion protection device for the inner surface of an oil tank bottom plate according to claim 1, wherein the galvanic anode is selected from zinc, zinc alloy, aluminum, aluminum alloy, magnesium, and magnesium alloy. 3. The electric corrosion protection device for the inner surface of an oil tank bottom plate according to claim 1 or 2, wherein the electrolytic solution is salt water with a resistivity of 100 to 3000 Ω·cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987125189U JPH0351335Y2 (en) | 1987-08-19 | 1987-08-19 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987125189U JPH0351335Y2 (en) | 1987-08-19 | 1987-08-19 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6430360U JPS6430360U (en) | 1989-02-23 |
| JPH0351335Y2 true JPH0351335Y2 (en) | 1991-11-01 |
Family
ID=31375573
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1987125189U Expired JPH0351335Y2 (en) | 1987-08-19 | 1987-08-19 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0351335Y2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5841085A (en) * | 1981-08-26 | 1983-03-10 | 日本防蝕工業株式会社 | Corrosion protective method for bottom plate of tank |
-
1987
- 1987-08-19 JP JP1987125189U patent/JPH0351335Y2/ja not_active Expired
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5841085A (en) * | 1981-08-26 | 1983-03-10 | 日本防蝕工業株式会社 | Corrosion protective method for bottom plate of tank |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6430360U (en) | 1989-02-23 |
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