Electrolytic corrosion prevention device

Abstract

This invention provides a corrosion prevention device that can prevent galvanic corrosion and leakage problems in iron seawater pipes that use seawater as a cooling medium, thereby reducing equipment downtime, worker workload, repair costs, and operational efficiency. [Solution] By installing a zinc rod 8 with a high potential inside the iron seawater pipe 1 and connecting the installed zinc rod to a metal part with a low potential using copper wire 10, corrosion of the iron seawater pipe is suppressed, and by regularly inspecting the installed zinc rod, seawater leakage problems due to electrolytic corrosion of the iron seawater pipe can be avoided. Conventionally, iron seawater pipes have experienced problems where electrolytic corrosion occurs due to the potential difference, leading to rupture and seawater leakage.

Description

Technical Field

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[0001] The present invention relates to preventing galvanic corrosion of an iron seawater pipe due to the potential difference between dissimilar metals in the seawater pipe.

Background Art

[0002] Conventionally, zinc or the like for preventing galvanic corrosion due to potential difference has been attached to the main body of equipment using seawater as a cooling medium. However, galvanic corrosion occurred in the iron seawater pipe through which seawater flows due to the potential difference, leading to a breach and leakage of seawater.

Summary of the Invention

Problems to be Solved by the Invention

[0003] Conventionally, when an iron pipe is used in equipment using seawater as a cooling medium, galvanic corrosion occurs in the iron seawater pipe due to the potential difference between dissimilar metals, leading to a breach and causing problems such as seawater leakage. Each time, emergency repairs and pipe replacements have consumed time and labor.

Means for Solving the Problems

[0006] The shaded area labeled 1 in Figure 1 is an iron seawater pipe through which 12 units of seawater flow. 2 shows an additional branch pipe of the iron seawater pipe. To prevent seawater leakage, an iron sealing plate with a rubber gasket 3 and a zinc rod 8 is attached to the end of the additional iron seawater branch pipe 2 using bolts and nuts. On the seawater side inside the iron seawater pipe branch, a bolt 9 is attached to a zinc rod 8. A bolt 6 is welded to the outside of the iron sealing plate, and a copper wire 10 is attached via a crimp terminal 5 using a nut 7. One end of the copper wire 10 is connected to a brass valve with a lower potential in the iron seawater pipe, thereby preventing and suppressing electrolytic corrosion of the iron seawater pipe 1 due to the potential difference. [Examples]

[0007] The device shown in Figure 1 was actually installed in the outlet piping of a ship's main engine cooling seawater pump. One end of a 10-copper wire connected to 8 zinc rods was connected to a low-potential brass valve in an iron seawater pipe. After 6 months, the condition of the 8 zinc rods and the seawater pipe was checked, and corrosion was confirmed on the 8 zinc rods, while corrosion inside the 1 seawater pipe had been reduced.

[0008] Iron seawater pipes used in heat exchangers on ships and other vessels are susceptible to galvanic corrosion due to potential differences, leading to seawater leaks. Repairing these leaks previously required either shutting down the equipment and applying temporary leak repairs, or replacing the seawater pipes themselves. By regularly inspecting and replacing the zinc rods attached to the corrosion prevention device of this invention, galvanic corrosion of iron seawater pipes can be suppressed, reducing the need for crew members to stop operations due to sudden problems, lowering repair costs, and reducing the decrease in operational efficiency. [Brief explanation of the drawing]

[0009] [Figure 1] This figure shows one embodiment of the iron seawater pipe of the present invention. [Explanation of Symbols]

[0010] 1 Iron seawater pipe 2 Iron seawater pipe branch tubes 3. Rubber gasket 4 Iron closing plates 5 crimp terminals 6 volts 7 nuts 8 zinc rods 9 zinc rod mounting bolts 10 copper wire 11 Brass Valves 12 seawater

Claims

[Claim 1] A device for preventing and suppressing galvanic corrosion of iron seawater pipes, characterized in that a high-potential zinc rod or the like is installed inside a branch pipe of an iron seawater pipe that uses seawater as a cooling medium, and the zinc rod or the like is connected to a metal part with a low potential and a copper wire.

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