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With the continuous expansion of industrial production, the use of more and more anti-corrosion materials is increasing. Sacrificial anodes, in particular, play a particularly prominent role in their applications. Furthermore, these products are non-polluting and non-irritating when used in soil or water. So, how much do you know about the installation and usage requirements for sacrificial anodes? Let's take a look at the following introduction.
In actual use, sacrificial anodes are gradually consumed as the current flows. Since they consume quickly, their installation location and method must facilitate replacement. The type, quantity, distribution, and connection of sacrificial anodes should meet design requirements. Let's take a look at how to safely install them:
1. Where bracelet anodes are used, the pipe covering beneath the anodes must be free of defects. When installing bracelet anodes, care should be taken to avoid damaging the covering.
2. Where bagged anodes are used, trenches or plowing can be used, with or without chemical filler as required, typically parallel to the protected pipe section. Recommended reading: Distributed Installation Methods for Cathodic Protection
3. Bagged sacrificial anodes should be backfilled with properly compacted material. When anodes and specialized packing materials are supplied separately, the anode should be placed in the center of the packing material, and the packing material should be tamped firmly before backfilling. Care should be taken during all operations to ensure that the conductors and connectors are not damaged.
The shape, flatness, and length of sacrificial anodes allow for easy bending, making them uniquely suitable for cathodic protection projects, particularly in long-distance pipeline crossings, large storage pipeline crossings, grounding grids for lightning protection at the bottom of large storage tanks, and short-term anodes in composite anodes.
Calculating the Required Protection Current of Sacrificial Anodes: The required protection current for steel pipe piles is calculated based on the protection current density and protected area of each part of the steel pipe pile. The protection current density of sacrificial anodes selected for bare and coated steel components varies significantly across different countries and regions and in different corrosion zones. The protection current density for bare steel in seawater is generally 150 mA/m². Based on the actual conditions of the project, such as the dielectric resistivity of the geographical location, the wharf structure, the material of the steel pipe piles, the surface condition, the coating type and thickness, and the coating service life, and with reference to relevant standards and specifications and a large amount of actual engineering experience, the protective current density of the steel pipe piles is finally determined and the total protective current of each part is calculated.
