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Steel poles for transmission lines need protection against
Termites
Borer
Corrosion
All of the above
Corrosion
Steel poles used in overhead transmission lines are highly susceptible to oxidation when exposed to environmental factors like humidity, oxygen, and acidic pollutants. To prevent structural failure and maintain mechanical integrity, they require anti-corrosive protection such as galvanization or painting.
Steel poles used in overhead transmission lines are highly susceptible to oxidation when exposed to environmental factors like humidity, oxygen, and acidic pollutants. To prevent structural failure and maintain mechanical integrity, they require anti-corrosive protection such as galvanization or painting.
Fe+O2тАЛ+H2тАЛOтЖТFe2тАЛO3тАЛтЛЕnH2тАЛO тАФ The fundamental chemical reaction representing the formation of rust (corrosion).
The corrosion of steel is an electrochemical process. When exposed to moisture and air, the surface of the steel undergoes an oxidation-reduction reaction where iron (Fe) reacts with oxygen (O2тАЛ) and water (H2тАЛO) to form hydrated iron (III) oxide, commonly known as rust (Fe2тАЛO3тАЛтЛЕnH2тАЛO). This process leads to the loss of material and structural thinning, eventually compromising the tower's ability to withstand mechanical loads.
Corrosion significantly reduces the life span and structural safety factor of steel transmission structures.
Galvanization (coating steel with a thin layer of Zinc) is the most common industry practice to provide sacrificial protection.
Atmospheric conditions like high salt content (coastal areas) or chemical pollutants (industrial areas) accelerate the rate of corrosion.
Wooden poles are the ones that require treatment against termites and borers, not steel poles.
Protective coating increases the service life of steel structures.
Reduces maintenance frequency and replacement costs.
Protective coatings (like paint) require periodic re-application.
High initial cost of hot-dip galvanization process.
Transmission line towers.
Distribution steel tubular poles.
Substation structures.
Termites and borers are biological threats specifically relevant to wooden poles, not steel poles.
Steel poles must be protected against 'corrosion' to ensure long-term mechanical stability under various load conditions.
C is correct тАФ Steel poles are metallic structures that face degradation primarily through electrochemical corrosion, unlike wooden poles which are susceptible to biological decay.
Always differentiate between material-specific maintenance: Steel poles need corrosion protection, while wooden poles need preservative treatment (e.g., creosote) against decay and pests.