Which measure is ineffective at mitigating corrosion in well casings_________________?
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Answer: D. using screens having larger area of openings
Explanation
Using well screens with a larger open area reduces entrance velocity, which mitigates corrosion and encrustation problems. Lower water entrance velocity prevents rapid chemical deposition and reduces localized electrochemical corrosion on metal casings. Maximizing open screen area is a recognized water well design technique for extending operational lifespan significantly. Well screen encrustation and corrosion are caused by high groundwater velocities drawing dissolved minerals against metal surfaces. Drawdown represents the lowering of the groundwater table around a pumping well during continuous operation. Well screens act as filters allowing clean groundwater to enter while holding back surrounding aquifer sand formations.
Reducing drawdown and pumping rate lowers entrance velocity, which effectively mitigates well casing corrosion and encrustation. Reducing flow velocity directly decreases the rate of electrochemical metal loss and mineral scale precipitation on screens. Using thicker pipes increases structural corrosion allowance, helping well casings endure chemical attack over longer operating periods.
- Subject
- Engineering
- Category
- Civil Engineering
- Topic
- —
- Difficulty
- medium
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