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Answer :
Final answer:
The gas normally used to pre-charge accumulators is dry nitrogen, due to its inert properties and abundance. Other gases like helium and oxygen are less suitable because they either come with higher costs or safety risks. Nitrogen ensures optimal performance in hydraulic systems by maintaining required pressure and volume.
Explanation:
Pre-charging Accumulators with Gas
When it comes to pre-charging accumulators, the most commonly used gas is dry nitrogen. This gas is favored due to its inert nature, meaning it does not react easily with other substances, which is crucial in preventing contamination and chemical reactions in sensitive equipment.
Nitrogen occupies approximately 78.1% of the atmosphere, making it readily available and economical. Additionally, using nitrogen helps maintain pressure and volume in hydraulic systems, ensuring efficient operation.
Comparison with Other Gases
Other gases like helium, oxygen, and air may also be used to some extent, but they have their drawbacks:
- Helium: This lighter gas is ideal for applications requiring low density, but it is more expensive.
- Oxygen: Not suitable as it can promote combustion, posing safety risks.
- Air: While it contains nitrogen, it also includes oxygen, which again leads to safety concerns due to potential oxidation.
Overall, for the purpose of pre-charging accumulators efficiently and safely, dry nitrogen remains the preferred choice.
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