G2 Gas Fitter Practice Exam

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What is the primary purpose of using mercaptan in natural gas?

To enhance combustion
To detect leaks
To improve storage
To moderate flow rates

The correct answer is: To detect leaks

The primary purpose of using mercaptan in natural gas is to provide a detectable odor, which serves as a vital safety feature. Natural gas is odorless in its pure form, making it difficult for people to notice leaks. By adding mercaptan, which has a strong, distinctive smell often likened to rotten eggs, it allows individuals to quickly identify the presence of gas in the event of a leak. This prompt detection is essential for taking safety precautions to prevent potential hazards, including explosions or asphyxiation. While mercaptan does not enhance combustion, improve storage, or moderate flow rates, these factors are not its main role. Instead, the addition of mercaptan is a critical safety measure that helps protect people and property by enabling quick detection of gas leaks.