Arizona Plumbing Practice Exam

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Prepare for the Arizona Plumbing Exam with quizzes, flashcards, and multiple-choice questions; each with detailed explanations and helpful hints.

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Which type of joint connection is prohibited in gas line piping?

Solder
Welded
Compression
Threaded

The correct answer is: Compression

Compression fittings are not allowed for gas line piping connections because they often rely on a rubber or plastic seal that can deteriorate over time due to heat and exposure to gas. This deterioration can lead to leaks, which poses a significant safety hazard. In applications involving gas, it is essential to use connections that provide a reliable and durable seal to prevent the risk of leaks and ensure safety. Solder joints, while typically used for water lines, are not suitable due to the melting point of solder and the heat associated with gas. Welding can create a strong and permanent joint but also requires specific conditions and methods to ensure safety. Threaded connections are allowed in gas piping as they can create a secure and effective seal when properly installed. Thus, among the options provided, compression fittings are specifically regarded as inappropriate for gas line applications due to concerns about their long-term durability and reliability.