New Mexico Pipe Fitter Journeyman (JPF) Practice Exam

Acetylene is an unstable compound and should not be compressed _________ psi when in free state?

1. 20

2. 15

3. 30

4. 10

The correct answer is: 15

Acetylene is indeed an unstable compound and presents unique safety considerations when being handled. It must not be compressed higher than 15 psi because exceeding this pressure can lead to a dangerous situation where the gas can detonate. In its free state, acetylene is stable only up to this pressure threshold. When acetylene is stored or used, it is typically in a carrier material or a solution to mitigate the risks associated with its instability at higher pressures. Understanding this critical pressure limit is essential for safe operations in pipe fitting and welding applications where acetylene is utilized.