Millwright Level 1 Practice Exam

Which of the following statements is true regarding acetylene?

1. It is safe to use at pressures above 20 PSI

2. It is less flammable than propane

3. It should not be stored above 15 PSI

4. It can be used indefinitely at critical pressure

The correct answer is: It should not be stored above 15 PSI

Acetylene is a widely used gas in welding and cutting applications, but it has specific requirements for safe storage and handling. The statement that acetylene should not be stored above 15 PSI is accurate because at pressures above this level, acetylene can become unstable and pose safety risks, including the potential for explosions. Acetylene is typically dissolved in a solvent such as acetone for safe storage, which allows it to be transported and used at pressures around 10 to 15 PSI. Storing it above this pressure could lead to the gas decomposing and forming hazardous conditions. This safety measure is critical for preventing accidents in environments where acetylene is utilized. Thus, adherence to the proper pressure limits is essential for safety in handling and storage.