AWS Welding Inspection and Testing Certification Practice Test

What is the maximum safe working pressure for acetylene?

1. 10 psi

2. 15 psi

3. 20 psi

4. 25 psi

The correct answer is: 15 psi

The maximum safe working pressure for acetylene is indeed 15 psi. Acetylene is a highly flammable gas, and due to its unique molecular structure, it has specific safety considerations when being stored and used. When acetylene is contained in a cylinder, the gas is stabilized by being dissolved in a solvent, usually acetone. If acetylene is allowed to exceed 15 psi, the risk of instability increases. Pressures higher than this can lead to the dissociation of the gas into carbon and hydrogen, which could potentially result in a dangerous situation, including explosions. In industrial settings, such as in welding, adhering to this maximum pressure is crucial for ensuring the safety of personnel and equipment. Thus, understanding and applying this limit is key to safe operations when handling acetylene cylinders.