Millwright Level 1 Practice Exam 2026 - Free Millwright Practice Questions and Study Guide

Question: 1 / 445

What is the maximum safe working pressure for acetylene?

10 PSI

15 PSI

The maximum safe working pressure for acetylene is 15 PSI. This limit is established due to acetylene's unique properties and the risks associated with its use. Acetylene is a highly flammable gas, and when stored in high-pressure conditions, it can become unstable and dangerous.

Exceeding this pressure can lead to the possibility of a hazardous situation, including the risk of an explosive decomposition. For safety purposes, acetylene is stored in cylinders under pressure, but the pressure must not exceed 15 PSI to ensure safe handling and usage, especially in applications like welding and cutting. Therefore, understanding and adhering to this maximum pressure is essential for operating safely with acetylene.

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20 PSI

25 PSI

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