Underwater Tools And Equipment Practice Test

What are the typical pressures for oxyacetylene cutting?

O2 10-15 PSI; Acetylene 20-25 PSI O2 20-25 PSI; Acetylene 5-7 PSI, not to exceed 15 PSI O2 30-40 PSI; Acetylene 5-10 PSI O2 5-10 PSI; Acetylene 20-25 PSI

Correct Answer:

O2 20-25 PSI; Acetylene 5-7 PSI, not to exceed 15 PSI

Explanation:

In oxyacetylene cutting, you want a strong oxygen stream to oxidize and push away molten metal, while the fuel gas is kept at a lower, controllable pressure to shape and stabilize the flame. The typical setup uses oxygen around 20–25 psi so the jet is powerful enough to sustain cutting. Acetylene is kept much lower, about 5–7 psi, and should not be allowed to exceed roughly 15 psi, to maintain a stable, hot flame and reduce the risk of backfire or flashback. This combination produces a clean, efficient cut; pressures that push too much acetylene or drop the oxygen pressure too low lead to poor cuts or dangerous conditions.

Access more questions from this quiz

Continue to Underwater Tools and Equipment Practice Test for more practice questions and the full quiz experience.

Access More Questions