For most oxy/acetylene work, what are the recommended initial delivery pressures for acetylene and oxygen?

The recommended initial delivery pressures for acetylene and oxygen in oxy/acetylene work are critical for ensuring safety and efficiency during welding and cutting processes. In the case of option B, the initial delivery pressures of 5 psi for acetylene and 35 psi for oxygen align with industry standards, which prioritize safe operation and optimal performance of the equipment.

Acetylene is typically kept at a lower pressure—5 psi minimizes the risk of flashbacks and explosions, as higher pressures can lead to greater volatility. Meanwhile, oxygen is delivered at a higher pressure—35 psi is common—because it facilitates combustion and enhances the flame's characteristics, required for effective cutting or welding.

This balance of pressures helps in controlling the flame's temperature and ensuring it is suitable for various applications in metalworking. Understanding these parameters is vital for operators, as they contribute to achieving the correct flame type and working safely with the gases involved.