To what working pressure must liquid gases be reduced?

• A. 100 psi
• B. 5 psi
• C. 50 psi
• D. 200 psi

Answer: (C)

When handling liquid gases, the system must reduce the stored high pressure to a safe, usable level before use. A regulator does this, ensuring a consistent downstream pressure that the equipment is designed to handle. For most liquid-gas setups, about 50 psi is the standard working pressure because it provides a reliable flow and keeps all components—valves, hoses, regulators—within their rated limits. Pressures higher than this (like 100 or 200 psi) can exceed equipment ratings and raise safety risks, while much lower pressures (like 5 psi) may not supply enough flow for practical use. So, 50 psi is the practical, safe working pressure for liquid gases.