Liquified compressed Gas (Round Heads) have a pressure range of

• A. 50-100 psi
• B. 100-500 psi
• C. 200-800 psi
• D. 600-900 psi

Answer: (B)

Liquified compressed gas cylinders are designed to keep the contents as a liquid under pressure, so the pressure inside is governed by the liquid’s vapor pressure at ambient temperature. For round-head liquified gas cylinders, that operating pressure typically falls in the mid-hundreds of psi. The 100-500 psi range best matches this common range. The other options are outside what these cylinders normally maintain: too low for a liquified gas stored as a liquid, or too high and more characteristic of different cylinder designs or non-liquified gases. Temperature can shift the pressure, but the general range for round-head liquified gases stays around the hundreds of psi.