The design pressure range of an IM 101 portable tank is:

• A. 50-150 psi
• B. 25.4-100 psi
• C. 5-25 psi
• D. 100-200 psi

Answer: (B)

The design pressure range shows the internal pressure a portable tank is engineered to safely contain and be tested to, not the pressure you would normally run it at. For IM-101 portable tanks, that safety envelope is up to about 100 psi, with a lower design pressure around 25.4 psi, giving a range of roughly 25.4–100 psi. This means the vessel, its valves, and safety reliefs are sized to stay safe up to 100 psi and accommodate contents that don’t require pressure higher than about 25 psi. A range like 50–150 psi would exceed the tank’s maximum rating, 5–25 psi would be below the typical IM-101 design, and 100–200 psi would exceed the maximum as well.