IMO Type 1 corresponds to which intermodal pressure range?

• A. 100-500 psi
• B. 25.4-100 psi
• C. 14.5-25.4 psi
• D. 23.5+ psi -130° or lower

Answer: (B)

Intermodal tank classifications are tied to the service pressure the container is designed to handle. IMO Type 1 is the category for moderate-pressure service, not the very high or very low ends. The 25.4 to 100 psi range sits in that middle band, which is why it’s the best match for Type 1. This range allows the tank to carry certain gases or liquids safely without needing the higher-strength build required for higher-pressure types, while still being more robust than the low-pressure cylinders used in simple, non-intermodal shipments. The other pressure ranges correspond to either higher-pressure designs or to pressures typical of non-intermodal low-pressure cylinders, which aren’t appropriate for the Type 1 intermodal vessels.