What is the pressure range for the MC 331 cargo tank?

• A. 3-10 psi
• B. 50-100 psi
• C. 100-500 psi
• D. 1000-2000 psi

Answer: (C)

MC-331 cargo tanks are designed as low‑pressure transport for gases, with a maximum allowable working pressure that spans roughly 100 to 500 psi. This range captures the kinds of gases hauled in these tanks while keeping the shell thickness, insulation, and safety features practical. The higher end accommodates gases that require a bit more pressure, but it’s still well below the high-pressure tanks (which are designed for thousands of psi). The options with much lower pressures (3–10 psi or 50–100 psi) don’t fit the typical MAWP of MC‑331 tanks, and the very high 1000–2000 psi range is characteristic of high‑pressure MC‑338 tanks. Hence, 100–500 psi is the correct range.