On offshore drilling units fitted with fixed CO2 systems, the system must withstand a bursting pressure of at least __________.

Correct Answer: Option B — 6,000 pounds per square inch

Under 46 CFR 108.435, fixed carbon dioxide systems on offshore drilling units must be constructed with piping, valves, and fittings capable of withstanding a bursting pressure of at least 6,000 pounds per square inch (psi). This extreme pressure rating ensures structural integrity against high cylinder discharge pressures during emergency system actuation.