Coast Guard Regulations (46 CFR) state that main propulsion water-tube boilers are not required to be fitted with a surface blow off valve if the design pressure is __________.

Correct Answer: Option D — 350 psig (2413 kPa) or over

Title 46 CFR regulations exempt high-pressure marine water-tube boilers with a design pressure of 350 psig or greater from requiring a surface blow-off valve, relying instead on high-purity feed water management and continuous blowdown.