151. Coast Guard Regulations (46 CFR) require that the design pressure of an economizer integral with the boiler and connected to the boiler drum without intervening stop valves shall be at least equal to __________.

Coast Guard Regulations (46 CFR) require that an economizer integral with the boiler and connected to the boiler drum without intervening stop valves must have a design pressure of at least 110% of the highest drum safety-valve set pressure, reflecting its exposure to full boiler pressure.