According to Coast Guard Regulations (46 CFR), feed water nozzles shall be fitted with sleeves, or have other suitable means employed to reduce the effects of temperature differentials on all boilers designed for operating pressures of __________.

Correct Answer: Option A — 400 psig (2859 kPa) or over

Under 46 CFR, boilers designed for operating pressures of 400 psig or greater must equip feed water nozzles with thermal sleeves or liners. These devices shield thick drum walls from severe thermal shock caused by temperature differentials between incoming feedwater and saturated steam.