Boiler System
Low NPSH versions (oversized impeller in 1st stage) for boiler feed pumps can better handle poor inlet pressure and hot water. Some installations result in same temperatures in the feed pumps as in the boiler. With air-cooled top the shaft seals are protected.
Direct boiler feed with speed-controlled pumps replaces the modulating valves and leads to lower energy consumption, less stress on components and better steam quality. Stable operation with pump curve compensation for low flows with Grundfos frequency converters. Using a level sensor in the boiler for optimum level leads to better steam quality, efficiency and reliability. MAGdrive or double shaft seal to prevent from air entering the pump in duty/stand-by configurations.
