lancashire boiler - 3d model ravindramohanbooks2018 94348ff lancashrie horizontal internally fired natural circulation fire tube rises steam upto pressure its bar maximum evaporating capacity 8500 kg per hour very widely used sugar mills chemicals products industries required processing work construction consist shell placed brick tubes diameter 04 times runs through out length each these flue inside their front end space underneath grate ash pit setting designed so provide enclosed chamber rear which connected bottom central channel unturn side 1 2 two common passage chimney