TubeWeld [India] Limited manufactures Boiler Bank Tubes with or without Fins. TubeWeld [India] Limited supplies various types of industrial boiler plants. The Boiler Bank Tubes with or without Fins connect Steam and Mud drums in a boiler. Natural circulation occurs with out the aid of any external down comers. First 20-30% rows act as risers and the rest act as down comers. The membrane division wall separates the boiler bank and the furnace. Drum coil heaters are provided in the lower drum to preheat the feed water before sending it to economizer.