e/Internally riffled boiler tubes

Information
has gloss	eng: Internally riffled boiler tubes are used to evaporate water into steam inside boilers of thermal power plants. Because of their internally riffled shape, they are more efficient. The boiling crisis takes place later, thus allowing for greater heat transfer between the pipe and the fluid inside the pipe. Costs of this type of tube are generally higher than plain tubes. Current research into these tubes is being conducted due to their potential to increase efficiency of power plants.
lexicalization	eng: Internally riffled boiler tubes
instance of	(noun) sealed vessel where water is converted to steam boiler, steam boiler