Failure investigation of a boiler bank tube from a 77 × 2 MW coal based thermal power plant in the northwest region of India

► Boiler bank tube is failed due to corrosion from fireside as well as waterside.
► Ash corrosion is operative from the fireside of the tube.
► Galvanic and localized corrosion are operative from the waterside of the tube.
► Accumulation of ash deposits and improper cleaning procedures leads to failure.