When you finish this lesson, you will be able to describe different types of tube assemblies which may need repair in a boiler. You will be able to list common causes of leaks and procedures for repairing the tube and tube assemblies. • Describe different types of boiler tube assemblies • List causes of tube leaks and ruptures • Explain the procedure for repairing a ruptured tube by closing • Explain the procedure for cladding or shielding a damaged boiler tube • Explain the procedure for replacing a damaged section of a tube or tube assembly • Explain the procedure for repairing a boiler tube using replacement window