Question

8. Furnace can be arranged to burn what (firing)

13. Name the two basic categories of maintenance problems associated with heat exchangers

16. List the two elements involved in preparing for maintenance on heat exchangers.

19. Cleaning the tube side of a shell-and-tube heat exchanger involves cleaning any accumulation from:

20. why are a rian suit and eye protection necessary for a worker shooting tubes in a large heat
exchanger?

21. List two methods of cleaning the outside surfaces of tubes in a large shell- and-tube heat exchanger

26. Name the four types of plugs used in shell-and-tube heat exchangers to seal leaking tubes

28. Why is maintenance of a smaller heat exchanger done more easily in the shop?

29. Name two general examples of good practices to follow during disassembly of a small heat
exchanger

Answer 1

Two basic categories of maintenance problems associated with heat exchangers are (a) Mechanical (b) induced corrosion (a) Mechanical (1) Metal Erosion (2) Steam or water Hammer (3) Vibration (4) Thermal fatigue (5) Freeze � up (6) Thermal expansion (b) Chemically induced corrosion (1) General corrosion (2) Pitting corrosion (3) Stress corrosion (4) Dezincification (5) Galvanic corrosion Cleaning the tube side of a shell and tube. heat exchanger involves cleaning any from;- (1) Settlement of , rust or dust particle (2) Biological deposits (3) Corrosion (4) Crystallization (5) and oxidation. (6) Crystallization.