please help me only filling the blank questions (14-15-17-18-22-23-25-27) 18. 13
ID: 2086955 • Letter: P
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please help me only filling the blank questions (14-15-17-18-22-23-25-27)
18. 13. Name the two basic categories of maintenance problems associated with heat exchangers. 14 Sacrificial anodes are bolted inside the of a heat exchanger. 15. Sacrificial anodes minimize _ within a heat exchanger. 16. List the two elements involved in preparing for maintenance on heat exchangers. 17. The two factors that determine the choice of tools and equipment for a specific heat exchanger maintenance job are familiarity with the (a)__ _and knowledge of the (b). Blockage in a shell-and-tube heat exchanger may range from relatively light accumulations of (a) and (b) _ _to heavy blockage caused by (c). __in cooling water. 19. Cleaning the tube side of a shell-and-tube heat exchanger involves cleaning any accumulation from: 20. Why are a rain 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. Automatic cleaning systems work by either (a) ----------- or (b)----------------- means. Some automatic chemical cleaning systems periodically introduce chlorine into the incoming water to kill------- and prevent growth on tube walls. Name the two general types of tests used to find leaks in heat exchangers. When a main condenser is to be flooded, jack or supports may be necessary to _------ How can leaks be sealed in a surface heat exchanger? 26. Name the four types of plugs used in shell-and-tube heat exchangers to seal leaking tubes. 27. Maintenance of smaller heat exchangers is approached differently from large heat exchangers because the smaller components are (a)_ _and can be moved by (b) --Explanation / Answer
14. Sacrificial anodes are bolted on to the exchanger side walls.
15. Sacrificial anodes mimizes the corrosion within a heat exchanger.
17. (a)type of deposits
(b) Knowledge of heat exchanger
18. (a) Scale deposits
(b) Corrosion due to heavy blockage
(C) Dissolved salts in cooling water
22. Mechanical means(External), Chemical means (Internal)
23. Micro organisms like viruses, bacteria, fungus.
25. Restrict the spring force.
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