Q9. With reference to multi-tubular heat exchangers explain:
(A) How and where impingement attack is likely to occur in the tubes
(B) Why is it desirable that coolant flow rate should not exceed that required to maintain correct fluid temperature
(C) Ample well-shaped water boxes and smooth tube inlets are desirable
(D) Partial obstruction of tube bore is a common cause of tube failure
Q8. A LT cooler of the centralized cooling water system on your ship is showing poor performance. What measures you would initiate to rectify the problem and improve the performance. (16)
Q9. With reference to tubular heat exchangers explain:
a) How differential movement tubes and body is accommodated when the tube plates are rigidly located in the body,
b) How and why turbulence is imparted to fluid flow through the tubes,
c) Why it has become possible to discard sacrificial anodes in sea water coolers,
d) What is meant by the term ‘guided flow’, with particular reference to oil heaters.
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