Jacket Water Cooling System

Question 1

1. a) Make a labelled sketch of a jacket cooling water system.
   b) State the purpose of the major components shown in sketch

Answer 1

b) The circulating pumps move the water within the system.
The pre heater is to heat the water back to operational temperature.
The de-aerating tank is to remove oxygen bubbles from the system.
The main cooler removes heat from the water.
The fresh water generator produces fresh water to use in the system.

Question 2

2. With reference to jacket cooling water treatment of a diesel engine;
   a) State the chemical tests carried out.

Answer 2

The chemical PH of the J.W. is maintained and controlled in order to prevent acidic or caustic corrosion.
The concentration of chemical inhibitors within the jacket water to protect against corrosion and scale.
The chloride content of the water, to monitor and control the concentration to prevent corrosion.

Question 3

2. With reference to jacket cooling water treatment of a diesel engine;
   a) State the chemical tests carried out.
   b) State the frequency of testing.
   v

Answer 3

b) Weekly as per planned maintenance scheduled.

Question 4

2. With reference to jacket cooling water treatment of a diesel engine;
   a) State the chemical tests carried out.
   b) State the frequency of testing.
   c) Explain why it is necessary to keep the test results within certain limits.

Answer 4

c) For the safe and efficient operation of the engine, whilst ensuring operation within manufacturers specifications.

Question 5

a) State the chemical tests carried out.
b) State the frequency of testing.
c) Explain why it is necessary to keep the test results within certain limits.
d) State the action to be taken to rectify an abnormal test result.

Answer 5

d) Retest, if still abnormal inform the Chief Engineer and following manufactures guidelines administer the correct course of treatment.