In an operating diesel engine, which of the...

Question 1 / 270705eccefa2bacbc34ba4d47a2b

Question 1 of 270705eccefa2bacbc34ba4d47a2b

In an operating diesel engine, which of the following is true concerning a tube and shell type jacket water heat exchanger?

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Question 1 of 27070

In an operating diesel engine, which of the following is true concerning a tube and shell type jacket water heat exchanger?

🔍 Key Concepts

• Tube and shell heat exchanger flow paths for jacket water and seawater • Purpose of maintaining relative pressures between fresh water and sea water sides • Proper use and protection of zinc anodes (sacrificial anodes) in seawater systems

💭 Think About

• Think about which fluid you want inside the tubes versus around the tubes in case of a leak. Which one is easier/cheaper to lose and less damaging if it contaminates the other? • If there is a pinhole leak between the fresh water and sea water sides, which side should be at higher pressure to avoid contaminating the engine’s closed cooling system? • What is the job of zinc anodes in contact with seawater, and would painting them help or prevent them from doing that job?

✅ Before You Answer

• Confirm the normal flow arrangement: which side (fresh vs sea water) is usually put through the tubes in marine service and why • Verify the pressure relationship that protects the jacket water system from seawater contamination • Recall that zinc anodes must be exposed metal to work; anything that insulates them from the water stops them from sacrificing themselves

Question 1 of 27070

In an operating diesel engine, which of the following is true concerning a tube and shell type jacket water heat exchanger?

fresh water circulates through the tubes and sea water around the outside of the tubes.

jacket fresh water pressure should always be greater than the sea water pressure.

zinc anodes installed in the heads should always be painted.

all of the above

Question 1 / 270705eccefa2bacbc34ba4d47a2b

Question 1 of 270705eccefa2bacbc34ba4d47a2b

In an operating diesel engine, which of the following is true concerning a tube and shell type jacket water heat exchanger?

Back

Question 1 of 27070

In an operating diesel engine, which of the following is true concerning a tube and shell type jacket water heat exchanger?