Q2
(a) Sketch a line diagram of a mechanical high expansion foam fixed firefighting system suitable for machinery spaces.
(6)
(b) Describe the operation of the system sketched.
(6)
(c) Explain how a mixture of foam making compound and sea water are converted into foam.
(4)
(d) What are the periodic maintenance required on the system.
(4)
Reference Answer
### (a) Line Diagram of a Mechanical High Expansion Foam System A line diagram would illustrate the following key components arranged logically to show the flow from water source to foam discharge: 1. **Sea Water Supply:** A connection from the ship's fire main or a dedicated sea water pump, complete with a main isolating valve. 2. **Foam Concentrate Tank:** A tank containing the high-expansion foam liquid concentrate, fitted with a level indicator, filling connection, and a vent.
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