Class 4 (4th Engineer) MEKG 📅 Jun 2025

Exam Question

With reference to the marine boiler operation, answer the following:

(a) What do you understand by 'accumulation of pressure' test? Explain. (8)

(b) Why is a Boiler water circulating pump required for ships fitted with an Exhaust gas Economiser? Explain with a line diagram. (8)

Reference Answer

### Part (a): Accumulation of Pressure Test (8 Marks)
#### 1. Definition and Purpose
The 'Accumulation of Pressure' test is a critical mandatory survey conducted on a boiler to verify the relieving capacity of its safety valves. The primary purpose is **not** to test the set pressure (lifting pressure) of the valves, but to ensure that they can discharge steam at a sufficient rate to prevent the boiler pressure from rising to a dangerous level when the boiler is operating at its maximum firing rate with all steam outlets closed. It is a dynamic test of the entire overpressure protection system's capacity.
As cited in the reference material, the purpose is:

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