Class 2 (2nd Engineer) MEKG 📅 Aug 2025

Exam Question

With reference to auxiliary boiler safety valves:

(a) Describe, with the aid of a sketch, the safety valves for an auxiliary boiler.

(b) Identify, with reasons, the parts that require particularly close attention during overhaul;

Reference Answer

### (a) Description of Auxiliary Boiler Safety Valves
An auxiliary boiler is fitted with at least two safety valves of an approved type. The most common type is the **Improved High-Lift, Spring-Loaded Safety Valve**. This design ensures a rapid, full opening (a 'pop' action) to discharge a large volume of steam quickly, and a positive, sharp reseating action to minimize steam loss.
#### Construction
The main components are housed within a cast steel valve chest with an inlet connected to the boiler steam drum and an outlet directed to the atmosphere via a waste steam pipe.

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