Class 4 (4th Engineer) MEKG 📅 Aug 2024

Exam Question

With reference to main air reservoirs:

(a) Explain with line sketch the manner in which mountings are attached to the shell. (6)

(b) Explain why regular internal inspection is advisable (4)

Reference Answer

### (a) Attachment of Mountings to Air Reservoir Shell
**1. Principle of Reinforcement:**
An air reservoir is an unfired pressure vessel, and any opening cut into its shell for mountings (e.g., valves, pressure gauges, access doors) creates a point of high stress concentration. The material removed can no longer carry the stress, leading to a localized increase in stress in the material immediately surrounding the hole. As cited in the provided context, to mitigate this and maintain the vessel's structural integrity, **compensation rings or reinforcing pads** are fitted.
**2. Method of Attachment:**

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