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Class 1 (Chief Engineer) Engineering Management 📅 Jun 2022

Exam Question

With reference to surveying of large starting air receivers:

(a) Explain where corrosion is likely to occur and state why it occurs in these regions

(b) State how the incidence of corrosion in air receivers might be minimized

(c) If serious corrosion is detected in a starting air receiver and that receiver must be used explain how you, as Chief Engineer, would determine the maximum pressure to which the receiver should be subjected

(d) State the further action a Chief Engineer must take upon discovering such air receiver corrosion.

Reference Answer

### (a) Corrosion Locations and Causes
Corrosion in large starting air receivers is a significant safety concern. It primarily occurs in specific locations due to the accumulation of corrosive agents derived from the compressed air system. The primary agents are water, acidic compounds from combustion by-products and oil breakdown, and contaminants from the intake air.
**Likely Locations of Corrosion:**
* **Bottom of the Receiver:** This is the most common area for severe corrosion. Gravity causes water, emulsified oil, and solid contaminants to settle and collect here, creating a permanent electrolyte pool in contact with the steel shell.

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