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Class 1 (Chief Engineer) Engineering Management 📅 Jan 2021

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 shoudl 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 in Starting Air Receivers
Corrosion in large starting air receivers predominantly occurs in specific locations due to the accumulation of corrosive agents derived from the air compression process. As a surveyor, I would inspect the following areas with particular scrutiny:
**Locations of Corrosion:**
* **Bottom of the Receiver:** This is the most common area for severe corrosion. It acts as a sump where condensed water, emulsified compressor lubricating oil, and solid contaminants naturally settle due to gravity.

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