Exam Question
Describe actions to be taken with reasons for the following malfunction on auxiliary boiler
(a) Pilot burner does not fire (4)
(b) Efficiency of boiler is low (4)
(c) Low water level in boiler (4)
(d) Flame failure. (4)
Class 4 (4th Engineer)
MEP
📅 Feb 2023
Reference Answer
### (a) Pilot Burner Does Not Fire
**1. No Ignition Source:**
* **Action:** Check the ignition transformer for power supply. Inspect ignition electrodes for cleanliness (free from carbon), correct gap (typically 2-4 mm), and integrity of porcelain insulators (no cracks).
* **Reason:** A faulty transformer provides no high-voltage spark. An incorrect gap, fouled tips, or a cracked insulator will prevent a strong, consistent spark from forming and jumping to the earthed burner components to ignite the fuel spray.
**1. No Ignition Source:**
* **Action:** Check the ignition transformer for power supply. Inspect ignition electrodes for cleanliness (free from carbon), correct gap (typically 2-4 mm), and integrity of porcelain insulators (no cracks).
* **Reason:** A faulty transformer provides no high-voltage spark. An incorrect gap, fouled tips, or a cracked insulator will prevent a strong, consistent spark from forming and jumping to the earthed burner components to ignite the fuel spray.
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