Exam Question
Describe the following turbocharger cleaning operations:
(a) Turbine side water washing. (6)
(b) Turbine side dry cleaning. (5)
(c) Blower side water washing. (5)
Class 4 (4th Engineer)
MEP
📅 Oct 2025
Reference Answer
### (a) Turbine Side Water Washing (6 Marks)
**1. Purpose & Principle:**
Turbine side water washing is a corrective maintenance procedure performed to remove accumulated deposits of soot, carbon, unburnt fuel oil additives (e.g., Vanadium, Sodium compounds), and ash from the nozzle ring and turbine blades. This fouling reduces the nozzle throat area and alters blade profiles, leading to a decrease in turbine efficiency, a drop in scavenge air pressure, and an increased risk of turbocharger surging.
The cleaning action is based on two principles:
**1. Purpose & Principle:**
Turbine side water washing is a corrective maintenance procedure performed to remove accumulated deposits of soot, carbon, unburnt fuel oil additives (e.g., Vanadium, Sodium compounds), and ash from the nozzle ring and turbine blades. This fouling reduces the nozzle throat area and alters blade profiles, leading to a decrease in turbine efficiency, a drop in scavenge air pressure, and an increased risk of turbocharger surging.
The cleaning action is based on two principles:
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