Exam Question
(a) Explain briefly the procedure for maintaining vertical shaft of a centrifuge (purifier); name the parts with simple sketch. (12)
(b)Briefly explain what is the purpose of gravity disc in a purifier? (4)
Class 4 (4th Engineer)
MEP
📅 Jul 2022
Reference Answer
### (a) Procedure for Maintaining Vertical Shaft of a Centrifuge (Purifier)
#### **Introduction**
The vertical shaft assembly is a critical component of a centrifugal purifier. Its primary function is to support the entire weight of the bowl assembly and transmit the rotational drive from the horizontal motor shaft (via a worm gear and pinion) to the bowl, enabling it to rotate at very high speeds (e.g., 6000-10,000 RPM). Proper maintenance is paramount to ensure balanced rotation, prevent excessive vibration, avoid catastrophic failure, and maintain separation efficiency.
The routine maintenance is typically scheduled at intervals of **8000 operating hours** or as per the manufacturer's planned maintenance system.
#### **Introduction**
The vertical shaft assembly is a critical component of a centrifugal purifier. Its primary function is to support the entire weight of the bowl assembly and transmit the rotational drive from the horizontal motor shaft (via a worm gear and pinion) to the bowl, enabling it to rotate at very high speeds (e.g., 6000-10,000 RPM). Proper maintenance is paramount to ensure balanced rotation, prevent excessive vibration, avoid catastrophic failure, and maintain separation efficiency.
The routine maintenance is typically scheduled at intervals of **8000 operating hours** or as per the manufacturer's planned maintenance system.
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