Exam Question
With reference to hydraulic deck machinery:
(a) State the sources for contamination of the system (6)
(b) Describe possible effects due to contamination (5)
(c) Explain how ships staff can monitor the oil. (5)
Class 4 (4th Engineer)
MEP
📅 Sep 2022
Reference Answer
### (a) Sources for Contamination of the Hydraulic System
Contamination is the primary cause of malfunction and failure in hydraulic systems. The sources are varied and can be categorized as either built-in, internally generated, or externally introduced.
1. **Water Ingress:** This is a significant contaminant in the marine environment.
* **Direct Ingress:** Entry through worn or damaged ram seals on deck actuators (e.g., crane cylinders, mooring winch brakes), pump shaft seals, and tank breather vents, especially during heavy weather or deck washing.
Contamination is the primary cause of malfunction and failure in hydraulic systems. The sources are varied and can be categorized as either built-in, internally generated, or externally introduced.
1. **Water Ingress:** This is a significant contaminant in the marine environment.
* **Direct Ingress:** Entry through worn or damaged ram seals on deck actuators (e.g., crane cylinders, mooring winch brakes), pump shaft seals, and tank breather vents, especially during heavy weather or deck washing.
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