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 (6)
(c) Explain how the oil can be monitored by ships staff (4)
Class 4 (4th Engineer)
MEP
📅 Aug 2023
Reference Answer
### (a) Sources for Contamination of the Hydraulic System (6 Marks)
Contamination in a hydraulic system is any foreign material or substance that is not part of the original fluid. The primary sources can be categorised as externally ingested, internally generated, or introduced during maintenance.
1. **External Ingress - Solid Particulates**: Abrasive particles like dust, sand, and paint flakes from the deck environment enter the system. This typically occurs through:
* **Cylinder Rod Seals**: As hydraulic rams (e.g., on cranes) extend and retract, worn or damaged rod seals can draw in atmospheric contaminants.
Contamination in a hydraulic system is any foreign material or substance that is not part of the original fluid. The primary sources can be categorised as externally ingested, internally generated, or introduced during maintenance.
1. **External Ingress - Solid Particulates**: Abrasive particles like dust, sand, and paint flakes from the deck environment enter the system. This typically occurs through:
* **Cylinder Rod Seals**: As hydraulic rams (e.g., on cranes) extend and retract, worn or damaged rod seals can draw in atmospheric contaminants.
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