Class 2 (2nd Engineer) SSEP 📅 Mar 2018

Exam Question

With reference to an oil/water separator:

(a) (i) Sketch such a device. (5)

(ii) Describe the passage of oil water mixture from the delivery of pump to the outlets of the separator. (5)

(b) How does oil density and temperature affect the separation of oil? (5)

(c) State how the movement of oil on board ship or its discharge and the discharge of oily-bilge or ballast water overboard is recorded. (5)

Reference Answer

(a)
(b) Oil density and temperature play significant roles in separation processes, especially in oil-water separation (OWS) systems:
Density Difference: Oil and water have different densities. Oil is typically less dense than water. In an OWS system, the less dense oil floats on top of the denser water. By exploiting this density difference, separation can be facilitated. Adjusting the density of the medium or using additives can further enhance this separation.
Temperature Effects: Temperature influences the viscosity of oil. As temperature increases, the viscosity of oil decreases, making it easier to separate from water. Additionally, temperature changes can affect the solubility of components in the oil-water mixture, facilitating the separation

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