Class 2 (2nd Engineer) MEKG 📅 Jan 2023

Exam Question

With respect to refrigeration gases used onboard vessels, answer the following

(a) Explain ozone depleting potential of conventional refrigerant gases

(b) Name the alternate refrigerant gases available and being used onboard.

(c) Explain the steps you will take to ensure that release of refrigerant gases from the plant is minimized during normal operation and during maintenance activities.

Reference Answer

### (a) Ozone Depleting Potential of Conventional Refrigerant Gases
Ozone Depleting Potential (ODP) is a numerical scale that quantifies the potential of a chemical substance to destroy the stratospheric ozone layer, relative to a reference substance. The internationally accepted reference is Trichlorofluoromethane (CFC-11 or R-11), which is assigned an ODP of 1.0.
**1. Mechanism of Ozone Depletion:**
* **Chemical Composition:** Conventional refrigerants, such as Chlorofluorocarbons (CFCs) and Hydrochlorofluorocarbons (HCFCs), contain chlorine and/or bromine atoms.

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