Class 2 (2nd Engineer) MEKG 📅 Jun 2023

Exam Question

With respect to refrigeration gases used on-board vessels, answer the following:

(a) Explain Ozone Depleting Potential (ODP) and Global warming potential (GWP) of conventional refrigerant gases. (6)

(b) Name the alternate refrigerant gases available and being used onboard. (5)

(c) What steps are taken to minimize the release of refrigerant gases from the plant during normal operation and maintenance activities. (5)

Reference Answer

### (a) Ozone Depleting Potential (ODP) and Global Warming Potential (GWP)
#### Ozone Depleting Potential (ODP)
ODP is a numerical scale that quantifies the potential of a chemical substance to destroy the stratospheric ozone layer, relative to a reference substance. It is a critical environmental metric governed by the **Montreal Protocol**.
* **Definition**: ODP is the ratio of the global ozone depletion caused by a unit mass of a given substance to the ozone depletion caused by the same mass of the reference substance, Trichlorofluoromethane (CFC-11 or R-11).

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