Class 2 (2nd Engineer) SSEP 📅 Jan 2025

Exam Question

During loading of a petroleum tanker, the incoming cargo forces out from the tank its previous atmospheric contents (air-vapour-inert gas)

(a) Explain:

(i) The dangers of venting during the loading via open tank hatches (5)

(ii) Why the pressure / vacuum valve is not used venting (5)

(b) Sketch and describe a patent high velocity vent and state why such device is used. (10)

Reference Answer

(a) (ii) Dangers of Venting During Loading via Open Tank Hatches:
Fire and Explosion Hazard: Open tank hatches allow the uncontrolled release of flammable hydrocarbon vapors, which can form explosive mixtures with air.
Health Hazards: Crew members can be exposed to harmful and toxic vapors, leading to respiratory problems or other health issues.
Environmental Pollution: Uncontrolled venting releases volatile organic compounds (VOCs) into the atmosphere, contributing to air pollution.

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