Class 2 (2nd Engineer) SC&S 📅 Sep 2023

Exam Question

With regard to the carriage of crude oil and its associated products:

(a) (i) Sketch and describe the operation of an explosimeter suitable for testing pump rooms or tank

(ii) state why false readings are likely to be given by the explosimeter.

(b) State the publication that give guidance on safety.

Reference Answer

(a) (i) An Explosimeter is used to test for the presence of flammable gases or vapors in spaces like pump rooms or cargo tanks.
Consists of a Wheatstone bridge circuit powered by a battery.
Contains three fixed resistances and one resistance that is a hot filament within the combustion chamber.
A galvanometer measures the current flow in the circuit and is scaled to indicate gas concentration as a percentage of the Lower Flammable Limit (LFL) or in parts per million (ppm).

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