Class 4 (4th Engineer) SSEP 📅 May 2023

Exam Question

(a) Describe with a sketch the Dry powder portable fire extinguisher, its working principle and the type of inspections to be carried out and its periodicity. (10)

(b) Suggest why in certain instances carbon dioxide and dry powder can be more of hazard than hein in untutored hands. (5)

Reference Answer

### (a) Dry Powder Portable Fire Extinguisher
#### Description and Construction
A Dry Powder (or Dry Chemical Powder - DCP) portable fire extinguisher is a first-response firefighting appliance designed for multi-class fire risks. The type described is a cartridge-operated model, common in marine environments due to its reliability.
* **Body:** A robust cylinder constructed from solid drawn steel. To prevent internal corrosion from the powder, which can be hygroscopic, the interior is typically zinc-coated or plastic-lined.

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