Class 2 (2nd Engineer) MEKG 📅 Feb 2023

Exam Question

With reference to the carriage and pumping of liquified gas cargo:

(a) Sketch a suitable pumping system labeling the component parts

(b) State, why submerged hydraulically driven pumps are not used

(d) State, how the risk of fire and explosion in cargo tanks is obviated both in the loaded and discharged condition.

Reference Answer

### (a) Pumping System for Liquefied Gas Cargo
A common system for pumping liquefied gas is the deepwell pump, which is a vertical multi-stage centrifugal pump. Each cargo tank is equipped with one or more of these pumps.
**System Description and Component Parts:**
1. **Electric Motor:** Located on the main deck, outside the cargo tank. This prime mover is typically explosion-proof (Ex 'd' rated) to prevent ignition of any flammable vapors on deck. Its location outside the tank keeps it away from the cryogenic temperatures and allows for easy access and maintenance.

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