Class 2 (2nd Engineer) MEKM 📅 Sep 2022

Exam Question

(a) Describe, with the aid of a sketch, the arrangement of the gas and liquid fuel systems at the cylinder of a dual fuel 4-stroke engine, stating the input and output

signals at the controller

(b) Describe the arrangement of the gas fuel piping system used for a 4-stroke dual fuel engine, stating the safety features incorporated

Reference Answer

In a dual-fuel 4-stroke engine, both gas (usually natural gas) and liquid fuel (usually diesel) can be used. The engine operates primarily on gas but uses liquid fuel for ignition (in the case of compression ignition). Here's a breakdown of the arrangement and the role of the gas and liquid fuel systems:
Fuel System Arrangement:
Gas Fuel System: Gas Supply Line: Natural gas is delivered to the engine through a pressurized pipeline.
Gas Filter and Regulator: The gas passes through a filter and a regulator to reduce the pressure to a level suitable for the engine.

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