Class 2 (2nd Engineer) MEKM 📅 Jan 2018

Exam Question

Draw a line diagram of a complete feed water system for an auxiliary boiler, labeling all the principal items and showing the direction of flow in all lines.

Explain how the feed supply to the boiler is regulated.

State what means are provided to prevent oil contamination of the feed water

Reference Answer

(a)
(b) Regulating Feed Supply
The feed supply to the boiler is regulated by a level transmitter connected to the boiler drum. This transmitter measures the current water level and sends a signal to a controller. The controller compares this measured value to a pre-set value (the desired water level). The output from the controller, which uses a flapper and nozzle mechanism , is sent to one of two feed regulators: a 7k line regulator for low-demand operation and an 18k line regulator for high-demand operation.
When the boiler is operating in low mode (7k) , the 7k controller is active and the 18k controller is completely shut. In this mode, the economizer pumps are used.

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