Exam Question
Describe a three element feed water controller (i.e regulator) measuring steam flow, drum level and feed water flow and explain how a unity relationship is maintained between the three variables.
Class 2 (2nd Engineer)
MEKM
📅 Sep 2025
Reference Answer
In modern high-capacity water-tube boilers, particularly those used in marine propulsion, maintaining the correct drum water level is absolutely critical. The challenge lies in the fact that drum level is influenced not only by the volume of incoming feedwater and outgoing steam , but also by dynamic effects such as shrink and swell . These phenomena cause rapid changes in indicated water level due to steam bubble formation or collapse, without any actual change in total water content.
To manage this complexity, a three-element feedwater control system is employed.
Three-Element Feedwater Control System
This is an advanced automatic control system designed to continuously monitor and balance three critical variables :
To manage this complexity, a three-element feedwater control system is employed.
Three-Element Feedwater Control System
This is an advanced automatic control system designed to continuously monitor and balance three critical variables :
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