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Answer Posted / malik shams-ul-arfeen
3 element control on boiler controls Drum Level through
control applied on feed water control valve.
3 elements are
1) Drum Level (Master)
2) Feed Water Flow.
3) Steam Flow.
Formula applied on it is. C = A - B.
Where,
C = Control output to Feed Water CV.
A = Feed Water Flow
B = Steam Flow.
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