Answer / 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.

U Can contact at msaarfeen@hotmail.com.

Answer / vijayaprakash

question is not clear?
But i thought this is three element boiler drum level
controller.

this controller inputs having drum level, steam flow and
feed flow . it controls output feed water control valve.

During valve sizing from all calculation you got flow coefficient CV 12,than what it means? like for selecting pressure transmitter if your MAWP is 12 bar than you select a capsule of max. 20 bar which cover your mawp 12 in same way for selecting control valve If CV is 12 than how we use it in selecting valve??????

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