Answer / sathiskumar

FLOW calc:
flow is directly proportional to the square root of dp. this
is the actual technique currently we are following. but how?
normally for all the primary sensing element such as
orifice, Venturi there is a graph available from the
developer, which shows the values between dp vs flow graph.
based on this graph from the manufacturer the
instrumentation engineer will assign the range of dpx
accordng to the flow value of the curve.

in the boiler in the main steam line and its bypass line and the startup vent vales are only motorised valves why cant we use other types of valves such as pneumatic.

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