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.

I saw one P&ID 6" control valve has been connected with 8" process line, and 2" valve also connected in parallel with 6" valve. why the 2" valve connected in parallel, Is there any technical reason. please clarify. With Regards-Kittu

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