In closed loop control there are several “blocks” used to
show the interactions between the process and the control
system. These blocks are referred to as the “process” and
the “controller.” Describe the relationship between these
two blocks when creating a well tuned control loop.
Answer / tukaram
Controller: compare o/p with refferance i/p, manipulate & modify the actuating signal.
process:process the system in error free manner.
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Calculate the maximum pressure drop that can be allowed to occur across a control valve, so that we can prevent cavitation / flashing from occurring. Use the following formula: Δ P allow = Km (P1 – PvapourA) where, Δ P allow - the maximum allowable differential pressure for sizing purposes, or terminal pressure drop; Km- the valve recovery coefficient from the manufacturer’s catalogue; P1 - absolute inlet fluid pressure; PvapourA - absolute fluid vapour pressure at the inlet temperature; Use Atmospheric pressure = 101.3 kPa, P1 = 1200 kPa(g), PvapourA = 4 kPa, KM = 0.72
how to caluculate flow by using transmitter?tell me plz I am eagerly waiting for your reply..
2 Answers Agi Glaspac, Reliance Power,
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