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Explain Split Range Control In Control Valve Briefly.
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Answer Posted / ferdinand
Split range control in process operations point of view, generally used in pressure control, flow and level control also in controlling temperature.
for example a split range control application for pressure control. the input coming from pressure transmitter is processed by the pressure controller then relays the output split between the two control valves to modulate the pressure of a certain vessel.
There are many variations of split controller, like for expmaple valve A at 49% start to modulates the opening to 0% full open while the other valve starts to modulate at 51% opening to 100% full open. for this example both valve are close at 50%. at 50% it means the set point and the process value are the same so the valves are both close. on this particular example, one valve normally supplies the pressure while the other releases it normally goes to the flare system or other systems that serves the purpose.
The accuracy of the control is due to incorporations of PID. the proportional, Integral and the derivatives that in laymans terms it considers the present, the future and the past in predicting the relays in order to control.
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Q1: Consider part of a control loop, which excludes the transmitter, consisting of a process, a controller and a control valve which may be represented by two dead times of 0.5 min each and three exponential lags of 0.8 min., 1.0 min. and 1.5 min. respectively. We wish to express this system as an overall first order plus dead time (FOPLD) model ie gain, time constant and process dead time. (We will see later that this is often done, to simplify controller tuning). For this exercise, gain is considered to be 1.0. (A) If the transmitter is a flow transmitter whose behaviour can be described by a dead time of 0.2 min. and an exponential lag of 0.5 min. in terms of the overall dead time and overall first order lag how can the system behaviour be approximated ? Overall dead time = Overall time constant = (B) If the transmitter is a temperature transmitter with a temperature sensor in a protecting well whose behaviour can be described by a dead time of 0.7 min. and an exponential lag of 15 min. how can the overall system behaviour be approximated now? Overall dead time = Overall time constant =
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