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HIGHAI leedback control. The set point on the P-controller (PC) is 20 psig, and at stendy-state the controller output signal is 12 mA. The controller output signal is sent to a current-to-pressure transducer (KIP) in order to adjust the air-operated control valve on the exit line. The transmitter (PT) has a calibrated input range of 0-50 psig, a 4-20 mA output range and negligible time pressure constant. (a) What is your recommendation for the control valve? Fail-open or fail-close? Air-to-open or air-to- closc? Explain the reasons for your choice. (b) Should the proportional controller be direct-acting or reverse-acting for safe operation of the process? Explain your reasons for your selection. (c) The controller gain setting is Ke =2.0 If the gas surge tank pressure suddenly increases to 25 psig, calculate the controller output signal in units of mA immediately after the pressure increase.

HIGHAI leedback control. The set point on the P-controller (PC) is 20 psig, and at stendy-state the controller output signal is 12 mA. The controller output signal is sent to a current-to-pressure transducer (KIP) in order to adjust the air-operated control valve on the exit line. The transmitter (PT) has a calibrated input range of 0-50 psig, a 4-20 mA output range and negligible time pressure constant. (a) What is your recommendation for the control valve? Fail-open or fail-close? Air-to-open or air-to- closc? Explain the reasons for your choice. (b) Should the proportional controller be direct-acting or reverse-acting for safe operation of the process? Explain your reasons for your selection. (c) The controller gain setting is Ke =2.0 If the gas surge tank pressure suddenly increases to 25 psig, calculate the controller output signal in units of mA immediately after the pressure increase.

Introduction to Chemical Engineering Thermodynamics
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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A gas surge tank shown below is under proportional feedback control. The set point on the P-controller (PC) is 20 psig, and at steady-state the controller output signal is 12 mA. The controller output signal is sent to a current-to-pressure transducer (KIP) in order to adjust the air-operated control valve on the exit line. The pressure transmitter (PT) has a calibrated input range of 0-50 psip, a 4-20 mA output range and negligible time constant. (a) What is your recommendation for the control valve? Fail-open or fail-close? Air-to-open or air-to- close? Explain the reasons for your choice. (b) Should the proportional controller be direct-acting or reverse-acting for safe operation of the process? Explain your reasons for your selection. (c) The controller gain setting is Ke = 2.0 1If the gas surge tank pressure suddenly increases to 25 psig, calculate the controller output signal in units of mA immediately after the pressure increase. PT PC Kr Gas Out Gas In Gas Surge Tank
Transcribed Image Text:A gas surge tank shown below is under proportional feedback control. The set point on the P-controller (PC) is 20 psig, and at steady-state the controller output signal is 12 mA. The controller output signal is sent to a current-to-pressure transducer (KIP) in order to adjust the air-operated control valve on the exit line. The pressure transmitter (PT) has a calibrated input range of 0-50 psip, a 4-20 mA output range and negligible time constant. (a) What is your recommendation for the control valve? Fail-open or fail-close? Air-to-open or air-to- close? Explain the reasons for your choice. (b) Should the proportional controller be direct-acting or reverse-acting for safe operation of the process? Explain your reasons for your selection. (c) The controller gain setting is Ke = 2.0 1If the gas surge tank pressure suddenly increases to 25 psig, calculate the controller output signal in units of mA immediately after the pressure increase. PT PC Kr Gas Out Gas In Gas Surge Tank
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