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Size a control valve to regulate the flow of 50 psig liquid stream. The nominal flow is 1200gpm and the outlet pressure is 45 psig. The density of the liquid is 800 kg/m3. i. Obtain the Cv coefficient for 50% overcapacity. ii. Find the maximum flow through the valve.

Size a control valve to regulate the flow of 50 psig liquid stream. The nominal flow is 1200gpm and the outlet pressure is 45 psig. The density of the liquid is 800 kg/m3. i. Obtain the Cv coefficient for 50% overcapacity. ii. Find the maximum flow through the valve.

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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Control valve(sizing and gain)

Size a control valve to regulate the flow of 50 psig liquid stream. The nominal flow is 1200gpm and the outlet pressure is 45 psig. The density of the liquid is 800 kg/m3. i. Obtain the Cy coefficient for 50% overcapacity. ii. Find the maximum flow through the valve. A control valve is to regulate the flow of a gas with a molecular weight of 44. Process design conditions call for a nominal flow of 45,000 scfh; an inlet pressure and a temperature of 110 psig and 100°F, respectively; and an outlet pressure of 90 psig. i. Obtain the Cy coefficient for 100% overcapacity (assume C= 0.8). ii. Determine the size of valve to be installed in the pipeline. Calculate the gain of the valve which used to regulate the flow of liquid to a distillation column. The pressure drop across the valve is 11 psi, the Cv is 303 gpm/(psi)1/2 and the denstity is 940 kg/m³. i. Consider the valve is a linear valve with 100% overcapacity. i. Consider the valve is an equal percentage valve with rangeability parameter (a= 50). iii. Write down the transfer function for both control valves when the time constant is 4s.
Transcribed Image Text:Size a control valve to regulate the flow of 50 psig liquid stream. The nominal flow is 1200gpm and the outlet pressure is 45 psig. The density of the liquid is 800 kg/m3. i. Obtain the Cy coefficient for 50% overcapacity. ii. Find the maximum flow through the valve. A control valve is to regulate the flow of a gas with a molecular weight of 44. Process design conditions call for a nominal flow of 45,000 scfh; an inlet pressure and a temperature of 110 psig and 100°F, respectively; and an outlet pressure of 90 psig. i. Obtain the Cy coefficient for 100% overcapacity (assume C= 0.8). ii. Determine the size of valve to be installed in the pipeline. Calculate the gain of the valve which used to regulate the flow of liquid to a distillation column. The pressure drop across the valve is 11 psi, the Cv is 303 gpm/(psi)1/2 and the denstity is 940 kg/m³. i. Consider the valve is a linear valve with 100% overcapacity. i. Consider the valve is an equal percentage valve with rangeability parameter (a= 50). iii. Write down the transfer function for both control valves when the time constant is 4s.
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