Study on the effects of different proportional values on gas pressure control

Gas pressure system is self-regulating process that is fast and noisy. This study is carried out to determine the process characteristics, mode of control and the effects on response curve when three different proportional (P) values are implemented into a gas pressure control system. Reformulated tangent method and Ziegler-Nichols tuning rules are used to determine the process characteristics and mode of control. Both of these methods are done based on the resulting graphical response from conducting open loop test. In addition, the resulting graphical response from load disturbance test is used to analyse the effects of proportional (P) values. As a result, , 0.0355 1/s response rate, 1.3043 s time dead and 32.3478 s time constant are obtained. From the tuning rule, 4.9599 proportional (P) value and 4.3433 s integral (I) value are determined. Lastly, the process took 79.30 s to become stable when an increased proportional (P) value is used, 59.35 s when a decreased value is used and 63 s when there are no changes in proportional (P) value. In conclusion, higher proportional (P) value took longer time for the process to stabilize.