Lesson 8 - Process Control and Instrumentation End of Unit SAQ
This lesson allows you to test yourself on the material covered in the Process Control and Instrumentation unit and determine the level to which you have met the learning outcomes.
Self-Assessment Questions
1. ** How would you combine valve actuators and feedback on open/closed positions in order to safeguard a process?
2. *** You have been asked to control the dilution water addition that is added in-line on route to the bright beer tank.
a) Name two control configurations you could consider using to achieve this. What are the advantages and disadvantages of each?
b) What are the instrumentation and control elements required in each system? Draw a diagram of them.
c) What type of PID control would you recommend for each of these?
3. *** You have a dilution water tank that you would like to keep a minimum of 50% full. This is fed by two D-plants (deaerated water producing plants). Bearing in mind that starting up and shutting down a D-plant leads to energy losses; how would you control the level in the tank if:
a) The D-plants run at a fixed speed?
b) The D-plants can be run at a speed between 50-100%?
4. *** What are the effects of increasing controller gain, integral time constant, and derivative time on P, PI, and PID controllers? Use diagrams to help explain this.
5. *** What would be important considerations and choices to make if you looked at your automation system as a whole? How do they interact with each other? You can base your answer on the hierarchy of control.