Hello All,
I have a question regarding Flow Control. Below is the scenario:
I have a level transmitter and flow meter to open/close control valve at the outlet. When level reaches certain value (high) I want to open the control valve and maintain XX barrels per day of flow. When level reaches certain value (high high) I want to open the control valve and maintain higher XX BPD of flow. When level reaches certain value (low), I want to close the valve.
For this scenario, I do not see a need for cascade loop control since I am not trying to maintain any level. I will only need flow based PID control loop.
I am getting flow using a flow meter that outputs certain frequency to give out flow rate. So when I get that flow rate that is current value, is this value in seconds meaning barrels per second currently flowing? What set-point should I set to flow control PID since my required set-point is in barrels per day and the flow-rate I get is in seconds?
As far as logic implementation, do I need to look at the totalizer and keep track of accumulated flow so I will be looking at the accumulated flow and required barrels per day flow and adjust my output so that at the end of the day I get XX barrels per day.
Thanks.
I have a question regarding Flow Control. Below is the scenario:
I have a level transmitter and flow meter to open/close control valve at the outlet. When level reaches certain value (high) I want to open the control valve and maintain XX barrels per day of flow. When level reaches certain value (high high) I want to open the control valve and maintain higher XX BPD of flow. When level reaches certain value (low), I want to close the valve.
For this scenario, I do not see a need for cascade loop control since I am not trying to maintain any level. I will only need flow based PID control loop.
I am getting flow using a flow meter that outputs certain frequency to give out flow rate. So when I get that flow rate that is current value, is this value in seconds meaning barrels per second currently flowing? What set-point should I set to flow control PID since my required set-point is in barrels per day and the flow-rate I get is in seconds?
As far as logic implementation, do I need to look at the totalizer and keep track of accumulated flow so I will be looking at the accumulated flow and required barrels per day flow and adjust my output so that at the end of the day I get XX barrels per day.
Thanks.