Hello:
I have a Watercad (Connect Edition) model where one of my tanks will fill up to about 95% full, and then continue to slowly fill up over time even though i have a FCV before the tank that should prevent any flow from entering the tank when it reaches the 95% full mark.
I will submit the model files for your reference after this post is created.
The tank in question is TANK-B. Run the EPS Run scenario, and view a graph of water level of the tank to see results I mentioned.
Thanks,
Jose
thanks for the input.
Although, my question about floating tanks was between Tank-C and Tank-A. I see that Tank-B and Tank-C are isolated from each other when the pump is off.
Typically, I would run this scenario for just 72-hours, to see general operation of the tanks and ensure they are cycling as expected. But yes, I set the simulation time much longer to demonstrate the numerical noise issue to try and understand better what was happening.
I do want to mention that running the simulations in excess of 100-days is common for me when evaluating Water Age. We typically like to try and run the simulation time as long as needed for water age in a tank to reach its max (when the graph of calculated water age levels out).
Apologies, I missed that you were referring to TANK-A.
For TANK-A, it fills and drains based on the controls as pumps PMP-TALIMAN-BOOST and PMP_E35 turn on and off.
For TANK-C, once the control closes it's FCV, it can only drain through the parallel check valve, which remains closed for most of the simulation because the downstream hydraulic grade is almost always higher. The downstream HGL is higher because PMP-TALIMAN-BOOST turns on at times, and when it is not on, TANK-A is at a higher HGL. In both cases they cause the check valve to remain closed.
Regards,
Jesse DringoliTechnical Support Manager, OpenFlowsBentley Communities Site AdministratorBentley Systems, Inc.
Ok, thank you for the input. This answers my question.