I am using WaterCAD V8i to design a water scheme with over 27000m pipe network and a treatment plant.
I intend to design the treatment plant to run for 8 hours.
I have done the demand pattern using time step extended pipe simulation.
How to i control the pumps to work for 8 hours only?
Hi Jasper,
To control an element for certain time, you need to create a Time based control. There are two types of time based controls, Clock Time and Time from Start. Most of the time, Clock Time is used in WaterCAD/GEMS as it will allow one to change status/settings of an element from/at/to certain time. e.g. Turn pump from 9 AM to 3 PM.
Controls can be created from Components > Controls.
Few Examples:IF Clock Time >= 9 AM AND Clock Time <= 3 PM THEN Pump-1 Status = ON
IF Clock Time >= 10 PM AND Tank-1 HGL < 428 ft THEN Pump-80 Status = ONIF Clock Time <= 3 AM AND Tank-1 HGL >420 ft THEN Pump-80 Status = OFFNote: if you combine the clock time like >10 PM and < 3AM, you will be creating an invalid/unreachable control.
IF Clock Time >= 10 PM OR Clock Time <= 3 AM THEN Pump-80 Status = ONNote: this one is valid because it's using "OR" statement. If you use AND it will never trigger
In KB 59689, you will find a few more examples.Here's you will find more discussions on the Time Based Controlshttp://communities.bentley.com/products/hydraulics___hydrology/f/5925/p/87731/248548.aspx#248548
Thanks
Thanks Akshaya.
I have done what u advised but when i run the analysis, it generates error when the pump stops.
I get the message indicating that the system disconnected because of pump.
also, all other junctions have demands and is disconnected from the reservoir or tank.
All nodes need to be connected to some source (reservoir or tank). If a pump is the only way for water to get from the source to the node and the pump turns off, there is no way to get water to the node. Therefore, the node is considered "disonnected".