HydroCad Pump Modeling

[bcarped]

I am modeling a pump in HydroCad.
I do not understand the pump Rating Table.
I have computed a system curve for my pump which shows that as flows increse head increases.
The table seems opposite from this with heads decreasing as flow increases.

Can someone explain this.

 

[psmart]

As you correctly stated, HydroCAD needs the Pump Rating Table, not the system curve. For the pump curve, head will decrease with increasing flow. This info is taken directly from the pump data sheet.

The system curve is automatically calculated and solved based on the discharge parameters you specify.

For details click the help button and see

http://www.hydrocad.net/pumps.htm

Peter Smart
HydroCAD Software

http://www.hydrocad.net

 

[bcarped]

Ok I see this curve on the table and it makes some sense.
In the pump data window there is a pump on input and a pump off.
I can enter the pump on but the pump off window is shaded back and cannot be entered.
How do I enter a pump off if I want to use this feature.

Thank you all.

 

[psmart]

To enable on/off pump switching you need to change to dynamic routing.

Please click help for details. This will answer all your questions...


Peter Smart
HydroCAD Software

http://www.hydrocad.net