1. Without surge protection: in this scenario no user notification error and network is working fine with high negative pressure.
2. With surge protection: In this scenario I have add surge tank near the pump station and validated the network it’s showing a user notification "Combined pump and motor efficiency should be between 30% and 95% inclusive. Check your pump definition."
Hi Digvij,
The efficiency is different depending on the operating point of the pump. In the properties of the pump in question, look at the pump head and flow for the timestep you're using for your initial conditions, then compare that operating point with the graph at the bottom of the pump definition dialog to see what the pump efficiency is. Then, multiply that efficiency times the motor efficiency to get the overall efficiency.
Because the four-quadrant characteristic curves (based on the selection of Specific Speed) used during the transient simulation are developed for pumps at their ‘rated’ values, it is important for the pump to be operating near its best efficiency point for the initial conditions.
If you need further help, please send the model to technical support.
Regards,
Jesse DringoliTechnical Support Manager, OpenFlowsBentley Communities Site AdministratorBentley Systems, Inc.