The modeling is done as per following philosophy;
The pump is delivering 200 cu.m/h water in two Overhead tanks (Top Filled). The pump is having a head of 35 m of H2O. But, I am surprised to see that the pipe towards tank 2 is not being able to carry any flow in this system. Please suggest the mistake that may be detected in this model.
One more thing I want to draw your attention that, while estimating the pump head by replacing the pump by two nodes (One with positive demand & other with the negative demand of same magnitude), the head comes out to be 35 m of H2O which is quite high as compared to as calculated by means of the Hazen William formula. Please throw some light on the design basis of pump head estimation by the above referred method (As Calculated by Water Gems) .
Also, we have tried to use Darwin designer in this connection. But, improvement of flow condition could not be achieved. The feasibility check unfortunately failed. While designing we generally provide some terminal head of 5 m at the tank inlet to nullify any unforeseen losses of head, how these terminal head can be implemented in this model. Please provide some guideline to design a new piping layout for piped water supply terminating with multiple no.s top filled over head storage tank while limiting the flow velocity in the range of 0.6 to 2.5 m/s.
The model is attached as zip file.
Regards,
Sujoy De
Bentley Mail 04-08-2016.rar
Answer Verified By: Sushma Choure