worst scenario

Hello Doan,

Could you explain what do you mean by minimum and maximum water capacity? Are these minimum and maximum flow in the pipeline?

What event are you trying to simulate for water hammer? Pump shutdown, sudden valve closure?

Have you tried observing the transient results under the Transient Results Viewer tab? Do you see an air pocket formation in your pipeline?

Generally water hammer occurs when there is sudden flow interruption causing a pressure wave to move back and forth from your high point to your source which gives rise to vapor formation. For this a suitable surge mitigation device such as an air-valve, surge tank, hydropneumatic tank etc. is to be placed to counter the pressure wave. What surge mitigation are you using?

Here is a relevant article which can help you understand viewing transient results;

Using Transient Results Viewer animations for visualizing a transient simulation

We can help you better if you provided some schematic or snapshot of your proposed system?

Hope this helps.

Hello, Yashodhan Joshi !

Yes, they are minimum and maximum flow in the pipeline. My model is treated water pipeline network, so have minimum hours and maximum hours use water.

Pump shutdown is my event to simulate for water hammer.

Im not found air pocket, and i thinks not have water hammer, (max pressure of hammer same same max pressure of epanet at all junc).

I would like to ask is that usually when water hamer occur, in the Max hour will be higher in the min hour?
And should I analyze both Max hours and Mins?

Hello Doan,

This is likely to be system-dependent. What I would do is model both cases. If you are using a EPS run as the initial conditions, you can set the time you want to set the initial start time in the Transient Calculation Options. If you have two models or two scenarios representing the maximum and minimum flows, you could simply compute the transient analysis in HAMMER and see how the results compare. If you have two scenarios for the two cases, you can compare results between scenarios in the Time History graphs of the Transient Results Viewer.

As Yashodhan mentioned, viewing results in the Transient Results Viewer can be very useful in looking at the system. I would recommend generating an animation of the profile so you can see how the pressure changes as the pumps shut down. The time history graphs can show results at a given point in the model for the model run time.

Regards,

Scott

Very Thank you Scott!