I am modeling a gravity sanitary waste water line that will have an Oil Interceptor installed at one point. What is the correct way to model it in SewerCAD? The analysis will be steady state.
Hello Ali,
What purpose is this Oil Interceptor going to fulfill in SewerCAD hydraulically?
I am asking this because the primary requirement of the Oil Interceptor seems to be to separate grit and oil from the sewage, but I am not sure about the hydraulic effects of this. Is there a certain headloss associated with this unit?
If that is the case you can try and introduce this headloss in some form on SewerCAD.
Regards,
Yashodhan Joshi
I'm interested in modelling the headloss through the structure. I know that I'll have to model it in SewerCAD as a manhole but I'm not sure how to introduce the headloss in the structure. Will using "HEC-22 Energy" headloss method with depressed benching suffice? , or would I use the "Standard" headloss method and try to come up with a reasonable headloss coefficient?
Hi Ali,
The HEC-22 Energy structure loss method is based on the assumption of a standard type of manhole that may or may not have benching, so I do not believe that would be a good match for this situation.
Looking at the PDF here, it looks like this does not operate under pressure, but rather hydraulically acts as a tank with compartments that fill, spill over a weir, and then flow through an outlet pipe into the next compartment. You may still be able to simplify this as a manhole or series of manholes in SewerCAD, possibly with conduit control structures between them to model the headloss through the structure. Or, if an acceptable velocity is modeled through the structure, the Standard structure loss method could be used with an estimated headloss coefficient.
Jesse DringoliTechnical Support Manager, OpenFlowsBentley Communities Site AdministratorBentley Systems, Inc.
I experimented with this a bit and believe that the head loss will occur in the siphon pipes which flow full when they do flow.
You may be better off modeling it with WaterGEMS/WaterCAD..
The model would consist of
1 Junction node inlet flow (if flow is 20 gpm, enter -20 as demand)
2 Short pipe connect junction to first chamber which will be a Tank element
3 Tank would be Has Separate Inlet-True, FiIls from Top-True, Level of inlet is below top of tank but above initial water level.
4 Outlet pipe with the length and diameter set to that of the suction pipe to next chamber
5 Repeat steps 3 and 4 for each chamber
Answer Verified By: Ali Akel
Thank you for the answers.
thank you for the help
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I did some testing on my recommended solution and it didn't work as well as I'd like. The key point is that the HGL at the top of the siphon needs t be accounted for. Instead of the top fill tank, set a PSV with the HGL setting equal to the elevation of the top of the siphon.