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Modeling an oil separator in SewerCAD

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.

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  • 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.


    Regards,

    Jesse Dringoli
    Technical Support Manager, OpenFlows
    Bentley Communities Site Administrator
    Bentley Systems, Inc.

Reply
  • 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.


    Regards,

    Jesse Dringoli
    Technical Support Manager, OpenFlows
    Bentley Communities Site Administrator
    Bentley Systems, Inc.

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