'Dishwasher' drain plumbing


I want to drain a small pump through an existing sink drain in the basement. There is a stubout for an extra sink that was not built. The pump is rated at 800 gph, but I doubt that it is anywhere near that given it's size. The pump will not drain more than 20 gallons at a time. But my concern is that this small amount will overcome the existing plumbing and start flowing out the nearest sink hole. There will not be enough volume to do any flooding, but any ideas for countermeausres would be appreciated. I undertsand I will need some sort of vent for my dishwasher drain?
TIA.
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Here's what I might do in this situation.....but first ...
If there is a sink stub out, isn't there already a vent?
I'd check the drain capacity with a garden hose (at my house 10gpm+). If the drain takes the hose output on a continuous basis, I'd call it good & forget about doing anything else
OR
I'd install a laundry sink & drain the dishwasher into it, the sink would act as a buffer and fill up if the drain cannot handle the flow.
If there isn't a vent already there, install an air admittance valve (a "mechanical vent")
http://www.plumbingstore.com/autovent.html
easier than running a vent line to the roof.
cheers Bob
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