Oil Skimmer tank design - Nutshell filter Design

[mattegm]

Goodmorning,
i have to design a oil skimmer tank upstream an hydrocyclone package.

I have 100 m3/hr of process water containing 1000 ppm oil (max) that enters an oil skimmer tank in order to eliminate in first stage a part of the oil that is contained in the water ( just to reduce if possible, the quantity of oil going to hydrocyclones).

I have a preliminary P&ID (attached) in wich is clear that:
- the water/oil enters the tank (P=2 barg)
- the oil on the surface of the water is collected in a "oil skim chamber" and directed to nutshell filters
- The "partially deoiled water" is directed to hydrocyclones with a booster pump

Can anybody help me to design this kind of item?First of all, i think i can estimate a residence time (i.e. 20 minutes) but i don't know how to design the internal items.

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Thanks