Deoiling Hydrocyclone Split Ratio & Separation Calculator

Size produced water liquid-liquid deoiling hydrocyclones, determine reject overflow split ratio (1-3%), and estimate D50 cut size.

Operating & Hydraulic Conditions

Total Water Feed Rate Q_feed (m³/h):

Inlet Pressure P_in (bar gauge):

Reject Flow Rate Q_reject (m³/h):

Reject Backpressure P_rej (bar g):

Underflow Clean Water P_under (bar g):

Inlet Oil Concentration (mg/L or ppm):

Oil Density (kg/m³):

Water Density (kg/m³):

Hydrocyclone Performance Metrics

Split Ratio (SR):

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Pressure Drop Ratio (PDR):

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Estimated Cut Size d50:

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Est. Clean Water Oil Out:

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Underflow Water Flow Q_clean:

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Oil Removal Efficiency:

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Frequently Asked Questions

What is the recommended split ratio for produced water deoiling hydrocyclones?

The industry benchmark split ratio is 1.5% to 3.0% of the total feed flow rate. Operating below 1.0% causes the axial oil core to be entrained into the clean water underflow, while exceeding 4.0% overwhelms downstream slop oil recovery systems with excessive water.

Why is Pressure Drop Ratio (PDR) critical in hydrocyclone operation?

PDR balances the fluid pressure between the reject header and the underflow header. A PDR above 1.5 ensures that the central oil vortex continuously moves toward the reject nozzle rather than being pulled out through the bottom clean water outlet.