Induced Gas Flotation Retention Time & Multi-Cell Sizing Calculator

Size horizontal multi-cell mechanical induced gas flotation (IGF) units, verify 4-chamber series residence time (3–5 min), and calculate oil removal efficiency.

Produced Water Flow & Cell Architecture

Water Inflow Rate Q (m³/h):

Number of Flotation Cells in Series:

Target Total Residence Time (min): API 421 benchmark: 3.5 to 5.0 minutes

Inlet Oil Concentration (ppm):

Single Cell Per-Pass Efficiency (%): Typical per-cell recovery: 60% to 70%

Gas Eduction Ratio (Gas Vol / Liq Vol):

IGF Vessel Capacity & Effluent Quality

Total Active Liquid Volume:

—

Overall Oil Removal Efficiency:

—

Volume per Individual Chamber:

—

Treated Water Oil Out:

—

Chamber Residence Time:

—

Total Educed Gas Flow:

—

Recommended Tools & Equipment

Tested hardware and components for high reliability

100% Free Tool Zero Sign-Up

Frequently Asked Questions

How does an Induced Gas Flotation (IGF) differ from Dissolved Gas Flotation (DGF)?

IGF utilizes mechanical rotating impellers or eductors to physically suck and shear gas from the vessel vapor space, producing 100–300 µm bubbles with 3–5 minute residence times. DGF dissolves gas under high pressure (5–6 bar) in a saturation vessel, releasing ultra-fine 30–70 µm microbubbles upon pressure letdown.

Why are 4 cells in series considered the offshore industry standard for IGF?

Four cells in series achieve 95% to 98% cumulative oil removal efficiency while guarding against hydraulic surging. Even if one impeller fails or is shut down for maintenance, the remaining three cells continue to provide sufficient polishing to meet discharge limits.