CPI / IGF
Corrugated Plate Interceptors (CPI) and Induced Gas Flotation (IGF) systems are an appropriate cost-effective solution for produced water treatment applications where there is little to no available natural pressure in the produced water stream. CPI’s and IGF’s are long standing convention technologies which have been used for many years, typically in onshore oil & gas facilities.
eProcess CPI’s are efficient gravity based tilted parallel plate separators. Free oil rises between the plates until they reach the underside of each multiple plate arrangement where they collect and coalesce. The oil then travels up along the plate to the surface where it is skimmed, collected and removed from the water.
Produced water typically contains dissolved gas, especially at high process pressures. This gas is separated from the produced water stream to allow downstream operations to function properly and to prevent gas flashing to atmosphere during water disposal. The eProcess IGF uses this available gas to float oil droplets that remain in the water phase after deoiler removal. The Degasser-IGF will ensure additional water polishing leading to a further 60 – 80% reduction in oil in water content.
eProcess IGF’s are efficient micro gas bubble generators which attaches to oil or fine solids, and lifts these to the water surface for collection and removal. The IGF vessel is typically arranged as four separate compartments or cells, where the unique eProcess eductor generates finely dispersed gas bubbles into the water stream, with minimum turbulence, and no short-circuiting.
Removal efficiency is influenced by physical characteristics of the incoming stream such as pH, total dissolved and suspended solids, temperature, and the presence of chemicals.
Benefits:
- Handles large range of oil concentrations
- Excellent bubble size control
- Low chemical dosage requirements
- Few moving parts
- Minimal oil skimmings & solids fouling
Applications:
- Onshore oilfield produced water applications
- FPSO’s
- Collection of produced water from multiple streams
- Proven and robust primary & secondary water treatment methods
Operations:
- CPI’s typically separate over 99% by volume of the lighter oil phase with particles from 50 to 80 microns and larger
- IGF’s typically separate over 99% by volume of the lighter oil phase with particles from 20 to 50 microns and larger
- Produced water streams contain less than 1% oil in water, and typically contain between 1,000 to 5,000 ppm. At these levels a CPI & IGF based water treatment system will typically clean water in the range of 30 to 40 ppm
- Very large water treatment systems of 100,000 BWPD are generally handled by parallel process trains to provide redundancy and maintenance access during downtime
