API 421API Oil–Water Separators
Oil–Water SeparationView Details
Oil–Water Separation
TPI / CPI Separators
Coalescing plate-pack separators that multiply the effective separation area — delivering very high free-oil removal in a fraction of the footprint of a conventional API basin.
What it is
The Heetu K-Pack TPI (Tilted Plate Interceptor) and CPI (Corrugated Plate Interceptor) separators pack a large coalescing surface into a compact vessel. Closely spaced inclined plates give oil droplets a very short distance to travel before they coalesce and rise, so separation happens faster and in far less space.
Removable plate packs in polypropylene or stainless steel 316 make maintenance straightforward and let the unit be tuned to aggressive or high-temperature streams.
Key features
- Inclined coalescing plate packs multiply separation area
- Removable packs in polypropylene or SS 316
- Available in TPI or CPI configurations
- Significantly smaller footprint than API designs
- High free-oil capture down to fine droplet sizes
- Material options tuned to corrosive environments
How it works
Flow enters the plate pack
Wastewater is distributed evenly across inclined coalescing plates under laminar conditions.
Droplets coalesce
Small oil droplets collide and merge on the plate surfaces, growing large enough to separate quickly.
Oil rises and is skimmed
Enlarged droplets rise to the surface and are removed by skimming.
Solids drop out
Settled solids fall into hoppers beneath the plate pack while clarified water exits.
Where it is used
Applications
- Refineries and petrochemical plants
- Airports and fuel farms
- Groundwater remediation projects
- Rail yards and wash-bay effluent
- Retrofit upgrades of existing separators
Industries served
Aviation & Fuel
Oil & Gas
Petrochemical
Environmental Remediation
Transport
Why it delivers
- Very high free-oil removal, typically 90–98%
- Space-efficient — ideal where footprint is tight
- Lower civil and installation cost
- Simple maintenance with lift-out plate packs
- Flexible for aviation, fuel and remediation duties
Engineering edge
- Coalescing plates handle fine droplets a basin would miss
- Corrosion-resistant PP or SS316 plate options
- Compact vessels simplify skid and containerised builds
- Field-proven in high-throughput fuel and refinery duty
Technical data
| Free-oil removal | 90–98% |
| TSS removal | 30–50% |
| Plate materials | Polypropylene · SS 316 |
| Types | TPI (tilted) · CPI (corrugated) |
| Footprint | Compact vs. API |
| Construction | SS · MS · FRP options |
Specifications are indicative. Final design is engineered to your effluent and site conditions.
Why Heetu K-Pack
Engineered to your stream
Every unit is sized to your flow, load and discharge targets — never an off-the-shelf compromise.
Built in-house
Fabricated and QA-tested in our own workshop for controlled, documented quality.
Proven performance
Field-validated removal rates from pilot through full-scale operation.
Lifetime support
Commissioning, spares and responsive after-sales for the life of your plant.
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