90–98% oilTPI / CPI Separators
Oil–Water SeparationView Details
Oil–Water Separation
API Oil–Water Separators
Robust gravity separators engineered to the API 421 standard for dependable removal of free oils and settleable solids from industrial effluent — even under fluctuating loads.
What it is
Heetu K-Pack API Oil–Water Separators provide a proven, low-maintenance first stage of treatment for streams carrying free oil and heavy suspended solids. Designed to the American Petroleum Institute API 421 methodology, each unit is sized to give the calm residence time that gravity separation needs to work reliably.
The result is a rugged, gravity-driven separator that shrugs off variable oil loads and protects the downstream equipment that follows it — flotation, filtration or biological polishing — while helping you meet discharge and reuse targets.
Key features
- Sizing and internals designed to the API 421 standard
- Choice of construction: stainless steel 304/316, RCC or mild steel
- High-efficiency surface skimming for continuous oil recovery
- Dedicated sludge hoppers for easy settled-solids removal
- Baffled outlet that holds separation quality under surges
- Engineered for real-world, fluctuating industrial conditions
How it works
Calm inlet zone
Effluent enters a quiescent chamber sized for the API residence time, letting flow settle into laminar conditions.
Oil rises and is skimmed
Density differences drive free oil to the surface where it is continuously skimmed to a collection trough.
Solids settle out
Heavier settleable solids drop into dedicated sludge hoppers for periodic removal.
Clarified water exits
Treated water passes beneath baffles and leaves the unit ready for discharge or further polishing.
Where it is used
Applications
- Refinery and petrochemical effluent
- Power-generation plant drains
- General manufacturing wastewater
- Rail yards and vehicle wash bays
- Tank-farm and terminal runoff
Industries served
Oil & Gas
Refining & Petrochemical
Power Generation
Heavy Manufacturing
Transport & Logistics
Why it delivers
- Stable performance even when inlet oil loads swing
- Simple, gravity-based operation with minimal moving parts
- Lower running costs and long service life
- Protects and de-loads downstream treatment stages
- Site-specific engineering rather than a one-size box
Engineering edge
- Time-tested API 421 hydraulics for predictable performance
- Corrosion-appropriate material selection per stream
- Skimming and sludge handling designed for easy operation
- Modular sizing from small drains to large refinery flows
Technical data
| Design standard | API 421 |
| Free-oil removal | 70–90% (>150 micron) |
| TSS removal | 30–50% |
| Construction | SS 304/316 · RCC · MS |
| Skimming | Continuous surface skimmer |
| Configuration | Above-ground or in-ground |
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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