A standardized oil-water separation solution for individual tanks and independent circulation systems. It continuously removes floating surface oil and promotes the coalescence and rise of separable dispersed oil droplets, while the V-shaped bottom collects and discharges settled solids.
The FRIESS SMT-FB Series combines floating surface suction with physical coalescence separation. The floating intake continuously recovers oil-bearing liquid near the surface. Fine, coalescible dispersed oil droplets attach to the oleophilic polypropylene media, collide and merge, then rise for separation. A V-shaped bottom collects settled solids for periodic discharge.
Seven standard flow rates from 450 to 11,300 L/h cover machine-tool tanks, industrial washing tanks and independent circulation systems. Model selection should consider fluid properties, oil loading, target circulation rate, daily operating time and settled-solids loading. For higher capacity, centralized supply, multiple tanks or multiple suction points, choose the SMT-FL Series oil-water separator.
The floating suction device follows changes in liquid level, keeping the intake close to the surface. Oil-bearing liquid is continuously recovered and pumped to the SMT-FB separation tank. Fine, coalescible droplets attach to and merge on the oleophilic media, then rise after forming larger droplets; settled solids collect at the V-shaped bottom for periodic discharge.
进入分离箱后，含油液体流经亲油性聚结介质。细小、可聚结的分散油滴在介质表面不断碰撞、附着并逐渐聚结为较大的油滴。随着粒径增大，油滴在与连续液相的密度差作用下更快上浮并汇集至液面，随后通过排油结构排出。
分离后的液体返回现场液槽继续循环；沉降杂质则沿分离箱底部的 V 型结构向排渣口汇集，便于定期排放。整个过程采用物理分离原理，无需添加化学药剂。
This installation uses a floating surface suction device. The intake follows changes in liquid level, remains near the surface and continuously transfers oil-bearing liquid to the SMT-FB separation tank for subsequent coalescence separation.
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| Model | Standard Flow Rate (L/h) | Dimensions (L × W × H, mm) | Separation Tank Material |
|---|---|---|---|
| SMT450-FB | 450 | 838 × 415 × 1066 | 304 Stainless Steel |
| SMT680-FB | 680 | 991 × 415 × 1066 | 304 Stainless Steel |
| SMT1100-FB | 1100 | 1219 × 415 × 1066 | 304 Stainless Steel |
| SMT2200-FB | 2200 | 1219 × 720 × 1066 | 304 Stainless Steel |
| SMT3400-FB | 3400 | 1219 × 1024 × 1066 | 304 Stainless Steel |
| SMT5600-FB | 5600 | 1524 × 1330 × 1066 | 304 Stainless Steel |
| SMT11300-FB | 11300 | 1829 × 1024 × 1676 | 304 Stainless Steel |
Custom specifications are available for specific operating conditions.
SMT-FB oil-water separation in operation | Top: the separated oil phase rises and collects at the surface; bottom: return zone for the treated liquid. Actual separation conditions depend on fluid properties, oil loading and operating conditions.
SMT-FB model selection should not be based on tank volume alone. Fluid properties, oil loading, target circulation rate, daily operating time and settled-solids loading must also be considered.
The standard SMT-FB Series offers seven flow rates from 450 to 11,300 L/h. Higher capacities, special connections and special site conditions can be accommodated through application-specific configurations.
The video shows the SMT-FB separation tank in actual operation. The separated oil phase collects at the surface while the treated liquid enters the return zone.
Note: The video reflects operation under specific site conditions. Actual results depend on fluid properties, oil loading and operating conditions.
The SMT-FB separation tank contains oleophilic polypropylene coalescing media with a specific surface area of approximately 433 m²/m³. Fine, coalescible dispersed droplets attach, collide and merge on the media as they pass through it. As the droplets grow, their rise velocity increases, allowing them to collect at the surface and be discharged more readily.
| Time Required for Oil Droplets to Rise 75 mm (3 in) | |
|---|---|
| Droplet Diameter (μm) | Rise Time |
| 300 | 12 sec |
| 150 | 42 sec |
| 60 | 4 min 12 sec |
| 30 | 17 min 24 sec |
| 15 | 1 h 8 min 54 sec |
| 5 | 10 h 2 min 9 sec |
Note: The table shows theoretical values calculated under specified assumptions. Actual separation time varies with fluid properties and operating conditions.
According to Stokes’ law, under ideal conditions such as low Reynolds number and approximately spherical droplets, the theoretical terminal rise velocity is proportional to the square of the droplet radius:
V: terminal rise velocity; g: gravitational acceleration; r: droplet radius; Δρ: density difference between the continuous liquid phase and the oil droplet; μ: dynamic viscosity of the continuous liquid phase.
Note: Actual separation performance is also affected by liquid viscosity, temperature, density difference, droplet shape and flow conditions.
A conventional oil skimmer mainly recovers floating oil that has already formed a layer at the surface. The SMT-FB uses floating suction to recover oil-bearing surface liquid and coalescing media to help fine dispersed droplets merge and rise. It therefore removes floating oil and reduces the concentration of coalescible dispersed droplets. Its V-shaped bottom also collects and discharges settled solids.
The SMT-FB primarily removes floating oil, free oil and coalescible dispersed oil droplets from emulsions. The physical separation process does not actively break the chemical structure of emulsifiers. Chemically stable emulsified or dissolved oils may respond differently depending on the formulation, droplet size and operating conditions; testing with a fluid sample is recommended.
Major tank modifications are normally unnecessary. The unit can be installed beside the tank and connected to the existing system through the floating suction device, transfer piping and return piping. Connections, piping, power supply and equipment position can be configured for the available space and tank design.
There is no universal replacement interval for the coalescing media. Maintenance frequency depends on fluid type, oil loading, solid contamination and operating time. If flow rate declines, separation performance changes or the media becomes visibly contaminated, inspect, clean or replace it according to the maintenance requirements.
Not necessarily. The SMT-FB removes free oil, floating surface oil and coalescible dispersed oil droplets; it is not a complete industrial wastewater treatment system. Where specific discharge limits apply, downstream treatment must be selected for the water quality, contaminant composition and local requirements, and compliance must be confirmed by testing.
Beyond cost savings, FRIESS oil skimmers, electrostatic oil cleaners, magnetic filters, coolant purification systems, oil-water separators and vacuum oil purifiers offer many additional benefits.
We would be pleased to explain how they can benefit your application.
