The SMT500C is a compact mobile bypass system for machine-tool tanks and a coolant purification system. It uses bypass circulation and physical coalescing separation, with a nominal flow rate of 600 L/h, to continuously remove floating oil and coalescible dispersed oil droplets from coolant, grinding fluid and industrial washing liquids.
Manufacturer: Wuhan Ouyi Environmental Protection Equipment Co., Ltd.
Country of origin: China
The SMT500C is suitable for CNC machining centres, grinding machines, industrial washing machines, individual tanks and small central fluid systems. Where fine ferromagnetic particles must also be removed, it can be fitted with an optional FRIESS FMF 240 magnetic filter. The final configuration and operating time should be selected according to tank volume, fluid properties, oil load and available daily operating time.
Installing a fixed purification unit for every machine or tank increases both floor-space requirements and investment. The compact mobile SMT500C can be moved to the required tank and operated independently. It draws fluid, separates oil and returns the treated fluid without modifying the machine’s existing fluid supply system.
Pipe colour key — Yellow: oil-contaminated liquid transfer; Green: treated-fluid return; Dark grey: separated-oil discharge
The floating suction device follows changes in liquid level and preferentially draws the oil-rich layer near the surface.
Oil-contaminated fluid is transferred through an independent bypass without altering the machine’s existing supply system.
Small oil droplets attach to the oleophilic coalescing medium, collide and merge into larger droplets.
Coalesced droplets rise and are discharged, while treated fluid returns to the original tank by gravity.
Select the configuration according to the contaminants present. The standard system focuses on oil-water separation and interception of larger solids; a magnetic filtration unit can be added for fine ferromagnetic particles.
Uses physical coalescing separation without chemical additives.
Note: The 1 μm figure applies only to the optional FMF 240 and ferromagnetic particles. The standard SMT500C basket filter is rated at 350 μm.
The following data applies to the standard SMT500C configuration. The final configuration can be adapted to tank conditions, contaminant type and operating requirements.
The SMT500C is designed primarily for bypass removal of floating oil and coalescible dispersed oil droplets from coolant, grinding fluid and industrial washing liquids. If fine ferromagnetic particles are also present, an optional FRIESS FMF 240 can be added. Stable emulsified oil, fine non-ferromagnetic solids or applications requiring disinfection call for additional treatment technologies.
The SMT500C is designed primarily for bypass removal of floating oil and coalescible dispersed oil droplets from coolant, grinding fluid and industrial washing liquids. If fine ferromagnetic particles are also present, an optional FRIESS FMF 240 can be added. Stable emulsified oil, fine non-ferromagnetic solids or applications requiring disinfection call for additional treatment technologies.
The oil-contaminated liquid first passes through a 350 μm stainless-steel basket filter, then enters the separation chamber and flows through oleophilic coalescing media. Fine oil droplets are captured on the media, collide and merge into larger droplets. As they grow, their rising velocity increases, allowing them to collect at the surface for discharge. The treated liquid returns to the original tank by gravity.
Need greater system capacity and expandability? Explore the SMT500V mobile coolant purification system.
The oil-contaminated liquid first passes through a 350 μm stainless-steel basket filter, then enters the separation chamber and flows through oleophilic coalescing media. Fine oil droplets are captured on the media, collide and merge into larger droplets. As they grow, their rising velocity increases, allowing them to collect at the surface for discharge. The treated liquid returns to the original tank by gravity.
Oleophilic coalescing media provides a large contact area that captures fine dispersed oil droplets on its surface.
As the liquid flows, captured droplets collide and merge on the media, gradually forming larger droplets.
Once enlarged, the droplets rise more quickly, form an oil layer at the surface and are discharged from the unit.
Under the applicable Stokes-law conditions—low Reynolds number and approximately spherical droplets—the theoretical terminal rising velocity is proportional to the square of the droplet radius. Doubling the radius therefore increases the theoretical rising velocity by approximately four times.
V: terminal rising velocity of the oil droplet; g: gravitational acceleration; r: droplet radius; Δρ: density difference between the continuous phase (water phase) and the oil droplet; μ: dynamic viscosity of the continuous phase.
Note: This relationship applies under ideal conditions such as low Reynolds number and approximately spherical droplets. Actual separation performance is also affected by viscosity, temperature, density difference, droplet shape, flow conditions and operating time.
This field video shows the SMT500C operating at a CNC machining site. The unit draws liquid independently from the target tank, passes it through basket pre-filtration and coalescing separation, and returns the treated liquid by gravity. No modification to the machine’s existing fluid supply is required, and one unit can be rotated among multiple tanks.
The field photographs below show the liquid surface before, during and after SMT500C bypass treatment. Actual results and the time required depend on tank volume, floating-oil load, fluid properties and operating time.
Tank volume alone is not sufficient for selection. Oil load, target turnover and available daily operating time must also be considered. With a nominal flow rate of 600 L/h, the treatment time and rotation cycle for each tank should be determined from actual site conditions.
The standard 350 μm stainless-steel basket filter intercepts larger chips and solid particles. For fine ferromagnetic metal particles, the optional FRIESS FMF 240 magnetic filter provides filtration down to 1 μm. Fine non-ferromagnetic particles require a different filtration technology.
Normally not, provided the unit is connected correctly and the flow is properly set. The SMT500C draws liquid from the tank in an independent bypass circuit and returns the treated liquid by gravity, without changing the machine’s existing fluid supply system.
The SMT500C is designed to remove floating oil and coalescible dispersed oil droplets. It is not suitable for oil that is stably emulsified in the water phase. If the contamination state is unclear, please provide a fluid sample or site photographs for assessment.
Yes. Its compact castor-mounted design allows one unit to rotate among multiple machines or tanks. The appropriate rotation cycle depends on tank quantity and volume, oil load and available daily operating time.
No. The SMT500C uses stainless-steel basket pre-filtration and physical coalescing separation; it does not include UV, ozone or other disinfection equipment. Where microbial control is required, it should be combined with suitable disinfection or fluid-management technology.
Tank volume, level variation, fluid properties, floating-oil load and solid-particle conditions affect equipment configuration, operating time and tank rotation. Submit the application data below and we will assess suitability, recommend the standard configuration or optional FMF 240, and propose an operating plan.
If possible, also provide photographs of the complete tank, liquid-surface contamination and proposed installation location so that we can recommend the configuration more accurately.
Beyond direct cost savings, FRIESS oil skimmers, electrostatic oil cleaners, magnetic filters, coolant purification systems, oil-water separators and vacuum oil purifiers provide many additional operational benefits.
We would be pleased to explain how these solutions can support your process.
