FRIESS SMT500V uses bypass circulation and physical coalescing separation. With a standard flow rate of 600 L/h, it continuously removes floating oil and coalescible dispersed oil droplets from cutting fluids, grinding fluids and industrial washing liquids. Mounted on castors, the unit can be moved between multiple tanks without interfering with the machine tool’s original fluid-supply system.
The standard configuration includes a 350 μm stainless-steel basket filter for larger chips and solid particles. Where fine ferromagnetic metal particles must also be removed, an optional FRIESS FMF 240 magnetic filter provides filtration down to 1 μm.
600 L/h Standard Flow Rate
350 μmStainless-Steel Basket Filtration
Multiple-Tank Service
Mobile on Castors · Bypass Operation
Down to 1 μm
Optional FMF 240
SMT500V operates as an independent bypass system and can purify different tanks in rotation without modifying the machine tool’s existing fluid-supply system. It is ideal for plants seeking higher equipment utilization and fewer permanently installed purification units.
From floating surface intake to the return of purified fluid, SMT500V provides continuous circulation without altering the machine tool’s existing fluid-supply system.
The floating intake follows changes in liquid level and preferentially draws oil-contaminated fluid from near the surface.
A 350 μm stainless-steel basket retains larger chips and solid particles, reducing the risk of blockage in downstream components.
Fine dispersed oil droplets adhere to the oleophilic coalescing media, collide and combine into larger droplets.
The coalesced oil droplets rise and are discharged, while the treated fluid returns to the original tank by gravity.
Select the configuration according to the contaminants in the fluid. The standard unit focuses on oil-water separation and retention of larger solids; an additional magnetic filtration stage can be added where fine ferromagnetic metal particles are present.
Physical coalescing separation requires no chemical additives.
Note: The 1 μm rating refers only to the optional FMF 240 filtration of ferromagnetic particles. The standard SMT500V basket filter is rated at 350 μm.
The following are the main technical specifications for the standard SMT500V configuration. The actual configuration can be adapted to tank conditions, contaminant type and operating requirements.
Model
Standard Flow Rate
Oil-Water Separation Method
Treatable Oils
Standard Pre-Filter
Operating Method
Mobility
Purified-Fluid Return
Optional Configuration
Optional Filtration Rating
SMT500V
600 L/h
Physical separation with oleophilic coalescing media
Floating oil and coalescible dispersed oil droplets
350 μm stainless-steel basket filter
Independent bypass circulation
Castor-mounted for rotation between multiple tanks
Gravity return to the original tank
FRIESS FMF 240 magnetic filter
Down to 1 μm for ferromagnetic particles
Technical note: SMT500V uses physical filtration and coalescing separation and does not include ultraviolet, ozone or other disinfection equipment. It primarily treats floating oil and coalescible dispersed oil droplets and is not designed to remove stable emulsified oil. Other filtration equipment may be required for fine non-magnetic particles.
Tank volume, liquid-level variation, oil type and solid-particle conditions all affect equipment configuration. Provide the following operating information and we will confirm whether SMT500V is suitable and recommend the appropriate configuration.
When machine-way oil, hydraulic oil and other tramp oils enter the coolant, they usually form a floating oil layer on the surface. Long-term accumulation can affect tank condition and routine maintenance and may increase the risk of odour and fluctuations in fluid performance.
Continuous bypass removal of floating oil and coalescible dispersed droplets helps keep tanks clean, reduces the return of tramp oil to the machining circuit, and lowers the need for tank cleaning, fluid replacement and waste-fluid disposal. Actual results depend on fluid condition, contaminant load and operating time.
Continuously remove surface tramp oil before the oil layer thickens.
Lower the chance of floating oil re-entering the machine-fluid circuit.
Reduce tank cleaning, fluid replacement and waste-fluid disposal requirements.
After pre-filtration, the oil-bearing fluid enters the separation unit and passes through an oleophilic coalescing medium. Fine dispersed oil droplets are captured, collide and merge on the medium, gradually forming larger droplets. As their diameter increases, the droplets rise faster, collect at the surface and are discharged, while the treated fluid returns to the original tank by gravity. The entire process is physical and requires no chemicals.
The oleophilic coalescing medium provides a large contact area for fine dispersed oil droplets. As the fluid flows through it, droplets attach, collide and merge, shortening the time required for subsequent rising and separation.
Under ideal conditions such as low Reynolds numbers and approximately spherical droplets, smaller oil droplets require much longer to rise naturally. Coalescence combines fine droplets into larger droplets, accelerating their rise and separation.
| Oil-Droplet Diameter (μm) | Rise Time |
|---|---|
| 300 | 12 seconds |
| 150 | 42 seconds |
| 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 values in the table are theoretical results under specific assumptions. They illustrate how droplet size affects rise time and are not guaranteed equipment performance values. Actual separation time depends on fluid viscosity, temperature, density difference, droplet shape and flow conditions.
According to Stokes’ law, under ideal conditions such as a low Reynolds number and approximately spherical droplets, the theoretical terminal rise velocity of an oil droplet is proportional to the square of its radius:
Symbols: V = terminal rise velocity of the oil droplet; g = gravitational acceleration; r = oil-droplet radius (half its diameter); Δρ = density difference between the continuous phase and the oil droplet; μ = dynamic viscosity of the continuous phase. The formula shows that terminal rise velocity is proportional to the square of the droplet radius.
When all other conditions remain equal and the formula applies, doubling the droplet radius increases its theoretical terminal rise velocity by approximately four times. Fine droplets must therefore first coalesce into larger droplets to substantially shorten rising and separation time.
The following field photographs show the liquid surface before, during and after SMT500V bypass treatment. Actual results and treatment time depend on tank volume, oil load, fluid condition and operating time.
Tank volume alone is not sufficient for selection. Oil load, target circulation rate and daily operating time must also be considered. The SMT500V has a standard treatment rate of 600 L/h; treatment time and rotation intervals for each tank are determined from the actual operating conditions.
The standard 350 μm stainless-steel basket retains larger metal chips and solid particles. For fine ferromagnetic metal particles, the optional FRIESS FMF 240 magnetic filter can achieve filtration down to 1 μm.
Normally no, provided the unit is connected and the flow is set correctly. The SMT500V draws fluid independently from the tank through a bypass loop, and treated fluid returns by gravity, allowing operation separately from the machine tool’s original supply system.
The SMT500V is designed for floating oil and coalescible dispersed oil droplets, not oil that has formed a stable emulsion. If the oil condition is uncertain, please provide a fluid sample or field photographs for assessment.
Yes. The unit is mounted on castors and can be moved between tanks for rotational purification. The appropriate interval depends on tank volume, oil load and target treatment time.
No. The SMT500V uses physical pre-filtration and coalescing separation and does not include UV, ozone or other sterilisation equipment. Its main purpose is to remove floating oil and coalescible dispersed droplets, while the 350 μm stainless-steel basket retains larger solids.
Beyond cost savings, FRIESS oil skimmers, electrostatic oil cleaners, magnetic filters, coolant purification systems, oil-water separators and vacuum oil purifiers provide many additional benefits.
We would be pleased to explain how they can help your process.
