Dolphin Centrifuge supplies 3-phase disc stack centrifuge systems for machining coolant recovery, parts washer fluid recycling, and aqueous metalworking fluid purification. Processing 8–40 GPM continuously, these systems remove tramp oil, metal fines, and bacteria — extending coolant life from weeks to years and cutting fluid replacement costs by up to 90%. Based in Warren, Michigan, with 40+ years of metalworking fluid separation expertise.
Water-based fluids — machining coolants, parts washer solutions, and aqueous cleaning fluids — degrade over time as they accumulate tramp oil, metal fines, and biological contamination. Our 3-phase disc stack centrifuges continuously purify these fluids, extending their useful life by 5-20x and cutting fluid replacement costs by up to 90%.
Why Centrifuges for Water-Based Fluids
Traditional filtration methods struggle with emulsified oils and sub-micron particles common in water-based industrial fluids. A disc stack centrifuge generates thousands of G-forces to separate contaminants that filters simply cannot remove — including free and emulsified tramp oil, metal fines below 1 micron, and bacteria colonies that cause odor and fluid breakdown.
Unlike coalescers or skimmers that only address free-floating oil, centrifugal separation handles all three phases simultaneously: clean fluid, separated oil, and solid sludge. This makes centrifuges the most effective single-step solution for water-based fluid maintenance.
Machining Coolant Centrifuge
Machining coolant is the most common water-based fluid application for industrial centrifuges. Our machining coolant centrifuge systems remove tramp oil, metal fines, and bacteria from water-based coolants. The 3-phase disc stack design extends coolant life 5-20x and eliminates the odor problems caused by bacterial growth.
- Capacity: 8-40 GPM depending on model
- Contaminants removed: Tramp oil, metal fines, bacteria
- Typical ROI: Coolant replacement costs reduced 80-90%
For facilities that also need thermal treatment, our coolant recovery with pasteurizing case study shows how a major machining facility extended coolant life from weeks to years using centrifuge separation with integrated pasteurization.
Industrial Washer Fluid Recovery
Aqueous cleaning fluids and parts washer solutions accumulate oils and sediment that reduce cleaning effectiveness and shorten fluid life. Our industrial washer fluid centrifuge systems continuously remove these contaminants, reducing fluid costs by up to 90% and eliminating the need for frequent bath changes.
- Capacity: 3-15 GPM depending on model
- Applications: Parts washers, spray wash cabinets, immersion cleaning systems
- Benefit: Consistent cleaning quality with dramatically reduced fluid consumption
Is Your Coolant Smelling or Turning Dark?
Tramp oil and bacteria are destroying your coolant life — and your parts quality. Send us a coolant sample and we'll test it and recommend the right centrifuge system to fix it.
Related Case Studies
Real-world centrifuge applications in water-based fluid processing demonstrate measurable results across different industries.
- Coolant Recovery with Pasteurizing — How a major machining facility extended coolant life from weeks to years using centrifuge separation with integrated pasteurization.
- Hydraulic Oil in Extrusion Presses — Centrifuge application for maintaining hydraulic fluid cleanliness in aluminum extrusion press operations.
Choosing the Right System
The right centrifuge depends on your fluid type, flow rate, and contamination profile. For machining coolants with high tramp oil content, a 3-phase DMPX-042 handles up to 40 GPM. Smaller operations or parts washer applications may be well-served by the compact DMPX-028.
Not sure which system fits your process? Send us a fluid sample — we offer complimentary sample testing and will recommend the optimal centrifuge configuration for your application.
Frequently Asked Questions
Why does machining coolant turn rancid and smell bad?
Machining coolant smells because bacteria and fungi grow in the coolant sump, thriving at the oil-water interface created by tramp oil contamination. The bacteria produce hydrogen sulfide and other odorous byproducts. A 3-phase disc stack centrifuge removes both the tramp oil and the metal fines that act as bacterial nutrients — eliminating the root cause of coolant odor and extending sump life.
How much can a centrifuge extend machining coolant life?
Machining coolant centrifuge systems typically extend coolant life from weeks to 2–5 years in most metalworking environments. By continuously removing tramp oil, metal fines, and bacteria, the centrifuge keeps the coolant within concentration and cleanliness specifications. Customers report coolant replacement costs dropping by 80–90% after installing centrifuge purification.
What is tramp oil and why is it harmful to coolant?
Tramp oil is unwanted petroleum oil (hydraulic fluid, way oil, spindle oil) that leaks from machine tools into the coolant sump. It floats on coolant, blocks biocide effectiveness, promotes bacterial growth, and causes dermatitis in workers. A 3-phase disc stack centrifuge removes tramp oil continuously — typically achieving 95%+ tramp oil removal in a single pass.
Can a centrifuge clean parts washer solution?
Yes. Industrial parts washer fluids accumulate metal fines, oils, and dirt that reduce cleaning effectiveness over time. Centrifuge systems process 3–15 GPM of aqueous cleaning fluid, removing sediment and oils while returning clean solution to the washer. This extends bath life significantly and reduces the frequency of costly solution changeouts.
Does coolant centrifugation require heating the fluid?
Water-based coolants are typically processed at ambient or slightly elevated temperatures (80–120°F). Unlike oil centrifuge applications, which benefit significantly from heating, coolant centrifuge systems generally do not require separate heaters. The centrifuge's G-force alone is sufficient to separate the density-differential phases in most water-based fluid applications.
Extend Coolant Life. Cut Replacement Costs by 90%.
3-phase disc stack centrifuge systems for machining coolant, parts washer fluid, and aqueous metalworking fluids. Turnkey systems from Warren, MI.