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Coalescence Dehydration Oil Purifier
1 Product Overview
Coalescence Dehydration Oil Purifier is a mobile integrated oil purification unit based on coalescing separation principle.Contaminated oil is delivered by gear pump and sequentially passes through pre-filter, hydrophilic coalescing element, gravity settling zone, hydrophobic separation element and polishing filter. Micro emulsified droplets aggregate into large drops and settle. Residual fine water droplets are trapped by separation media and settle again. Accumulated water is drained periodically while solid particles are captured by multi-stage elements, achieving simultaneous dehydration and fine filtration.
Classification Reminder
Coalescence Dehydration Oil Purifier: mobile lube oil purifier for hydraulic oil & turbine oil with built-in pump.
Fuel Coalescing Dehydrator: inline stationary separator mainly for jet fuel & diesel pipelines.
PFC Series Oil Purifier: particle removal filter cart without coalescing dehydration function.
Vacuum Oil Purifier: adopts heating & vacuum evaporation for dehydration with higher energy consumption.
2 Main Structural Composition
Mobile Base AssemblyPainted carbon steel frame, oil drip tray, lockable casters and push handle.
Transfer UnitLow-pulsation gear pump, 3-phase motor (explosion-proof optional).
Filtration & Coalescing Separation SystemSuction strainer, coalescing element assembly, settling chamber, hydrophobic separation element, polishing filter.
Monitoring & Control SystemInlet & outlet pressure gauges, DP alarm, oil-water interface transmitter, electric control box.
Drainage UnitManual blowdown valve or automatic electric drain valve.
Pipe AccessoriesOil-resistant hoses, quick couplings, relief safety valve and vent valve.
3 Working Principle
Pre-filtration StageRaw oil flows through inlet strainer to trap large debris and protect gear pump and downstream elements.
Coalescing & Demulsification StageOil enters hydrophilic coalescing media. Micro free water and emulsified droplets are captured by fibers and merge into large droplets. Most droplets sink to bottom water sump under gravity for primary separation.
Separation & Deep Dehydration StageOil carrying residual tiny droplets flows upward into hydrophobic separation element. Oil penetrates smoothly while water droplets cannot pass through, aggregate and settle down continuously.
Polishing & Water DischargeClean oil passes polishing filter for solid particle control. Water is drained automatically or manually when reaching preset level. Rising differential pressure indicates element fouling and replacement required.Whole process runs at ambient temperature with purely physical separation without damaging oil additives.
4 Basic Technical Parameters
Standard Flow Rates: 25 / 50 / 100 / 150 / 200 L/minApplicable Media: turbine oil, hydraulic oil, gear oil, compressor oil, industrial lubricantsOperating Temperature: 5～80℃ (preheater optional for high viscosity oil)Inlet water content: ≤3000ppmResidual outlet water content: ≤50～100ppmSolid filtration rating: 3～7μmOutput cleanliness: NAS Class 5～8Max working pressure: ≤0.6MPaPower Supply: AC380V 3-phase 50Hz (explosion-proof optional)Element replacement differential pressure: 0.25～0.30MPa
5 Core Product Advantages
All-in-one coalescing, separation and polishing filter to remove emulsified water, free water and solid contaminants simultaneously.
Ambient temperature operation avoids thermal degradation and protects oil additives.
Fast startup without preheating; lower power consumption and easier maintenance compared with vacuum oil purifiers.
Mobile design for shared use among multiple tanks, supporting offline circulation filtration and new oil filling.
Automatic oil-water interface monitoring enables unattended continuous operation.
Multi-level safety protection prevents pump dry-running, element breakdown and system overpressure.
Standard and explosion-proof configurations for ordinary workshops and hazardous chemical zones.
Sufficient domestic alternative filter elements to control long-term spare parts cost.
6 Installation, Commissioning & Maintenance Specification
Place unit on flat ground and lock casters. Keep suction hose away from tank bottom sludge.Vent all air before initial commissioning and set relief valve pressure within rated range.Monitor DP and oil-water interface regularly and drain water on schedule. Replace elements once DP reaches alarm threshold.Cut power and fully depressurize before element replacement. Clean sealing surface and inspect O-rings.Thoroughly flush housing and piping before switching different oil grades to avoid cross-contamination.Drain accumulated water and residual oil before long-term shutdown and clean chamber to prevent sludge buildup.
7 Common Faults & Solutions
Poor dehydration efficiency, high outlet water contentCauses: worn coalescing elements; low oil temperature; flow exceeding rated capacitySolutions: replace coalescing cartridges; install preheater; reduce flow within rated range
Rapid DP rise, frequent element foulingCauses: high sludge & impurity load; lack of upstream pre-filtrationSolutions: add upstream pre-filter; shorten element replacement cycle
Malfunction of interface gauge, failure of auto drainCauses: probe contaminated by oil sludge; blocked impulse tubingSolutions: clean level probe regularly; purge sampling pipelines
Insufficient pump flow & poor suctionCauses: air leakage on suction line; clogged inlet strainer; excessive oil viscositySolutions: tighten hose connections; clean suction strainer; activate preheating
Leakage at flanges & pipe jointsCauses: aged sealing gaskets; uneven bolt torqueSolutions: fit new oil-resistant seals; tighten bolts evenly diagonally
8 Standard Supply List & Optional Accessories
Standard Supply List
Mobile frame, gear pump & motor assembly, pre-filter assembly, coalescing separation vessel, coalescing elements, separation elements, polishing filter elements, DP gauges, oil-water interface meter, manual drain valve, relief valve, suction & discharge hoses, complete sealing set, flow direction nameplate, operation manual.
Optional Accessories
Explosion-proof motor & control cabinet, PLC touch screen control system, auto drain solenoid valve, remote DP transmitter, extended hoses, quick disconnect couplings, heat tracing assembly, spare element kit.
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