Editorial Technical Reference

Oil-Water Separator

This page explains how Oil-Water Separator is classified within Machinery and Equipment Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

An oil-water separator is a component used in compressed air systems to remove oil aerosols, water vapor, and liquid contaminants from the compressed air flow.

Representative product image. Confirm appearance and specifications with the manufacturer.

Product Specifications

Technical details and manufacturing context for Oil-Water Separator

Definition
An oil-water separator is a component used in compressed air systems to remove oil aerosols, water vapor, and liquid contaminants from the compressed air flow. It is typically installed downstream of the air compressor and upstream of sensitive equipment such as pneumatic tools, instrumentation, or process machinery. The separator protects downstream equipment from damage caused by oil and water carryover, and helps maintain air quality standards required for various applications. The device operates on the principle of coalescing filtration: compressed air passes through a specialized filter media that causes oil and water droplets to coalesce into larger droplets. These larger droplets then migrate to a collection bowl where they are drained manually or automatically. The separator is available in various configurations and materials, including stainless steel, polypropylene, and PTFE membrane, to suit different operating environments. Key parameters to consider when selecting a separator include operating pressure (typically 1.0–1.6 MPa), flow capacity (0.5–20 m³/min at 0.7 MPa inlet pressure), filtration rating (0.01–5 μm, ISO 8573-1 Class 1–5), oil carryover (0.01–0.5 mg/m³, ISO 8573-1 Class 1–4), operating temperature (-40 to 85 °C, non-freezing), ambient humidity (0–95% RH, non-condensing), IP rating (IP54–IP65), body material (stainless steel 304–316L), weight (2–150 kg), and connection size (G1/4–G2 BSPP). These values are reference ranges and must be verified for the specific model and application. The separator is designed to operate within specified limits; exceeding these limits may lead to reduced efficiency or failure. Regular maintenance, including checking and draining the collection bowl, is necessary to ensure proper function. Always consult the manufacturer's documentation for installation, operation, and maintenance instructions.
Working Principle
The oil-water separator uses coalescing filtration to remove oil and water from compressed air. As the air passes through the filter media, small droplets of oil and water collide and merge into larger droplets. These larger droplets are then carried by the air flow to a collection area, where they settle and are drained away. The filter media is designed to capture particles and aerosols while allowing clean air to pass through. The efficiency of the separation depends on the air flow rate, pressure, and the characteristics of the contaminants. The separator must be sized appropriately for the system's flow capacity and operating pressure to ensure effective removal.
Common Materials
Stainless Steel, Polypropylene, PTFE Membrane
Technical Parameters
ParameterTypical rangeNotes & selection driver
Flow Capacity0.5–20 m³/minAt 0.7 MPa inlet pressureISO 1217
Filtration Rating0.01–5 μmClass 1–5 for oil and particlesISO 8573-1
Oil Carryover0.01–0.5 mg/m³Class 1–4ISO 8573-1
Operating Temperature-40–85 °CNon-freezing conditions
Ambient Humidity0–95 % RHNon-condensing
IP RatingIP54–IP65Dust and water jet protectionIEC 60529
Body Material304–316LStainless steel for corrosion resistanceASTM A240
Weight2–150 kgDepends on size and material
Connection SizeG1/4–G2 inchBSPP threadISO 228-1

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM
  • Coalescing Filter Element Part
    Primary filtration media that causes oil and water droplets to coalesce
    Material: Glass fiber or synthetic media
  • Collection Bowl Part
    Collects separated liquids for drainage
    Material: Polycarbonate or metal
  • Drain Valve
    Automatically or manually discharges collected liquids
    Material: Brass or stainless steel
  • Housing Part
    Pressure vessel containing the filter element
    Material: Aluminum or stainless steel

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Oil-Water Separator.

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: Up to 16 bar (232 psi)
flow rate: 0.5 to 1000 m³/h
temperature: -20°C to 80°C
oil concentration: Up to 1000 ppm inlet, <0.01 ppm outlet
Media Compatibility
✓ Compressed air systems ✓ Industrial process gas streams ✓ Lubricated compressor discharge
Unsuitable: High particulate slurry with abrasive solids (>50 microns)
Sizing Data Required
  • Maximum air flow rate (m³/h or SCFM)
  • Operating pressure (bar or psi)
  • Required oil removal efficiency (ppm)

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Emulsion formation
Cause: Inadequate chemical treatment, improper pH control, or excessive turbulence preventing oil-water separation due to stable droplet dispersion.
Corrosion and fouling
Cause: Aggressive water chemistry (e.g., high chloride, H2S), microbiologically influenced corrosion (MIC), or scaling from hardness/minerals reducing efficiency and structural integrity.
Maintenance Indicators
  • Visible oil sheen or emulsion in the effluent water discharge
  • Abnormal pressure drop across separator plates or coalescing media indicating clogging
Engineering Tips
  • Implement real-time monitoring of influent/effluent quality (e.g., pH, oil concentration, turbidity) with automated chemical dosing to maintain optimal separation conditions.
  • Establish a routine cleaning and inspection schedule for internal components (plates, coalescers, weirs) using non-destructive testing (NDT) to detect early corrosion or fouling.

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards
ANSI/ASME B31.3 - Process piping DIN EN 858 - Separator systems for light liquids

Quoted from the published standard.

Manufacturing Precision
  • Flange flatness: ≤0.1mm per 300mm diameter
  • Weld seam alignment: ±1.5mm from centerline
Quality Inspection
  • Hydrostatic pressure test at 1.5x design pressure
  • Oil separation efficiency test per API 421

Manufacturers of Oil-Water Separator

2 companies list this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

Filson Filter
Henan, CN
Listed on the company's own website · profile compiled by CNFX from public sources
Jiangxi Ruiqian Auto Parts Co., Ltd.
Shangrao, Jiangxi, CN
Founded 1988300+ staff10,000+ Square Meters
ISO-TS16949:2009 ISO9001:2008 IATF 16964:2016
Also makes: Fuel Filter, Air Filter, Integrated Filter and 5 more
Listed on the company's own website · profile compiled by CNFX from public sources

Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

Technical documentation
Request current drawings, revision history, and a signed specification sheet.
Manufacturing capability
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Inspection readiness
Confirm test methods, calibrated equipment, sampling plans, and traceable reports.
Supplier transparency
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Frequently Asked Questions

What is the typical operating pressure range for an oil-water separator?

The typical operating pressure range is 1.0–1.6 MPa, as listed in the directory. Always verify the exact pressure rating for your specific model with the manufacturer.

How does the separator remove oil and water from compressed air?

The separator uses coalescing filtration. Compressed air passes through a filter media that causes oil and water droplets to merge into larger droplets. These larger droplets then drain by gravity into a collection bowl for removal.

What filtration ratings are available?

The filtration rating ranges from 0.01 to 5 μm, corresponding to ISO 8573-1 Class 1–5 for oil and particles. The oil carryover is 0.01–0.5 mg/m³, Class 1–4. These are reference values; confirm the actual performance for your application with the supplier.

What materials are used for the separator body?

The separator body is available in stainless steel (grades 304–316L), polypropylene, or with a PTFE membrane. The choice depends on the operating environment and corrosion resistance requirements. Verify material compatibility with your system.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification
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