- 10 ppm Performance, Built Rugged: Designed for 30 micron droplets with coalescing media for high-efficiency removal
- Built-to-Order for Any Application: Over 33 model sizes up to 5,000 GPM—tailored for your system needs
- True Industrial Construction: A-36 carbon steel, FRP or stainless steel—built to last in harsh conditions
- Modular, Customizable Options: Effluent filtration, pumpouts, augers, containerized systems, freeze protection, and more
- API-421 Design, Proven Theory: Trusted performance based on Stokes Law and coalescing science
IN STOCK. READY TO SHIP.
Need an API Coalescing Oil Water Separator without the 12–16 week wait? Systems are stocked and ready to ship so you can reduce downtime, control oily water on-site, and keep operations moving.
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Industrial Oil Water Separator Features
Fabricated Steel API Design – Engineered for Rugged Industrial Oil-Water Separation
SkimOIL® Industrial Oil Water Separators deliver dependable oil and solids removal for industrial pits, tank farms, refineries, wash racks, stormwater systems, and process water operations. Designed for 10 ppm performance with 30-micron droplet removal, these separators combine proven API-421 coalescing design with heavy-duty construction for reliable separation and low-maintenance operation.
01
Design
- Rugged industrial construction: A-36 carbon steel, stainless steel, or FRP built for harsh environments.
- Coalescing media: Flopak packs create laminar flow to separate oils from water efficiently.
- Adjustable weirs and solids V-hopper: Optimize separation and handle site-specific conditions.
- Modular options: Effluent filtration, pumpouts, sludge augers, freeze protection, and containerized systems.
- Industry-proven engineering: Built using recognized API-421 and industrial fabrication standards.
02
PERFORMANCE
- High-efficiency oil removal: 10 ppm or less of oils 30 microns and larger.
- Solids management: Handles 40–100 mg/L total suspended solids.
- Broad industrial applications: Hydraulic oils, fuels, lube oils, vegetable oils, DNAPL/LNAPL, and more.
- Continuous operation: Designed for high-volume, unattended industrial use.
- Proven cost savings: Reduces disposal, cleanup, and regulatory compliance costs.
03
INSTALLATION & MAINTENANCE
- Flexible deployment: Skid-mounted, trailer-mounted, or containerized for fast installation.
- Low maintenance: Easy access to media packs, weirs, and pumpout systems.
- Monitoring & controls: Optional oil/water sensors, automatic pump shutoffs, and Class 1 Div 1 & 2 compliance.
- Long-term durability: Coatings and surface preparation ensure corrosion resistance and operational reliability.
WHY INDUSTRIAL OIL WATER SEPARATORS MATTER
When industrial oil-water separation must be reliable, efficient, and compliant, SkimOIL® Industrial Oil Water Separators deliver long-term, low-maintenance performance. Designed for refineries, steel mills, wash racks, tank farms, and stormwater systems, these separators remove oils and solids effectively, reduce disposal costs, and keep operations running smoothly—proven to handle the toughest industrial challenges.
R/OS/X Series Coalescing Oil Water Separators (OWS)
The ROS Series steel Coalescing Oil Water Separators (OWS) are designed for applications where a rugged high-performance coalescing oil water separator design is desired using coalescing media. The industrial duty R/OS/X design has many features such as solids V-hopper, adjustable water weir, integral inlet diffuser, A-36 carbon steel or stainless steel construction and many options to provide engineers, system integrators and end users with convenience and flexibility in oil separator system configuration choices. Typical performance is 10 ppm or less, 30 micron oil droplet.
We build these to fit your specific needs and requirements!
Products removed: motor oils, fuels (vehicle/jet), fuel oils, hydraulic fluids, immiscible machining oils, lube oil, transmission fluid, bunker c, DNAPL, LNAPL, vegetable based oils, crude, air compressor lube & other hydrocarbon based derivatives (BTEX etc.). Model sizing is based on the oil/fuel specific gravity, droplet size removal desired and other parameters of the waste stream.
R/OSF/X Fiberglass Series Brochure / R/OS/X Steel Series Brochure / R/OSe/X Stainless Steel Series Brochure
PERFORMANCE
- Oil/fuel removal: 10 mg/L or less of oil droplets 30 micron and larger of non-emulsified, free and dispersed oils
- Solids (TSS): 40–100 mg/L
- Influent loading: Oils ≤1250 mg/L; TSS ≤400 mg/L
SPECIFICATIONS
- Specification Summary: R/OS/X oil water separator
- System model: Coalescing Separator
- Number of model sizes: 33
- Process types: Oil separation, TSS settling
- Volume range offered: 5–5000 GPM
Design Specification Summary
- Performance: 10 mg/L or less 30 micron free, dispersed and non-emulsified oil droplet
- Design criteria: API-421, 1990 & current coalescing media design theory
- Influent chamber: Influent diffuser or overflow weir
- Separation chamber: To contain Flopak media pack(s)
- Solids hopper: Located under and after separation chamber and TPI packs
- Clean water effluent chamber: Located after separation chamber
- Water baffle: Water flows over this baffle to exit tank
- Weir plate: Vertically adjustable weir plate to maintain operating water level
- Oil skimmer: Fixed or adjustable weir plate integrated into the oil reservoir, located in the separation chamber
- Oil reservoir: Located in separation chamber for temporary storage of skimmed oils
- Media pack: Single or multiple, Wave Plate or flat plate separation packs
- Cover: Multiple section vapor retaining, gasketed with polyethylene gasket and attached via zinc plate fasteners
- Fittings: NPT couplings up to 3″, 4″ & larger: 150# ANSI B16.5 FF flange
- Base: Steel skid base of channel, beam or tube construction
- Lifting lugs: (4) Minimum, located at lifting points on sidewalls of tank
Materials of Construction
- Tanks: A-36 carbon steel, 304/316 SS, FRP, polyethylene, polypropylene
- Piping: A-53 black steel, 304/316 SS, FRP, PVC
- Testing: Dye penetrant on steel construction
- Surface prep (steel):
- Interior: SSPC-SP10 near white metal blast
- Exterior: SSPC-SP6 commercial blast
- Coatings (steel):
- Interior: Amercoat 78HB Coal Tar Epoxy (16 mils DFT)
- Exterior: Amerlock 2 Epoxy Primer + Amershield Aliphatic Top Coat
- Standards Used: AWS D1.1/1.1M, API-650, API-421, ANSI, IEC, UL, NEMA, NFPA79, NEC
OIL WATER SEPARATOR THEORY
Coalescing Oil Water Separators: Passive, physical separation systems designed for removal of oils, fuels, hydraulic fluids, LNAPL and DNAPL products from water. Designed performance can be described by a combination of Stokes Law and current coalescing plate theory.
Separation Process: The water/oil mixture enters the separator and is spread out horizontally, distributed through an energy and turbulence diffusing device. The mixture enters the Flopak media where laminar and sinusoidal flow is established and the oils impinge on the media surface. As oils accumulate they coalesce into larger droplets, rising upward through the pack corrugations until they reach the top of the pack, where they detach and rise to the water’s surface. At the same time solids encounte
APPLICATIONS
- Groundwater Remediation
- Refineries
- Vehicle & Military Wash Racks
- Industrial Process Water
- Steel Mills
- Stormwater Treatment
- Shipping (Ballast & Bilge)
- Tank Farms
- Petro-Chemical
- Power Generation
- Heat Treating
OPTIONS
Fluid Handling Systems
- Influent feed systems (diaphragm or cavity pumps)
- Effluent pumpout w/ level switches
- Sludge pumpout system with timer
- Oil pumpout systems – air/electric, up to 100 GPM
Solids & Sludge Management
- Sludge auger system with motor
- Retpak secondary coalescer
- External sight/level glass
- Sludge tank systems
Performance Enhancements
- Freeze protection
- High temp media up to 200°F
- Alternate media materials (PVC, HPVC, Polypropylene, Stainless)
- Effluent filter and specialty systems
- Carbon filtration
- Emulsion cracking systems
- pH adjustment systems
System Packaging & Deployment
- Containerized systems
- Trailer-mounted systems
- Skid-mounted field systems
- Fully integrated system skids
Controls & Monitoring
- Vent scrubber
- Oil/water level sensors
- Class 1 Div 1 & 2 compliance
- Oil monitoring + automatic shutoffs
- Seismic zone design (Zone 2, 3, 4)
Request a Custom Quote Now
- Built for YOUR flow rate, space, and oil/water profile
- 5 to 5,000 GPM capacity options
- API + coalescing performance = 10 ppm or less
- Fully integrated skids, pumps, augers, and controls