OIL-WATER SEPRATOR

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  2. OIL-WATER SEPRATOR
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Concept

The concept of a basic gravity oil/water separator is simply a tank vessel that stalls the flow rate to permit gravity to separate oil from water. Oil, having a lower specific gravity than water, will naturally float on water if given time to separate.

The rise rate of oil to the surface is determined by Stoke’s Law. There are three main factors affecting the rise rate: oil droplet size, oil specific gravity and temperature. Other factors include oil/dirt particles and flow rate or turbulence. According to Stoke’s Law, a 100 micron size oil droplet will rise three inches in five minutes. When factoring in a flow rate, you can see how a simple oil/water separator will have to be quite large to give the oil enough time to rise to the surface. A 20 micron size oil droplet will rise three inches in 60 minutes. Large oil droplets are more buoyant and, there-fore, rise faster.

In order to reduce the physical size of the oil/water sepa-rator, coalescors have been used successfully for many years. The concept of a coalescor is to use oleophillic (oil loving) media such as polypropylene or teflon. As oil and water flow through the media, an oil droplet impinges on the media and coalesces on the surface.

Coalescing, or bind-ing together, makes them larger and more buoyant. As you can see from the above example, a 100 micron oil particle will rise three inches twelve times faster than a 20 micron particle.Now to further enhance this process, we can use these coalescing media as incline plates thereby drastically reducing the rise or fall of a particle.

Parts of Oil-Water Separator

  • Oil Skimmer
  • Corrugated sheet assembly
  • Adjustable weir
  • Holding Chamber

Working principle

The basic working principle of Gravity Oil water separator to give enough time to raise or fall the oil droplets and separate water from oil. It requires some time more period of time to achieve the desire separation. To achieve faster separation Coalescing media is used. Fine droplets that are too small to be separated by gravity alone are accumulated into bigger drops that rise to the surface. This coalescing media is made of PP/HDPE/PVC.

As the oil/water/solids mixture travels through the plates, oil rises to the top and solids drop to the bottom through dedicated surfaces and weep holes. Plate supports at the bottom allow for easy removal of the solids that collect beneath the plates. And, because of the steep angles and short travel distances, oils and solids are quickly released, making the media virtually self-cleaning.

Applications

  • Oily water separators (OWS) for separating oil from the bilge water accumulated in ships as required by the international MARPOL Convention.

  • Oil and water separators are commonly used in electrical substations. The transformers found in substations use a large amount of oil for cooling purposes. Moats are constructed surrounding unenclosed substations to catch any leaked oil, but these will also catch rainwater. Oil and water separators therefore provide a quicker and easier cleanup of an oil leak.

    • Utilities
    • Oil Terminals
    • Airports
    • Parking Lots
    • Steel Mills
    • Rail Yards
    • Bilge Water
    • Tank Farms
    • Chemical
    • Stormwater Run-Off
    • Ground Water Remediation
    • Generating Stations
    • Vehicle Wash/Repair
    • Food Industry
    • Petro-Chemical Plants
    • Military Installations
    • Gas Stations
    • Refineries

    Advantages

    • Elimination of exorbitant hauling costs for produced/frac water.
    • Recovery of product for sale.
    • Reduced water usage.
    • Elimination of consumable costs for primary oil removal.
    • Longest run times between required maintenance.

    Design Standard

    • API 421
    • ASME B16.5
    • ASME B16.47
    • ASME SEC VIII DIV I
    • ASME SEC VI DIV A/B/C

    Material of Construction

    • Carbon Steel
    • Carbon Steel + FRP
    • Carbon Steel + PVC
    • Carbon Steel + Rubber Lined
    • Carbon Steel + Epoxy Coating
    • Stainless Steel ( SS 304,SS 304L,SS 316,SS 316L)
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