Category: Water Treating Equipment

Hydrocyclone Separator

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Hydrocyclone separators, sometimes called enhanced gravity separators, use centrifugal force to remove oil droplets from oily water. As shown in Figure 7-16, static hydrocyclone separator consist of the following four sections: a cylindrical swirl chamber, a concentric reducing section, a fine tapered section, and a cylindrical tail section. Oily water enters the cylindrical swirl chamber …

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Skim Pile

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The skim pile is a type of disposal pile. As shown in Figure 7-18, flow through the multiple series of baffle plates creates zones of no flow that reduce the distance a given oil droplet must rise to be separated from the main flow. Once in this zone, there is plenty of time for coalescence …

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Disposal Piles

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Disposal piles are large diameter (24- to 48-inch) open-ended pipes attached to the platform and extending below the surface of the water. Their main uses are to (1) concentrate all platform discharges into one location, (2) provide a conduit protected from wave action so that discharges can be placed deep enough to prevent sheens from …

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Sizing Dispersed Gas Units

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It can be shown mathematically that an efficient design must have a high gas induction rate, a small diameter induced gas bubble, and relatively large mixing zone. The design of the nozzle or rotor, and of the internal baffles, is thus critical to the unit’s efficiency. As measured in actual field tests, these units operate …

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Dispersed Gas Units

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In dispersed gas units gas bubbles are dispersed in the total stream either by the use of an inductor device or by a vortex set up by mechanical rotors. Figure 7-14 shows a schematic cross section of a unit that employs a hydraulic eductor. Clean water from the effluent is pumped to a recirculation header …

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Dissolved Gas Units

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Dissolved gas designs take a portion of the treated water effluent and saturate the water with natural gas in a contactor. The higher the pressure the more gas can be dissolved in the water. Most units are designed for a 20 to 40 psig contact pressure. Normally, 20% to 50% of the treated water is …

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Free-Flow Turbulent Coalescers

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The gravity settling devices previously discussed make use of closely spaced internals to reduce the distance an oil droplet must rise to meet a coalescing surface. This is because within a tank or vessel there is verylittle turbulence to promote coalescence. The SP Pack, developed by Paragon Engineering Services and marketed by Modular Production Equipment, …

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Precipitators Coalescing Filters

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In the past, it was common to direct the water to be treated through a bed of excelsior or another similar medium, as shown in Figure 7-9, to aid in the coalescing of oil droplets. However, the coalescing mediumĀ  has a tendency to clog. Many of these devices in oil field service have the medium …

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Cross-Flow Devices

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Equipment manufacturers have modified the CPI configuration for horizontal water flow perpendicular to the axis of the corrugations in the plates as shown in Figure 7-8. This allows the plates to be put on a steeper angle to facilitate sediment removal, and to enable the plate pack to be more conveniently packaged in a pressure …

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Corrugated Plate Interceptor

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The most common form of parallel plate interceptor used in oil facilities is the corrugated plate interceptor (CPI). This is a refinement of the PPI in that it takes up less plan area for the same particle size removal, and has the added benefit of making sediment handling easier. Figure 7-6 illustrates a typical downflow …

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