Veolia Water Technologies Techno Center Netherlands B.V. - MPP Systems

- Model pCPI - Pressurized vInterceptor

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The TiPSS CPI Pressurized is applied when the oil (or any non water miscible organic fluid) and solids contaminated feed water is pressurised or a fully contained plate pack is required (offshore).

Reducing the feed water pressure (by reducing valve ore other obstructions) results in turbulent conditions. Turbulence will reduce the oil droplet and solids particle size. Smaller droplets/particles are significantly more difficult to separate. When applying a TiPPS CPI pressurized the pressure is reduced downstream, thus turbulent conditions upstream can be avoided.

The plate packs can be executed in (corrugated) GRP or various steel (alloys). VWS MPP Systems has a unique standarised plate pack design that is flexible and economical.

  • Produced water (off- and onshore)
  • Refinery in-process flows or effluents
  • (Petro)chemical in-process flows or effluents

  • Oil globules cut off diameter 10-60 µm and larger
  • Oil removal 99%
  • Residual 10 - 30 ppm free and separable oil
  • TSS removal 90-95%
  • Free gas 90-99%

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Cross Flow Interceptor system for multi phase (pressurised) gravity separation of gas, oil, water and/or solids from a carrier flow

  • Based on Shell DEP 31.22.05.11
  • DEP 31.22.05.12

Advantages of the pCFI system

  • no moving parts
  • high separation efficiency in a multiphase environment
  • compact construction gives great economy in space and foot print
  • short hydraulic retention time
  • continuous operation
  • insensitive to high temperature, high pressures and composition of the liquid to be treated
  • low installation, transport costs on site since units come in knock-down configuration
  • standardised construction, thus quick supply
  • custom made
  • minimum maintenance costs; high rigidity
  • uniformity in design guarantees quick delivery of equipment and spares

A VWS MPP Systems BV product based on a proven design.

Performance

  • oil globule cut off diameter: 10 - 30 [jm
  • oil removal: 90 - >99%
  • typical effluent O&G levels: 10-20 ppm (free and separable oil)
  • TSS removal 80 - >90%
  • free gas 95 - >99%

Gravity separation is the most straightforward method of effluent treatment and is, therefore, utilised widely in industry for the separation of settling and/or flotable impurities from a carrier liquid. In the majority of cases the separators are constructed in the form of a rectangular tank.

The effectiveness of such a tank depends theoretically upon its net separation surface (A) and the amount of water to be treated (Q). The ratio Q/A is called the overflow rate. The rising or settling velocity of a discrete particle with a diameter d can be indicated by Stokes' law:

All particles or droplets having a settling or flotation velocity VS>Q/A are fully intercepted, while a portion of the smaller particles will be captured also in a ratio of (d/ds)2 x 100%.

An enlarged separating surface is achieved by placing various smaller planes on top of each other in the vessel. If these planes are subsequently inclined in a tilted position, material separated between the plates is removed by the gravitational force. This is the working principle behind the pCFI corrugated plate pack.

VWS MPP Systems BV offers a wide variety (gravity based) separation equipment, like the pCFI.

Pressure Cross Flow Interceptors are applied to separate two or more immiscible liquids, solids and, when present, gas in a vessel at moderate or high pressure simultaneously. In the pCFI separator the continuous phase flows horizontally in a direction perpendicular to that of the particles to be separated.

Plate packs are installed to improve separation efficiencies and/or to enlarge the separation capacities of existing separator vessels. Packs can be mounted without hot work in this existing vessel when necessary.

  • oil and gas fields (3-phase, 2nd stage separation, crude dehydration)
  • offshore platforms
  • oil terminals
  • tank storage areas
  • oil refineries
  • revamps, debottlenecking
  • petrochemical and chemical industries
  • oil spill clean-up
  • ballast water

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Which amount of plate pack separator surface to choose?

In determining a design, the following minimum data are essential:

  • the type of phases to be intercepted/segregated
  • the  separation  diameter,   or  even   better the particle size distribution
  • the difference  in density between the carrier liquid and the phases to be intercepted
  • the (maximum) amounts of each phase to be treated
  • other physical data (temperature, viscosities)
  • origin of the liquid
  • physical data, chemical analysis of carrier phase and secondary phases.

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Selection of pCFI plate packs

Each    process    flow    has    its    own    individual characteristics; one phase in the other can occur either as a dispersion, an emulsion or a solution and the particle size distribution differs from case to case. For this reason, specific process analyses and design calculations must be made for each individual application.

It is fundamentally impossible to separate dissolved or dispersed components from the aqueous phase by means  of gravity only.  (A  physical-chemical treatment or biological treatment, might make this however possible.) Liquid   data   like   salinity,   temperature   and   pH determine  the  choice   of  materials,   most  often stainless steel.

The   following    plate   pack    configurations   are possible:

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Process Flow description pCFI system

The principle of a horizontal pCFI is shown in figure 8. The   blend   of  phases  flows   into the  separator through   a   flow   stabilisation   and   primary   bulk separation compartment (1).

A distribution baffle (2) induces the incoming water to flow evenly and uniformly to the entrance of the plate pack (3). In the plate pack, the secondary phase and, if present, other discrete phases, are intercepted- They leave the pack in a perpendicular flow direction and collect respectively beneath the pack in the heavy fraction collection zone (6), or on top of the pack in a light fraction layer (7) cq gas zone.

The  settled   material  is  discharged  intermittently with the aid of pneumatic operated valves into a sludge collection vessel. The floating oil layer is discharged via an oil weir (4). The gas is discharge via the gas outlet (5).

The main phase leaves the pack at the back of it and is discharged over an adjustable weir (8).

The VWS MPP Systems BV scope of supply can be:

  • turnkey deliveries
  • process studies
  • design
  • engineering
  • erection
  • installation, commissioning and start-up
  • after sales service
  • laboratory and field research
  • pilot plants.

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