OF

Disc stack separators designed for the high demands of the Oil & Gas industry

Based on the long-term cooperation with the Oil & Gas industry, the Alfa Laval OF series are specially designed towards the tough industry conditions. Thanks to the internal disc stack along with the efficient centrifugal force, the most challenging oil feeds can be treated with the OF range of separators. This allows our customers to achieve higher production efficiency with low operating costs.

Reliable separation with superior performance

  • Robust and reliable design - based on well proven technology
  • Compact footprint for easy integration
  • Low operating and maintance costs
  • Minimal filter and sludge disposal
  • Prolongs equipment lifetime

The gentle acceleration of the feed keeps the feed droplets or particles intact, which results in superior separation performance, especially when handling emulsions or shear-sensitive particles. The gentle flow conditions and short settling distances help ensure a low hold-up volume and keep the footprint to a minimum. The OF disc stack separators can be installed both on and offshore, either on fixed platforms or on floating vessels. They can be provided as stand-alone units or as complete and customized solutions.

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Introducing the new OF 900 - Fully hermetic design

The Alfa Laval OF 900 centrifugal separator takes separation to a new level thanks to the innovative design of its flow path. The center-to-center principle ensures gentle acceleration into the high G-force separation environment inside the disc stacks. With this flow path design, Alfa Laval OF 900 uses 30% less power than conventional centrifugal separators. The OF 900 separator are designed and optimized for separation of solids from fluids, such as condensate, oil or water, with specific focus on dangerous contaminants and clarification of MEG.

 

Benefits

  • No shear acceleration ensures product integrity
  • Small hold-up volume
  • Fully hermetic design – no gas flashing and no need for upstream degassing
  • Low power consumption compared with conventional solutions

Increase your separation efficiency at low energy consumption in completely enclosed operation

The central bottom feed creates a liquid-filled, low-shear environment. The gentle acceleration of the feed keeps the feed droplets or particles intact, which results in superior separation performance, especially when handling emulsions or shear-sensitive particles.

The gentle flow conditions and short settling distances help ensure a low hold-up volume and keep the footprint to a minimum. The gas-tight design of the center-to-center flow fully encloses the process liquid and eliminates the risk of flashing.

Want to learn more about OF 900?

You can read more about the efficiency, practicality and technical details of the OF 900 centrifugal separator by downloading the Product leaflet.

Seeking superior separation?

If you are looking for superior separation performance for problem feeds such as oils, water and glycols, contact Alfa Laval today to learn more about our robust and cost efficient solutions.

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OF 700

Alfa Laval OF 700 separator

High capacity centrifuge for the Oil & Gas industry.

  • Maximal separation performance
  • Low power consumption
  • High corrosion resistance
  • Designed for flexibility – performs well in different conditions
  • Semi-hermetic design – optimized for oil & gas processes
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OF 500

Alfa Laval OF 500 separator

Three phase disc stack centrifuge for oily water treatment

  • Highly efficient with compact design
  • Simultaneous, three phase separation of oil and solids
  • Complete and ready-to-go system for simple installation
  • Stable separation regardless of fluctuations
  • Built for easy servicing

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The OF series

The Alfa Laval disc-stack centrifuge efficiently separates the solid and liquid phases from each other. Traditional settling tanks use gravity to separate phases. Due to the high rotational velocity, the Alfa Laval centrifuge separators speed up separation by 5,000 times using centrifugal force instead of just gravity.

The force presses heavy particles outwards against the separator walls. The disc stack inside the separator bowl ensures lighter particles follow the heavier ones instead of the liquid, making separation more precise and efficient.

 

> Discover more about Alfa Laval's innovative separator technology

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OF 900 working principle

The feed enters the separator bowl from the bottom via the drive spindle. Separation takes place between the bowl discs where the liquid phase gravitates towards the center of the bowl and the solids move towards the periphery.

The gas-tight design of the center-to-center flow fully encloses the process liquid and eliminates the risk of gas flashing.

The separated liquid leaves the bowl through the hermetically sealed outlet at the top of the separator and is further boosted by an impeller.

The solids are discharged via the discharge ports when the sliding bowl bottom moves downwards. Discharged solids leaves the separator via the sludge cyclone.

 

Typical bowl drawing of a hermetic clarifier unit that separates solids from a liquid without flashing of gas.

  1. Inlet
  2. Distributor
  3. Disc stack
  4. Liquid phase outlet
  5. Sliding bowl bottom
  6. Solids ports
  7. Solids outlet from cyclone

OF 700 working principle

The feed is introduced into the rotating centrifuge bowl from the bottom via the hollow bowl spindle and accelerated in a distributor before entering the disc stack.

The separation takes place between the discs. The light liquid phase moves towards the center of the bowl where it is pumped out under pressure by means of a built-in paring disc. The heavy liquid phase moves towards the periphery, flows over a top disc and is pumped out by means of a paring disc.

The heavy solids phase is collected at the periphery of the bowl where it is discharged intermittently via the cyclone.  The solids are discharged via the solids ports through the cyclone. 

 

Typical semi-hermetic bowl for a solids-ejecting three-phase centrifuge.

  1. Inlet
  2. Distributor
  3. Disc stack
  4. Light liquid phase outlet
  5. Heavy liquid phase outlet
  6. Sliding bowl bottom
  7. Solids ports

 

OF 500 working principle

The feed is introduced into the rotating centrifuge bowl from the top via a stationary inlet pipe and accelerated in a distributor before entering the disc stack.

Separation takes place between the discs. The light phase moves towards the center of the bowl, where it is pumped out under pressure by means of a built-in paring disc. The heavy phase moves towards the periphery of the bowl, then along the upper side of the top disc to a paring chamber, from where it is pumped out under pressure by means of a built-in paring disc. 

The solids phase is collected at the periphery of the bowl, where it is discharged intermittently via the centrifuge cyclone.

 

 

Typical bowl for solids-ejecting concentrator centrifuge

  1. Inlet
  2. Distributor
  3. Disc stack
  4. Light liquid phase outlet
  5. Top disc
  6. Heavy liquid phase outlet
  7. Sliding bowl bottom
  8. Solids ports
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Learn more about our OF separators

If you are looking for superior separation performance for problem feeds such as oils, water and glycols, contact Alfa Laval today to learn more about our robust and cost efficient solutions.

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