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InLine Gas-Liquid Separation

InLine gas-liquid separation is the most mature inline technology. It has been installed in a large number of production systems since the first unit was put in operation in 2003. It was initially developed for debottlenecking of processing plants where it was difficult to solve specific operating challenges by conventional technologies.

Products

InLine DeGasser

InLine PhaseSplitter

InLine DeLiquidiser

InLine DeMister

InLine DeGasser
This technology is normally applied for the separation of gas from a liquid dominant multiphase stream. The InLine DeGasser is a pipe sement that first ensures extraction of the gas in from the liquid to produce a single phase liquid flow. Secondly, it ensures scrubbing of the separated gas such that a high quality single phase gas stream also escapes the unit. It is therefore a very compact separation tool to produce both high quality gas and liquid single phase streams.

Application 

The InLine DeGasser can be used in all kinds of applications where the operator wants to have a compact separation of the gas from a liquid dominant multiphase stream. To achieve the first stage gas-liquid separation at an upstream processing facility, it has been installed directly in a wellstream. The InLine DeGasser has also been installed to separate gas from a water stream as part of the produced water handling package.

Features and Benefits 
  • Compact: It offers an ultra compact method to achieve phase separation of a liquid dominant multiphase stream and installs easily into existing facilities as well as into the design of more compact new build processes.
  • Piping Code: Design is done according to piping code and there is no need for pressure vessel design codes. Compared to conventional vessel based solutions, this enables a much more compact total system as less additional equipment is required for the process system.
  • Short Delivery Time: The delivery time is short from order to installed equipment. The piping used is the long lead item, and has a substantially shorter lead time than conventional separator vessels.
  • Increased Production: Installation can easily be achieved in existing processes to enable debottlenecking and increased production rates.
  • Operating Flexibility: The technology is capable of handling inlet flow transients. It has already been in long-term operation at applications installed directly in multiphase wellstreams as the first stage separator at the processing facility.
  • Robust: Can be designed with no narrow openings and is therefore robust with respect to any potential clogging and foaling. There are also no elements that can fail due to erosion/wear.
  • Proven Technology: Several units have been in operation for many years with no failure.
Performance

The technology has the capability to simultaneously produce both high quality single phase gas and liquid streams. It applies cyclonic separation to generate high G-forces and achieve high separation performance, even in difficult operating conditions. This includes applications with viscous liquids. The design allows separation of 95 percent to 99.5 percent of the liquid in the inlet gas stream. The outlet gas stream can be constructed for a very low liquid-in-gas content which is of a similar quality as conventional gas scrubbers.

InLine PhaseSplitter
The InLine PhaseSplitter is applied for bulk separation of gas and liquid at inlet gas volume fractions typically ranging from around 10 percent to 90 percent. The separation is carried out in a single stage cyclone. A swirl element generates a cyclonic flow generating the G-forces required to establish a gas core in the center and a liquid film near the pipe wall. The gas is extracted from the center, the liquid from the annular film. The InLine PhaseSplitter is a true inline unit where the separation is carried out in a pipe spool.

Application

The InLine PhaseSplitter can be used for applications where it will add value to separate the gas and liquid phases in a very compact way. Separation characteristics:

  • Bulk gas-liquid separation of a multiphase stream ensures production of single phase streams of a relative low content of the other phase. Usually, there is less than one percent to five percent gas volume fraction in the outlet liquid stream, and less than one percent to five percent liquid volume fraction in the outlet gas stream. Applications can be splitting gas and liquid to route the two product stream to different downstream separators/pipelines or processing plants.
  • Polishing of a gas stream ensures separation of the liquid from the gas to a low liquid-in-gas content, while the separated liquid is routed to a downstream separator that can accept some liquid in the gas (less than five percent). An example of such an application is to install the InLine PhaseSplitter upstream of an existing three phase separator. Removing the majority of the gas upstream of the separator produces a good gas quality. This will allow for increased capacity of the downstream separator.
Features and Benefits
  • Compact: It offers an ultra compact way to achieve gas-liquid separation of a multiphase steam and installs easy into existing facilities as well as in design of more compact new build processes
  • Piping Code: Design is done according to piping code and there is no need for pressure vessel design codes. Compared to conventional vessel based solutions, this also enables a much more compact total system as less additional equipment is required for the process system
  • Delivery time: The delivery time is short from order to installed equipment. The piping used is the long lead item, and has a substantial shorter lead time than conventional separator vessels
  • Increased Production: Installation can easily be achieved in existing processes to enable debottlenecking and increased production rates
  • Proven Technology: Several units have been in operation for many years with no failure under a large variety of operating conditions
  • Performance

It is operated as a bulk separation unit, to simultaneously achieve a low gas-in-liquid and liquid-in-gas concentrations. It can be designed to achieve between one percent and five percent gas volume fraction in the outlet liquid phase while at the same time achieving a liquid volume fraction in the outlet gas phase of about one percent to five percent. Higher efficiency can be achieved for one of the phases if a lower efficiency can be accepted for the other.

The InLine PhaseSplitter can be modified to function as an InLine DeGasser or InLine Deliquidiser by adding second stage separation to ensure simultaneous high quality liquid and gas streams.

InLine DeLiquidiser
By use of high G-forces caused by cyclonic flow, the InLine DeLiquidiser separates liquid from a gas stream. It is normally applied for inlet gas volume fractions of 90 percent to 99.5 percent, but is also applicable for higher inlet liquid fractions by taking into account special design considerations for the handling of liquid. It includes a main separation section where the liquid is extracted from the gas to produce an inlet single phase outlet stream. The liquid is handled in a liquid outlet section to also produce a high quality single phase liquid stream. Therefore the unit is fully capable of producing two single phase outlet streams from one multiphase inlet stream.

In 2004, FMC Technologies received the Spotlight on New Technology Award for the InLine DeLiquidiser at the Offshore Technology Conference (OTC) in Houston.

Application

It is attractive both for new-build processes and for debottlenecking and upgrading existing separation plants to optimize their performance. It can be manufactured from any material used in offshore applications and is also suitable for subsea installation. If sand is expected, erosion can be prevented by applying a coating such as tungsten carbide. The InLine DeLiquidiser has a significantly shorter delivery time than a conventional separation vessel and the installation cost and down time is minimized.

Features and Benefits

  • Compact: It offers an ultra compact way to achieve separation of liquid from a gas stream and installs easily into existing facilities as well as into the design of more compact new build processes.
  • Piping Code: Design is done according to piping code and there is no need for pressure vessel design codes. Compared to conventional vessel based solutions, this also enables a much more compact total system as less additional equipment is required for the process system.
  • Delivery time: The delivery time is short from order to installed equipment. The piping used is the long lead item, and has a substantial shorter lead time than conventional separator vessels.
  • Increased Production: Installation can easily be achieved in existing processes to enable debottlenecking and enable increased production rates.
  • Proven Technology: Several units have been in operation for many years with no failure under a large variety of operating conditions.
  • Robust: Can be designed with no narrow openings and is therefore robust with respect to any potential clogging and foaling. There are also no elements that can fail due to erosion/wear.
  • Performance

The technology has the capability to simultaneously produce both high quality single phase gas and liquid streams. It applies cyclonic separation to generate high G-forces and achieve high separation performance also for difficult operating conditions. This includes applications with high pressures. It is typically designed to separate 95 percent to 99.5 percent of the liquid in the inlet gas stream. The outlet liquid stream will be single phase due to the second stage separation in the liquid outlet boot.

InLine DeMister
The highly efficient compact gas demisting technology is designed to remove the smallest droplets from the gas stream and produce a gas phase that can enter sensitive equipment and processes such as gas compressors and other gas treatment processes. The inline unit consists of CDS SpiraflowTM arranged in a bundle within a pipe spool to achieve similar demisting separation performance as a conventional scrubber, but in a much more compact way.

Application

The technology can be used at any application where a very high gas quality stream is required, e.g. for gas entering gas compression and treatment processes. Typical applications can be:

  • InLine DeMister in combination with other InLine Technologies, downsteam of an InLine PhaseSplitter to produce a very clean gas stream
  • Installation of the InLine DeMister downstream an existing scrubber that experience high liquid cary over
  • Demisting of a low liquid content gas production stream where a large scrubber is not needed – but where fine demisting is required
Features and Benefits
  • Compact: It offers a very compact method of achieving fine separation of small quantities of liquid droplets from a gas stream. It installs easily into both existing facilities as well as more compact new build processes.
  • Delivery time: The delivery time is short from order to installed equipment. Compared to conventional separator vessels it has a substantially shorter lead time.
  • Increased Production: Installation can easily be achieved in existing processes to enable debottlenecking and increased production rates.
  • Proven Technology: Several units have been in operation for many years with no failure under a large variety of operating conditions. We have an extensive track record for delivering this kind of technology through numerous deliveries of SpiraflowTM demisting cyclones.
  • Performance: Through compact, high performance gas demisting, gas qualities required for gas compressors and gas treatment processes can be achieved.