Guide to FPSO (Floating Production Storage and Offloading)

What is FPSO? Floating Production Storage and Offloading is a core element of the oil & gas extraction and refinement process. Here is everything you need to know about FPSO.

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Adam Muspratt



What is FPSO?

At its core, an FPSO facilitates the processing and storage of oil and gas at sea.  

It stands for floating production storage and offloading (FPSO). These vessels are used extensively by the offshore industry and have become one of the primary methods of oil and gas processing and storage. As its name suggests, an FPSO is a floating vessel that acts as a mobile offshore production and storage facility. They are typically employed and leased by oil and gas companies.  

The vessels themselves are equipped with processing equipment for the separation, storage and offloading of oil and gas that comes from sub-sea oil wells or platforms. When oil and gas is processed, it is safely stored in the FPSO until it can be offloaded onto a tanker or a pipeline for transportation ashore.  

Origins of FPSO

The first FPSO was a converted oil tanker, built by Shell in 1977. Before the time of FPSOs, oil and gas extraction was more difficult and inefficient. Companies were only able to extract oil and gas from shallow fields, no more than a water depth of 50 metres. Oil and gas had to be transported to land via a subsea pipeline, which is economically unviable at water depths more than several hundred metres and in instances where the seabed oil and gas fields are hundreds of miles away from the shore.  

SEE ALSO: Introduction to the Oil and Gas Industry 

Oil and gas awaiting transport was stored in tankers called floating storage and offload units (FSO). FSOs were used to store extracted hydrocarbons (a mixture of oil, gas and water) and transport it from remote locations such as distant seabeds. However, FSOs can’t process oil and gas, which is where the FPSO comes in.

FPSO definition 

As onshore oil discoveries continue to decline, FPSOs will become increasingly more vital for the oil and gas industry. There are more than 200 FPSOs today operating around the globe. They're less expensive than traditional offshore oil and gas platforms, more flexible, safer, and time-efficient. Here is a breakdown of the FPSO acronym:


  • Production – The “P” in FPSO is what separates these vessels from FSOs. Production refers to the processing of oil and gas. Hydrocarbons are produced in seabed wells and this is transported to the FPSO via flowlines and risers. The hydrocarbons are then separated into oil, gas, water and impurities via the production facilities on the deck of the FPSO.  

    • Flowlines – Flowlines carry hydrocarbons directly from seabed well. These can be flexible or rigid.

    • Risers – Developed for vertical transportation. This is the section of the line from the seabed to the topside.

  • Storage – Once the oil has been processed, it is transferred to cargo tanks in the double hull of the vessel.

  • Offloading – Offloading refers to transferring the gathered contents to additional transfer conduits. Crude oil that is stored in the vessel is then transferred to tankers and pipelines heading ashore. Gas is either transported to the shore via pipeline or recycled back into the field to increase production.


FPSO design

In terms of design, most FPSOs take the form of a supertanker and it can be difficult to distinguish between the two. The defining visual difference of an FPSO is the processing equipment that is stored aboard the vessel’s deck. Meanwhile, hydrocarbon storage facilities are typically situated  below the hull.

SEE ALSO: Guide to shutdowns and turnarounds.

Traditional tankers can be converted to an FPSO, giving them an additional element of flexibility. In terms of mooring, the FPSO vessels can be anchored to multiple points on the sea floor, which is called spread morning, or via a central weather vane.


With oil prices rising and after almost a two year period of absent orders, the market is finally seeing an uptick. Check out our free FPSO State of the Nation Report

In addition to oil and gas processing equipment, FPSOs can be expected to have living quarters to provide accommodation for staff during long periods out at sea, along with control rooms, offices and recreational facilities.

(A FPSO oil rig. Coast of Brazil. Image: Shutterstock)

Here is a rundown of the core components of an FPSO vessel.


  • Spread mooring: Spread mooring is a traditional mooring system, incorporating a number of mooring lines attached to the hull of the vessel. These mooring lines are anchored onto the seabed.

  • FPSO turret (weathervaning) – The turret is integrated into the FPSOs hull, so the hull weathervanes around the mooring system and the mooring line. This enables FPSOs to position the vessel favourably against the wind so that it remains bow to wind and weather.

    A turret mooring system is critical for harsh weather conditions. In essence, the turret enables the FPSO to freely rotate while moored to various locations on the seafloor. 

  • Detachable FPSO turret - Many turret systems allow the turret to be disconnected from the vessel, but remain attached to the mooring lines on the seabed. This is particularly useful in situations such as hurricanes and storms, where the vessel needs to react quickly to external hazards.  Once the threat has been mitigated, the FPSO can return to the turret, reattach and continue operations. This mooring system is by far the most flexible.

SEE ALSO: Is North Sea running out of oil and gas? Quite the opposite

  • Gas dehydration – Gas is often saturated with water vapour, which poses a threat to facilities. Gas dehydration removes the water that is associated with natural gas.

  • Gas compression – Natural gas must be treated to conform to commercial standards.

  • Water injection – Water injection is a process where water is introduced into a reservoir to encourage oil production.

  • Gas, water and oil separator – As water, gas and oil have different densities, they can be separated with gas rising to the top, water on the bottom and oil staying in the middle. Additional debris such as sand will settle at the bottom.

  • Seawater treatment – Sea water treatment involves removing sulfates and other unwanted elements from injection water.


Benefits of FPSO

Why have FPSOs become so important for oil & gas companies?

Conceptually, FPSOs have given oil and gas companies a lot of freedom and versatility with regards to exploration and extraction. FPSOs enables companies to produce oil & gas and explore increasingly remote areas at a cheaper price in comparison to traditional offshore oil and gas production and storage methods. 

FPSOs have six key advantages.


  1. Time – FPSOs can connect to any pipeline. In addition, when an existing oilfield is depleted, an FPSO can move to another location. This saves time and money and mitigates the need to build expensive permanent pipelines and facilities. As such, FPSOs make an ideal solution for smaller oil and gas fields that will be depleted in a matter of years.

  2. Cost – With FPSO, O&G companies are not required to build permanent structures like pipelines and piled buildings. FPSOs have the capability to store processed oil and gas and offload it to shuttle tankers for transportation to refineries.

    According to Investopedia, a purpose-built FPSO can cost north of $800 million, especially if their production capabilities exceed 250,000 barrels per day (BPD). Meanwhile, a traditional offshore oil platform can cost up to $650 million. While the initial cost of an FPSO is slightly higher, FPSOs prove to be more cost-effective in the long run.

    The cost of a traditional offshore oil platform can skyrocket when other expenditures are taken into account, such as maintenance, well completion costs and platform decommissioning costs. 

  3. Safety – FPSOs can be disconnected from the pipelines and oil wells they are moored to. This makes FPSOs a safer option in areas with severe weather conditions.

  4. Convenience – Oil producers can lease the vessels, giving oil and gas companies greater flexibility over their assets ensuring they can react to market forces. An oil and gas producer can conceivably lease as many or as little FPSOs as they want. This kind of flexibility isn't feasible with fixed assets which take years to build and finance. This not only saves costs but it bridges the gap between small and large oil and gas organisations, ensuring healthier competition.

  5. More viable fields - Some oil and gas fields lack commercial viability due to weather hazards, the distance to the shore or the cost-inefficiency of building and maintaining traditional infrastructure. FPSOs mitigate this by being insensitive to deep-water and adverse weather.

  6. Storage capabilities – FPSOs can store a substantial amount of oil and gas, increasing the commercial viability of hard to reach fields.



Limitations of FPSO

While there are numerous advantages to FPSO, it does have a few limitations.



  • Conversion time – Converting a tanker into an FPSO can take up to two years. While this is something to consider, it is still substantially faster than building a pipeline.

  • Self-competition – Companies may find that they are competing with their own pipeline-based infrastructure.

  • Initial Cost – The upfront cost of an FPSO can be more than the cost of building a large fixed offshore platform.


FPSO Recovery: Oil & Gas projects in 2018 at a glance

When the oil and gas market collapsed in 2014, floating production systems weren’t spared. Two years went by without a single FPSO order. However, the oil and gas industry is well into its recovery period and optimism continues to grow at a substantial rate. This has resulted in a positive outlook for many areas of the sector, including floating production systems.

Since 2016, 13 FPSOs have been ordered. In 2018 three have already been ordered, with a high possibility for an additional 10 by the end of the year. The gradual recovery that occurred throughout 2017 will likely continue until FPSO orders reach pre-crash levels, as oil prices continue to re-balance.

According to some reports, the number of FPSOs being ordered over the next five years has the potential to be as high as 150+.

SEE ALSO: Five ways redeploying your FPSO will pay dividends

As new oil and gas fields are discovered there will always be a demand for FPSO vessels. Here is a breakdown of upcoming projects and new discoveries awaiting exploitation.


  • Libra Block
    Location: Offshore Brazil
    Estimated barrels of oil: 12 billion

    The Libra oil field is one most significant oil and gas discoveries in recent years. Located 110 miles off the coast of Rio de Janeiro in the pre-salt Santos basin in Brazil. The Libra Field may hold an estimated 12 billion barrels of oil – making Brazil one of the foremost oil producers. The project is operated by Brazil’s state-controlled oil company Petrobras.

    Petrobras announced the first oil the huge field in late 2017. An FPSO Pionero de Libra is operating in the field as an early production system (EPS). The FPSO, which has a capacity of 50,000 barrels of oil, will appraise the field while generating early revenue. Libra will be a major asset in an oil and gas company’s portfolio, with 2019 looking to be the year where the oil field begins to kick into gear. At the moment, the oil field is operated by a consortium including Total, Shell, SNOOC, and CNPC.

    • Mero
      Location: Offshore Rio de Janeiro
      Estimated barrels of oil:
       3.3 billion

      Situated 180 kilometres off the Rio de Janeiro coast, in ultra-deep waters. The first FPSO introduced to Mero will be the Guanabara MV31, capable of processing 180,000 barrels of crude oil per day. The first oil is expected in 2021.

  • Johan Catsberg Project
    Location: Offshore Norway
    Estimated barrels of oil: 558 million

    With an estimated 558 million barrels of oil, the Johan Catsberg project is a huge opportunity for the Norwegianoil and gas industry. Planned production is expected to start in 2022, with the production period lasting 30 years. The development plan is being headed by Norwegian multinational oil and gas company Statoil, who will be their largest ever FPSO.

    In late 2017, Singapore’s Sembcorp Marine secured the contract to build the hull of the FPSO for the Johan Catsberg Field.


  • Coral South LNG
    : Offshore Mozambique
    Estimated gas reserves: 440 billion cubic meters

    With such a sizeable reserve, it is no surprise that the biggest oil and gas players are flocking to get involved in the extraction process. Eni East Africa holds the highest operating interest, holding a 50 per cent operating interest in the field. In 2017, Eni and ExxonMobil signed an agreement to enable ExxonMobil to acquire a 25 per cent interest in the field.

    All of the gas that is produced will be purchased by BP who has the right to purchase the Coral South Field gas for the next 20 years. In 2017, Eni along with the Mozambique government sanctioned the production of an advanced floating liquid natural gas vessel (FLNG) to extract the gas deposits.

  • Southern Gas Corridor
    : Caspian Sea
    Estimated gas reserves: 400 billion cubic meters 

    Heralded as an alternative to Russian gas delivery routes for many European Union  nations, the Southern Gas Corridor will be watched by the world due to the geopolitical concerns surrounding the huge gas corridor.

    The Southern Gas Corridor will require a costly pipeline to Europe that crosses through Azerbaijan, Georgia, and Turkey. Recently, the President of Azerbaijan Ilham Aliyev launched the first phase of the Southern Gas Corridor project, which will be supplied with gas from the BP field in the Caspian Sea.

  • Penguins
    Location: North Sea
    Estimated barrels of oil: 80 million 

    Jointly owned by Shell and ExxonMobil, this field is located east of the Shetland Islands. First discovered in the 1970s, this field was sanctioned to be redeveloped in 2018, with updated facilities, an additional FPSO and the additional drilling of eight wells.

  • Rosebank
    North Sea
    Estimated barrels of oil: 300 million 

    Primarily operated by Chevron, this oil field was discovered in 2007 but development plans were stalled due to harsh environmental conditions. Chevron is in the process of relaunching the development of this undeveloped field as they prepare for major commitment in 2018. 
  • Sea Lion
    Location: Offshore Falklands 
    Estimated barrels of oil: 242 million

    Owned by Rockhopper Exploration, this field was discovered in 2010. There are currently no development plans in place, but Rockhopper expects final investment decision for the $1.5 oil field will be made in 2018,

Additional oil & gas fields to watch in 2018

  • Liza 2,3 and 4
    Location: Offshore Guyana
    Estimated barrels of oil: 3.2 billion


  • Barossa
    Location: Offshore Australia
    Estimated gas reserves: 3.7 million tonnes (Mt) of liquefied natural gas


  • Tortue
    Location: Offshore Gabon
    Estimated barrels of oil: 1 billion


  • SNE
    Location:Offshore Senegal 
    Estimated barrels of oil: 664 million


  • Browse
    Location: Offshore Australia 
    Estimated gas reserves: 4 trillion cubic meters 


Related systems: Types of floating storage unit

There are a wide array of offshore vessels and design variants of the FPSO. Here is a rundown of the most popular deviations.

  •  Floating production systems (FPS) – FPS is an umbrella term for all variants of floating production systems, including vessels and platforms

SEE ALSO: Delivering cost-effective FPSOs in the current oil price market

  •  Floating storage and offloading (FSO) – An FSO is a simplified version of an FPSO. It has the capability to store and offload oil and gas but it doesn’t possess the ability to process it.

  • Floating storage units (FSU) – Floating storage units to take the form of a large barge in contrast to supertankers that are associated with FPSOs. Simply put, these units are used to store oil and gas in large silos placed on top of the vessel.

  • Floating drilling production storage and offloading (FDPSO) – This variant is still relatively new, with the first of its kind setting sail in 2009. The key difference with this vessel is the modular drill that is attached to the hull of the ship, giving it more utility than a standard FPSO. With the addition of a drill, an FDPSO can perform nearly all major functions associated with offshore oil and gas production.

  • Floating liquid natural gas vessel (FLNG) – A FLNG is a type of vessel that is more gas-centric. It has all of the apparatus to enable offshore liquidification of natural gas into liquefied natural gas (LNG).



Digitization: the future of FPSO

Like many other sectors, oil and gas is experiencing the steady digitization of operational procedures to promote efficiency and save costs. However, unlike other industries, oil and gas has been slow to adopt increased connectivity and the technologies associated with the Internet of Things (IoT).


Digitization is transforming the industry and saving billions: Check out this free report for all the details

The rapid conversion of operational technology (OT) and information technology (IT) has resulted in increased efficiency through big data, analytics, sensors, the ability to automate highly sensitive tasks and more.

Going forward, FPSOs will likely have to incorporate more digitisation. From fleet data to analytics tools and predictive analytics, these technologies can be used to determine success rates, estimations of topside components and more.

Monitoring technologies are far better now than they were many decades ago when most FPSOs were commissioned. The digitization of FSPO has helped prolong the shelf life of many older vessels. Companies now have a better grasp measuring the fatigue of vessels and how each project impacts a vessels service life. Organisation now has data on hulls, mooring systems, processing equipment and everything in between.

Not only does this lead to intact components of a vessel being recycled, but the data produced also leads to more efficient designs.

The oil and gas landscape is changing fast. View the webinar on how digitization and security are entwined



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