FLNG Facilities
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Transcript of FLNG Facilities
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Floating LiquefiedNatural Gas (FLNG)
Facilities09NA1010 P Pratheek Kumar09NA3011 D Sandeep
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What is FLNG?
Refers to water-based liquefied natural gas (LNoperations employing technologies designedenable the development of offshore natural resources
FLNG is a revolutionary technology that alloaccess to offshore gas fields that would otherwbe too costly or difficult to develop
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What is FLNG?
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FLNG in current scenario...
No FLNG facilities currently exist
A facility is in development by Royal Dutch Shand is due to be completed by around 2017
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FLNG Working Principle
Floating above an offshore natural gas field, FLNG facility will theoretically produce, liqustore and transfer LNG (and potentially LPG condensate) at sea before carriers ship it directlymarkets
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FLNG Working
The FLNG facility will be moored directly above natural gas field
It will route gas from the field to the facility via ris
When the gas reaches the facility, it will processed to produce natural gas, LPG, and natgas condensate
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FLNG Riser Mechanism
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FLNG Working
The processed feed gas will be treated to remimpurities, and liquefied through freezing, befbeing stored in the hull
Ocean-going carriers will offload the LNG, as we
the other liquid by-products, for delivery to markworldwide
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FLNG Working
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FLNG Construction
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Conventional method LNG Production
The conventional alternative to this wouldto pump gas through pipelines to a shbased facility for liquefaction, beftransferring the gas for delivery
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Conventional method
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Underwater pipelines
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Underwater pipelines
One of the major hurdles for laying underpipelines is the topography and distance
The more rough and rocky the underwater terrainthe more expensive and complex the pipe
construction Beyond its topography, pipeline engineers have
take into account the sub-zero temperatures of ocean floor and stormiest waters and strongcurrents
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Advantages/Uses of FLNG
Natural gas is the cleanest-burning fossil fuel
It is also abundant and affordable and may be ato meet world energy needs by realising potential of otherwise unviable gas reserves
FLNG technology also provides a number environmental and economic advantages
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Advantages - Environmental
Because all processing is done at the gas field, this no need to lay long pipelines all the way to shore
There is also no requirement for compression u
to pump the gas to shore, dredging and jeconstruction or the onshore construction of an Lprocessing plant, all of which significantly redthe project's environmental footprint
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Advantages - Environmental
Avoiding construction also helps preserve maand coastal environments
Additionally, environmental disturbance wouldminimised during the later decommissioning of
facility, because it could be disconnected easily removed before being refurbished and re-deploelsewhere
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Advantages - Economic
Where pumping gas to shore can be expensFLNG makes LNG production economically viable
As a result, it will open up new businopportunities for countries to develop offshore
fields that would otherwise remain stranded, sas those off the coast of East Africa
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Challenges associated with FLNG
Moving LNG production to an offshore settpresents a demanding set of challenges
In terms of the design and construction of the FLfacility, every element of a conventional LNG fac
needs to fit into an area roughly one quarter size, whilst maintaining the utmost levels of safand giving increased flexibility to LNG production
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Challenges associated with FLNG
Product transfers also need to deal with the effeof winds, waves and currents in the open seas
Many solutions to reduce the effect of motion weather are again to be found in the design, wh
must be capable of withstanding
and ereducing the impact of waves
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Further Advancements...
In this area, technological development has bmainly evolutionary rather than revolutionleveraging and adapting technologies that currently applied to offshore oil productiononshore liquefaction
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Further Advancements...
For example, loading arms have been adapted different sea/ocean conditions as:
Traditional LNG loading arms in open water
Hose-based solutions for both side-by-side transf
in calmer seas
Tandem transfers in rougher conditions
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Tandem Loading
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Further Advancements...
The cold of the ocean depths can also be utilizedpumping water to help cool the gas, avoiding need to for extra equipment on deck
The Components of the facility can be stac
vertically to save space; the operating plant, example, can be placed above LNG storage tanks
The sheer size of the full-scale facility could be uto withstand very high winds and giant waves
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Prelude FLNG - SHELL
The floating facility will chill natural gas produced afield to 162C, shrinking its volume by 600 times so be shipped to customers in other parts of the world
Ocean-going carriers will load the LNG as well as liquid by-products (condensate and LPG) for delive
market. The Prelude FLNG facility will be 488m long, 74m wid
will displace around 600,000 tonnes of water. It will blargest floating offshore facility in the world
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Prelude FLNG - SHELL
The Prelude FLNG facility will be built at Samsung HIndustries Geoje Island ship yards in South Korea
Once constructed, the facility will be towed to its locaapproximately 475 kilometres north-northeast of BroWestern Australia.
The facility will be moored and hooked up to the undinfrastructure and the whole production sycommissioned.
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Prelude FLNG - SHELL
The Prelude FLNG facility has been designedwithstand the most powerful tropical cyclo(Category 5)
It will remain moored at the location for around
years before needing to dock for inspection overhaul
In addition, it will be secured in place by one of largest mooring systems in the world
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Conclusion
FLNG technology provides an efficient solutionthe development of remote offshore gas fields
It can be more economic than a offshore productfacility plus a pipeline and an onshore LNG plant
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