Wärtsilä Hydrocarbon Blanketing Systems

The Wärtsilä Hydrocarbon Blanketing System is designed to use hydrocarbons as blanket gas for the cargo tanks during loading and offloading of the oil.

Using hydrocarbons as blanket gas allows:

  • Reducing air emissions (hydrocarbons, CO2, CO).
  • Establishing a safer and healthier working environment by preventing the vent gas from cargo tanks falling onto the main deck.
  • Increased profits thanks to reduced flashing of the oil during loading.

The system can be tailored for different process conditions and requirements (international, client and classification society). It can also be combined with Wärtsilä’s flare gas recovery, the Wärtsilä GasReformer, and Wärtsilä’s flare ignition systems.

    Technical data
    Project name Location Installation Technology Equipment Suction pressure Discharge pressure Capacity (per machine) Dimensions (LxWxH) Year
    Egina, Total Nigeria Nigeria FPSO Hydrocarbon blanket and flare gas recovery - 3 x 50% Blower package 0.04 barg 1 barg 3990 Sm3/h 12m x 7m x 6m -
    Quad 204, BP West of Shetland (UK) FPSO Hydrocarbon blanket and flare gas recovery - 2 x 50% Liquid ring compressor 1 bara 2 bara 2450 Am3/h 10m x 5m x 5m 2014
    Presalt P-66, Petrobras Brazil FPSO Flare gas recovery - 2 x 50% Liquid ring compressor and Flare Closure Arrangement 0,5 barg 7,5 barg 1400 m3/h 11m x 5.5m x 4.6m 2013
    Greater Ekofisk Area, Eldfisk II, 2/7s New Wellhead North Sea (Norway) Platform Flare gas recovery Ejectors package and Flare Closure Arrangement 0,15 barg 13,6 barg - Flare flow = 200 Sm3/h
    - Motive gas = 11700 Sm3/h
    5m x 3m x 4,15m 2013
    Knarr, Petrojarl Teekay (BG Group) North Sea (Norway) FPSO Hydrocarbon blanket and flare gas recovery 1 x 100% blower 1 bara 2 bara 1250 Am3/ 7.5m x 5m x 4.5m 2014
    Knarr, Petrojarl Teekay ( BG Group) North Sea (Norway) FPSO LP compressor Oil injected screw compressor 6,4 bara 16 bara 3411 Am3/h 9m x 5m x 5.5m 2013
    Clov, Total Angola FPSO Hydrocarbon blanket and flare gas recovery 2 x 100% blower 1 bara 2 bara 6700 Am3/h 12m x 6.4m x 5.3m 2013
    Goliat , ENI North Sea (Norway) FPSO FGR and HC blanketing system: 2 x 100% Blower 1 bara 2,1 bara 2280 Am3/h 10m x 4.0m x 3.5m 2011
    STATOIL, Peregrino FPSO Brazil FPSO Fuel gas skid: 1 x 100% Blower 3 bara 5,5 bara 400 Am3/h 6.5m x 4.0m x 5.5m 2010
    SUNCOR, Terra Nova FPSO Canada FPSO Hydrocarbon blanket and flare gas recovery 2 x 100% Blower 1 bara 2,1 bara 2500 Am3/h 8.0 m x 4.0 m x 3.5 m 2012
    Nexus II, Nexus Floating Production Vietnam FPSO Hydrocarbon blanket and flare gas recovery Blower package 1 bara 2,1 bara 1240 Sm3/h 4.0 m x 5.7 m x 3.5 m 2008
    Vietnam FPSO LP Compressor skid: Oil injected screw compressor 1.5 bara 11.5 bara 6458 Sm3/h 7.0 m x 4.2 m x 4.0 m 2008
    Chestnut (Hummingbird), Sevan North Sea (UK) FPSO Hydrocarbon blanket gas Blower package 1 bara 2,5 bara 800 Sm3/h 7.6 m x 3.4 m x 3.1 m 2007
    Ormen Lange, Hydro Norway Onshore VOC recovery Oil injected screw compressor 1,05 bara 9 bara 7500 Sm3/h 24m x 10m x 7m 2006
    Mongstad, Statoil Norway Onshore Flare gas recovery 2 x 50% Liquid ring compressor 1,1 bara 6 bara 2,523 Sm3/h 9m x 21m x 5m 2002
    Norne, Statoil Norway FPSO Hydrocarbon blanket gas Oil injected screw compressor 1 bara 2.1 bara 2800 Sm3/h 3,5m x 5,2m x 5,8m 2002
    Høvringen, Esso Norway Onshore Recovery of gasoline vapour from loading trucks at Høvringen tank farm Oil injected screw compressor 0,01 barg 8 barg 1800 Nm3/h 2002
    Rolvsøy, Esso Norway Onshore Recovery of gasoline vapour from loading trucks at Rolvsøy tank farm Oil injected screw compressor 0,01 barg 8 barg 400 Nm3/h 2002
    Troll C, Norsk Hydro Norway Platform Flare gas recovery Oil injected screw compressor and Flare Closure Arrangement HP-flare gas recovered by cross over line.
    Design capacities: HP 1000 kg/h and LP 250 kg/h.
    1999
    Varg, Teekay Norway FPSO Flare gas recovery Oil injected screw compressor and Flare Closure Arrangement HP-flare gas recovered by cross over line.
    Design capacities: HP 2000 kg/h and LP 1000 kg/h.
    1997
    Heidrun, Statoil Norway FPSO Flare gas recovery Ejectors package and Flare Closure Arrangement HP-flare gas recovered by a cross over line, tied in downstream the flare header knock out drum and fed to the 1 stage compressor. LP-flare gas recovered by ejector skid. Design capacities: HP 800 kg/h and LP 1000 kg/h. 1996
    For the complete reference list contact gasinfo@wartsila.com
    Applications - examples
    Picture Description
    Norsk Hydro
    Norsk Hydro Troll C
    Flare gas recovery, Screw compressor
    Capacity: 250 kg/h
    Statoil Mongstad Statoil Mongstad
    Flare gas recovery, Liquid ring compressor
    Capacity: 2 x 2600 kg/h
    Norne Statoil
    Statoil Norne
    Hydrocarbon blanketing, VOC recovery, Screw
    compressor Capacity: 3445 kg/h
    Ormen Lange Ormen Lange, Hydro
    VOC recovery, Oil injected screw compressor
    Capacity: 7500 Sm3/h
    Eldfisk Greater Ekofisk Area, Eldfisk II, 2/7s New Wellhead
    Flare gas recovery, Ejector
    Capacity: - Flare flow = 200 Sm3/h
    - Motive gas = 11700 Sm3/h
    Presalt Presalt Petrobras
    Flare gas recovery, Liquid ring compressor
    Capacity: 1400 m3/h
    Clov Clov Total
    Hydrocarbon blanket and flare gas recovery
    Capacity: 6700 Am3/h
    Quad 204 Quad 204 BP
    Hydrocarbon blanket and flare gas recovery
    Capacity: 2 x 2450 Am3/h
    Key benefits
    Hydrocarbon Blanketing and Recovery solution has been evaluated as safe as conventional inert gas system.

    Some additional benefits with this solution are
    • Increase of oil and gas export through reduced oil evaporation
    • Reduced use of fuel for the production of inert gas (one Inert Gas Generator is always left for maintenance purpose and back-up)
    • Reduced corrosion problems
    • Reduced CO2 and NOx emissions
    • Reduced risks of overall system shutdown due to VOC emission falling onto the main deck during calm weather
    • Creates a safer and healthier working environment (reduced hydrocarbon percentage in process area)

    By combining Hydrocarbon Blanketing with Vapour Recovery, Flare Gas Recovery and Ignition System, a substantial reduction in emission can be achieved.

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