CoselleTM System Overview

Sea NG’s Coselle™ System is a combination of a loading and a discharge facility and the optimum number of appropriately sized, purpose-built, ships utilizing the the Coselle™ technology. Each Coselle™ System is specifically designed and sized to meet specific project requirements.

Individual components of the Coselle™ System include:

  1. Loading facilities where gas is treated, compressed and transferred onto ships.
    • Onshore loading is accomplished via a pier or jetty.
    • Offshore loading is accomplished via a platform or FPSO with loading via a buoy.
  2. A purpose-built fleet of Sea NG ships.
    • Quantity and size will vary with project parameters, particularly gas volume, distance and marine environment.
  3. Unloading facilities where gas is decompressed and discharged.
    • Onshore unloading of high pressure or low pressure gas can be carried out at a pier or jetty.
    • Offshore unloading of high pressure or low pressure gas can be carried out at a platform or buoy.
  4. Storage facilities, if necessary.
    • Can be offshore on a barge fitted with Coselles™.

With the Coselle™ System the ships provide the immediate gas storage and off-take for the customer. Each ship remains at the terminal while gas is loaded into or discharged from the Coselles™ at the rate required by the customer. The size of the fleet is optimized to meet specific project circumstances.

Shipping cycles are designed to ensure no interruption in loading or delivery of gas. If desired, additional reliability can be achieved by adding CNG storage at either end or by increasing ship size or fleet size to increase “slack” time. Loading and discharge rates are matched to meet customer requirements. Where desirable loading or discharge may occur discontinuously at higher rates and can result in overall lower project costs.

Key Features

  • Continuous delivery can be achieved without the need for storage at either the loading or discharge site because the ships provide both storage and transportation.
  • Loading and discharge rates can be varied or interrupted because compression equipment does not require continuous uniform throughput.
  • A wide range of gas compositions can be accommodated.
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