The Low Motion FPSO (LM-FPSO) is an innovative floater design with focus on cutting overall field development cost while improving safety to enable establishing business case for offshore field developments. The LM-FPSO provides optimal storage capacity, enables hosting cheapest and most robust riser solutions and is relocatable to nearby fields.

The LM-FPSO design is based on field proven technology with extensive in-service life of all its components. It consists of a conventional topside and hull that maintain station-keeping using conventional mooring system. The LM-FPSO's performance is enhanced by introducing a free-hanging solid ballast tank (SBT) located certain distance below hull keel and connected to the hull through four groups of short tendons. All tendon components are the same as those used in conventional Tension Leg Platforms (TLPs). However, with the short tendon length, no tendon couplings or offshore installation derrick barge are required. Through the mass and added mass of the SBT, the new design offers significantly low motion in heave, roll and pitch.

In this paper, a parametric study is performed to optimize the key design parameters that govern the performance of a dry tree LM-FPSO which is located in 250m water depth. Results are obtained using fully coupled analysis in frequency and time domain to illustrate the sensitivity of the platform performance to each of these parameters.

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