MBCs protecting FPSO applications
Reducing risk for offshore FPSO applications
Marine Breakaway Couplings (MBCs) are vital for the safe offshore hose transfer of hydrocarbons between Floating Production Storage and Offloading (FPSOs) and conventional/shuttle tankers.
FPSO production and transfer processes provide a substantive risk to the offshore environment and the safety of personnel. The installation of MBCs greatly reduces this consequential risk and the size of the potential pollution spill. MBCs also help protect assets from damage and operations from extended downtime when incidents occur.
Shown above: Gall Thomson MBCs during FPSO transfer operations.
The proven reliability of Gall Thomson MBCs in FPSO applications
Manufactured according to the specific configuration of the FPSO offloading system and managed in accordance with Gall Thomson installation and operations guidelines, Gall Thomson MBCs have been proven to be reliable for FPSO permanently floating hose, hose reeled system (in air or submerged catenary systems) with all existing brands of OCIMF marine hoses (with or without nipples).
Gall Thomson MBCs are unmatched in performance when required to operate after tanker breakouts due to harsh weather or extreme pressure surges.
Shown above: Hose on reel with Gall Thomson MBC.
The Gall Thomson MBC is the unmatched solution for protecting FPSO operations
The Gall Thomson MBC is self-energised and is calibrated to respond to pre-defined loads. The MBC does not reply on human operation and is therefore unrivalled in response time when compared to any alternatives such as Bow Loading Connectors/North Sea Valves (BLS) where human operation and procedures are susceptible to rapidly evolving circumstances
OCIMF has classified MBCs as passive couplings whereas Bow Loading system/North Sea Valve are active couplings requiring human intervention with activation of ESD1 and ESD2. Whereas Bow Loading system/North Sea Valve can take up to two minutes before BLS is disconnected, the MBC is the last resort when all redundancy systems in place fail and when Mooring Masters do not have enough time to disconnect BLS (if applicable).
OCIMF has also identified that passive couplings such as Gall Thomson MBCs have a primary function; which is to activate in cases of tanker breakout or extreme pressure surges caused by sudden failure of BLS systems or failure and slamming shut of butterfly valve during full flow conditions.
Typical MBC configurations
Gall Thomson MBCs are proven in FPSO permanently floating hose or reeled hose configurations.
Example above showing Tanker Midship Manifold configuration
Example above showing Bow Loading configuration
Offloading Reel Considerations
Gall Thomson has supplied more than 30 MBCs on FPSO reeling application and this successful track record is due to the unique understanding of MBC applications for FPSO reeling systems. Involved early in the FPSO offloading system, Gall Thomson is able to calculate the loads applied on the MBC by the hoses chosen by the contractor depending on the hose parameters. Examples include: hose stiffness and hose nipple length if applicable, reel parameters and the operational parameters such as purging pressure and flushing procedures.
Based on FEA analysis and testing, Gall Thomson can manufacture MBCs with a high design parting load, transit bolts or remote transit protection.
Shown above: MBC single closure on FPSO in the North Sea.
Shown above: MBC with internal transit bolts on FPSO in the Gulf of Mexico.
Shown above: MBC with external transit bolts on FPSO in the Gulf of West Africa:
Shown above: MBC used without transit bolt on FPSO in Asia and South America