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The marine breakaway coupling is a vital component in offshore crude oil and refined product transfer systems. The MBC operates within a floating or subsea hose string and will activate and shut down flow when an event occurs. This activation is instigated by undue overload during tanker loading or discharging (for example, tanker breakout), or an extreme pressure surge.

If marine breakaway couplings are not fitted then the resulting oil spill and trauma to the transfer system may cause damage to hoses and equipment, injury to personnel, extended downtime, costly oil spill clean-up and environmental pollution.

Gall Thomson invented the petal valve MBC, conceived the flip-flap valve MBC and continues to be the world leader in the design and manufacture of safety marine breakaway coupling technology.

This proven technology means the Gall Thomson Petal Valve MBC and the Gall Thomson Flip-Flap Valve MBC are the industry standards for marine breakaway couplings. These breakaway couplings offer an unmatched record for reliability and durability and significantly reduce the risk of spillage during transfer; which is a frequent cause of offshore oil spills.



Gall Thomson MBCs provide a controlled parting point and spill shutoff facility to the exact requirements of the transfer system. The units are self-motivated and self-contained and require no outside power source.

The Gall Thomson petal valve marine breakaway coupling has been specifically developed for heavy fuel oil and crude oil safe transfer. This MBC offers zero headloss and protects hoses and assets from damage that might be caused by undue overload during tanker loading and discharging or extreme pressure surge.

This marine breakaway coupling offers low-maintenance, ease of fitting, pigging and is compact and lightweight. The unit is self-energised which means the MBC is not vulnerable to the reliability of external power sources.

The option of instantaneous or controlled closure means the MBC can be calibrated to suit particular system requirements.

The Gall Thomson Flip-flap valve marine breakaway coupling is suitable for low-viscosity products or short-term crude oil terminal operations, fuel and liquid gas (LPG) transfer systems and temporary loading/offloading operations.

The unit is compact and lightweight and offers flow efficiency and safety within offshore oil transfer systems. These include minimum headloss, 100% leak-free shut-off, low maintenance and ease of fitting.

This unit is self-energised which means the marine breakaway coupling is not vulnerable to the reliability of external power sources.

The option of instantaneous or controlled closure means that the unit can be calibrated to suit particular system requirements.

The Welin camlock coupling offers an efficient connect and disconnect of hose flanges and is considerably easier, quicker and much safer than the more traditional draft pin, nuts and bolt alternatives.

Each cam on the unit takes only five seconds to connect and is impossible to loosen once deployed in a pressurised line.

Gall Thomson offers a comprehensive range of fitment types and extras such as blind flanges and lifting lugs. Camlock couplings are also available in different materials and special paint finishes.

The Gall Thomson Welin Camlock Coupling is used throughout the world in marine loading / discharging terminals, ports, refineries, dock facilities, chemical plants and distribution centres. Applications include cryogenic, submersible and hydraulic operations.

Gall Thomson offers a comprehensive after-sales service that is designed to maintain safe and efficient transfer systems. These services include return-to-factory MBC refurbishment, on-site MBC refurbishment, resetting, preventative maintenance, spares kits, advice and training.

Signum Technology company KLAW LNG, the world leader in the design and manufacture of Ship-to-Ship and Ship-to-Shore safety critical LNG transfer systems, has confirmed an innovative new element to its hose transfer system.

Petal17, the latest Marine Breakaway Coupling (MBC) launched by global market leader Gall Thomson, has set new standards for lightness, precision and performance, to the extent that the company describes it as the most advanced protection against offshore oil spills in the world.

Signum Technology company KLAW LNG, the world leader in the design and manufacture of Ship-to-Ship and Ship-to-Shore safety critical LNG transfer systems, has confirmed an innovative new element to its hose transfer system.

Signum Technology Group company KLAW LNG, the world-leading specialist in the design and engineering of ship-to-ship and ship-to-shore LNG transfer systems, has transformed the lives of the people of Montego Bay, Jamaica, by delivering the world’s first fully automated LNG safety transfer system to enable a reliable flow of LNG to this community.

Gall Thomson, the world’s leading authority on the application, design and supply of Marine Breakaway Couplings (MBCs) has published a consultative guide to assist operators in managing MBCs within their transfer operations.

UK-based liquid transfer technology provider Gall Thomson has reached a major milestone by supplying its 2,000th marine breakaway coupling (MBC) system.

Leading marine coupling solutions provider Gall Thomson, is pleased to announce the launch of a new line of next-generation locking cams for its Camlock Coupling systems.

Leading Marine Breakaway Couplings (MBCs) provider Gall Thomson is pleased to announce it has introduced a neutral buoyancy float for use with MBC systems.

Marine Breakaway Coupling (MBC) technology provider Gall Thomson is pleased to announce it has launched an enhanced version of its Petal Valve MBC, which has been optimised for use in the offshore hydrocarbon transfer market.

Gall Thomson has launched a range of Underbuoy Breakaway Couplings (UBCs) designed to protect Single Point Mooring (SPM) terminals from the potential consequences of vessel collision or extreme weather events.

Heller five-axis CNC machining equipment has entered operation at the Gall Thomson technology centre in Great Yarmouth, UK.

Gall Thomson has opened a state-of-the-art technology centre in the UK that will be used for the design, production, refurbishment and testing of marine breakaway couplings.

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Gall Thomson approved certification (GTAC) is a detailed standard for the servicing of Gall Thomson marine breakaway couplings (MBCs) that will enable operators to hold a recognised standard of service history for each unit.

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