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Trelleborg launches new hose system for FLNG

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LNG Industry,

Trelleborg has released a statement claiming that it has launched a dedicated seawater intake hose, which is engineered to meet the specific requirements of floating LNG (FLNG) vessels.

The Swiline hoses are fully certified to the API 17K standard (certifies up to 30 years’ maintenance-free service life with a safety factor of 10) and are capable of being used in lengths of up to 600 m or more. They are capable of using seawater from greater depths, which can be up to 20ºC colder than surface water, making it more effective for liquefaction. They are available in diameters from 24 in. to 40 in. ID to help cope with greater volumes of water (up to 50 000 m3/hr), whilst also minimising the pressure drop to avoid cavitation risk. The Swiline products are capable of being used with either bundled or standalone riser configurations.

The Project Manager for oil and marine hoses at Trelleborg, Jonathan Petit, said: “FLNGs offer the potential to effectively extract vast amounts of LNG for industrial and domestic use, but to do that – and ensure the LNG is transported as cost-efficiently as possible – effective cooling is crucial. This means using seawater which is as cold as possible. This, therefore, needs to be extracted from greater depths and pumped in higher volumes than is the case with FPSOs, for example. Our Swiline solution draws on proven proprietary Trelleborg technology to deliver a guaranteed solution in even the most demanding conditions, accredited to the international API 17K standard.”

The hoses feature an integrated bending stiffener with a continuous inner liner and rubber outer cover. This helps minimise risk of corrosion, whilst also providing optimal thermal insulation. In addition to this, the use of steel cables in a rubber matrix helps to minimise creep, and offers typical tensile strength as high as 1600 t for 40 in. ID hose.

The hoses can be installed from the FLNG deck vertically. They can be assembled beside the hull by divers with connection on the intake flange, or in the riser caisson. Homogenous bolt pre-loading for optimal performance is ensured by the hydraulic and simultaneous tightening of the flange.

Trelleborg is able to offer riser/hull interface design and supply, strainer design and supply and hypochlorite injection lines. Injection from these lines is capable of being carried out at either the inlet point or the riser top level, depending of the depth of the inlet.

The range has been specified and qualified for Shell’s US$12.6 billion Prelude FLNG project. The technology also has the potential for use on floating production storage and offloading (FPSO) vessels.

Edited from press release by David Rowlands

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