What is STS transfer?
STS transfers are a vital part of the supply chain; this type of transfer typically occurs in situations when a vessel carrying liquid cargo is unable to enter a port or moor alongside a jetty due to draught restrictions (for example, VLCC or ULCC-sized vessels), or when a vessel carrying oil in bulk needs to unload at different ports along its voyage. Other reasons for transfer might be lightening a vessel prior to entering a harbor, bunkering operations, or perhaps changing custody of a cargo while at sea. Ship-to-ship transfer is an essential part of efficient and cost-effective transport of oil all over the world.
What hose standard is required for STS transfer?
This application usually requires the use of dock hoses according to EN1765 standard.
So, why is Trelleborg recommending the use of a different standard?
The KLELINE STS standard is qualified to GMPHOM 2009 standard – the highest standard for oil transfer, the requirements of which go beyond the EN 1765 standard in terms of durability and service life.
What’s the benefit of switching to GMPHOM 2009 for STS?
It’s essential that, as the industry evolves, we continually evaluate the long-term effectiveness of oil transfer solutions. Oil transfer is a complex process and each part of the value chain should be examined. When it comes to hoses, investment in a higher specification can reduce the need for maintenance, increase operability, and lessen the number of costly replacements over the lifecycle of a project.
Another advantage of this standard is that it allows better prediction of performance, service life and resistance, as is standard in the offshore sector. This has not previously been standard for STS applications – and brings a new level of certainty, trust and accountability to this process.
How does it work?
The KLELINE STS consists of two carcasses made of steel cables, based on technology originally devloped for truck tires. The DUAL carcass design means that, while the first carcass provides resistance to internal pressure (up to five times the working rated pressure (RP)), the second carcass provides resistance to the stresses and loads inherent in STS, and protects the first from the external environment, while preventing leaks. This enables the hose to withstand accidental kinks or crushing forces that can occur due to the forces involved.
The hose also demonstrates the value of Trelleborg’s unique nippleless design. In contrast to a standard nipple hose design, there is no stiff metal connector in between different sections of the hose. The hose is more flexible and the continuous inner liner and integrated gasket create a perfect sealing solution. The design means that there is no need for gaskets at each connection – increasing the simplicity of installation, and reducing the potential for errors in installation.
The nippleless hose design and KLELINE build on a long legacy of success – this proven technology, while constantly updated, has been in use since 1975 on hundreds of offshore projects around the world – and is now poised to bring the same level of safety and reliability to the STS segment.
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