Apr 8, 2015
Bremen, 8 April 2015
Big, bigger, biggest: It has been a case of “all hands on deck” at Gleistein over the past several weeks as some of the strongest slings ever to leave the Gleistein Ropes production floor in Bremen were professionally crafted by a large team of our rope making specialists. A total of twelve slings each made of 128mm diameter 12-braid DynaOne® ropes have been manufactured for deployment on one of the world’s largest cranes. Each sling will boast a breaking load of 4,500 tons (SWL: 900 t) and will be combined to a single lifting gear setup to deliver some of the most extreme lifting performance ever provided by textile slings. Due to their low weight, the completed slings will enable the crane to transport payloads that are around 57 tons greater than if steel-based slings were used. This incredible feat is made possible through Gleistein’s ongoing commitment to rope making R&D and personnel development, it’s long history of cutting-edge solutions for industrial applications and continual investments in state-of-the-art production equipment.
The strongest slings to ever leave the Gleistein Ropes production floor
While Gleistein is no stranger to manufacturing some of the world’s strongest and most advanced rope solutions, there has been a special buzz in the air at the Gleistein headquarters in Bremen over the past few weeks. A large team of specialists led by Head Rope Maker Wolfram Müller has been working around the clock to manufacture and expertly finish 12 slings for which no superlative is an exaggeration. Made with Dyneema®, the 12 slings have been made from 1,200 metres of 128mm diameter DynaOne®. Precision work was required to professionally splice and finish each of the 12 slings to ensure each individual sling delivers the extreme 900 ton safe working load performance (corresponding to an approx. 4,500 ton breaking load with a 5x safety factor). Gleistein’s rope laboratory with 300 ton tensile testing machine was used to help stretch and milk any residual slack from the splices and ensure a safe and cleanly whipped finish.
The individual slings weigh in at between 560kg and 1,030kg. The twelve slings combined in the final lifting gear setup will therefore have a total weight of approx. 8.5 tons – around 57 tons less than if a conventional steel solution was deployed. As such, the Gleistein slings will help make one of the world’s largest cranes even more formidable as its maximum payload is effectively increased by these 57 tons. Wolfram Müller, Head Rope Maker at Gleistein Ropes, reflects on the mammoth task: “This assignment has been an exciting challenge for us. The required specifications were extraordinary and meant that several innovative manufacturing methods need to be combined to deliver the performance and reliability needed to complete this task. Together with my team of rope makers and other specialists, we are extremely proud of our accomplishments – something that would not have been possible without the unique combination of experience and qualified personnel as well as our new, large state-of-the-art braiding machine, which allows such large diameter solutions to be produced in the first place.”
For those who want it big
Standing six metres tall at the Bremen production site and weighing in just short of 20 tons, the braiding machine used in the manufacture of these record-breaking slings is truly gargantuan. Each of its 12 carriers holds 900mm high 560mm diameter bobbins each with a volume of 220 litres allowing a total of 1,600kg of Dyneema® fibre to be loaded simultaneously. Once the carriers were equipped and set up with the corresponding strands, the 128mm diameter DynaOne® rope used for the production of the slings could be output at around 100m per hour.
The slings will go into use shortly on one of the world’s largest cranes. Completely made with Dyneema® fibres, the slings not only weigh a total of around 57 tons less than their steel counterparts, they are also easier and safer to handle.
Gleistein has been manufacturing ropes since 1824 and is the oldest family industrial company in Bremen (Germany). Together with its Trencin (Slovakia) plant the company boasts two of the most modern rope manufacturing facilities in the world with a total production area of more than 17,000m². Modern chemical fibres, sophisticated designs and future-oriented rope finishing equipment and procedures offer a definite quality “plus” that directly benefits the consumer. Gleistein offers a complete service, provides its customers with industry-leading know-how and assists in selecting the perfect rope – whatever the need. Ready-to-use finishing of products, execution of contracted tests and the development of tailor-made solutions round out the comprehensive range of services.
Geo. Gleistein & Sohn GmbH
28777 Bremen, Germany
Tel: +49 (0)421 69049-31
Fax: +49 (0)421 69049-99
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10999 Berlin, Germany
Tel: +49 (0)30 36 44 11 04
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