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Wrong Johnny Aarseth?

Johnny Aarseth

Project Engineer

Rolls-Royce plc

HQ Phone:  +44 20 7222 9020

Direct Phone: +47 *** ** ***direct phone

Email: j***@***.com

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I agree to the Terms of Service and Privacy Policy. I understand that I will receive a subscription to ZoomInfo Community Edition at no charge in exchange for downloading and installing the ZoomInfo Contact Contributor utility which, among other features, involves sharing my business contacts as well as headers and signature blocks from emails that I receive.

Rolls-Royce plc

65 Buckingham Gate

London, Greater London,SW1E 6AT

United Kingdom

Company Description

We offer a portfolio of training courses and programmes for all our products, and can offer tailored training if required. This flexibility enables our customers to plan their training when they need it. Training can be delivered in any of our five regional ...more

Web References(1 Total References)


www.maritimejournal.com

The most well-known advantage of fibre rope is its neutral buoyancy - as a result the deck gear doesn't need to take the weight of the lifting line as well as the load, Johnny Aarseth of Rolls-Royce told MJ, a characteristic especially relevant to deep water deployments.
"If you can lift 150 tonnes on deck, you can take that down however far you like, even to 5km," he explained. This means that given the right equipment, far smaller vessels could be potentially used to carry out deep sea installations: at 2,500m depths a 250 tonne fibre rope crane can do the same work as a 400 tonne steel wire crane and the lighter weight also puts less strain on stability. However, there's a potentially even bigger advantage: fibre means operators can stop "working blind" said Mr Aarseth. As wire can't be inspected internally without specialist equipment, the entire length of wire on a winch gets discarded when the schedule indicates its working life is over: "This is simply not cost effective," said Mr Aarseth. Further, the management criteria vary widely and are by no means failsafe: despite the precautions "the wire still breaks occasionally" he added. By contrast, "with fibre you can see every single strand right down to filament level", said Mr Aarseth. "The smaller the radii the more friction, so we have introduced quite large sheaves on this system, larger than you see for a steel wire winch," said Mr Aarseth. Further, Rolls-Royce has also introduced a water cooling element on each bend which has proved to be effective "even in places like Brazil where you have naturally high deck temperatures". Most importantly, the different sheaves in the winch system individually compensate for lengthening of the rope when loaded, controlling the spooling tension by using a cable traction control unit (CTCU), "So, no matter if you have empty hook or a maximum load, you will still see the tension on the storage reel varies little," said Aarseth. This doesn't just stop the slip-stick effect or the 'cutting in' of unevenly spooled rope, it also means "you can recover the winch with an empty hook, pick up the maximum load and deploy it straight away", he said. Fibre rope does require "a different approach", admitted Mr Aarseth and at present accepted standards are still lagging behind the reality.


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