A 250-ton crane with fiber rope can do the same job that currently need a 400-ton crane.
As the fiber rope is neutral in water, can 250-ton crane with 2,500 meter long fiber rope in principle lifting and used down to 2500 meters depth without losing capacity. Rolls-Royce has basically designed crane for 4,500 meters fiber tow.
A crane with steel cables must pay attention to the wire weight, which can halve the actual lift capability for operations at great depths.
Industrial designers from Inventas has helped to get Rolls-Royce engineers to think outside the box.
It has given a slimmer, lighter and simpler construction.
Max 400 tonnes
According Rolls- Royce they can deliver cranes with capacities up to 400 tons. The crane can be either electric or hydraulic operation of winches.
Cost and operational should fibertaukrana be competitive in today’s marketplace.
Several current customers in Norway and abroad are according Rolls-Royce ready to order as soon as the opening of the market.
the crane will be first presented at ONS in Stavanger. It is just over a year after the National Oilwell Varco (NOV) presented his fibertaukran during Nor-Shipping.
Water cooling
Rolls-Royce has chosen a little another method than NOV. There NOV has chosen to fast rope vertically inside the crane housing tower and foundation, Rolls-Royce has placed winch and reeling under cover.
Not to destroy the rope strength and capacity, it is important that the rope not overheat and be kept at a stable temperature.
While NOV controls the temperature in the race, has Rolls-Royce water cooling the rope at each turning point.
Brazil testing
Product responsible for the crane, Johnny Aarseth, says that Rolls-Royce has developed an electronic control system for fibertauhåndtering, based on 10 years long fibertauerfaring, including from ODIM, which was acquired in 2010.
– We began experimenting with fiber rope in 2003 and delivered its first winch fiber rope for Subsea7 in 2006. We have developed a model for the control of the core temperature of fiber rope, says Aarseth to TU.
Crane operations with fiber rope is conducted in full scale onboard Skandi Santos in Brazil since 2010. There used a module handling tower.
– It’s a Christmas tree installation factory for Petrobras. Fibertaukrana works perfectly, says Aarseth.
Outside the box
For the new offshore crane, which should have active heave compensated (AHC), the Rolls- Royce used industrial designers.
– the goal was to bring down the weight. Industrial designers asked questions and made us think outside the box. It has given great weight savings, including by building hexagonal arms and not square with internal stiffeners, says Aarseth.
He said the new control system monitors the operation and rope condition, and tells you when it’s time for inspection and repair.
– it may conclude that part of health monitoring for the entire ship, called Equipment health Monitoring from Rolls-Royce, says Aarseth.
Health surveillance for ship sends valuable data to the ship’s operator and owner of the land.
Easier crane and rope – less ship
with slimmer and lighter designs on knekkarmkrana (knuckle boom) and reduced weight with fiber rope, the offshore service companies and oil companies to manage with smaller ships.
– When a smaller crane do the same job, could potentially also a smaller ship used for crane operations offshore. A smaller and lighter crane is also an advantage for the ship’s stability when the crane is in operation, and may result in lower fuel consumption, says Aarseth.
The design must also prevent ice formation in arctic conditions. A new wheelhouse provides a good overview, low noise. It is heated and may be equipped with a toilet, if desired, according to Rolls-Royce.
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