20 EXPLORATION/DRILLING/FIELD SERVICES
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rates. By considering the total cost of ownership (TCO), a high performance steel wire rope pays off in a short periode, especially on offshore applications.
o Langs lay ropes for multi- layer spooling. For cranes using ropes in multi-layer spooling ropes in langs lay are recommended. These ropes normally will reach a higher lifetime than ropes with ordinary lay and are more flexible which gives a bether performance on the drum and a higher crush resistance.
As a summary, the
initial investment in a high- performance wire rope is higher of course, but the performance and the overall costs over the lifetime period of the rope gives a better return on that investment.
Specific applications
Depending on the application it is important to select the proper rope type. Non- rotating, high performance ropes – like the TK 16 Evolution from Teufelberger – are used as main and auxiliary hoist ropes in single or multi- layer spooling.
The fact that the rope
is non-rotating is of crucial importance especially in offshore crane applications, (as the rope is ‘rotation resistant itself’ due to the construction parameters of the rope).
Teufelberger ropes are designed for demands in the offshore industry and are very specific for an individual crane producer. Other special areas where high performance steel wire ropes are used are for example riser tensioner ropes. Especially on riser tensioner ropes long fatigue life time in relation to bendings is a merit for the customer. With the QS814VG (8 strand and high number of wires) these criteria will be fulfilled.
As a summary, there is Fig. 2. A crane on an offshore platform
Fig. 3. A deck crane operating on the Shell Goldeneye platform.
This helps to avoid uncontrolled movements of load which can be a risk for person and goods and – as a consequence – to the overall security of a platform. Best spooling properties for fast winch speeds are another benefit when using a high-performance wire rope.
For boom hoist applications (multi-layer spooling) an 8 strand, compacted rope, preferable langs lay for multi-layer spooling – eg, the QS 816 V (G) – will be recommended. High resistance against radial deformation and high flexibility will definitely increase lifetime and safety.
a broad range of different rope types and in any case it is very important to select the right rope type for a specific application. Industry experts – either from the rope manufacturer or from the rope supplier – are the right source of information before purchasing a rope. They can make an evaluation of the conditions under which a specific rope needs to operate on a specific crane. For international clients, as this is primarily the case in the offshore industry, the rope-availability on every major offshore hotspot on earth is also a very important factor. Teufelberger, for example, has a global distribution network with ropes in stock in every major part of the world. A team of service engineers with a broad experience in the offshore industry ensures a quick response and action in
case of troubles or if just help is needed. This is a very important backup function and a key criteria when selecting a rope supplier.
For example, the customer base of Teufelberger includes crane producers (eg, Liebherr or Seatrax), drilling companies (Transocean, Diamond Offshore) and production companies (Shell, BP, Petrobras) which have international activities in every part of the world. o
Gerald Neuwirth is with Teufelberger Seil GmbH, Wels Austria.
www.teufelberger.com
www.engineerlive.com
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