SHIP DESIGNS · mob/demob. However, do all of us have the same focus? A shipyard wants to deliver a vessel according to specifications, on time, on budget. A shipowner wants his vessel

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SHIP DESIGNS FOR THE FUTURE

27.05.2015 | Page 2

IVAR KNUTSEN

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THE FUTURE…

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What does the future ask for? Today? • Cost-reduction! • Cost-efficiency! Tomorrow? • Bigger • Deeper • Safer • More reliable • Cleaner • More fuel-efficient AND • Cost-efficiency!

Basically, what the future has asked for, and received, for the

last 15 years.




COST-EFFICIENCY

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Getting the maximum amount of work from a vessel with the lowest reasonable cost

Yes, of course, you might say. But is this

understood in the same way by all the parties? The oil companies, the

operators, the ship owners, the ship yards?

In our opinion, cost-

reductions can be achieved by improving the understanding of this simple statement across the value chain,

from ship yard to oil company.

So, although as an engineer I enjoy talking

about new and fancy stuff, I will spend some

time on cost effectiveness, before I move on to the more

exciting stuff.

In simple terms, this means:




COST-EFFICIENCY

27/05/2015 | Page 5


work?

Stay on DP?

All systems operational?

Transit from A to B?

In this context, work is defined as activities that add actual value for the end client by fulfilling the purpose the vessel was built for. For instance, moving structures or pipes from the quayside to their location on the seabed. Improving the efficiency, means improving the ratio of time when actual work is performed, thus reducing time spent on waiting on weather, transit, and mob/demob.




COST-EFFICIENCY

27/05/2015 | Page 6


work?

Stay on DP?



In this context, work is defined as activities that add actual value for the end client by fulfilling the purpose the vessel was built for. For instance, moving structures or pipes from the quayside to their location on the seabed.

work




COST-EFFICIENCY

27/05/2015 | Page 7


work?

Stay on DP?



Improving the efficiency, means improving the ratio of time when actual work is performed, thus reducing time spent on waiting on weather, transit, and mob/demob.

However, do all of us have the same focus? A shipyard wants to deliver a vessel according to specifications, on time, on budget. A shipowner wants his vessel to stay online as much as possible.

maximum amount of




COST-EFFICIENCY

27/05/2015 | Page 8


work?

Stay on DP?



Improving the efficiency, means improving the ratio of time when actual work is performed, thus reducing time spent on waiting on weather, transit, and mob/demob.

maximum amount of

Has this fundamental definition been obscured by «simplified» specs?

• 400 t AHC crane? • ERN 99.99.99.99? • 10 t/m2 deck capacity?

Has this fundamental definition been obscured by «simplified» specs? We believe that the efficiency of vessels can be improved by improving the understanding across the chain, from oil company to ship yard.




COST-EFFICIENCY

27.05.2015 | Page 9


How is the ability to lift these objects defined? • Lifting capacity, at depth • Outreach • Lifting height • AHC capability • Deck arrangement • Vessel motion characteristics

To give an example of this, look at a

construction vessel with a subsea crane? What does it lift? All kinds of things, like

templates, spool pieces, suction anchors

and a range of other structures.

What defines the

required crane capability?

Again, a range of parameters, where the weight capacity is just

one, and in many cases not the most important

one.




COST-EFFICIENCY

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A spool piece is a good example, as it is a

common structure. It is not very heavy, but requires extensive

lifting height.

My point is, rather than going for the maximum

size crane on your vessel, which, due to its

weight, can only be mounted on a low

pedestal, a cheaper crane with a lower

capacity, but increased pedestal height, can do many of the same lifts, and maybe even more

lifts, where lifting height is more critical.

• Lifted weight, 80 tons? • 250 t crane sufficient? • In several cases, not. • Pedestal height is more important.

250 t crane Pedestal height limited

150 t crane Better height, lower cost

Does the end client value this?

A better understanding of actual needs, rather than simplified specs, can lead to more efficient vessels at lower cost.




THE FUTURE…

27/05/2015 | Page 11

Tomorrow? • Bigger • Deeper • Safer • More reliable • Cleaner • More fuel-efficient AND • Cost-efficiency!

Going back to where we started, the

requirement for cost-efficiency will stay with

us. Still, we need to take the next step.

Focusing on solutions

that address the fundamental

challenges, we had the following posed to us:




VESSEL CONCEPT STUDY

27/05/2015 | Page 12

• Significantly improve energy efficiency of seismic vessels. Conventional designs typically 2x6 MW propulsion to achieve 5 knots towing capacity. Target here, 2x5 MW for same performance.

• Find a solution to the stability challenge conventional seismic vessels suffers from:

• Requirement for very wide streamer deck ↓

• Wide ship has unfavourable roll motions ↓

• Wide ship means shallow draft → small propeller diameter → low towing efficiency

Coming back to solutions that adress

the fundamental challenges, we had the following posed to us:





27/05/2015 | Page 13

• Deep centre hull – big propellers – high towing efficiency • Slender hull – low resistance • Wide vessel without impairing roll motions





27.05.2015 | Page 14

Work done • Power arrangement • Propulsion tests in towing

basin • CFD analyses

Improvements identified • Propulsion arrangement • Hull form





27/05/2015 | Page 15

Outcome • Challenge met – reduction from 2x6 MW to 2x5 MW achievable • Valuable experience in hull concept fundamentals • The trimaran hull provides an opportunity to optimize hull shape without

the drawbacks of a traditional hull. This means that a range of other applications are now considered, such as anchor handlers, PSVs and others.

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SHIP DESIGNS · mob/demob. However, do all of us have the same focus? A shipyard wants to deliver a vessel according to specifications, on time, on budget. A shipowner wants his vessel