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This thread is most interesting to me. (not being a pilot myself, I am occasionally one of your passengers on the (mostly Dutch) North Sea.
The improved capsule to which Diginiagain is referring is the Frog. It has shock breakers under de seats. I found it very comfortable but as a passenger you have less self-control in case of emergency (immersion or tipping over) as you are strapped in. Offshore Personnel & Cargo Transfer Solutions | Reflex Marine | Reflex Marine The Billy Pugh is still on board almost every drilling rig and occasionally used in the North Sea. The oil companies keep it as a last resort. Helicopter is the preferred and prescribed way of transfer (and perceived the safest) The risks with Billy Pugh transfer are in the possibility of snagging of the guide lines; the high impact at rough seas and last but not least: crane operator induced oscillation. Operating a Offshore Crane - The Wrong Way Oscillation is best dampened by dipping the Billy Pugh in the sea but that does not make the passengers more happy. I only have been transferred to a boat by Billy Pugh after 3 days of mist. But after 3 days of mist the sea is dead calm so very little risk on high impact. The DP Gezina which is being used by Perenco does not uses the Billy Pugh or Frog but has an “Ampelmann”. http://www.ampelmann.nl/products/s2s/ This is a gangway which is mounted on a wave motion compensating hydraulic suspension. This is a Dutch development which originates from the idea to mirror the hydraulic suspension of flight simulators! As already mentioned by EESDL this works up to about 2,5 Hs significant wave height. (with 2 m hydraulic cylinders, it should be able to expand the envelope but would need larger cylinders) Ampelmann suggests/mentions on their website that this would give 87% up time in the Southern (Dutch) North Sea. I question that. Fact is that it is nothing new. As far as I know in 2006 the Smit Kamara was the first supply vessel on the North Sea equipped with a wave motion compensated gangway operating for NAM/Shell. The gangway requires a docking station/step-over platform on the fixed platform or windmill, which can be up to 20 m above sea (but usually lower). At this moment the REM Star and the REM Mermaid have such gangways and are operating from Den Helder. These vessel are specifically NOT intended for crew transfer to larger Manned platforms far away but are used as smaller mobile maintenance stations to serve NUI’s which have no proper accommodation. This eliminates that maintenance crews loose much hours by heli transfer every morning and evening. In Southern North Sea NAM/Shell have 3 satellites which are so small that they do not even have a heli deck! These are designed to be visited for maintenance solely by these “Walk to Work” vessels and they plan to do so only every two years! It is true that a lot of the maintenance people do not love this way of “Walk to Work” as when they are working they are on a stable platform, but when they go to bed they are subjected to the wave motions of the vessel. Sea-sickness is indeed very common! I think it will only be a few years before dedicated SWATH type (fast semi-submersibles) are fitted with an Ampelmann and will reduce those complaints. These SWATHS are already been introduced in Windfarm maintenance and Pilot vessels. http://www.loodswezen.nl/nl/materieel/swath/1823/ http://www.odfjellwind.com/ So yes it is a thread for some helicopter operations. But also something good may have come out of it: Another Dutch company Barge Master has copied the idea and first developed it into a motion compensated crane foundation. Lately they have teamed up with aluminium helideck producer Bayards to introduce a motion compensated helideck on board ships. http://www.barge-master.com/products/motion-compensated-helideck.html I was not able to find any data on significant wave heights or maximum amplitudes which can be absorbed, but I think you would need pretty long cylinders to compensate the full motion of a ship in conditions where this is beyond the ability of helicopters to land. Can anybody give some answers on the maxima which can be handled by an helicopter without any compensation? I guess it will aim to reduce maximum amplitudes too, say, 50% to increase operational limits. SLB |
Boat Jumping
SLB
Don't know if it's coincidence or not, but whilst watching your YouTube clip, the Ad that came up was offering something about a 'RETIREMENT GUIDE'!!! But back to thread - Many moons ago as a young BRITISH Contractor on contract offshore Dubai to an 'Okie' outfit - you know the one, that World Leader in Safety that developed the STOP program (amongst others), they did in-field transfers by boat, usually laying alongside a lower landing deck - this quite often required use of a monkey rope, however if it was a bit choppy they switched to crane & basket During my Festive Run ashore to play Santa Claus, I ended up with a broken wrist - however that safety conscious company still demanded my presence offshore, it was that or a ticket home!!! Somehow I survived!!! This was the same company whose Field Foreman (GOD) completed an accident report involving a colleague who in typical Brit (mind you he was a Taff) fashion responded " Not as far as I know" to the question about his offspring - Six weeks later back came a Telex from Ponca City querying the response!!!:ugh: PZU - Out of Africa (Retired) |
This is the boat/system that Perenco are trailing:
DP Gezina/Galyna - YouTube It doesn't involve a crane. http://www.cfbv.com/walk-to-work-vessels/ |
So, if a rig with say 100+ people on it requires a crew change every two weeks, as is often the case in many parts of the world, and over 15+ rigs/vessels/fpso's/tankers nearby all requiring the same, then is one boat going to accomplish this? Nope. It's going to need a fleet. Then what happens when the sea state goes above 3m? AND, the distance between the furthest rigs is 100miles+? Can a boat do this in a day? Nope.
Some bases flying offshore can do up to 19 flights a day, transferring hundreds of personnel A DAY. I wouldnt worry about losing your offshore flying to a boat anytime soon. |
SEACOR are offering fast cats with connections to heave compensated gangways capable of transporting up to 80 people at a time in "business class" comfort.
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New ship is expected to help cut southern North Sea costs
A new maintenance support ship for Shell’s southern North Sea gas operations made its first appearance in UK waters at the weekend. Shell said the vessel, named Kroonborg, would change the way the company and partner Nederlandse Aardolie Maatschappij (NAM) operated more than 50 gas producing platforms. It is expected to reduce the cost of operating smaller gas fields, which are becoming increasingly prevalent, by improving the productivity and safety of maintenance engineers. The Kroonberg, owned by Dutch company Royal Wagenborg, can carry up to 60 workers who would previously have travelled by helicopter and stayed on platforms for two weeks at a time. Shell said it combined the capabilities of a supply boat – carrying food and equipment – and standby vessel, which provides support in an emergency). It will also transport workers directly to gas platforms, potentially reducing by 25% the number of helicopter flights required. The new vessel will support up to three platforms at a time and allow staff to move between platforms when jobs are complete, which – along with a fully-equipped workshop on board – is expected to increase the number of productive man-hours offshore by 20%. Shell and NAM project leader Haije Stigter said: “It’s crucial, particularly in a low oil price environment, to keep an eye on the cost of operating smaller gas fields in the southern North Sea. “The Kroonborg will make a big difference by allowing us to use manpower and equipment more efficiently.” The new ship was shown off to Shell and NAM staff at an open day in Great Yarmouth on Saturday. It will start work in the Dutch and UK southern North Sea within weeks. http://cdn2.shipspotting.com/photos/.../8/2184872.jpg |
So it's a workboat. Carrys men and equipment and ties up alongside an unmanned platform to carry out maintenance, workovers etc...
in good weather. |
I can see many offshore workers preferring this though. They can technically become seafarers, tax free, and enjoy the pitching and heaving associated with this size of vessel in the north sea. :ok::ok::ok:
I hope its a great success:E |
How did this trial go, was it a success ??
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Originally Posted by Impress to inflate
(Post 9821055)
How did this trial go, was it a success ??
The Smit Kamara could be regarded the trial. This ship is purpuous build. Aim was 20% efficiency increase, after one year they reached 30%.NAM viert eerste verjaardag van onderhoudsschip Kroonborg | NAM In Dutch of course Cheers SLB |
To echo SLB. My company did some of the risk assessment work for the Smit Kamara. At that time it looked better than rotary.
Years roll by, ship transfer by either crane or gangway is literally hundreds and thousands (orders or magnitude to those in the know) safer than helicopters. They will not take over, the time and resistance of the workforce to sea going and the rest will always make it a second choice - but one which is so much cheaper it will eat into the helicopter market. In the southern sector it will restrict the helicopter market, less so up north but eventually expensive and dangerous helicopters will seem an extravagance. |
dangerous helicopters? hmmmm
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Years roll by, ship transfer by either crane or gangway is literally hundreds and thousands (orders or magnitude to those in the know) safer than helicopters |
Early days in the Ninian we lived on a Semi-Submersible and walked to work....then flew the shuttle flights to the platforms and back to the platform the helicopter lived on....then we walked back home to where we lived.
Watching the walkway shuttle back and forth to judge where the stepping on/off point was could get interesting. |
I remember doing the crew change for the Beryl Safety boat by winch. Mobil/Maersk had done a risk assessment and had decided to do the crew change by helicopter (Public Transport restrictions, of course) rather than by basket
Talking to the Maersk crew they preferred the helicopter winch transfer too TC |
Here is the boat that will be trialled.
Not that good overall but will get there in the end. :E Go NZ! :ok::E https://regmedia.co.uk/2017/04/25/la...g?x=1200&y=794 |
Total going same way
Total is going the same way as NAM/Shell in the Dutch Northsea. They have chartered from Bibby:
Offshore Energy Today Mobile SLB |
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