Archive for the ‘Excalibur’ Tag

Blade Runners   13 comments

Right, with the hub and blades removed and secure on the aft deck, we now need to remove the blades, this is a tense time for Tom the engineer, if these barges are out of position by 50cm the blades may not fit into there purpose built holders on the main deck, and we cannot move the barges now.

First the nose cone has to be removed and stored on deck.

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Once removed the guys get inside and undo all the bolts from the first blade to be disconnected and the two cranes are attached.

This again is a very tricky lift, both cranes and a banksman are in total communication with each other throughout the whole lift.

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The cranes weave the blade through and over the legs. This shot gives you a good view of the Deep Diver and a sense of scale of the operation.Wind Farm12-42-09

From a different angle under the watchful eye of Tom, seen on the top level.

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Here you can see the purpose built racks which hold the blades in place while work is carried out on the hub replacing the bearings. Also the nose cone and to the right the stand that holds the hub in place. To give you an idea of size, the barge is 32m wide and the blades are 50.5m long, so they stick out over the edge a bit.

Wind Farm13-05-14

Once all three blades are removed the hub is made ready for its lift.

Wind Farm17-14-15

 

 

And it’s lifted over my office, when I say office I mean the place I have my positioning equipment set up.

Wind Farm17-47-30

 

Secure on the main deck the guys get to work, these guys work so well together, every one know exactly what they are to do and just gets on with it, what i found amazing was the way they all adapt to the work place, for instance, one guys will be welding one minute, the next he will be working the mini crane to help someone else and later he will be sweeping up when that part of the job is complete, its clockwork at it best.

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Old bearing being removed.

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Wind Farm Again   10 comments

Ok, if you are reading this then I have to presume you are not bored of wind turbines yet, thats good because today is the start of the geeky stuff.

Yesterday I mentioned the height of the cranes and the fact that they can’t reach the turbine in their current position, so what do we do? It’s a jack-up barge so we jack-up, and this is how.

Below is a photo of one leg, the Excalibur has 8 and the Deep Diver has 4, this is on the Excalibur, you see the rusty bit of tube in the middle? Thats the leg, inside the two grey cylindrical bits connected by a 3m hydraulic tube are eight rubber bladders, these rubber bladders are filled with compressed air to expand them and the air released to deflate them, easy.

So to go up the eight bottom bladders expand holding us in place, the hydraulics tubes extend (like in the photo) and once at the correct height the top bladders are filled with air, once we know they are secure, the bottom bladders are released and the hydraulics close to raise the barge by closing the gap, thats 3300 tons of barge, thats about 25.3 blue whales.

In the photo below we are at the top of the leg, about 30m out of the water.

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This is what the two barges look like at working height, this was the first time I saw them like this, the rest of the time I was on board the Excalibur.

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All of the turbines have a height of 73.5 metres (241 ft) and height to top of blade of 124 metres (407 ft). The blade length is 50.5 metres (166 ft) and each turbine has three blades. Each turbine weights 290 tonnes.

Have a great weekend.

Posted July 12, 2013 by rigmover in My Work

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Wind Farm 2   14 comments

I’m back in the land of the internet, no silly limits anymore, I actually got back last week but the wife and I headed off to Bruges for a few days R&R.

So this wind farm business! Why? How? I’ll try and explain.

First of all there are two barges, The Excalibur and the Deep Diver, these have to be positioned in such a way, with about 50cm tolerance so we can use both cranes at the same time, this is very important which will become clear in later posts.

We can only move these barges at slack water (In between tides) as the current is very fast because the water is so shallow, a couple of meters in some places. First we move the Excalibur and about 6 hours later the Deep Diver, we use two boats, the Valiant and the Sergeant Pepper.

Here’s the Valiant.

Valiant

 

And the Sgt Pepper.

Screen Shot 2013-07-11 at 11.12.04

 

Photo by Sydney Sinclair

We use the Valiant to tow us close to the location with help from Sgt. Pepper, then the Valiant is released from the tow and with help from Sgt. Pepper we walk the barge onto it’s final location, this is done by placing one leg on the seabed and with the Sgt. Pepper pushing or pulling we swivel around that leg, we will then drop another leg and do the same again, a little bit of tweaking and we are there.

Here is the Deep Diver on location at one turbine, the Excalibur has already been moved off to the next turbine.

Deep Diver

 

Coming alongside the Excalibur for my lift off by Billy Pugh, you can get an idea of the scale of the job at hand.

Excalibur

 

Now some of you may have noticed the cranes don’t seem big enough to reach above the turbine to remove it, more on that tomorrow.

Posted July 11, 2013 by rigmover in My Work

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