A record-breaking offshore lift
After decades supplying oil and gas to northern Europe, the 24,200-tonne Brent Delta platform was lifted and carried to an industrial recycling centre more than 700 kilometres away.
It was the heaviest-ever offshore lift. Twelve huge propellers linked to satellite positioning and wave-watching systems kept the world’s biggest ship steady within half a metre of its targets – eight lifting points welded to one of Europe’s largest oil and gas platforms.
The Pioneering Spirit’s ability to stay so still at sea is a triumph for all those involved in designing, building and operating the largest vessel in the world.
But guiding the ship’s powerful lifting beams into the receptacles on the underside of the Brent platform demanded yet more ingenuity.
A sophisticated system of sensors and gyroscopes guided huge robotic lifting arms fitted to both bows into the platform’s steel sockets, even as the ship rose and fell a few metres with the waves.
The 382-metre-long vessel then swiftly raised the structure from the three concrete legs that had supported it for four decades.
With Brent Delta held high above the waves by 16 beams each weighing more than 1,600 tonnes, the ship transported it to north-east England.
After arriving near the coastal town of Hartlepool on April 30, Pioneering Spirit transferred Brent Delta onto a 200-metre-long barge for a short final voyage into a specially adapted decommissioning facility run by Able UK.
The Pioneering Spirit approaches the Brent Delta platform
The Pioneering Spirit slots Brent Delta between its bows
Powerful arms lift the 24,200-tonne platform
Brent Delta arrives in Teesside
The landmark operation was the culmination of years of preparation by Able, Shell, the hundreds of engineers involved in constructing and operating the Pioneering Spirit, and a man who has dedicated much of his life to designing and building it.
“This is my life’s dream,” Edward Heerema, founder and President of ship owner Allseas, said. “I’ve been working on this for 30 years.”
Despite being the boss of the company, Heerema remains a hands-on engineer. He oversaw the removal of the topside, his team’s biggest lift so far, from the bridge. And he was on board for the Pioneering Spirit’s maiden heavy lift – a 13,500-tonne platform off the coast of Norway in August 2016.
Watch: how Brent Delta was brought back to shore
Title: One Man's Lift
Duration: 1:33 minutes
Description:
Brent Delta platform lift and removal.
One Man's Lift Transcript
[Background music plays]
Gentle instrumental music with delicate keyboard tones and strings, building to an anthemic style before gentling once again.
[Video footage]
Bird’s eye footage of the Brent Delta platform, seen against a background of blue seas and skies.
[Robert Cullen]
I never got to see it from this angle before.
[Video footage]
Footage of Robert Cullen sitting at a window alongside others, using binoculars to view the Delta platform through the window.
[Text displays]
For four years, Robert Cullen lived and worked on the Shell Brent Delta platform.
[Video footage]
Point of view footage, as taken from behind Robert and a colleague, of the Delta platform in the ocean.
[Robert Cullen]
I didn’t think I would see it again, so delighted to be part of the operation here to go and pick it up.
[Video footage]
More footage of Robert seated at the window, handing the binoculars to a colleague seated alongside.
[Text displays]
Now it’s being decommissioned,
[Video footage]
Panning front view of the topside of the platform, Brent Delta signage visible.
[Text displays]
in spectacular style.
[Video footage]
Bird’s eye view of the platform in the ocean, panning across to the approaching vessel, Pioneering Spirit.
[Text displays]
The world’s largest construction vessel…
[Video footage]
Bird’s eye view of the Pioneering Spirit in the ocean.
[Text displays]
lifted the whole platform in one go.
[Video footage]
Fast motion footage by night of the twin hulled Pioneering Spirit moving into position around the platform
[Text displays]
16 hydraulic arms…
[Video footage]
Point-of-view imagery from under the topside, showing one of the vessel’s lift beams extending and positioning itself under the topside. Close-up of the hydraulic clamp mounted on the beam rising to connect with the underside of the topside.
[Text displays]
raised the 24,200 tonne platform…
[Video footage]
More footage of the vessel’s hydraulic lift system lifting the platform free of the platform’s legs.
[Text displays]
in just 10 seconds.
[Video footage]
Front view of the Pioneering Spirit straddling the platform legs while lifting the topside clear of the legs. Close-up in profile of Robert, dressed in safety gear, standing at a ship’s railing alongside other colleagues, all smiling and laughing as they watch the lift.
[Text displays]
It’s a world record lift.
[Video footage]
Bird’s eye view of the Pioneering Spirit in the ocean, carrying the platform topside, while the top of the platform legs are visible at frame-right.
[Robert Cullen]
Fantastic. Probably the best thing I’ve ever seen in my career. Absolutely amazing.
[Video footage]
Close-up of Robert, dressed in safety gear, standing at a ship’s railing as he speaks while looking into the camera. Bird’s eye view of the topside aboard the Pioneering Spirit seen against the background of dark blue ocean waters and pale blue skies.
[Robert Cullen]
Next for Delta is off to Hartlepool, and off to the recycling yard.
[Video footage]
Low angle footage of a section of the Delta topside seen against a background of blue skies.
[Robert Cullen]
The next step in the journey.
[Video footage]
Close-up of Robert in profile, standing at the ship’s railing, as before, as he speaks and turns to look into the camera.
[Text displays]
Over 97% of Brent Delta will now be recycled.
[Video footage]
Panning footage of the Delta topside being brought into a shipyard aboard the Iron Lady cargo barge with the help of tug boats, the shipyard visible in the background. Wide low angle view of the Delta topside aboard the Iron Lady in the shipyard, seen against a background of stormy skies.
[Audio]
Shell jingle.
[Graphic]
Shell Pecten centred on a white background with text displaying below.
[Text displays]
© Shell International Limited 2017
Gentle giant
Before the Brent Delta lift could begin, the ship filled its ballast tanks with water to ensure its two huge bows passed safely beneath the underside of the platform.
Then the captain carefully guided the bows until the platform stood safely in a lifting bay bigger than a football pitch.
Eight giant lifting beams on each bow then extended under the platform, which weighs as much as around 2,000 double-decker buses.
Camera and radar-guidance systems at the end of each beam then helped guide the coupling points onto the underside of Brent Delta, while computers worked to keep everything under tight control, despite the sea swell below.
“The ship’s system looks ahead at the sea motion so it can take into account wave height,” said Allseas site manager Daan Akerboom.
“We also use a military-precision type of GPS receiver. All that data goes into a computer that controls the propellers and makes sure that the ship stays stable within a footprint of half a metre.
“The beams then compensate for that half-a-metre movement. The ship can move up and down but the beams make sure that the centre of those sockets stay where you want them to be. The beams are standing still while the vessel is moving underneath it.”
The lift begins
Once the ship and topside were securely connected, some of the water ballast weighing the ship down was pumped out to transfer around 80% of the topside’s weight onto the vessel.
The Pioneering Spirit then performed another great feat of marine engineering. Using compressed-air pumps on each arm, it raised the 24,200-tonne platform safely away from the legs in 16 seconds.
“It’s always exciting when you do the quick lift,” said Captain Fred Regtop. “To see such a huge weight being lifted so swiftly is really magical.”
The Brent field began production in the 1970s. Delta is one of four large platforms at the field, three of which have ceased production over the last six years.
In total, around 470 oil and gas installations in the UK North Sea will need to be removed over the next few decades.
Heerema hopes the Pioneering Spirit will lift many of those platforms, but he is already dreaming up a vessel capable of taking on the world’s largest offshore installations.
“We have an idea for an even bigger ship for the very biggest platforms,” he says.
By Daniel Fineren
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