Boom collapse at Swedish windfarm

Boom collapse at Swedish windfarm

8. August 2017 

The boom of a 750 tonne truck crane collapsed yesterday while lifting the nacelle of a wind turbine in Sweden.

The crane a Liebherr LG1750 - which appears to be owned by Polish company Viatron – was working at the Solberg windfarm in Västerbotten to the south of Åsele in central Sweden.

It had just started to lift a large Vestas turbine when the boom went over the rear of the crane. Reports claim that the turbine was only a few metres off the ground when the incident happened.

We have no feedback on the wind speeds at the time. The only information we have was that there was a loud noise and the boom seemed to “recoil flicking over the rear of the crane”.

The crane was working with main boom, regular counterweight and a suspended counterweight at the time.

Boom collapse at Swedish windfarmThe scene yesterday afternoon

The crane operator was able to jump clear of the crane and suffered only minor injuries to his leg, which were apparently treated on site, two other men on the ground also suffered minor injuries and were treated on site. One of them was taken to hospital for a precautionary X-ray.

Boom collapse at Swedish windfarmThe operator managed to jump clear but the crane base remained stable

The incident occurred around 10:00 am yesterday. The windfarm will include 22 turbines and is expected to generate 250 GW - enough power for 50,000 homes.

It is funded by Skellefteå Kraft and Fortum. Vestas and Arise are responsible for project management services during construction.  SOURCE:

Boom collapse at Swedish windfarmThe turbine had only been lifted a short distance when the incident occured

Boom collapse at Swedish windfarm

Comment by the Heavy Lift Specialist:

What a terrible incident with the main boom of a Liebherr LG1750 being pulled over backwards. It is fortunate that only minor injuries were sustained by some of the Crew. I wish them a full recovery soon.

I trust and hope that Liebherr as well as Viatron will soon publish a detailed Incident Report explaining the root cause of this unfortunate incident so that we can all learn from what went wrong here.

The first question that comes to my mind is: At what wind speed did they start the lifting and in which direction was the wind blowing?

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15/09/17 @ 23:182

Picking object (the Vestas Nacelle) is opposite of the collapsed boom. My guess is cable snapped and the boom recoiled like a fly fishing rod. Probably a bad cable or miss routed that caused it to fail prematurely.




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