The Department of Labor and Industries says the cause of a crane collapse that killed four people in Seattle in April was companies not following the manufacturer’s procedures for dismantling the machinery.
L&I said workers who were taking apart the tower crane in South Lake Union prematurely removed nearly all of the pins and sleeves that helped hold sections of the crane together.
The manufacturer’s procedures say not to remove pins other than the ones for each individual section being dismantled, according to officials.
The nearly six-month investigation by the department said premature removal of the pins and sleeves put too much stress on the crane during windy conditions. The crane collapsed when it was hit by a 45 mph gust of wind.
When the pins are in place, tower cranes can withstand much stronger gusts.
The crane at the corner of Mercer Street and Fairview Avenue North collapsed on April 27.
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Previous crane collapse coverage from KIRO 7
- 4 dead, 4 injured in crane collapse onto several cars in South Lake Union
- Space Needle camera helps pinpoint time of crane collapse
- Seattle crane collapse: Details about the victims, survivors
- Investigation underway as officials try to determine what caused fatal crane collapse
- Do you have an investigative story tip? Send us an email at firstname.lastname@example.org
Two of the people killed were ironworkers and two others were in cars hit by the crane. Seattle fire said six cars were crushed.
L&I said it investigated five companies. Three of those companies, Morrow Equipment, GLY Construction and Northwest Tower Crane Services were cited and fined.
Morrow was cited for not following the crane manufacturer’s procedures, which directly contributed to the collapse. L&I said Morrow approved the removal of the pins. The company was fined $70,000.
GLY Construction was cited for three violations, including not having a qualified supervisor and other employees at the site at all times during the disassembly process. GLY failed to ensure that the manufacturer’s procedures were followed, and did not account for weather conditions, L&I said. GLY was fined $25,200.
Northwest Tower Crane Services was cited for three violations, including not following the manufacturer’s procedures, not ensuring workers understood their duties, and inadequate training of workers. They face $12,000 in fines.
Watch coverage of the collapse in the videos below.
Breaking KIRO 7 coverage of the collapse
Timelapse video from camera on top of the Space Needle
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