CST Covers Replaces Fiberglass with Aluminum Domes case study


Courtesy of CST Industries Inc

Twin 65’ diameter aluminum domes Ironwood, MI 2000

CST Covers recently completed construction of a second pair of wastewater tank covers at the Gogebic-Iron Wastewater Treatment Facility in Ironwood, Michigan. This most recent contract consisted of twin 65' diameter Aluminum Domes for the facility's primary clarifiers. Previously, CST Covers replaced tank covers following a disastrous collapse of two fiberglass domes at the plant. CST Covers is the world's largest Aluminum Dome builder. In January of 1996, two 95' diameter fiberglass domes collapsed under a heavy, unbalanced snow load.

Following the collapse, a structural engineering investigation concluded that the domes were likely to fail at approximately 25% of the average annual snowfall for the region. Located along Lake Superior, the Ironwood area sees an average snowfall of more than 13 feet. 'At the time we toured other wastewater treatment facilities that had dome covers and concluded we wanted domes to replace the collapsed fiberglass covers,' said Mark Bowman of the Gogebic-Iron Wastewater Authority. 'We researched dome manufacturers to begin the replacement process.'

Energenecs, CST Covers’ local representative, joined three other dome suppliers in the bid process. According to Don Voigt of Energenecs, 'Even though CST Covers’ proposal was not the lowest price, they were awarded the contract based on their impressive record of structural integrity and proven performance in extreme weather conditions.' A prime example of that integrity is CST Covers’ Dome at Antarctica's South Pole Science Center, which has been withstanding the harsh conditions of the Antarctic since 1972.

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