A correction/revision to ’San Fransisco-Oakland Bay Bridge Bolt Problems Questioned Years Ago’ published in CEG’s June 15 Western edition, #12.

Detailed Report Concludes Oakland Bay Bridge Anchor Rods Manufactured by Dyson Corporation Were Not Defective

Based on the detailed 55-page testing and analysis report of the failed anchor rods from shear keys S-1 and S-2 performed jointly by leading industry experts, anchor rods manufactured by Dyson Corporation were determined not to be defective. The results indicate that hydrogen embrittlement was the cause of the recent anchor rod failures.

Salim Brahimi, a consultant of American Bridge Fluor (ABF); Rosme Aguilar, branch chief of the California Department of Transportation (Caltrans); and Conrad Christensen, a consultant of Caltrans, conducted the report, which was commissioned by Dyson.

Through this report and mutual internal investigations, it was concluded that the Dyson Corporation met its requirements on fulfilling this order to the specifications requested. The experts found that Dyson had no involvement in the application of the products and that it was the specifications that were ultimately at fault.

“When this issue on the Oakland bay bridge was first raised, we worked very closely with the contractors and final customer to understand the problems they were having,” said Brian Rawson, president/CEO of the Dyson Corporation. “Our director of engineering and quality engineers were involved from the outset and assisted with the analysis and conclusions of the issues that were raised.”

“Throughout this process, other customers, our supply chain and the media were requesting information with regards to this issue. Our position was to support our customer and work together to conclude the analysis and report. The Dyson Corporation is an ethical company and our values and customer relationships will not be compromised,” said Rawson.

A detailed analysis and report from some of the leading industry experts was carried out and is now available at www.dysoncorp.com.

For more than 125 years, The Dyson Corporation has supplied domestic fasteners, forgings and machined parts to America’s transportation infrastructure of bridges, railroads and waterways, the fossil fuel industries of mining and power generation, shipbuilding and nuclear power, and the OEM supply chain.

Beginning in 1884, as a specialty forge shop in Cleveland, founder Joseph Dyson started to produce small forgings for various industries. Responding to customer demand, Dyson soon developed the capability to manufacture larger fasteners and forgings, as well as fork arms for the material handling industry.

Today, forgings made at the Painesville, Ohio plant range in size from 1/2 to 10,000 lbs. (5,536 kg). Equipment includes a combination of hammers, mechanical and hydraulic presses, upsetters, benders, and state-of-the-art hot part formers with in-line heat-treating. In addition, the company’s extensive CNC turning and milling operations, and the considerable thread rolling, drilling and tapping capability; have helped Dyson develop into a premier critical fastener manufacturer. Working in product diameters from 3/4 to 8 inch, Dyson is producing fasteners to various specifications, including ASME, MIL, ANSI, and DIN, and servicing critical component markets, such as military product and nuclear power.

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