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Tag Archive: professional engineer

Container Handler Fire
October 27, 2014 10:37 am Leave a Comment
Container handlers are mobile, rubber-tired, machines that are used to load and stack standard containers at a variety of shipping terminals. The machines resemble oversized forklifts but are equipped with shipping container lift spreaders instead of forks. The machines are often equipped with sophisticated computer systems that inform the operator which container needs to be lifted as well as its destination, whether it is a truck, train, or storage stack. (more…)
Injury on Power Buggy
August 11, 2014 10:17 am Leave a Comment
When an operator is thrown from a ride-on vehicle when it tips over, such as a mud buggy, serious injury or death can result. In one such case we investigated, the issue centered on the maintenance of the vehicle, specifically whether a maladjusted hydrostatic drive caused the braking mechanism to malfunction. (more…)
Wind Turbine Rotor Overspeed at Wind Energy Park
August 4, 2014 10:21 am Leave a Comment
A wind turbine was being erected as part of a small wind energy park. The wind turbine tower and the nacelle housing the generator were successfully installed. The three-bladed rotor assembly was installed and connected to the nacelle as the last major component of the wind turbine. (more…)
Crawler Crane Calamity at Cement Plant
June 16, 2014 10:11 am Leave a Comment
A production building was being constructed at a cement plant. A large crawler crane was being used to install the pre-assembled metal wall framing of the building. The weights and lift radii of the four wall framing sections, along with the rigging spreader and other lift equipment, were within the rated capacity of the crane. (more…)
Bolted Connection Failures
April 28, 2014 9:47 am Leave a Comment
One of the most common features of machinery, consumer products, and assemblies of any type is the bolted joint. Sometimes the joint fails, with results ranging from inconsequential to catastrophic. The design of a joint is in the purview of an engineer, who must consider the material to be joined, the geometry of the joint, the loads imposed on the joint, the strength of the connectors (i.e., bolts, screws) environmental effects (i.e., temperatures, corrosion) and perhaps other factors. (more…)
Forklift Falls off Loading Dock
April 8, 2014 8:44 am Leave a Comment
A forklift fell off the loading dock of a warehouse as it was in the process of entering a semi-trailer that was being loaded. The forklift fell because the semi-trailer and the connected truck rolled away from the edge of the loading dock as the forklift passed over the dock leveler into the trailer. The repeated braking forces of the forklift as it carried loads onto the trailer caused the trailer to move away from the loading dock. The semi-trailer wheels were not chocked to prevent movement away from the loading dock. (more…)
Crane Pile Driving: Who Owns This Loss?
March 24, 2014 10:25 am Leave a Comment
The boom of a hydraulic crane was bent while removing temporary sheet piles at a construction site. A vibratory hammer had been placed at the top of the sheet piles to both drive and remove the piles. The vibratory pile driving placed no significant loads on the crane boom, as that operation relied on the weight of the sheet piles and the vibration of the hammer to sink the piles into the soil. The vibration of the hammer and the lifting force of the crane boom were needed to remove the sheet piles from the soil. (more…)
How Long Before The Pipes Freeze?
March 18, 2014 9:47 am Leave a Comment
The unusually severe 2014 winter in the eastern United States has reminded many people and businesses that when water in a pipe freezes, the ice will expand and burst the pipe or pipe fitting. Large losses will result from flooding when the temperatures rise. Insulation will help, but not prevent freezing. Insulation simply slows down the rate of heat loss. The time of exposure to subfreezing temperature is an important factor. (more…)
Freeze Damage to Fire Sprinkler Systems
January 10, 2014 10:57 am Leave a Comment
The ongoing frigid temperatures serve as a reminder of the many investigations by Warren engineers involving fire sprinkler systems that have failed when some part of the system was exposed to the sub-freezing conditions. Interestingly, failures do not necessarily occur within the area of greatest freeze exposure, as the failure mechanism is the extreme pressure that results from the growth of an ice plug inside the exposed pipe in which the high pressure will rupture the weakest component which may even be located in a heated area of the sprinkler system. (more…)
Mobile Crane Ground Support
January 6, 2014 8:45 am Leave a Comment
Mobile cranes depend on stability through their outriggers. These are the four “legs” that are deployed onto soil or other working surfaces adjacent to the crane. When a mobile crane is set up at a site, the outriggers are deployed by a hydraulic mechanism that extends the four outriggers beyond the crane body and then jack the crane free of its wheels so that it is supported by the outriggers only. (more…)

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