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Tag Archive: professional engineer

Children Will Fall At Playgrounds. What Shall We Do To Protect Them? A Multipart Blog Series – Part I
October 11, 2017 7:24 am Leave a Comment
A 5-year old boy was severely injured at a public playground when he fell through a second floor opening around a fireman’s pole in a playhouse. He fell more than seven feet and struck a bare concrete floor. We are thankful that he eventually recovered from his injuries. The person who designed and built the playground was accused of negligence. A lawsuit ensued, and eventually settled in favor of the boy. (more…)
Ready, Set, Fly! – Understanding Another Technology for Forensic Investigations
July 28, 2017 9:11 am Leave a Comment
This is the first blog in a series on integrating new technologies into the process of forensic investigations. Documenting the scene of an incident accurately, efficiently, and safely is a key step in every investigation. Busy roadways and unstable structures present hazards to the investigator during the investigation process. The use of remote sensors can reduce these risks and provide data that otherwise could not safely be obtained. (more…)
Should I Trust My Nail Gun?
July 11, 2017 9:21 am Leave a Comment
Can you imagine framing a house with the tools of our forefathers, using hand saws and hammers, rather than power saws and pneumatic nail guns? Power tools have made the job much easier and faster, that even the amateur is well equipped for this kind of work. (more…)
Graphitic Corrosion – Difficult to determine before a failure!
June 30, 2017 9:51 am Leave a Comment
Graphitic corrosion is a process that may happen in equipment made of iron, particularly grey cast iron, but also ductile cast iron. Graphitic corrosion can lead to unexpected catastrophic failure of the affected part because the cast iron can lose its strength without a visible warning such as a change in size, shape, or appearance. (more…)
Grounding versus Bonding – Understanding the Difference in Building Electrical Systems
May 30, 2017 1:52 pm Leave a Comment
While a teenager might be very familiar with being “grounded”, there is confusion over the meaning of the word in the electrical sense. In building electrical systems, “grounding” and “bonding” are two terms that are often misunderstood. Improper application of the concepts of grounding and bonding may create lethal shock and fire hazards. “Earthing” is a term which comes from the European International Electrotechnical Committee (IEC). Earthing is synonymous with grounding but often thought to have a different meaning. (more…)
Improper Design Leads to Fatigue Failure In Blower Shaft
April 27, 2017 2:51 pm Leave a Comment
A blower used to exhaust air from an industrial process stopped functioning when the blower wheel drive shaft fractured. The process, and thereby most of the plant, had to operate at a reduced volume until the blower wheel could be replaced. The blower wheel had been installed during a shutdown a week before the incident. The blower wheel was a spare installed when the existing blower wheel was sent for scheduled remanufacturing. (more…)
Injury Involving a Capstan Winch
February 22, 2017 9:43 am Leave a Comment
A capstan winch uses a mechanically powered rotating cylinder, called a capstan, to apply pulling force through a rope. When the rope is looped around the rotating capstan and tightened, friction between the rope and capstan allows the winch to apply force to pull a load. A typical capstan winch is shown in Figure 1 below. (more…)
Defective Clevis Pin Culprit in Runaway Trailer
October 24, 2016 9:06 am Leave a Comment
A large agricultural trailer had been connected to a truck using a clevis pin with a spring locking clip. The trailer became disconnected from the truck and collided with an oncoming vehicle. The trailer was in poor condition, did not have safety chains, and had substantial recent modifications by the owner. (more…)
Are You Prepared for Emergencies? Your Generator Set Should Be!
October 13, 2016 10:13 am Leave a Comment
Emergency generators are often called into service during catastrophic events like hurricanes, floods, tornadoes or fires, but also during more mundane events like thunderstorms and other things that may temporarily interrupt the public power grid. Can you rely on your generator to perform at those critical times? (more…)
Case Study of an Injury Involving a Soil Mixer
October 6, 2016 9:47 am Leave a Comment
In May, 2014, a plant farm worker was seriously injured when he fell into the hopper of an electrically powered soil mixer. The mixer in question used a rotating steel ribbon powered by a 7-1/2 hp electric motor to mix batches of materials such as sand, mulch, wood shavings, fertilizers and other landscaping materials to create potting soil. At the top of the hopper sidewalls, within 6 inches of the ribbon, was a steel grate. (more…)

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