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Tag Archive: safety design analysis

Working on the Waves While Working the Waves…
August 3, 2020 9:27 am Leave a Comment
The rumors of my pending retirement have been greatly exaggerated…..

Ever since I heard about The Great Loop I have wanted to cruise it (www.greatloop.org). To successfully complete the Loop, one needs to have 3 things: adequate equipment, adequate time, and adequate health. I had the first and third. To secure the second, I had floated the idea of a two-year sabbatical. A year to complete any existing cases and a year to execute The Great Loop.

With the arrival of COVID-19, our firm went to remote work. (more…)
The CE Mark and What Should It Mean to You? Part Two
July 20, 2020 2:58 pm Leave a Comment
In the previous blog (Part One) we discussed the backstory behind the two stylized letters CE and what it means to the design of machinery bearing the mark. We outlined some of the requirements of the “Machinery Directive” (MD) which include what are known as “Essential Health and Safety Requirements.” The Essential Health and Safety Requirements incorporate an iterative risk reduction process during design that takes into account (more…)
Failure to Maintain Tow Hook Latch Results in Bystander Death
March 27, 2020 12:02 pm Leave a Comment
An unfortunate and tragic case that we investigated involved a commercial “rollback” recovery truck that was being used to transport a four-wheel drive diesel pickup. The diesel pickup was not in running order with its’ engine in the bed of the truck. Consequently, a commercial towing company was hired by the truck owner to transport the truck. In the process of loading the truck onto the rollback, the truck came uncoupled from the winch and cable system. The truck then rolled down the inclined bed of the rollback, running over and killing a bystander. (more…)
Manufacturer Settles with Operator Injured by a Flying Tool Fragment from Milling Machine
September 29, 2015 1:23 am Leave a Comment
In my June 2015 blog, I discussed a personal injury case where the jury decided that the lack of interlocks on the covers of a swamp cooler did not render it defective, even though it was technologically feasible to do so and their existence would have prevented the amputation. Conversely, in another interesting personal injury case involving a computer numerically controlled (CNC) milling machine, a large settlement was made by the manufacturer with the injured operator because the machine did not have adequate interlocks on its enclosure doors. (more…)
Jury Claims Swamp Cooler is Not Defective; Interlocked Guards are Not Required
June 15, 2015 9:24 am Leave a Comment
An evaporative cooler, also known as a “swamp cooler”, is an air conditioner that works by evaporating water. A float valve keeps several inches of water in the bottom of the unit. A pump takes water from the pan to the top of a series of vertical pads made of absorbent materials like wood fibers. The water flows by gravity through the fiber pads. A fan pulls hot air from outside the house through the soaked pads. Water in the pads evaporates, cooling the air and increasing its humidity. The cooled and humidified air is blown back into the house. Evaporative coolers need to be cleaned periodically. (more…)
Desk Reviews Answer Subrogation Questions
February 24, 2015 9:51 am Leave a Comment
An important question concerning a workers’ compensation claim involving machinery and equipment is whether or not the loss can be subrogated to a responsible third party. In order to properly analyze this question, it is often helpful to have an engineer determine if the machine contains a condition of defect that caused the incident. One effective way to move ahead with confidence — and without investing travel time and money into a full investigation — is a Warren desk review. (more…)
Harmless Appearing, Smooth Rotating Mixer Shaft Causes Serious Finger Amputation Injuries
September 11, 2014 10:43 am Leave a Comment
I recently finished working on a case where an operator received a right hand injury when an unguarded, rotating mixer shaft caught his gloved hand between the right index finger and middle finger, twisting it around the shaft causing the index finger to separate from the hand and the middle and ring finger to be dislocated. The mixer contained an unguarded rotating shaft, which created an uncontrolled motion hazard when rotating at speeds up to 450 RPM. (more…)
Uncontrolled Hazards and Risk Assessments — Part Two
March 10, 2014 10:20 am Leave a Comment
In Part One, I shared a case of a machinist blinded while using a computer numerically controlled (CNC) machining center. The equipment, which was safeguarded, contained a known hazard, but the machine manufacturer included an interlock guard to help protect the operator during the machine’s intended use. (more…)
Uncontrolled Hazards and Risk Assessments — Part One
March 3, 2014 8:27 am Leave a Comment
Machine equipment manufacturers are called upon to study potential risks of equipment before selling it in the marketplace. In addition, ANSI machine tool standards further address equipment hazards and risks that cannot be eliminated by design. In one case I investigated, the depth of that critical risk assessment became an important factor in a claim involving a machinist blinded while using a computer numerically controlled (CNC) machining center. (more…)
Preventing Fugitive Vapor Explosion with Design
December 16, 2013 8:01 am Leave a Comment
For years, many water heater-related fires, injuries, property damage claims, and deaths were attributed to “consumer misbehavior.” By 2002, however, the NFPA National Fuel Gas Code began to reflect several key realizations: the existence of fugitive vapors and how appliance design can limit the risks they pose. (more…)

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