Forensic Engineers and Consultants

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Why investigators should have “Scaled Diagrams” of scenes?

When it comes to diagramming a crash scene, there are several methods to complete the task. Forensic Mapping, (locating, positioning, and documenting the evidence of a collision scene to scale) is essential to having the answers to the questions “Who, What, Where, When, and Why”. Photographs do a great job showing what the investigators saw post collision; yet they lack scale and the ability to describe pre-collision movement. Having a computer aided diagram (CAD) of the collision scene goes much further than the pictures can; here is why.

basic intersectionA scale diagram gives the full overview of a collision scene from either a 2D or 3D point of view. Being able to see how things lined up, how they came together and how they parted helps explain the events within a crash. When a scene can be viewed from top down or any angle, that helps relay the facts. The investigator, judge, or jury will get Read More

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Al_Duncan_WEB
Hot Tub Hazards

Danger Lurking in the Hot Tub

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Several dangers involving the use of a hot tub (spa) may readily come to mind, such as the risk of shock or electrocution, or the risk of drowning for unsupervised young children.  Not so readily apparent is the effect of overheating the human body, or “hyperthermia”.

Some individuals are more susceptible to the effects of hyperthermia, including the elderly, young children, and those in poor health.  The effects of hyperthermia, or overheating of the human body, cause direct responses such as headache, nausea, heat exhaustion, increased cardiac output, lethargy, confusion, heat stroke and unconsciousness.  The onset of hyperthermia is defined as being at 99.5° F; if the body temperature reaches 104° F, a life-threatening medical emergency exists.  Read More

box bailer

Defective Vertical Baler Causes Serious Crush Injury to Operator’s Arm

I recently worked on an interesting case involving a box baler. An employee of a butcher shop put some empty cardboard boxes in a vertical box baler and pushed the control switch to compact the boxes. After the 30 by 60 inch platen weighing 851 pounds returned to its raised position, the employee reached into the open space above the bottom door on the baler and began to clear cardboard from the bale tie slots in the bottom of the raised platen. Suddenly, and without warning, the steel pin attaching the platen to the raised hydraulic cylinder rod failed. The heavy steel platen fell and crushed his arm which was outstretched over the baler door into the compaction space.

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Under the sink chemicals

Not Your Father’s House Fire

Remember the good old days when our homes were built with only lumber, dry-wall, and roofing?   Me neither.  However, we talk about ‘modern’ construction materials like this is a new phenomenon.  The truth is ‘modern’ construction materials started sneaking into homes over fifty years ago.  It’s not only construction materials that have changed: a century ago, we furnished our houses with wood, cloth, metal, and glass. Today, it’s plastics, foams, and coatings.

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Right Turns Only main photo

Right Turn Only

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In my 25 years of investigating collisions and traffic related incidents, one thing I have noticed repeatedly is that right turns are considerably better than lefts. I know it is obvious and sometimes seems a little petty; however, when it comes to the safety of your family, it is a big deal. Since I am currently in the process of teaching my second child how to drive, I am harping on vehicle safety a lot and this is one of the many practices I teach. I have instilled in my children (and my wife has picked up on it as well) that they should always plan out their route and, in doing so, make right turns instead of lefts whenever possible. The “Right Turn Only” practice will make your travels safer.

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An example of a process flow diagram

OSHA’s Process Safety Management – Is This Process Covered?

In February of 1992, the OSHA Process Safety Management (PSM) standard was issued. The official title is: ‘Process Safety Management of Highly Hazardous Chemicals.’ As its title implies, not every facility is covered by this rigorous standard. A process must contain highly hazardous, as defined by OSHA, chemicals above a certain weight threshold, again defined by OSHA. Notice that this is a process by process determination, so there could be certain processes at a manufacturing facility that are not covered by this standard situated beside other processes that are.
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accident

Are 10 Minutes Worth the Risk?

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Before retiring as a S.C. State Trooper, and to this day, people routinely ask me, “How fast can I go before I get a speeding ticket?” Let me start by saying one mile per hour over the speed limit can subject you to a speeding ticket. While different officers have different standards, it is easier to talk your way into a ticket than to talk your way out of one. So, much like the number of licks to get to the center of a Tootsie Roll Tootsie Pop, the world may never know an exact answer to how fast you can go over the posted limit without a citation. A better question is ‘What is the benefit of exceeding the posted limit?’ Read More

total_station_fi

Piecing it Together…Traced Evidence

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In the field of forensic investigations of traffic collisions, it can be repeated over and over that little things matter. It’s the details that align the facts to describe the event and answer the questions about the crash. Sometimes those details are simple, and they are often overlooked. The damage sustained by a vehicle involved in an accident tells a reconstructionist a lot. Your collision reconstruction could benefit from mapping the damage profiles of the involved vehicle(s) to assist in answering questions about the incident. Read More

A corroded boiler tube

Boiler Blowdown – It’s Not a Dance Move

When thinking about the safe operation of boilers (and don’t we all?), several systems can readily be named; flame control, fuel/air ratio; steam pressure control, levels in the vessel, etc. What about the water? It seems so passive, as long as there is enough for level control, what’s the big deal? Well, it turns out, that as the steam produced by a boiler is used in the process, the condensate from that steam is returned to the boiler as feedwater. However, since 100% of the condensate is not returned, whatever solids had been in that water before it evaporated to form steam are left in the remaining water.  Fresh feedwater is added to maintain levels, but even fresh water contains some dissolved solids. So over time, the water in the boiler system gets saturated with all sorts of dissolved minerals.
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Figure 1: A view of a playground with impact absorbing surfacing. The brightly colored surfacing beneath the play equipment is a poured-in-place rubber and polyurethane material.

Children Will Fall At Playgrounds. What Shall We Do To Protect Them? A Multipart Blog Series – Part III: An Overview of Selected Playground Safety Technologies

Co-Authored with Aron Olson, PE

Welcome to the third and final post in our multipart series of blog posts about a young boy’s fall and serious injury at a public playground. In our first post we gave a brief overview of the incident and our investigation. In the second post we discussed some of the safety standards applicable to public playgrounds. In this post, we will examine some of the impact-absorbing playground surfaces available to protect children at playgrounds from injury. If you would like to read the first two posts, they are available here and here.
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