Forensic Engineers and Consultants

Archive: Industrial

Fire Pumps are Cool 😎; Lets Keep Them That Way

In my last blog, we discussed the small PRVs that go on wet sprinkler systems to limit their pressure below 175 psi. That brought to mind a small PRV in another application that is used to keep something different cool: an electric motor-driven centrifugal fire pump. I can’t talk about electric fire pumps without also talking about diesel fire pumps, so let’s dive in and take a look at both! Read More

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Steam Explosions…Spectacular Expansions, Spectacular Losses

I’ve heard some people say that the term steam explosion is a malaprop because explosions involve combustion.  However, if you look up the definition of explosion, you get this: “a large-scale, rapid, or spectacular expansion or bursting out or forth.” (Thanks, Meriam-Webster!!)  If you’ve ever witnessed a steam explosion, you’ll agree that it is a MOST appropriate term!

Steam explosions occur when water or other liquid undergoes a sudden phase change Read More

Surprise Slip and Slides  

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Falls were the number one cause of preventable non-fatal injuries and the number two cause of preventable deaths in the US in 2019 (CDC and NEISS data). Slip and falls occur when there is an unexpected loss of traction between a person’s foot and the walking surface.  Slip and falls are common and can occur in any setting where people walk, including homes, workplaces, and public areas. Slip and falls can result in serious injuries, particularly for older adults.

The human gait cycle consists of four phases: Read More

Know a Fire Sprinkler, Like a Boss – Part 2

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In Part 1, we looked at the basic parts of a fire sprinkler and took a closer look at other parts including heat responsive elements, wrench bosses, and kick springs. In this part, we’ll look at k-factors and deflectors.

K-Factor and Orifice Size

K-factor is a characteristic that relates water pressure to flow rate from the sprinkler, represented as k in the equation Q = k√P, where Q is flow (gpm) and P is pressure (psi).

If we supply water at 50 psi to a k-factor 5.6 sprinkler, the flow rate is 40 gpm. If we supply 50 psi water to a K25 sprinkler, the flow rate is 177 gpm. There are now sprinklers as large as K33.6, which would flow 238 gpm given 50 psi – big difference from the K5.6!

The most common k-factors are 5.6, 8.0, 11.2, 14, 16.8, 22.4 and 25.  There are smaller and larger k-factors than these.  For reference, K5.6 and possibly K8.0 are most often found in Read More

Slippery Painted Exterior Walking Surfaces

As an experienced safety consultant, I’m called on to investigate a wide range of premises liability incidents. One common premises liability incident that often results in serious injury is a fall on an improperly painted or maintained walking surface.

Slip and fall accidents are a common occurrence and can lead to serious injuries and even death. Painted surfaces are one of the most Read More

Know a Fire Sprinkler, Like a Boss – Part 1

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In this blog we’ll take a look at the basic and some of the less-known parts of fire sprinklers, with more to come in a later post.

Here are the basic parts of the fire sprinkler, shown on a pendent glass bulb sprinkler and an upright solder element (“fusible link”) sprinkler:

 

Let’s take a closer look to learn about some of the less known parts, and also look at two types of sprinklers disassembled. Included in parentheses are some of the different names for some of these parts. Read More

Scared of Water, or Prefer to Get Drenched? Fire Suppression with Preaction and Deluge Systems

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In my two previous blogs, we first discussed wet sprinkler systems (Wet), the most basic and most common fire system type followed by dry sprinkler systems (Dry), which are a bit more complicated.  Ratcheting up another level, in this last edition on sprinkler systems, let’s take a look together at preaction and deluge systems.  These can be complex and variable, so we’ll operate at the 30,000 ft level. Read More

When a DRY Fire Sprinkler System Leaves You Soaked

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In my previous blog , I discussed the most basic and most common fire system type: wet sprinkler systems. The possible failure areas discussed with wet systems will also apply to dry sprinkler systems (control valves closed, obstructions, issues in the system, installation, or deficiencies with inspection, testing, and maintenance). Dry systems are even more prone to obstructions than wet systems, so close attention should be paid to that possibility. Read More

HEY…Cover Up Please!

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Machine guards can be compared to the clothes we wear every day.  Indeed, they serve a very important purpose.  Imagine someone leaving their home on a fine, sunny morning wearing nothing but a smile.  Wonder how far they will get through the day before things start going poorly for this individual?

 

 

 

 

 

There will be more than a few raised eyebrows and blushes when he stops into the local Starbucks for his usual morning double-dipped and whipped, chocolaty chip with a touch of pumpkin spice cappuccino fix.  Good luck with that!  Probably going to leave disappointed, empty-handed, and likely wearing handcuffs.  This will be the beginning of a very long, very bad day for that individual.  Had he recognized the risks associated with this type of behavior, and then put forth a little effort to cover up, he would have prevented many unfavorable and possibly life-changing personal and legal problems from ever occurring!

And so it is with properly guarding a machine.  Machine safeguarding helps to protect workers from preventable injuries. Read More

WARREN Welcomes Mechanical Engineer Bob Hickman, P.E.

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Please join us in welcoming Mechanical Engineer Bob Hickman, P.E., to the WARREN family! Bob has over 30 years of manufacturing and machine design experience in production and quality-driven environments. Bob holds a Bachelor of Science in Mechanical Engineering from Clemson University.

Bob’s Areas of Expertise Include:
-Machine Safeguarding
-Machine Design
-Equipment Failure
-Mechanical Engineering
-Industrial Accident Investigation
-Codes & Standards
-Machinery & Equipment Damage Assessment
-Products Liability Read More

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