An often overlooked item in your home’s infrastructure is the water heater. Most people don’t think a lot about their water heater until they turn the tap and are surprised with water that is less than hot. Water heaters are just like many other major home appliances, they need a little attention to get their maximum life and performance. Read More
As the holiday season nears, thoughts turn to wonderful home-cooked meals with family. Few things in life are more pleasurable than a traditional holiday turkey feast. Yet for an unfortunate few, holiday meal time can turn tragic if a turkey frying accident occurs. While fried turkeys may be tasty, many fire safety experts feel that the reward is not worth the risk. Read More
In the 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
Ah, summertime. Summer’s heat brings some good things: opportunities for outdoor swimming and seasonal produce: blueberries, and peaches, and watermelon…
Summer’s heat doesn’t bring all good things. It can even trigger issues with fire sprinkler systems. Let’s zoom in on a small component on a wet fire sprinkler system that’s there in part because of summer heating: a pressure relief valve.
A pressure relief valve (or an auxiliary air reservoir) is required on wet sprinkler systems; one reason is to Read More
An afternoon summer rain shower led to an elderly woman’s admittance to the hospital. Mrs. Jones, aged 68, entered a retail store to buy groceries for her visiting family. Mrs. Jones walked through the store’s vestibule toward the entrance where she slipped and fell, sustaining significant injuries. An investigation was conducted to determine the cause of the slip and fall incident.
The investigation revealed Read More
Statistics predict that about half grill owners will be firing them up this upcoming Memorial Day weekend [i]. Let’s look over a propane grill, as if we had just pulled it out for the grilling season, for some tips and red flags. Not beef tips or how to get the perfect sear on your steak – safety tips! Besides hot surfaces, a gas grill serves up hazards related to flammable gases: fires, explosions, and flash fires. Read More
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
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
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
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
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