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Ammonia Refrigeration & PSM Contractor Qualification, Training Edition
Most companies will go to some degree of lengths in selecting “qualified” contractors to include things such as job examples, a list of qualifications, require subscription to the ISN network, etc. Even then, though, sometimes bad apples slip through the cracks if the company needing a “qualified” contractor doesn’t develop a scope or set of expectations for said contractor. But what about who performs...
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Overfilling LPG Cylinders
Recently, I shared the investigation results of the fatal LPG explosion in Hillsboro, OH. The cylinder had been overfilled, leading to its catastrophic failure, which then led to LPG gas finding an ignition source in the car repair garage and exploding. I took some flak for stating that I have seen overfilling of LPG cylinders often. Many believe it to be a rarity. Today I was performing an audit...
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HAZCOM Classification and Labeling Table
This may be helpful to some. Use in your training or written program. … HomeRead More »
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Example of "Highly Toxic" and the fatal event (OSHA)
The term “Highly Toxic” has been codified in the IFC as: A material which produces a lethal dose or lethal concentration which falls within any of the following categories: 1. A chemical that has a median lethal dose (LD50) of 50 milligrams or less per kilogram of body weight when administered orally to albino rats weighing between 200 and 300 grams each. 2. A chemical that has a median...
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Safety Thought of the Week... be as inquisitive as a 5-year old
I used this humorous video to open my casual analysis training. Every parent has been there, but our kids’ curiosity is great. It’s how they LEARN. Sure, they may not understand all they are hearing (the same goes for adults in accident investigations), but that curiosity is what we need when leading a causal analysis activity. As facilitators, we will NOT know all the answers, but...
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Initial Explosion at Iranian Port (4/26/25)
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Leak Test Gone Bad
At 11:05 a.m. on August 5, 2022, an employee, 59, was pressure testing a pressure vessel for leaks with compressed air when the air pressure became too high within the vessel. The lid of the vessel flew open and struck the employee in the arm, abdomen, chest, and head. The employee was taken to the hospital and died due to his injuries on September 27, 2022. … HomeRead More »
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Pressure Test Gone Bad (air-cooled heat exchanger)
At 4:00 p.m. on April 14, 2023, an employee, 23, working for a structural sheet metal manufacturer, was performing hydrostatic testing on an air-conditioned heat exchanger. A plug failed under pressure, striking the employee. The employee was killed after being impaled in the chest by the plug. … HomeRead More »
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Fatal Hydrogen Tube-Trailer Accident
In 1981, workers at LANL were about to fill hydrogen (H2) cylinders from a large, H2-filled tube trailer. They used a manifold containing residual oxygen (O2), which was also connected to a tube trailer of O2 with only one valve separating these incompatible gases. When the mix ignited, the workers attempted to purge O2 from the manifold using low-pressure H2. The resultant fire destroyed the valve,...
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Zero equals Zero, not 0.27 psig
A 25,000-gallon tank used to store nitrogen or carbon dioxide at 250 psig needed maintenance that required the removal of a four-foot diameter, 500 lb manhole cover. The tank was evacuated to 0 psig using the manually operated relief valve. Once the workers no longer heard air flowing through the valve, they released the stick they had been using to keep it open. … HomeRead More »...
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Understanding common pressure units
There are numerous units used to measure pressure… … HomeRead More »
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A contractor boilermaker loses consciousness (N2 with air-line helmet respirator)
A contractor boilermakerlost consciousness following the inhalation of nitrogen supplied through an air-line helmet respirator. On 26 April 2024, a contractor boilermaker (CMW), was setting up for a hot work task and attached their air-line welding helmet respirator to the nitrogen line (refer Figure 1). The CMW then put on their air-line welding helmet and fell to the ground. Other CMWs in...
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