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Do I need a "weep hole" at my PSV discharge if I have a "rain cap" on the end of my vent lines/discharge piping?
Yes, we still need to consider drainage at the low point of our discharge piping, even with a “rain cap”. While a rain cap is designed to deflect direct vertical precipitation from entering the discharge lines/piping, it is not a hermetic seal. Over time, moisture can still enter the discharge piping through condensation, wind-driven rain, or melting frost/snow. Looks look at ASME Section...
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An explosion in the dryer system injured three workers
During a maintenance shutdown at a wood pellet plant, three workers employed by a mill machinery service company were working at the mill to clean the burner. The workers were standing at the opening of a burner door when an explosion occurred in the dryer system. The three workers were knocked backward by the force of the explosion and suffered burn injuries. … HomeRead More »
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Workers were injured in an explosion and fire when an electrostatic discharge ignited flammable vapors
At a wellsite, two workers operating a vacuum truck were vacuuming and cleaning fluids, sludge, and sediment from a low-pressure separator vessel (LPS). Other workers opened two hatches on the LPS and inserted their vacuum hose into a debris-catch opening. Suddenly, an explosion occurred inside the LPS, resulting in a flash fire. One of the two workers was thrown against an adjoining vessel by the...
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The worker died after an explosion and fire during a truck-to-truck fuel transfer (Static Electricity)
A worker was standing on top of a tanker truck to transfer gasoline from a tanker trailer to the tanker truck. The tanker truck’s engine was running, and the pumping system was engaged. The worker opened access hole covers to a compartment in the truck that held diesel and to another that was empty. Some diesel remained in the hose (mounted on a reel in a cabinet on the side of the truck) because the...
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Line Break Gone Bad - Worker seriously injured while replacing a leaky gasket in a steam plant
In a steam plant at a plywood mill, two (2) workers were attempting to replace a leaky nipple and gasket at the end of a condensate header. As they were loosening or removing nuts from the outer flange at the end of the header, one worker was sprayed with steam and condensate (hot water). The worker sustained serious injuries. … HomeRead More »
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Two workers were splashed with an ammonia mixture (leak from an air purger)
At a poultry-processing plant, a worker (engineer) was responding to an ammonia leak from an air purger (equipment that removes air and other non-condensable gases from the refrigeration system to improve efficiency). He described the signs of the problem to a refrigeration mechanic over the telephone. While waiting for the mechanic to arrive, the worker was splashed with ammonia-saturated water (ammonia...
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Line Break Gone Bad (Worker misidentified flange that needed unbolting)
A worker on a contracted maintenance crew at an oil refinery partially unbolted a flange on a live crude oil heat exchanger. An undetermined volume of oil was released. Another worker, a refinery employee who participated in the incident response, was exposed to the resulting crude oil vapors, which are believed to have contained hydrogen sulfide (H2S). The second worker sustained injuries from the...
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Acetylene inside the work van ignites
An auto repair worker was walking toward his mobile service vehicle, which contained an oxyacetylene welding system, to start work for the day. When he was approximately 32 ft. away, he clicked a button on the key fob to unlock the vehicle remotely. The vehicle immediately exploded and burst into flames. No one was injured in the explosion; however, surrounding vehicles and property were extensively...
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Cheat Sheet for PSIA, PSIG, Inches of H20, mm Hg
To accurately understand pressure measurements in industrial safety and process engineering, it is essential to distinguish between absolute pressure and gauge pressure, as well as the units commonly used for low-pressure monitoring (such as draft gauges or vacuum systems). The following table provides the conversion relationships between these units, referenced against standard atmospheric pressure...
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Hydrogen is becoming a popular fuel, and the 2024 IFC provides us with an excellent baseline design for these H2 systems
I have worked with three (3) organizations in the past 5 years on their efforts to make H2 an everyday fuel for household appliances, vehicles, and industrial fuels. Each project was a huge learning experience for everyone! But I am a lover of “codes” to establish the baseline design, construction, operation, and maintenance. I looked to my IFC for guidance, and I was not let down....
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WA Paper Mill Event
Understanding an "implosion" (i.e., vacuum) on an atmospheric storage tank
We keep hearing how the tragedy in WA state at the Papermill was some type of tank implosion and then explosion. I have serious doubts about that theory. I think this was just a simple seam/weld failure, possibly caused by Stress Corrosion Cracking (SCC), but I am sure the CSB will get to the bottom of this failure in due time. I come to this conclusion based on all the pics and videos we’ve...
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WRONG CHEMICAL - WRONG TANK event @ WTP
An odor incident at the Gallipolis Water Treatment Plant was triggered by the accidental mixing of two treatment chemicals during a delivery. The incident was isolated entirely to the plant, and officials confirmed there was no threat to the public water supply or drinking water. Incident Breakdown Date & Time: The incident was reported to 911 at approximately 11:24 a.m. The Cause: Water...
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