Chemical Process Safety (PSM/RMP)

Leak Testing Fatality GDC Citations

OSH ACT of 1970 SECTION (5)(a)(1):  The employer did not furnish employment and a place of employment which were free from recognized hazards that were causing or likely to cause death or serious physical harm to employees in that employees were exposed to struck-by hazards: The employer did not establish, communicate, and implement safe work…...

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Excellent explanation of the HFO-1234yf transition

This video is from 2013, but I thought they did such an excellent job explaining 1234yf and how we went from 134a to this new refrigerant I should share it for context.  I have been very hard on the suppliers of this new Low GWP refrigerant over the years and this video sums up the…...

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Line Break Gone Bad (Cl2 Bleed)

At approximately 7:00 p.m. on November 15, 2006, Employee #1 was a process operator at the Chlorine Liquefaction Unit, Block A-19. He was preparing to bleed off chlorine on a process line, to clear the line for maintenance work. The valve handle indicated that it was in a CLOSED position. Employee #1 opened the cap to…...

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Cl2 release at corn and flour milling facility from ruptured vacuum regulator

At approximately 2:30 p.m. on March 2, 2011, six workers were employed as milling or planing machine operators at a corn and flour milling facility in Lincoln, NE. A chlorine leak was detected in the chlorine room, so the milling superintendent and a miller/operator entered the chlorine storage room and closed a manual valve on…...

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When inches matter in our design basis

Bollards… they are more than sticks in the ground!  In fact, there is an actual code design basis for bollards (i.e. posts).  There are six (6) CRITICAL METRICS for bollards, of which five (5) we can see and one (when done properly) is invisible to those of us who inhabit the surface of the earth.  So what can we see…...

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Valve fails while being turned and releases 200 pounds of NH3 leading to 1st and 2nd degree burns

On October 4, 2005, Employee #1 was working as a refrigeration mechanic. An ammonia system valve in freezer Number 7 was being turned, when the bonnet came loose with the wheel, releasing approximately 100 to 200 lbs of ammonia. Employee #1 was 35 feet up without fall protection, and he had to slide down racking…...

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Hazards of improper pressure testing – Employee Is Killed When Refrigeration System (commercial) Explodes

As I have written about numerous times… PRESSURE TESTING a process is not only a “good idea” – it is REQUIRED for those of us in the process safety world. It is a critical path in process safety, ensuring our “primary containment” system (e.g. piping) was installed properly and can withstand process pressures. But with…...

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Ammonia Evaporator not LOTO’ed leading to 68 pound release and 4 hospitilizations

On May 31, 2012, Employees #1 through #6 were working when an evaporator that had been deactivated was mistakenly activated by a worker.  Approximately 68.5 pounds (31 kilograms) of ammonia were released on an overhead catwalk. Employees #1 through #6 inhaled the fumes, and they were transported to a hospital. Employee #1 was not hospitalized,…...

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Liquid ammonia causes frostbite injuries to sanitation employee working on Evaporator drain pan

At 4:00 p.m. on January 5, 2018, Employee #1, employed by an industrial cleaning company, was working at a multiemployer project. He was working from an 8-foot stepladder. He was 2 feet above the ground and monitoring and adding water as necessary to evaporator pans to prevent freezing. The float system on the evaporator failed,…...

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My Aussie friend in safety ROCKS!

Many thanks to Luke Dam, CEO of Safety Wise, for having some fun and making these SAFTENG videos.  If you’re looking for a great incident investigation tool be sure to check out Luke’s company… they are worldwide and they make root cause analysis easy (something many struggle with).    … Membership Required You must be...

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Is there a difference between a vapor and a gas?

ABSOLUTELY!  One of my engineering managers early in my career was the founder of the “engineering geek squad” and was an absolute stickler for details when it came to technical matters.  He always told me I was driving him to the insane asylum with my improper interchangeable use of the terms “vapor” and “gas” when…...

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Did we just experience an NH3 Worst-Case Release Scenario?

This morning, North of Chicago, a 2,000-gallon (8,750 pounds of NH3) nurse tank appears to have suffered a catastrophic failure releasing all 1,700 gallons/8,750 pounds of NH3 onto the road and ditches.   The reason I wonder if this was in the realm of a “Worst Case Release Scenario” is that we had Temps in the…...

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