Line Break is commonly associated with OSHA’s Highly Hazardous Chemicals in its PSM standard and EPA’s Extremely Hazardous Substances in its RMP rule. But SAFTENG members know I use Line Break Safe Work Practice (SWP) outside the PSM/RMP process battery limits. I apply this SWP to energy sources such as steam and even water when the water is pressurized or heated. I have written several LOTO articles discussing DEFINING and QUANTIFYING “hazardous energy.” This tragic event involved water and the “head pressure” generated by water in a tanker truck.
On September 28, 2023, Employee #1 assisted with water tank truck filling operations. There were two (2) people involved in the process. Upon noticing an overflow, the pair rushed out to the truck, and a coworker shut off the hydrant while Employee #1 went to the rear of the truck.
Once the hydrant was off, Employee #1 released the cam lock on the hydrant hose without first closing the intake valve on the truck. This caused water to exit the port where the 3-inch hose had been unlocked, pressurized by the weight of the water coming through the opening. The force of the water caused Employee #1 to be struck in the head by the hose and fall backward onto the pavement.
Employee #1 was killed due to blunt force head injuries.
RISK is EVERYWHERE!