EVEN A SMALL AMOUNT OF WATER CAN KILL

Employee #1 and a helper entered a lift station to unclog the system. Employee #1 called out to the helper that he was having trouble breathing and needed help exiting the lift station. The helper inserted the
ladder into the lift station and attempted to help Employee #1 climb up but could not hold on to him because his hand was slippery. Employee #1 slumped into the bottom of the lift station and his mouth and nose were partially submerged in the water. He was transported by emergency services to the hospital where he died of respiratory failure resulting from sewage water in his lungs

Emergency Isolation for Hazardous Material Fluid Transfer Systems – Applications and Limitations of Excess Flow Valve

 https://archive.epa.gov/emergencies/docs/chem/web/pdf/efv_alert.pdf

ARE YOU IDENTIFYING ALL SOURCES OF ENERGY FOR LOTOTO?

On October xx, 2009, an employee was working for the XXX Public Utilities Commission-Wastewater Enterprise as a trainee. There were four people to perform preventive maintenance for the fans at the wastewater treatment plant that day. The employee and a Coworker #1 were servicing the fans in Room Number 201 while the foreman and Coworker #2 were in an adjacent room. There were four supply fans. The employee was working onXX1-1 while Coworker #1 was working on an adjacent fan.
The fans were shut down, tagged-out, and locked-out. The employee proceeded to remove the enclosure metal guard to expose the belt and pulley drive for the inspection. Although the fan was tagged and locked- out, it was not blocked-out. The exhaust fans in a room below were not stopped. Their operation created an airflow which traveled through the same duct system as for the supply fans upstairs. The air flow through the duct caused the supply fan blades to spin freely. The fan blades were not blocked before servicing. At approximately 8:30 a.m., when the employee was removing the enclosure guard for the V-belt and pulley drive of the spinning fan, the in-running nip point amputated his left middle finger. He
screamed as Coworker #1 came to his aid. He was taken to XXX Hospital by Coworker #1. He was treated and released the same day.

3 Employees Killed, 2 Injured By Hydrogen Sulfide Exposure

 Employee #1 was inside a frac tank shoveling residue (called BS) to one end of the tank for subsequent vacuuming and removal. As he completed the task, the tank was washed down with waste water containing hydrogen sulfide. Approximately 8 minutes following the waste water entrance, Employee #1 collapsed from exposure to the chemical. Employee #2 entered the tank and attempted to rescue Employee #1, but he too collapsed. Apparently Employees #3 and #4 entered the tank and attempted a rescue and but succumbed also. Employee #5 attempted to revive Employee #1 through an opening at the end of the frac tank. He was affected by the hydrogen sulfide gas but was able to call the city's first responders. Employees #1, #3, and #4 died of hydrogen sulfide exposure. Employees #2 and #5 were hospitalized. 

Source:Osha.gov

EXPLOSION IN SALT WATER TANK

At approximately 2:30 a.m. on July 30, 2011, Employee #1 was working the night shift at a saltwater disposal facility. Specifically, the facility specializes in the disposal of salt water that is contaminated with field oil waste. The water would usually be separated from the oil and petroleum based materials in a settling tank. The water would then pumped back into the ground through an injection well, while the oil based material is gravity drained into a series of collection tanks. The oil would then sold to oil recyclers. During Employee #1's shift, he was monitoring two oil collection tanks that were connected to a separation drum tank. 

The first of the two tanks was also connected to the second tank to allow for spillover as the amount of liquid rose. Under normal operation, the tanks would take several days to become full; however, facility operators would frequent the catwalk area that was accessed by way of a ladder to gauge the tanks levels. After receiving a water delivery from a full tanker-truck, Employee #1 accessed the catwalk to gauge the water level. Soon after reaching the tank area, an explosion occurred. The truck driver, who was leaving the facility, observed the explosion and following fireball in his rear view mirror. The driver immediately stopped his truck and contacted emergency services. Despite the fire spreading to both tanks, Employee #1 was able to escape the fire crazed area; however, his clothes were completely burned off and over ninety percent of his body was burned. Employee #1 collapsed on the front porch area of the facility office, where emergency personnel, a short time later, began treatment. Employee #1 was taken by helicopter to Ardmore Hospital, where he died. The accident investigation revealed that Employee #1 had a history of smoking near the storage tanks and had been warned by the employer to stop several times. 

Source:Osha.gov