Liquid Hydrogen Delivery Truck Offloading Valve Failure

First Name
Andy
Last Name
Piatt

A plume of hydrogen gas escaped from the offloading valve of a liquid hydrogen delivery truck while transporting hydrogen to a commercial facility. The plume ignited, resulting in a flash and concussion loud enough to be heard inside the nearby building and to set off the building’s seismic event detectors. A small amount of hydrogen gas continued to escape from the trailer tank and burn until a company specialist arrived to manually shut off a critical valve almost eight hours later.

Unintentional Uncoupling of Compressed Gas Quick-Disconnect Fitting

First Name
Andy
Last Name
Piatt

While filling a sample cylinder with compressed hydrogen gas, a quick-disconnect coupler fitting came loose within a stainless steel laboratory hood, allowing a small purge of the hydrogen gas to escape directly into the hood through ~1/4-inch Tygon tubing. The stainless steel quick-disconnect fitting struck the stainless steel bottom of the laboratory hood and the hydrogen gas caught fire. It is not known what caused the hydrogen gas to catch fire.

Hydrogen Prototype Bus Slips off Jack Stand

First Name
Andy
Last Name
Piatt

An apprentice mechanic lacerated his right forearm while quickly sliding out from under a hydrogen prototype bus when the bus slipped off a hydraulic jack. The apprentice and another mechanic had raised the bus about 1 foot from the ground to position it on jack stands when the hydraulic jack tipped over. The apprentice went to the site medical facility, where he needed five stitches to close the wound in his forearm.

Flash Fire Occurs on Construction Project

First Name
Andy
Last Name
Piatt

A subcontractor employee was using a band saw to cut a 1" metal pipe when a flash fire occurred on the third floor hydrogen fluoride area. Subcontractor employees were removing all piping associated with the Anhydrous Hydrofluoric Acid (AHF) system. These lines were being removed during plant decontamination and demolition (D&D). The subcontractor employee was attempting to cut a 90-degree elbow located at the highest elevation on the 1" line, but the lowest elevation of the overall piping run.

Explosion of an Oven that was Heating Decaborane for Vaporization

First Name
Andy
Last Name
Piatt

An incident involved an explosion of an oven that was heating decaborane for vaporization. In this incident, the heater controller was defective so the heating element was disconnected from the controller and plugged directly into a wall outlet. This situation allowed the oven to reach temperatures in excess of 400 °C within 20 minutes. While the temperature increased, the decaborane continued to expand, causing a significant pressure build-up within the oven. The pressure increase eventually caused the oven's viewing window to burst.

Hydrogen Explosion in Microbiological Anaerobic Chamber

First Name
Andy
Last Name
Piatt

An explosion occurred in a Microbiological Anaerobic Chamber of approximately 2 m3 capacity that contained an explosive mixture of hydrogen and air. A fire followed the explosion, but was rapidly extinguished by staff using fire extinguishers prior to the arrival of fire service personnel. The pressure wave from the explosion blew windows out of the laboratory, with glass hitting a passerby on a path outside and glass shards landing up to 30 m away.

Check Valve Shaft Blow-Out due to Hydrogen Embrittlement

First Name
Andy
Last Name
Piatt

Several workers sustained minor injuries and millions of dollars worth of equipment was damaged by an explosion after a shaft blew out of a check valve. The valve failure rapidly released a large vapor cloud of hydrogen and hydrocarbon gases which subsequently ignited.Certain types of check and butterfly valves can undergo shaft-disk separation and fail catastrophically or "blow-out," causing toxic and/or flammable gas releases, fires, and vapor cloud explosions. Such failures can occur even when the valves are operated within their design limits of pressure and temperature.

Explosion of Materials Adhering to the Inner Surface of a Removed Top of a High-Temperature Vacuum Furnace

First Name
Andy
Last Name
Piatt

The interior of a small high-temperature furnace, approximately 24 inches high by 18 inches wide, became contaminated with an unknown material later identified as magnesium. The furnace was disassembled to clean the unknown material from the interior surfaces, and while attempting to clean the bottom of the furnace, the technician tapped the upper lip of the furnace with a spatula and the magnesium flashed. The technician was stepping back from the furnace when the magnesium flashed. He received minor eye irritation and his eyebrows were singed.

Reactive Chemical Treatment Causes Beaker to Shatter

First Name
Andy
Last Name
Piatt

A violent reaction occurred while hydrolyzing metal in water. The reactive metal treatment began with a review of the chemical inventory and setup of reaction vessels. The sodium metal was cut in shavings and added one at a time to the reaction vessel. After the second addition, an argon purge was added to disperse hydrogen gas faster. After approximately 10 pieces had been treated, the glass beaker shattered, releasing the contents of the reaction vessel (1 liter) inside the hood and causing the chemist's hand to receive superficial cuts.

Subscribe to Minor Injury