At a soaking facility of an industrial plant in the metallurgy sector, the pipeline between a supply tank and a feed pump became clogged and the autoclave only received sporadic feed. Problems had been experienced with the feed over several days. The pipeline was flushed with water to little avail. Because no feed was received in the autoclave, no oxygen could enter to maintain the pressure of the autoclave normally. The blockage was quickly cleared, as a result of which a large quantity of feed, and with it solids that were contained in the blockage, entered the autoclave.

To repair a corroded flange on a 4500 liter sulfuric acid bowser outlet pipe, an angle grinder was being used to prepare the surface for welding. Within a few seconds of starting work there was a bang and an eruption of white, or grey-yellow, smoke from the outlet pipe. The injured person (IP), who was angle grinding the pipe at the time, suffered deep burns to his right inner thigh. The IP was wearing shorts at the time of the incident. It appears the tanker had been used exclusively for the movement of 77% sulfuric Acid in the past.

Leak from faulty hydrogen seal ignited by short circuit between inboard slip ring and outboard slip ring radial lead connection. Hydrogen flame caused damage to brush gear assembly and inboard slip ring.

Explosion in generator area, thought to be hydrogen leak as a result of radial lead seal failure. Extensive plant damage.

Severe hydrogen ingress into the stator coolant system resulted in a fire in the stator coolant head tank, ignition source unknown. No injuries to personnel. Minimal damage to plant.