For a second I thought this was the old news story from last years explosion that killed Tyson Larson, but I just noticed the date and this time it's his brother that is in critical condition. What a tragedy!
The cause of the explosion is most likely not the fact that they were containing hydrogen and oxygen in the same vessel, I would expect them to be smarter than that.
What I think happened is similar to what blows the tops off nuclear reactors, e.g. Fukushima Diachi nuclear plant, and that is Hydrogen is generated, and due to its buoyancy, floats up and accumulates at the top of a poorly ventilated room. Being in a large warehouse, it's easy to think that you are practically in the open and well ventilated working on a bench, but that can be a deadly assumption. They should've had the fans running and the outside vents open, but being summer time and hot outside, they probably had the air conditioning going and the vents to the outside closed to keep it cool inside. That’s why these explosions occured in the Summer time!
EM
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