Perfect controlled demolition of twin chimneys - video

[MeJasonT]

Re silos, i grew up on a farm and we were always getting in the silo to get the last of the barley out or clean out any moulded stuff at the bottom. working on the rigs we were made very aware of H2S gas (Hydrogen Sulphide) or rotten egg gas. In its lowest concentration you could smell something like rotten eggs, unfortunately at higher concentrations you would not be able to smell it at all as it would have destroyed your sense of smell - shortly followed by death. water tanks, confined spaces and even rusty steel oil drums can have H2S present. Rusty steel gasses as it decays gents, stale air is where this beast lives. We engineers should all be aware of this silent killer. There was an incident in the UK where a father and two sons died working at sea. The father had entered a confined space and was overcome, his son had not seen him for a while and went looking for him, he climbed into the space to rescue his father and was overcome also. His other son concerned for his father and brother went to find them both, on discovering them he raised the alarm and then climbed into the space to try and rescue them, he later died from the effects of the gas in hospital. There is a very good reason we are scared of dark places as a child. If you enter a space which has not been ventilated for some time or open a container where the air has been left stagnant for some time then please be aware of the risks. If you have ever worked on rusty metal and smelt something that smelt like rotten eggs - that was it, so you know.