<blockquote><font class="small">In reply to:</font><hr /><p> I took particle count samples of Nitrogen Tetroxide (NTO) ... never even got burned, let alone had an explosion.<p><hr /></p></p></blockquote><br />Despite both being nitrogen oxides, nitrogen tetroxide (N2O4) relevant properties are almost opposite of those of nitrous oxide (N2O). Tetroxide at room temperature is mostly liquid or low pressure gas, highly toxic and chemically active. Nitrous oxide (N2O) is self-pressurising to 5 MPa, practically non-toxic (only in large concentration over long period of time) and relatively inert. What happened at Scaled, as far as I know, was not chemical explosition or poisonous leak, but evaporation blast and cold burns. It could just as well be liquified air.<br /><blockquote><font class="small">In reply to:</font><hr /><p>Something was VERY amiss when supposedly even safer procedures went so very wrong! <p><hr /></p></p></blockquote><br />Various pieces of info hint to someone opening the wrong valve at the wrong time. Not exactly QA area of responsibility.<br /><blockquote><font class="small">In reply to:</font><hr /><p>Could this be just one of the reasons that such companies as Boeing and LM have such strong Quality Assurance programs<p><hr /></p></p></blockquote><br />Accidents happen at those companies too, including even more spectacular failures with actual flight hardware. If Scaled's cause was in fact human mistake, it's many times better than faulty design.<br /><blockquote><font class="small">In reply to:</font><hr /><p>IF the price is the very lives of the good people doing these things, perhaps it is just a little too much to pay!!<p><hr /></p></p></blockquote><br />Rhetoric. With 3 deaths over 25 years working at Scaled is hardly among most dangerous occupations.<br /><blockquote><font class="small">In reply to:</font><hr /><p><br />In this kind of industry (an industry that I spent some 37.5 years in) safety and reliability are not just anything, they are EVERYTHING, even over costs!!! <br /><br />IF you don't re</p></blockquote>