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Imploding vacuum tanker
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<blockquote data-quote="Munkul" data-source="post: 8066210" data-attributes="member: 73308"><p>Haha, I know enough to be dangerous anyway! I have done 4 years of Asset integrity for a industrial manufacturing company, developing the job role from nothing.</p><p> Vessels and pipework containing steam, compressed air, and nasty chemicals - keeping things legal, inspected, and safe. 3 major regulations keep me in the job - PSSR, COMAH and DSEAR.</p><p></p><p>PSSR applies to any vessel containing steam at any pressure, and pretty much any substance held under pressure. Compressed air receivers fall under PSSR if they are bigger than 250 bar.litres (pressure x volume) so if you have a big old compressor on farm, keep quiet <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink ;)" loading="lazy" data-shortname=";)" /></p><p>Some things are generally exempt (e.g. military stuff, refrigeration systems under 25kw); some things are specifically exempt like slurry tankers.</p><p></p><p>It's more or less a common-sense regulation - about stored pressure energy, and preventing failures. Especially steam. That's why they're not too bothered about slurry tankers imploding themselves. Very unlikely to hurt someone.</p><p></p><p>It's the shape of the vessel that determines whether it fails on vacuum or pressure. A cylinder is always stronger from the inside than the outside.</p><p>A vaccum tanker operates roughly between -1bar and +1bar pressure, if atmospheric pressure is 0.</p><p>-1bar vacuum = +1bar atmospheric pressure higher on outside.</p><p>Eventually a vac tanker corrodes to the point where it can still hold 1bar internal pressure, but not 1bar external pressure.</p><p>So it will nearly always fail under vacuum first, and this will buckle it inwards.</p><p>If that makes sense?</p></blockquote><p></p>
[QUOTE="Munkul, post: 8066210, member: 73308"] Haha, I know enough to be dangerous anyway! I have done 4 years of Asset integrity for a industrial manufacturing company, developing the job role from nothing. Vessels and pipework containing steam, compressed air, and nasty chemicals - keeping things legal, inspected, and safe. 3 major regulations keep me in the job - PSSR, COMAH and DSEAR. PSSR applies to any vessel containing steam at any pressure, and pretty much any substance held under pressure. Compressed air receivers fall under PSSR if they are bigger than 250 bar.litres (pressure x volume) so if you have a big old compressor on farm, keep quiet ;) Some things are generally exempt (e.g. military stuff, refrigeration systems under 25kw); some things are specifically exempt like slurry tankers. It's more or less a common-sense regulation - about stored pressure energy, and preventing failures. Especially steam. That's why they're not too bothered about slurry tankers imploding themselves. Very unlikely to hurt someone. It's the shape of the vessel that determines whether it fails on vacuum or pressure. A cylinder is always stronger from the inside than the outside. A vaccum tanker operates roughly between -1bar and +1bar pressure, if atmospheric pressure is 0. -1bar vacuum = +1bar atmospheric pressure higher on outside. Eventually a vac tanker corrodes to the point where it can still hold 1bar internal pressure, but not 1bar external pressure. So it will nearly always fail under vacuum first, and this will buckle it inwards. If that makes sense? [/QUOTE]
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