icanfixall
Official GMM hand model
Vacuum is a funny animal. When vacuum is pulled on something we have a void of pressure or absence of pressure. Many times the pressure is holding something nuetral. Now pull a vacuum on a beer can and see what happens. Is it the vacuum crushing it or the atmosphere pressure crushing it.... Well its the atmosphere crushing it. All the atmosphere outside something that under vacuum is trying to get back inside to nuetralize the pressures. That outside atmosphere is nearly unlimited in scope compared to the tiny bit of vacuum in the chamber. The sudden rush of air into a vacuum has a dianamic effect. Things can and will explode violantly from the shock.. Its kinda like the effects of water hammer in a pipeing system like found at a steam plant.. I have seen that happen from a distance. I sure was glad to be far enough away from that. The schedual 80 12 inch line danced so hard that all the fiber insulation simpley disolved into the air. When we attemptd a repair to that line it was incredible how much force we need to move the line back into place. Several 5 tons chainfalls were used. Just getting those in place we needed smallr 2 ton chainfalls to move them up to the slings... It makes a man feel so weak and small..