The analysis shows that there is a long 3 reasons caused by The one caused by the cylinder cover body bent close tank did not close.Three caused by bolt used in the bowl is small. The force from the bowl is not enough. To press the gasket sheet sheet and the tank body bent, so gap. When the pressure inside the tank is greater than the force that is used to press the lid tank.
.To prevent leak pail lid should look like. The flange surface lift.) Increase the size and thickness of the cylinder cover and the flange is tailored it through the center 300 mm and 10 mm, respectively, change size bolt. M12.22.213 Newton were 15 bolt, gasket used Teflon (PTFE) thick 3 mm. เส้นผ่านศูนย์กลางภายใน size 217 mm. The outer diameter size 244 mm. The cylinder cover is designed to accommodate the new pressure 12 bar
.Key words: cooling superconductor, the lid tank, refining process, nitrogen, bolt, gasket sheet, deflection, the leakage of the lid
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