weak vessel
2.serious abrasion occurred at tower wall which caused multiple non-planned emergency shut down ever since500#vaporizer of YangZi petrochemical company olefin plant ethandiol unit was commissioned and start-up in1987.it analyzes the mechanism of abrasion happening in the right of designated process feature of the vaporizer and concludes that-high temperature and weak acid water-soluble media is basic reason causing the abrasion,flushing of high velocity media to vessel wall is direct reason causing thin wall thickness.
4.The mixing time and the mixing degree of liquid-liquid was studied in a vessel of inside diameter of 600mm with apropeller-type agitator,and the correlations were provided for strong nixing and weak mixing,which can be used in the design of mixing equipment or for the improvement of agitated reactors.
5.The cerebral saccular aneurysms, CSAs are persistent localized dilatation of the vessel wall, which exist in abnormal weak structure. CSAs is the most cause of subarachnoid hemorrhage, SAH, which happen acutely, progress promptly, danger life, and cause critial neurologic deficits. The arteriovenous malformations, AVMs, is the most disease in the cerebrovascular malformations.
