Oil and Its products are compositions of multiple hydrocarbons. In the process of exploitation,refining,storage&transport,distribution and using,inevitably,there will be some liquid hydrocarbons escape into air because the limit of technology,facilities and so on. That cause a great deal of ullages.Considering of the facts,the number adding up of the evaporations is astonished.How to lower down the evaporations is the important but difficult problem to the professional managers of storage&transport.Besides the evaporations,there are the other ullages in the process because of flowing,insufflation,dripping,outleakage and commixing.Mostly,these ullages arised for the careless of the workers or the managers, or the trouble of the facilities.That's easy to avoid for it's accident reason.
纯人工翻译,花了半小时,++分哈
