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How many types of roofs for storage tanks are used in the petrochemical industry? What are the applications/types of products stored for each type? Why, in large chemical factories, are gases stored in spheres rather than in regular cylindrical tanks? Why do all product storage tanks in a chemical plant have a temperature indicator? What are the main hazards and safety risks in a petrochemical plant? Which process risk analysis methods are you familiar with? When shall be applied? What are the main process parameters to control in a distillation column? Please develop your answer. What are the main process parameters to control to maintain the safe operation of a fired heater? Please develop your answer. [ ·¢×ÔÊÖ»ú°æ http://muchong.com/3g ] |
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Why, in large chemical factories, are gases stored in spheres rather than in regular cylindrical tanks? answer: This type of vessel is preferred for storage of high pressure fluids. A sphere is a very strong structure. The even distribution of stresses on the sphere's surfaces, both internally and externally, generally means that there are no weak points. Spheres however, are much more costly to manufacture than cylindrical vessels. Storage Spheres need ancillary equipment similar to tank storage - e.g. Access manholes, Pressure / Vacuum vent that is set to prevent venting loss from boiling and breathing loss from daily temperature or barometric pressure changes, Access ladders, Earthing points, etc. An advantage of spherical storage vessels is, that they have a smaller surface area per unit volume than any other shape of vessel. This means, that the quantity of heat transferred from warmer surroundings to the liquid in the sphere, will be less than that for cylindrical or rectangular storage vessels. |

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