Ethylene Plant Knowledge (Technology) Questions 12.23

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This post was last edited by yanran88 on 2009-12-23 at 20:41. Questions on knowledge (technology) of ethylene plants – 12/23. Everyone is welcome to actively participate in the learning and discussion of professional basic knowledge in the petrochemical technology exchange area! At the same time, I hope other moderators will also participate in this activity, taking turns to come up with questions and discuss various sets of devices! Let’s work together to promote the development of the petrochemical technology exchange zone! The maximum score for this activity is 20 Wealth points. Friendly votes and repeated votes are not allowed; please be careful when posting. Posts that are edited will not be counted as valid votes! Those who have different opinions regarding the suggested answers can post discussions the next day, and those who provide solutions or their own opinions on the daily questions will receive appropriate rewards! The focus is on participation, and there are prizes for participating! To prevent the answers of some members from affecting others, please hide your posts when answering questions. Thank you for your cooperation. For specific hiding methods, see: http://bbs.hcbbs.com/viewthread.php?tid=492556&highlight=%D2%FE%B2%D8 Thank you all for your participation! Learn more*, communicate more, gain more! True or False: 1. The single-unit trial run is planned and carried out by the design unit, with the construction unit participating. 2. The scope of intermediate handover for the installation should ideally cover the entire project, but in practice, one unit area is completed first and handed over, so that production staff can be involved as early as possible to carry out training, as well as to create the conditions for the three inspections, four determinations, and various commissioning activities. 3. The items included in the intermediate handover of the installation are the completed work, specialized tools, and remaining materials; the handover of related technical documents is not included. 4. The network diagram is the foundation of network planning technology and also the graphical representation of a plan. 5. The network diagrams do not include a time axis, and the length of the arrows can be drawn arbitrarily. 6. The driving network plan reflects and represents the overall arrangement of the driving schedule in the form of a network diagram. 7. In a driving network diagram, as activities progress in one direction, circular paths can occur. 8. When the oxygen content is greater than 19.5%, and the organic matter content is below the permissible levels for hygiene or below the lower explosive limit, the conditions are met to allow access inside the equipment for maintenance and hot work. 9. When adjusting the orientation of 9-inch or 8-inch blind flanges, gaskets of the same pressure rating and material must be installed on both sides of the blind flange. 10. The storage tank of the road tankers used for transporting ethylene is a double-layer tank; its inner layer is made of low-temperature steel, while the outer layer is made of carbon steel. Between the inner and outer layers there is a solid insulation layer or a vacuum insulation layer. Reference answer: 1 (×) The construction unit and the design unit are involved / 2 (√) / 3 (×) It also includes the handover of random technical documents and preliminary assessments of project quality. /4(√)5/(×) In general, network diagrams do not include time coordinates; however, in some cases it is necessary for such diagrams to have time coordinates. In those cases, the length of the arrows should be determined according to the proportion of time required for each task. /6(√)/7(×) – no circular routes are allowed. /8 (×), and a equipment entry permit must be obtained; the equipment entrance must be supervised, with necessary first-aid supplies ready. 9/ At both sides of the blind flange, gaskets of the same pressure rating and material should be installed; the material and pressure rating must comply with the specifications. /10 (√)