How should a 20,000 m3 LPG storage tank at low temperature and normal pressure be designed?
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The tasks of this design are: (1) to design a 20,000 m3 liquefied petroleum gas storage tank in accordance with API 620 of the American Petroleum Institute and the design standards for steel low-pressure moisture tanks. The basic design parameters are as follows: design pressure: 0.015 Mpa, volume: 20,000 m3, design temperature: -45°C, design wind pressure: 1626 Pa, **seismic intensity: 7 degrees, liquid density: 583.5 Kg/m3. (2) Conduct research on the material selection for low-temperature storage tanks. Complete the design calculations for the storage tank, primarily the design calculations for the vault, and carry out preliminary design calculations for the wall thickness ； And research was conducted on the material selection for low-temperature storage tanks; it simply couldn’t be calculated. . Many things in the HG20517-92 standard are hard to understand. Why do we need a sink? What is a hanging loop then? How to choose among the three types of gas cabinets? What is an event festival again? I have no idea at all; my major is Process Equipment Control. I haven’t learned any of these. I hope teachers who know the answer can give some guidance. It’s mainly about how to calculate the tank walls and the vault.
LPG cannot be stored in gas cylinders. At atmospheric pressure, the saturation temperature of LPG is relatively low; a single insulation layer is not sufficient to keep it cold, so a double-walled tank is necessary. For specific details, you can consult professional manufacturers or search on Baidu. The above are my personal opinions; I’m not sure if storing LPG in gas cylinders has ever been effective!
The original poster has completely mixed up the concepts. A gas cylinder is a steel container device used for storing various industrial gases, as well as for balancing fluctuations in the demand for these gases. They can be divided into two main categories: low-pressure gas cabinets and high-pressure gas cabinets. The former comes in two structures: wet and dry. LPG is short for liquefied petroleum gas, and it can be stored in either spherical tanks at normal temperature and high pressure or in tanks at low temperature and normal pressure. The operating temperatures of low-temperature storage systems range from -5 degrees to -42 degrees, depending on the type; the design pressure is between -0.5 and 14.5 KPa. These two are completely different things. In simple terms, gas cabinets are used for storing gases, while low-temperature, normal-pressure tanks are used for storing low-temperature liquids, and they require a refrigeration system as well as insulation measures.
Reply to 3# Storage and Transportation Engineer: Well, that’s what our teacher said – we should use this standard for the calculations.
I recommend API620; could you ask your teacher if that can be used?
Reply to 5# Storage and Transportation Engineer: I asked the teacher today, and she said that low-pressure moisture cabinets are mainly used for calculating the vault height. Do you have a Chinese version of API620? Could you send me one? Thank you.
Reply to 5# Storage and Transportation Engineer: GB3531-2008 – Low-alloy steel plates for low-temperature pressure vessels. There is also this standard at http://bbs.hcbbs.com/thread-417476-1-1.html. Could you help me get it? Thank you.
API620 has been released~ Thanks to the forum for sharing it.
Liquefied petroleum gas is stored at low temperatures and normal pressure; gas tanks are not allowed, and only storage tanks with double-shell structures can be used, along with a reliable insulation system. It is understood that large design companies such as Sinopec Engineering Corporation, China Global Engineering Corporation, and China Chengda Engineering Corporation collaborate with foreign parties to carry out the design and construction.
Reply to 9# wang8698: This is my graduation project. I haven’t even signed with the design firm. = =!
Reply to 9# wang8698: Adding insulation measures to a single layer is also an option.