Please help determine whether the following 2 heat exchangers are pressure vessels; if they are not pressure vessels, please explain why
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I. Heat exchanger (diameter x length x wall thickness): ∅500x4500 x8. Heat exchange tubes (diameter x length x wall thickness): ∅25x4500 x2.5. Tube side – operating temperature: 1.8 Mpa; operating pressure (inlet/outlet): 25/60℃; medium name: C9+C5; number of passes: 2. Shell side – Operating temperature: 0.4 Mpa, operating pressure (in/out): 160/50°C, medium name: diluent, number of passes: 1. II. Heat exchanger (diameter x length x wall thickness): ∅325x4500 x8. Heat exchange tubes (diameter x length x wall thickness): ∅25x4500 x2.5. Tube side – Operating temperature: 1.9 Mpa; operating pressure (inlet/outlet): 10/120℃; medium name: C5+C9; number of passes: 4. Shell side – Operating temperature: 0.5 Mpa; operating pressure (inlet/outlet): 210/190℃; medium name: heat transfer oil; number of passes: 1
To distinguish them from ordinary containers (atmospheric pressure containers), only those containers that meet all of the following three conditions can be referred to as pressure vessels: (1) The operating pressure (Note 1) is greater than or equal to 0.1 Mpa (operating pressure refers to the highest pressure that may occur at the top of the pressure vessel under normal operating conditions; this does not include the hydrostatic pressure of liquids). (2) The inner diameter (for non-circular cross-sections, it refers to their maximum dimension) is greater than or equal to 0.15 m. Moreover, the volume (V) must be 0.025 cubic meters or more, and the product of the operating pressure and volume must be 2.5 MPa·L or more (where volume refers to the geometric volume of the pressure vessel); (3) The medium contained must be a gas, a liquefied gas, or a liquid whose maximum operating temperature is equal to or higher than its standard boiling point. Please calculate the volume
Check the tolerance specifications, and if not, check the drawings
This should be the requirement for tsgr0004; it has been replaced
Both volume and pressure have been reached; you need to consider the physical properties of the medium
Both volume and pressure requirements are met; if the operating temperature is below the boiling point of the medium, it is not classified as a pressure vessel, and the structural design shall still follow GB150.
This post was last edited by wjl7212 on 2020-1-18 at 14:51. The definition of a pressure vessel: it can be classified as such only when all three conditions are met simultaneously. Based on the data you provided, it is evident that the pressure-to-volume ratio meets the requirements specified for pressure vessels ； By consulting the property tables for C5 and C9, it can be seen that the boiling point of various C5 compounds is below 60°C; in other words, C5 is likely to vaporize during the heat exchange process in both of the heat exchangers you mentioned. Therefore, I believe it should be considered a pressure vessel. You should check the design documents for these two heat exchangers to confirm this. The link is to the C5 property table: https://wenku.baidu.com/view/47c256828762caaedd33d44a.html