Is external pressure verification required for the inner tube of the jacketed tube?
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If the pressure of the medium inside the jacket is higher than the pressure inside the tube in the jacket, is it necessary to perform wall thickness calculations using the pressure of the medium inside the jacket as the external pressure? Experienced folks, hope to share this. Thanks!
It is generally not necessary. The design pressure of the inner tube is the maximum pressure difference between the inner and outer tubes. For specific provisions, please refer to clause 4.1.1.2 \"Principles for determining the design pressure\" f) of \"GB/T 20801.3-2006 Code for pressure pipelines – Industrial pipelines – Part 3: Design and calculation\". f) When the pipeline is divided into several separate pressurized sections by partitions (including jacketed tubes, blind flanges, etc.), the design pressure of such partitions shall be not less than the pressure corresponding to the most severe combination of pressure difference and temperature that may occur in the pressurized chambers on either side during operation ； For your reference