Questions regarding the design parameters of internally jacketed vessels
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https://bbs.hcbbs.com/forum.php?mod=attachment&aid=MzYxOTYyM3xjMjI1NDY3ZXwxNzcyNzYyMDU4fDk1NzMyMnw1NzE0NzMz&noupdate=yes As shown in the figure above, it is just a structural diagram; there’s no need to worry about the details. This internal jacketed reactor has left me a bit confused; I would like to ask the experts whether the following design parameters are correct? Reactor cylinder: Operating pressure: 0.8 MPa, design pressure: 0.88 MPa; Operating temperature: 20°C, design temperature: 40°C. Inner jacket cylinder: Operating pressure: 5 MPa on the inside/0.8 MPa on the outside, design pressure: 5.5 MPa; Operating temperature: 200°C, design temperature: 220°C℃
This post was last edited by Rappy on 2026-3-6 at 15:48. The diagram above seems odd; after all, using an external jacket is the standard approach, and there’s nothing wrong with that. The client insisted on a bizarre design with a so-called “internal jacket”. . .
Change the diameter to be flush on the inside; for details, refer to the Comprehensive Book of Equipment Design – Storage Equipment.
There’s no need for the jacket between the flanges to be this thick – 0.88 MPa is sufficient
You can completely replace the internal jacket with internal coils; it’s difficult to ensure full weld penetration in this case, and it’s easy for the product to fail quality checks.
I would like to ask how to verify the flanges of equipment with this type of structure – should it be based on negative pressure?