Regarding the issue of the minimum wall thickness of containers
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Considering the stiffness of the container, it is generally required that the wall thickness have a minimum value. Is this minimum wall thickness empirical, or can it be calculated? I don’t quite understand
It’s mainly based on experience, I guess. I once saw a formula in some book before, but I’ve forgotten it now. It’s similar to the one in GB151 – it specifies the minimum thickness of the cylinder, but it doesn’t state whether that value is calculated or based on experience. I suppose it’s derived from insights gained from previous equipment.
For steel containers, the primary considerations are stiffness, stability, and strength. The minimum values are still based on experience.
Calculated by a qualified pressure vessel inspection agency! I would like to ask: for newly put into use high-pressure and ultra-high-pressure pressure vessels, how do you handle the situation when there is no prior experience in this area? (The minimum wall thickness is an important criterion for the retirement of pressure vessels.) The minimum wall thickness for the high-pressure vessels in our unit is determined by a specialized inspection agency! This post was last edited by cad168 on 2009-4-9 20:49 ]
Some sources suggest using 3800 as the threshold: values below this figure are calculated at 2D/1000, while those above it require consideration of costs related to on-site manufacturing and materials. There are also other formulas; JB4710 mentions this as well, with the main focus being on the stability of the equipment during installation and transportation.
The minimum wall thickness is determined based on clause 5.2 regarding cylinders in Chapter 5 of the general standard GB150, which deals with pressure vessels in cylindrical form. For the specific regulations, it is best to refer to GB150 itself; I’m not quite sure about the details.
For the cylinder, it is based on experience; for the head, it is determined through calculations
The minimum wall thickness is determined based on calculations and practical experience.
The minimum wall thickness is determined based on calculations and practical usage experience!
It should be the result of combining calculations with years of production experience; once it becomes part of regulations, it becomes an established practice
The minimum thickness of the shell, as specified in 3.5.6 of GB150, after processing but before taking into account corrosion allowance: a) for containers made of carbon steel or low-alloy steel, it shall be not less than 3 mm； b) For high-alloy steel containers, not less than 2 mm. This should be the most basic requirement; are there any other standards with related requirements? If so, give a clear indication.
The minimum thickness of the shell, as specified in 3.5.6 of GB150, after processing but before taking into account corrosion allowance: a) for containers made of carbon steel or low-alloy steel, it shall be not less than 3 mm； b) For high-alloy steel containers, not less than 2 mm. This should be the most basic requirement; are there any other standards with related requirements? According to strength requirements, this is the correct solution. Based on stiffness requirements, if the diameter is less than 3800 mm, the wall thickness = 2XD(diameter)/1000; if the diameter is greater than 3800 mm, the wall thickness = D/1000 + 4
It’s mainly based on experience, and deformation also needs to be taken into account during construction
The main considerations are equipment transportation, the strength required for lifting, and the corrosion allowance. Even if we were to make a atmospheric pressure water treatment device, it’s impossible to use sheets that are 1-2 mm thick for its construction.