Selection of wall thickness at a design pressure of 0.06 MPa
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I have a question: when the design pressure of a container is very low, for example, 0.06 MPa gauge pressure, with an inner diameter of 2800 mm, made of material Q345R and a length of around 17,000 mm, the wall thickness of 6 mm would be sufficient based on calculations considering internal pressure; however, it’s not possible to use such a thin wall thickness in practice. Is the thickness determined based on experience, or is there a formula used for verification, such as to check its stability?
The support method should also be considered; if it is saddle support, calculations are required, and these can be done using the SW6 horizontal container
The value of thickness must take into account not only the internal pressure strength but also requirements related to installation, transportation, and support. It is estimated that the owner’s equipment is horizontal, and a saddle is also required to calculate the stress on the cylinder. If the equipment has a liquid level and the static pressure of the liquid column exceeds 5% of the design pressure, then the static pressure of the liquid column should also be taken into account in the calculated pressure.
It means considering not just the effect of internal pressure
Firstly, I think we should consider whether there is enough corrosion allowance first–carbon steel is prone to corrosion. Secondly, your container must meet the NB/T47003.1 standard, which provides relevant checking formulas; there are also some guidelines based on personal experience regarding the amount of allowance needed. If the required allowance is 6 mm, the actual wall thickness I would choose would likely be over 10 mm. Of course, assuming no other factors are considered, the thicker the better~
This post was last edited by gn_1984 on 2014-9-23 09:53. Is the container a storage tank? It would be advisable to conduct a negative pressure check to assess its stability； When considering internal pressure, whether to take into account the static pressure of the liquid column in the tank depends on the parameters of the equipment in question; this equipment should probably be supported by a skirt
I was wrong just now; it should be in accordance with the standard SH3046 or GB50341
It should be designed according to the requirements for towers or storage tanks; with a height of 17 meters, the wind pressure is likely to be high, so verification is necessary
The calculated internal pressure thickness of 6 mm merely meets the strength requirements; other aspects also need to be verified
For horizontal installation, a thickness of at least 10 mm is recommended. Our models with a diameter of 2400 mm have a thickness of 10 mm. Of course, it’s necessary to carry out calculations to verify the saddle section as well