Problems with stress
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This post was last posted by sxf1028102800 on 2017-11-30 15:28 The editor uses the same type of carbon steel to make tanks with different volumes, such as a 500-square-meter oil tank and a 30-square-meter oil tank. Why can a 500-square-meter tank only bear a few kilograms of pressure, while a 30-square-meter tank can withstand tens of kilograms? (We use Q235 to make a 500-square-meter tank, and the pressure withstand is 1-2 kilograms, while tanks of dozens of square meters are also made of 235 and can withstand tens of kilograms.) I don’t quite understand. Please tell me and give me extra points.
Well, I will only tell you that there is a pipeline below DN50 in the pressure pipeline that is not a pressure pipeline. You can digest and understand the rest by yourself.
Anyone who has engaged in pressure vessel design should know that the larger the equipment under the same pressure, the thicker the wall thickness required. This is supported by a calculation formula. I haven’t designed a pressure vessel in a few years, and I have forgotten the formula.
conversely: The larger the diameter, the greater the stress when bearing the same pressure, and the greater the thickness required without exceeding the allowable stress of the material.
The relationship between the calculation formula of wall thickness is: pressure times diameter divided by allowable stress. For the same material, same temperature, and same thickness, the allowable stress is the same. So the larger the diameter, the greater the wall thickness required for the calculation. In turn, the same wall thickness. The larger the diameter, the smaller the carrying capacity.
Look at the formula yourself, experience and understand it
There is also the factor of the oil's own weight. The oil with a large volume has a large self-weight + the pressure in the tank, and the oil with a small volume has a small self-weight + the pressure in the tank.； As for the wall thickness, economic rationality must be considered.
What does it have to do with pressure pipes?
because* * Special equipment standards include pressure pipes as special equipment.
What does it have to do with this issue? .