Container cone angle value
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The container cone angle values in GB/T150 are 30 45 60 > 60. The existing atmospheric pressure tank has a cone apex angle of 78°. Now we need to calculate the cone apex. GB/T150 states stress analysis or calculation based on a flat cover. Which calculation standard should be used? Is it reasonable to obtain 78°? Please give me some answers, I'd be very grateful!
Atmospheric pressure vessels do not have to comply with GB/T150, such structures are very common.
But is this angle the best value?
According to Article 7.3 of GB51341-2014
Normal pressure of 10 to 15 degrees is fine
Normal pressure and small diameter can be considered as cone-top tanks, not GB150.
Small tanks under normal pressure can be considered as cone-top tanks. The half-cone angle is considered normal between 75 and 80 degrees. There is no need to design according to GB150. Even for small-diameter tanks with some pressure, a conical head with a half-cone angle greater than 70° can be used. The calculation can refer to HG/T20582.
If it is a storage tank, it is best to make the tank top a weak connection structure, with a slope of no more than 1/6, and the corresponding angle should be less than 9.46 degrees.
The normal pressure cone top angle is 10-15 degrees, the diameter is greater than 4 meters, and the cone top is reinforced.