Ratio of width to thickness of the reinforcement ring
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This post was last edited by SDHZZXM on 2017-7-17 at 14:22. The image shown is a screenshot from an older document; what is the reason why the ratio of the width to the thickness of the reinforcement ring should not exceed 5? Is this consideration still in place now?
This information is too old. There are no such restrictions now; it is possible to use flat steel with dimensions of 150X20 when performing calculations for the outer pressure cylinder in SW6. Of course, if the aspect ratio is too large, there is a stability issue with the rib plate itself.
Both the reinforcement on the flat cover of steel welded atmospheric pressure vessels and the spiral guide vanes in mechanical stirring equipment have specified maximum height-to-diameter ratios (16 and 8 respectively). In my opinion, this requirement is mainly due to the fact that the reinforcing ring has a range within which it exerts a reinforcing effect; beyond that range, its effectiveness decreases. For example, in the case of reinforced flat lids for atmospheric-pressure vessels, the reinforcement area of such flat lids covers an area 10 times the calculated thickness of the lid. For vessels with a true shape, an external pressure reinforcement ring is provided; when calculating the moment of inertia, the cylinder also has a reinforcement zone (GB150 4.5.1.1).
For the two standards regarding steel welded atmospheric pressure vessels and mechanical stirring equipment, check their standard numbers.