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I'm a mechanical engineer working in the boiler industry and currently dealing with EN 12953, specifically Clause 10.2.8: Loads on stay tubes and bar stays. According to the standard, the end plate is split into sub-areas, each assigned to a stay tube or bar stay. This distribution is used to calculate the pressure load each support element carries and eventually determine the required thickness of the end plate.

However, I'm having trouble understanding how exactly the standard defines and separates these pressure-loaded areas. Despite reading the explanation and reviewing Figure 23 from the standard, I haven’t been able to replicate the area divisions.

How are the boundaries between adjacent supports (especially at the edges or near irregular arrangements) determined?

I’ve attached the relevant excerpt and figure from the standard for reference.

Any help—be it a clearer explanation, a worked example, or a rule-of-thumb approach—would be greatly appreciated!

Thanks in advance!

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teo benai
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1 Answers1

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I think the method works similarly to Voronoi diagram. Border between 2 neighboring tubes is constructed using line which lies between the points. When you connect the points with straight line and then construct a perpendicular line in the middle, part of this line will form the border. When you do this with all neighbors of a tube, resulting lines will enclose the pressure area associated with the tube.

For getting clarification from experts who take care of the standard, there used to be Helpdesk at DIN, but it was canceled recently. Secretariat of the work group is at French AFNOR, so you could use the contact form there for asking the question.

Tomáš Létal
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