Area Distribution Around Stays in EN 12953 Boiler Standard (10.2.8)

Thread starter Theodoros Benai
Start date Jun 1, 2025

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SUMMARY

The discussion centers on the interpretation of Clause 10.2.8 of the EN 12953 standard, which outlines the distribution of loads on stay tubes and bar stays in boiler design. The standard specifies that the end plate is divided into sub-areas corresponding to each support element, which is crucial for calculating the pressure load and determining the necessary thickness of the end plate. The user seeks clarification on how to accurately define the boundaries between these areas, particularly in complex arrangements. A detailed understanding of Figure 23 from the standard is essential for replicating the area divisions.

PREREQUISITES

Familiarity with EN 12953 boiler standards
Understanding of load distribution principles in mechanical engineering
Knowledge of pressure vessel design and calculations
Ability to interpret technical figures and diagrams

NEXT STEPS

Review the full text of EN 12953, focusing on Clause 10.2.8
Study examples of load calculations for stay tubes and bar stays
Examine Figure 23 in detail to understand area divisions
Research common practices for determining boundaries in irregular arrangements

USEFUL FOR

Mechanical engineers, boiler design professionals, and anyone involved in pressure vessel design and compliance with EN 12953 standards will benefit from this discussion.

Jun 1, 2025

Theodoros Benai

TL;DR: Trying to understand how EN 12953 defines pressure-loaded areas around stay tubes and bar stays (Figure 23). I can't replicate the area division from the standard—need a clearer explanation or example.

Hi all,

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!