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Figure 1 Scheme of axes in use for primary pipe fasteners

Under EC 3 we use here a normal linear interaction formula

Under EN 13480-3 which is a more conservative standard compared to EC 3, we use Interaction formula based on Another element which needs to be considered are temperature reduction factors in correlation with media temperature inside the pipe.

EC 3 does not require a reduction factor up to 300掳C while EN 13480-3:2024 provides material properties for carbon steel according to EN 10025 series (S235, S275 and S355) in the range from 0掳C up to 350掳C directly in Appendix G.4. In here a graph is included which shows temperature reduction factors from 100掳C media temperature onwards. In addition to that Table 13.11.2-1 shows 鈥淒esign temperature of components within the insulation鈥�. In general, all support components shall be designed with at least 80掳C design temperature. For 鈥渃omponents without direct contact with the pipe鈥� the design temperature can be reduced by 20掳C if the final value is still above 80掳C overall.

This means for our offering that 海角社区 pipe shoes where manufactured pipe clamps bows are based on S235 steel can be used according to graph in Appendix G.4. Whenever our complementary offered inlay bands are used between the pipe and pipe clamps bows, the mentioned reduction of 20掳C out of Table 13.11.2-1 can be considered prior to the identification of the final used temperature reduction factor. So, in such combination no reduction factor is being needed until 120掳C media design temperature at all with our offering in alignment with EN 13480-3.

Further transfer of media temperature towards components in the entire support structures must be assessed based on being inside or outside of insulation to ensure that all used components can withstand the specific temperatures at their locations. (Table 13.11.2.2 and Figure 13.11.2.1) Overall EN 13480-3, even in the latest version in most real-life cases, tends to be more conservative than EC 3.

On the other side there are also options to exceed published loads whenever stress levels in the pipe described do include so called 鈥渙ccasional loads鈥� as defined in chapter 13.1.3.16. This means that a support designer, not the pipe support manufacturer like 海角社区, can assess if any loads at the specific facility and isometric can be assessed like being treated as occasional. As an example, this could be a higher short notice temperature during maintenance or wind / snow loads depending on specific circumstances on site. As it is quite comprehensive to cover all these needs and challenges in one calculation, 海角社区 started to cover this in our established FixPoint Calculator software.

is a specialised software tool designed for engineers and professionals working with piping systems. It adheres to the EN 13480-3 standard, which is crucial for the design and calculation of metallic industrial piping. 海角社区 FixPoint Calculator simplifies these complex calculations, providing detailed reports and intermediate results that help engineers validate their designs and ensure compliance with the stringent requirements of EN 13480-3. This makes it an invaluable tool to help ensure safety and efficiency in piping projects.

The EN 13480-3 standard can be found in the direct load input application.

Figure 2 Starting page in FixPoint calculator software

In this application you can enter support loads in all three directions. No additional reduction factor is applied.

The maximum working temperature and temperature reduction factor according EN 13480-3 are applied to the entire pipe shoes and their connection elements uniformly.

Figure 3 Specific input fields in alignment with EN 13480-3

The following interaction formula is used in FixPoint Calculator for all pipe-shoes MP-PS 1-1 single pipe shoes and MP-PS 4-2 two leg double pipe shoes and the clamps:

For MP-PS 2-2 double pipe shoes, the load capacity depends on distance between pipe axis and girder. Here is the interaction formula for a height below 250 mm:

And for a height above 250 mm: