fischer Installation Systems Main Catalog Pagina 471
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Basics Elongation Materials expand with heat. For long components, the change in length is mainly considered. So it is not always a matter of expansion. Shrinkage upon cooling is to also be included in the calculation. This is important when installing pipes. Within piping, the change in length is to be specifically steered. Not doing this during installation results not only in pipe defects, but also in serious damage to components. It is therefore essential to determine how great the change in the length of a pipe can be. MT 0,024 [mm/mK] For this purpose, the pipe length and the expansion coefficient of the pipe material, as well as the expected temperature difference, must be known. This is to be determined such that not only the normal operating temperatures, but also the maximum temperatures that can arise in a case of malfunction, are taken into account. The range is therefore from around 10 °C assembly temperature up to 95 °C service temperature for water filled systems. 10 m 20 m 30 m 40 m 12 50 m PE 0,2 [mm/mK] 60 m 70 m PP 0,15 [mm/mK] 80 m MT Cu 0,0165 [mm/mK] PE Fe 0,0115 [mm/mK] PP 90 m Cu 100 m Fe PVC 0,08 [mm/mK] Example 1 Example 2 PVC Temperature difference D ∆ T [K] Length expansion ∆ L [mm] 100 90 80 70 60 50 40 30 20 10 10 20 30 40 50 60 70 80 90 100 Note: For plastic pipes (PE, PP, PVC), the length expansionread from the diagram is to be multiplied by a factor of 10. Copper pipe, Cu – Length of pipe span 30 m Temperature difference ΔT = 50 K Length expansion Δ L= 24,75 mm PVC pipe – Length of pipe span L = 40 m Temperature difference Δ T = 40 K Length expansion Δ L = 128 mm (table value x 10) Length expansion calculation formula ΔL = L × ΔT × α [mm] [m] [K] [mm/m K] Δ L=Change in length L= Length of the pipe span/section Δ T = Temperature difference α = Length expansion coefficient 471
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