Ring stiffness
Ring stiffness is a measure of the deformation of pipes under radial pressure load .
The nominal ring stiffness is determined in accordance with DIN EN ISO 9969 by loading a pipe from the side until it deforms by 3%.
Tested pipes are assigned a ring stiffness class, which is designated with SN and a numerical value. "SN" stands for the English term "stiffness number".
The specified standard category SN 2 is fulfilled if the measured load capacity was 2 kN / m² or greater - correspondingly for SN 4, SN 8 and SN 16.
In contrast, DIN 16961 Part 2 describes the determination of the ring stiffness SR24 and the assignment to the profile tube series 0 to 7.
Individual evidence
- ↑ Explanation of the ring stiffness classes on the website of the Association of the Plastic Pipe Industry (KRV)
- ↑ Explanation of the ring stiffness SR24 on the website of the Association of the Plastic Pipe Industry (KRV)