DETERMINATION OF RING STIFFNESS
(TS EN ISO 9969)

A test where the performance of plastic pipes against external loads is determined. At the same time, it determines how many meters can be buried under the soil. The pipe is subjected to 3% internal diameter deformation at a specific speed. The SN (Nominal Stiffness) value is found in units of kN / m2 in the formulas specified in the standards using parameters such as applied force value, sample length.