Determining the ring stiffness of pipes

Testing the ring stiffness is an essential part of quality control for pipes used for drinking water and wastewater systems as well as irrigation and drainage systems. As these pipes are exposed to high mechanical loads during installation and use, it is crucial to accurately determine their resistance to pressure.

What is ring stiffness?

Ring stiffness describes the resistance of a pipe to deformation caused by a vertically applied force. It is measured by determining the force and deformation at a constant test speed in accordance with DIN EN ISO 9969.

Further characteristic values for plastic pipes

In addition to ring stiffness, apex pressure testing machines can also be used to determine other mechanical parameters:

• Ring flexibility - testing the elastic deformability of the pipe
• Minimum compressive strength - resistance to a defined compressive load
• Crest compressive strength - load capacity of the pipe crest against external pressure

Flexible testing options for different pipe sizes

Pipe sections of different sizes are tested depending on the underlying standard and application. The testing machines can be adapted to different pipe diameters and wall thicknesses in order to simulate realistic load scenarios.

Conclusion

These test methods on apex pressure testing machines ensure that the pipes can withstand the high demands of practical use and that long-term functional reliability is guaranteed.

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