Does angular deflection at joints affect leak tightness?
It has been proven that joints with up to 2 degrees deflection retain leak tightness.
- Normally the sockets allow a certain free angular deflection of the inserted pipe/spigot. The real free angle of deflection depends on the particular design.
- The European standards for both solid wall and structured wall sewer pipes require pipe joints to maintain their integrity when the pipe is deflected through a further 2 degrees relative to the joint in addition to the free angle.
- Under these test conditions the pipe joint must maintain leak tightness under a water pressure of 0.5 bar and a negative air pressure of -0.3 bar.
- This test is designed to demonstrate that even when misaligned pipes will not allow exfiltration of effluent or infiltration of ground water if the sewer is located below the level of the ground water table.
- Plastics sewer pipes can also be jointed using fusion techniques. Joints formed in this way perform at least as well as ring seal joints.
Want to know more?
Refer to the European Standard EN 1277 for the full test method and manufacturers documentation regarding the free angle of deflection.
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