In the case of bend in the pipeline, there is a risk that the internal membrane will be damaged by the pull cable when the UV light chain is pulled through. This can cause air to enter the composite of the lining tube and thus damage the composite.

In the presence of pressurized ground water, it can collect in low points of the pipeline (grade and alignment problems) and no longer be displaced by the pressurized air.

The maximum wall thickness of the lining tube is limited by the decreasing light transmission. Errors in the coordination between light intensity, pulling speed and wall thickness can lead to insufficient curing.