Within the host pipe, a stationary winding head is used to wind specialized PVC profile strips into a liner with a diameter that is initially smaller than that of the original pipe. A stainless steel wire is pre-embedded within the locking mechanism (interlock). Once the winding process is complete, the steel wire is pulled from inside the pipe to cut the temporary lock. The resulting inherent spiral expansion stress then forces the pipe to expand until it fits tightly against the inner wall of the host pipe. Suitable for the rehabilitation of circular pipelines with a diameter range of DN300–DN600mm. This rehabilitation method does not require any grouting treatment.

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