Trenchless pipe repair: re-round the pipe first

Chapters

Each chapter opens the video at that point on YouTube. Read the script under each chapter. From the subtitle track delivered with the video. Refer to the video and product documentation for technical details.

1. 010:00Why a deformed sewer pipe cannot take a repair sleeve

   Trenchless pipe repair starts with the shape of the pipe. A squashed sewer is not ready for a sleeve. This DN300 sewer is pressed down to 130 millimetres. A repair sleeve is a rigid ring. It has to land on the wall all the way round. On this bore it stands off the crown, and the repair never seats. Under the road, the camera finds the section pressed out of round. That is the first thing the survey has to record. Send us the survey and the measured bore, and we will size the jack and the repair around it.

2. 020:28How a point-repair jack re-rounds a deformed pipe

   The point-repair jack goes in before the repair, not instead of it. Two hydraulic rams press the crown back up. The published lift is 80 millimetres. It holds the shape while the wall is still supported. Where the section is tighter, the duck-billed jack wedges in. Its two shells open apart: DHJ 300 goes from 130 millimetres to 310. Two configurations cover the range. The up-down jack is published from DN150 to DN600. The duck-billed jack, DHJ 300, 400 and 500, covers DN300 to DN500.

3. 031:08How a repair sleeve seats after re-rounding

   Once the bore is round again, the repair goes in from the manhole. A packer carries a resin-and-fiberglass patch to the section. It inflates and presses the patch onto the wall, and holds it while the resin cures. The packer comes out. The patch stays, and the street never closed. Back at the same section: the bore is round. Now the sleeve lands on the wall all the way round. That is what the jack buys: a repair that can seat. The sleeve that goes in is stainless steel with an EPDM jacket. The packer opens it, a toothed strip locks it, and the jacket seals on the wall. Published for DN150 to DN600, with a 400 millimetre rubber width.

4. 041:51When re-rounding is not the answer

   Re-rounding is not always the answer. Above ten percent ovality, a sectional repair is not the route: the run gets a full-length liner or pipe bursting. And a rigid sleeve above three percent ovality gives way to a CIPP patch, which conforms to the profile. The survey decides which of those you are in. So send four things with the enquiry. The measured bore at the defect, and the pipe material: HDPE, PVC, glass sand-filled or steel-belt. The CCTV record with the defect location and the access opening the jack has to pass. And whether the pipe is concrete or PE, because Reliance confirms those before the model is fixed.