Sectional Point Repair: How Much Pipe Has to Be Sound?
A 300 mm crack needs a 700 mm point repair: defect plus two overlaps plus two shoulders, and why the packer must be longer than the patch.
Application Overview
The film's numbers follow the published packer-length guide: repair = defect + 2 x 150 mm overlap + 2 x 50 mm shoulder, so a 300 mm crack takes 700 mm. A 50-75 mm landing is the mechanical sleeve's figure, not the packer patch's. Confirm the model, bore and groundwater conditions with Reliance before ordering.
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.
- 010:00What a sectional point repair is
Fifty metres of sewer under a road, one crack, and a packer carrying a patch down the manhole instead of digging.
- 020:29Why a point repair is longer than the defect
The repair is the defect plus an overlap on each side plus a shoulder: the overlap is the sound pipe the patch holds on, the shoulder keeps resin off the packer's tapered ends.
- 031:04How long a repair packer has to be
The packer's flat cylindrical length must cover the whole patch: 550 and 600 mm are too short for 700 mm, so it takes RP 200-300 at 760 mm or RP 150-250 at 820 mm.
- 041:45What to measure before ordering a repair packer
Four numbers: the measured bore at the defect, the defect length and its CCTV position, the groundwater head and whether flow must continue, and the manhole opening.
- 052:10When a point repair should be a full reline instead
A point repair suits one or two defects in sound pipe; past a fifth of the reach in damage or ten percent out of round, the whole run gets lined.
Resources
Product videos
Explainer videos and short demonstrations from Reliance’s official YouTube channels. Browse every published video by topic and follow each one to its reviewed watch page or official YouTube source.
