If using GRP/FRP pipe for trunk watermains in questionable soils, I would want to restrain all bends using the manufacturer's joint restraint system. Flowtite has a restrained joint design which requires a nylon shear rod to be inserted into slots machined into the joint coupling and pipe.
1...
I am looking into FRP/GRP pipe for a trunk watermain (about 1000mm diam) in clayey soils, which sometimes slip or slide over time.
1. How might this pipe and its joints react if movement causes the originally well compacted trench backfill to loosen?
2. How does FRP/GRP pipe break or fail? Can...