Plastic Pipes Conference Association # 2023 Lake Buena Vista
Guido Quesada, Mark Weih
The Plastic Retainer Ring (PRR) gasket is an old friend of pipe joints, and it is still used among other sealing solutions developed more recently. With origins traced back to the end of the 1960s, it is recognized among the first solutions developed for gasketed plastic pipe joints. It is very likely to have influenced the shape of raceways. Since it requires extra room for the plastic part, the raceways in several types of joints whether rectangular (mostly for non-pressure pipe) or triangular (mostly for pressure pipe), are relatively wide, even if they no longer use a PRR. Their most distinctive advantage is the ability to hold relatively soft and flexible rubber parts in place inside a raceway in the socket before joint assembly. The PRR also provides stability during spigot insertion and helps resist seal blow-out under pressure. Given the early success of PRR, the technology available for their analysis and development, such as the nonlinear Finite Element Method (which was not extensively used for pipe joint design before 1990) was limited. With few exceptions, their prevailing designs remain relatively primitive and not very efficient in terms of assembly force, material volume and sealing performance. This has given the advantage to later seal design approaches, which offer similar advantages as PRR with manufacturing methods regarded as more efficient. However, the need for sustainability actions such as recycling materials used in the piping industry, has given the old PRR a range of opportunities to come back with new designs and advantages that were previously overlooked. One of these are the ease to separate components made of different materials and avoiding damage that could be produced by accidentally leaving the seals in plastic pipes that are recycled.
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