Cured-in-place piping application for structural and pressure boundary integrity

摘要

The use of insitu methods to rehabilitate buried or inaccessible piping systems is an emerging technology which has received recognition as an ASME XI Code approved alternate to traditional repair practices. This type repair requires the insertion of a carrier tube, containing thermosetting resins and reinforcement fillers into the host pipe. The length of the carrier tube is only limited by the pot life of the resin and restrictions of piping geometry. Once the insertion is completed, the resin is cured using hot water, air or steam, which is circulated through the host pipe. After curing, the resultant product is a form-fitted structurally reinforced resin pipe within the existing host piping. The Cured-In-Place Pipe (CIPP) has mechanical properties similar to those of fiberglass piping. The savings of this type repair, in both system downtime and replacement cost, is substantial. This methodology provides utilities with a technically sound, economically fasible soution to buried piping repairs and the ASME Section XI Code Case N-589 provides the requirements for materials, design and installation.