Combining Models to Simulate the Condition of the PVC Distribution Network

Abstract

Abstract:The failure of joints plays an important role in the overall performance of mains. One of the prevalent failure modes at polyvinyl chloride (PVC) joints is the rupture of pipe or joint, which may occur due to high angular deflection of the pipe with respect to the joint, caused by differential soil settlement. The present paper reports the construction and use of a finite element model to determine the maximum angular deflection of a variety of PVC joints in different loading situations. The resulting acceptable deflections vary between 3° and 8° per side, which differs significantly from installation guidelines. The results will support drinking water companies in substantiating the prioritization of maintenance and inspection.

Prediction of Pipe Failure in Drinking Water Distribution Networks by Comsima

“…Possibly other failure mechanisms, and the complex interaction between joint and failure may explain these deviations. Finite element modelling (FEM) is therefore conducted [12], which results in allowable joint rotations that could be included in Comsima.…”

“…Several improvements are being developed to further increase the accuracy of the predictions of Comsima. Amongst them are improvements of pipe degradation mechanism and the inclusion of more advanced modelling techniques, such as FEM (finite-element models) to determine allowable PVC joint rotations [12]. Data from inspection techniques could also help to improve degradation models.…”