Fracture analysis of defect Chlorinated Poly Vinyl Chloride pipes based on burst pressure and prediction their fraction of life

Abstract

Most Chlorinated Poly Vinyl Chloride (CPVC) resins contain 63-69 % chlorine, in particular those used for the extrusion of plumbing tubes, due to this chlorination of basic PVC, CPVC offers a mixture of corrosion resistance and low installation costs for its main applications requiring service in non-ambient conditions. CPVC replaces copper owing to its economic gain and by virtue of its pressure resistance characteristics. In this article, we have been interested in fracture analysis and damage modeling of CPVC tubes by subject CPVC samples to burst pressure tests. We performed a set of burst tests on virgin and artificially damaged CPVC pipe at different notch lengths, then submitted the specimens to burst pressure tests, in addition to recording the pressure and time during these tests for use in conducting the study. The results of the burst tests were exploited to estimate the damage and reliability of the material, these two parameters allow us to follow the degradation of the pipes used; subsequently, we determined a new relationship between these two parameters through the fraction life. This makes it possible to predict the moment of damage acceleration and to intervene at the right time for engaging predictive maintenance.

Study of defects influence on chlorinated polyvinyl chloride pipes damage and analysis of their fracture

“…The CPVC pipes under investigation will be damaged, and this will be determined by the tests that follow. To do that, we have been chosen the specimens according to ASTM D1599 standard test for short-term hydraulic pressure resistance of fittings, plastic pipes and hoses [17]; this code requires a known specimen with calculated length and known exterior diameter and thickness. We prepared 21-notched specimens.…”

“…Like metallic structures [16], thermoplastic ones, especially pipes were studied. The materials' faults reduce the reliability of the installations and shorten their lifespan [17]. While, the ASTM D 2837 [18] gives 11 years and the ISO 9080 [19] standard gives a stress-time extrapolation line of 50 years, failures can provide serious accidents in pressurized piping systems, as burst, leaks or ruptures.…”

Predicting the lifetime of CPVC under increasing temperature and crosshead speed

“…Fig. 11 demonstrates the evolution of experimental damage based on ultimate stress in function according to life fraction β [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29].…”

“…The authors discussed the types of defects that can occur in CPVC pipes and the effects that these defects can have on their fracture properties. They also examined how burst pressure affects the fracture properties of CPVC pipes and the fraction of life that these pipes can be expected to survive [17]. Khtibari et al examined the effect of strain rate on the damage of CVPC compound at room temperature.…”