Failures of sewer pipes made of PVC

This paper presents the field measurements results of sewer pipes made of PVC, which were newly laid in the ground. The research was carried out applying CCTV (Closed Circuit Television) inspections, which was performed during the construction works acceptance of the sewer pipes some weeks or months after their laying in the ground. More than 11 km of sewers from 11 cities in Poland were analyzed. The analysis was carried out based on the research conducted among other things by Kielce University of Technology. A detailed analysis of specific flexible pipes failures was carried out. Failures, which occurred most frequently and on the highest percentage of the sewer pipe lengths were identified. The failures were classified according to the intensity of their occurrence and caused danger. Class 1 covers the greatest failures and the highest level of danger, class 5 covers minor failures with the lower level of danger. The technical condition of the investigated sewers was assessed by classifying the particular sections to one of 3 groups: G 1 – without failures, G 2 – with failures in 5th class, G 3 – with failures in classes 1st- 4th. The most probable reasons for failures were presented.