New experimental results obtained from a high density polyethylene (HDPE) pipeline for transient conditions are presented and discussed. Pressure data in different cross sections were collected. Peculiar features were observed, which are typical of viscoelastic pipes. In particular a significant damping of extreme pressures in comparison to what is currently obtained for metal pipes. Physical constrains of pipe are important to describe some vibrations observed in the system. Additionally, a viscoelastic transient solver developed by Covas et al. (2005) was used to carry out numerical simulations of experimental tests. The comparison of numerical results with experimental data has shown that the viscoelastic model accurately predicts observed transient pressures as well as it reasonably describes. Additional considerations are carried out about the calibrated creep function for this test case in comparison with the ones obtained in previous analyses.
Creep Functions for transients in HDPE pipes.
DE MARINIS, Giovanni;LEOPARDI, Angelo;
2014-01-01
Abstract
New experimental results obtained from a high density polyethylene (HDPE) pipeline for transient conditions are presented and discussed. Pressure data in different cross sections were collected. Peculiar features were observed, which are typical of viscoelastic pipes. In particular a significant damping of extreme pressures in comparison to what is currently obtained for metal pipes. Physical constrains of pipe are important to describe some vibrations observed in the system. Additionally, a viscoelastic transient solver developed by Covas et al. (2005) was used to carry out numerical simulations of experimental tests. The comparison of numerical results with experimental data has shown that the viscoelastic model accurately predicts observed transient pressures as well as it reasonably describes. Additional considerations are carried out about the calibrated creep function for this test case in comparison with the ones obtained in previous analyses.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
