Failure Analysis on Pressure Leakage of FRP
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Keywords:
Leakage (economics)
Internal pressure
Hydrostatic test
Discontinuity (linguistics)
Internal pressure
Hydrostatic test
Hydrostatic pressure
Internal stress
Stress–strain curve
Hydrostatic equilibrium
Hydrostatic stress
Strain (injury)
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Repair of cracked pipeline under internal pressure (IP) was investigated in the current work. To such aim, the test the experiment has been done on the cracked pipeline to find failure pressure (FP). A longitudinal crack that cut 65% thickness of pipe has been applied on the external surface. The reinforced polymer C fibre has been utilized for repairing the system. Additionally, a model of finite element has been established to estimate the unrepaired pipes FP. The results show that the FP in unrepaired pipes is identical to the FP predicted by the standards for corroded pipes; however, the FP of repaired system is lower than the predicted results of standard for corroded pipelines.
Internal pressure
Hydrostatic test
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Internal pressure
Hydrostatic test
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Discontinuity (linguistics)
Classification of discontinuities
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Discontinuity (linguistics)
Classification of discontinuities
Metal forming
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Small leaks in water supply networks often remain undiscovered, resulting in large amounts of lost water. Moreover, small leaks can grow larger over time and may result in pipe bursts, having negative consequences for the surroundings. An automatic leak localization method is required to decrease the search area and hence localize small leaks earlier. In this research, the automatic leak localization method of Quevedo et al. (2011) is validated in DMA Leimuiden (the Netherlands). A prerequisite of the localization method is a detailed consumption distribution of the inflow for the hydraulic model. The goal of this research is to study the need for a detailed consumption distribution model in a DMA with a small MNF compared to the leak size (MNF: 4.5 m3/h, leak size: 5.2 m3/h, 7.5 m3/h and 15 m3/h). The leak localization method was applied to eight artificial leaks that lasted 15 minutes and measurements of one day of a real leak (5.2 m3/h). Leak localization results of the artificial leaks showed that there was no influence of the consumption distribution during the night. The leak localization method performs the same with both consumption models in case of low flow conditions and when leak localization results of the real leak for a whole day are combined. The performance of the leak localization method depends on the location of the leak. For some leak locations more flow in the system is required to create detectable head loss at the sensor locations. Uncertainties in the model cause larger pressure variations with higher flow conditions and a more detailed consumption distribution model must be used when there is more flow (morning peak). Too short measurement periods make the leak localization result sensitive to unexpected consumption inside the DMA. An accumulation of hourly results of a whole day makes the method more robust and gave satisfying performance irrespective of the used consumption models and with only 6 pressure sensors inside the network.
Leak Detection
Inflow
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In this paper, the ultimate hoop strength of an industrial (±55 deg)9 filament-wound glass-reinforced epoxy (GRE) pipe as a short-term test is determined according to the ASTM D-1599 standard by performing the internal hydrostatic pressure test. After the test, the failure surface of the pipe is photographed by a high magnification camera, and in addition, the explanations are presented about the type of failure. The main purpose of this study is to compare the results obtained for the ultimate hoop strength and failure mechanisms of the pipe by using the internal hydrostatic pressure test with that by the split disk test method according to the ASTM D-2290 standard in the previous work.
Hydrostatic test
Internal pressure
Hydrostatic pressure
Hydrostatic equilibrium
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Internal pressure
Hydrostatic test
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Hydrostatic test
Internal pressure
Hydrostatic pressure
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Polyolefin
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Hydrostatic test
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