The issue of negative pressure resistance in pressure pipelines
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The pump is connected to the overacidic composite pipe, and a negative pressure of -60 kp is applied. Why does the pipe collapse as soon as the pump starts? The experimental data from both sides show that there are no issues. I would appreciate it if someone with expertise could explain what’s going on here
Pressure pipes are not designed to withstand negative pressure; if there is a need for such capability, it must be specified explicitly, and engineers need to carry out calculations – otherwise, the pipes are likely to collapse. Just like a plastic Coke bottle you buy – if you take a breath through it, it collapses.
The deviation between the theoretical and actual values in the strength calculation of composite pipes is related to multiple factors.