The flow rate for plastic pipe should not exceed?
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It depends on a ton of variables. The schedule of the pipe, the ID, the pressure, temperature, and the type of fluid being conveyed. In general, I'd say not to exceed the working pressure of the pipe. If you need a higher flow rate, go to a larger diameter pipe.
Plastic pipe is only rated for static (burst) pressure and working pressure within a specified temperature range, not flow rate. Since there is friction between the walls of a pipe and the fluid flowing in it, if one has a very long, open-ended pipe, one could theoretically reach or exceed the rated pressure of the pipe at the pumping end with maximum unrestricted flow. If one could calculate these values, it would give the maximum flow rate that should not be exceeded. However, since fluids have mass, suddenly closing the discharge end of the pipe could result in transient pressures that exceed the burst pressure of the pipe.
