Technical FAQs

What is the maximum flow velocity of PVC pipe?

Common engineering practice suggests a maximum flow velocity of 5 ft./s during normal (steady state) operating conditions for pressure pipe application. During surge conditions the recommended maximum allowable flow rate is 10 ft./s. 

Exceeding the recommended maximum flow velocity, for an extended period of time, could result in excessive internal pressures in the PVC pipe system, possibly leading to a joint or pipe wall failure.

For gravity sewer lines, which are not pressurized, the recommended maximum flow velocity is 10 ft./s before special considerations need to be taken for energy dissipation and internal erosion prevention.


Source: PVC Pipe Association: Handbook for PVC Pipe Design and Construction, 5th Ed.