This calculator determines cyclic life of PVC pressure pipe subjected to recurring surge pressures. Its primary use is for sewer force mains. Water transmission and distribution systems typically do not have sufficient frequency and magnitude of surge pressures to require consideration of cyclic life.
The calculator is based on the Force Main Design Guide for PVC Pipe, which can be consulted for explanations of the concepts and equations used.
For a step-by-step process on how to use this calculator, see Calculator Instructions.
σamp = amplitude of pipe wall hoop stress from cyclic pressures, psi
Prs(max) = maximum pipe pressure from a recurring surge event, psi
Prs(min) = minimum pipe pressure from a recurring surge event, psi
DR = pipe dimension ratio, dimensionless = OD/t
N = number of cycles to failure
n = number of cycles per year from pump operations
This calculator was developed based on research performed by Steven Folkman, Ph.D., Utah State University, the results of which were published in the proceedings of ASCE Pipelines 2020.
If you have questions, click here to contact a PVC Pipe Association Regional Engineer.
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