Introduction

How to Use this Calculator :

Once a DR or Pressure Class has been selected following the pressure design checks, this calculator determines cyclic life of PVC pressure pipe from recurring surge pressures. This was developed based on recent fatigue research by Utah State University. Information on theory of PVC fatigue life can be found by clicking here. Click here for the PVC Forcemain Design Guide (update coming soon).

For new pipe design :

The user can perform transient modeling to determine peak recurring surge pressures and minimum recurring surge pressures. Hand calculations may be used to approximate these values; existing literature on calculating surge pressures may be used. Note, these maximum and minimum values are based on the surge envelope, not maximum and minimum pressures along the grade line. The average number of surge occurrences per day can be found from knowing pump operations or knowing pump cycle time. An example of using transient model is shown below:

For existing PVC pressure pipe :

Data from pressure monitoring, along with the average number of surge occurrences per day, can be entered to determine the remaining cyclic life.

Multiple surge magnitudes :

Some pipelines may experience multiple transient events with different surge values (ex: multiple pump operations, downstream valve operations). Whether transient analysis or pressure monitoring is performed, different surge values can be added or removed by clicking the “Add Surge Pressure” or “Remove Surge Pressure” button.

PVC Pressure Pipe Cyclic Life Calculator

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Please enter Peak Recurring Surge Pressure
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Please enter Minimum Recurring Surge Pressure
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Please input Number of Times This Occurs per Day

The calculator is in beta mode. If you have any suggestions to make it better please let me know.
Thank You!