Internal Pressure Design Calculator for PVC


Ningbo Fangli Technology Co., Ltd. is a mechanical equipment manufacturer with nearly 30 years’ experiences of plastic pipe extrusion equipment, new environmental protection and new materials equipment. Since its establishment Fangli has been developed based on user’s demands. Through continuous improvement, independent R&D on the core technology and digestion & absorption of advanced technology and other means, we have developed PVC pipe extrusion line, PP-R pipe extrusion line, PE water supply / gas pipe extrusion line, which was recommended by the Chinese Ministry of Construction to replace imported products. We have gained the title of “First-class Brand in Zhejiang Province”.



Author: John Houle 

The PVC Pipe Association has released the "Internal Pressure Design Calculator for PVC Pipe," which assists users in the design of PVC pipe for various pressure limit states.

The methodology follows the latest version of AWWA C900 "Polyvinyl Chloride (PVC) Pressure Pipe and Fabricated Fittings, 4 In. Through 60 In." as well as the Handbook of PVC Pipe Design and Construction (5th Edition). The user simply inputs pipe size, outside diameter (OD) regimen and operating temperature. Pressure inputs include working pressure, occasional surge pressure (also known as "emergency surge"), recurring surge and field hydrostatic test pressure.

The calculator output is the pipe's actual OD dimension, required dimension ratio (DR) and required pressure class/rating. Note that this calculator only checks PVC pressure pipe capacity for these limit states. It does not check for design life from recurring (cyclic) surge pressures. An upcoming cyclic calculator will address this topic.

Click here for calculator.

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