Guide Helps Avoid Conduit Damage


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”.


US-based Plastics Pipe Institute (PPI) says that a new guide will help installers to calculate safe pulling loads – and avoid damaging HDPE conduit.

The technical note, TN-63, provides the equations needed to calculate the Safe Pull Strength

(SPS) for HDPE conduit, plus tables of pre-calculated SPS values for typical HDPE conduit wall diameters and thickness types. It also includes guidance on how to derate the SPS for elevated temperature installation and time-under-tension considerations.

“When pulling HDPE conduit into place, an increasing axial tensile load will be exerted on the conduit,” said Patrick Vibien, director of engineering for PPI’s power & communications division. “If the SPS is exceeded during installation, the conduit may permanently deform at some location along its length.”

TN-63 can be downloaded free from PPI’s website.

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