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High Purity Water Piping Guide
The following guide, developed by Nancrede Engineering Company, is a series of piping recommendations for corresponding water treatment applications as well as the maximum temperatures that the piping can accommodate. It is also very important that high purity water pipe fitting joints must not utilize chemical (solvent) bonding techniques or threads for assembly. Fitting joints must be accomplished with a heat based process.
Due to the manipulation of ions, treated water can sometimes become ‘aggressive’ and corrode some kinds of piping. Therefore, when utilizing a water treatment system, it is important to consider the piping that will be used for water’s transport.
| Water Treatment System | Acceptable Piping |
| Particle Filtration | Most piping can be used |
| Microfiltration | Most piping can be used, but avoid copper piping |
| Ultrafiltration | PVC, CPVC, PP, PVDF, 304 or 316 stainless steel |
| Nanofiltration | PVC, CPVC, PP, PVDF, 304 or 316 stainless steel |
| Reverse Osmosis Filtration | PVC, CPVC, PP, PVDF, 304 or 316 stainless steel |
| Mixed Bed Deionization | PVDF, Virgin PP (PVC, CPVC not recommended) |
PP = Polypropylene PVC = Polyvinyl chloride type 1, grade 1 CPVC = Chlorinated Polyvinyl Chloride PVDF = Polyvinylidene Fluoride
Maximum Temperatures for Polymer-Based Piping
| Pipe Type: | PP | PVC | CPVC | PVDF |
| Temperature (‘F): | 180′ | 140′ | 185′ | 250′ |
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