PPI Technical Notes

TN-4 - Odorants in Plastic Fuel Gas Distribution Systems
TN-6 - Polyethylene Coil Dimensions
TN-7 - Nature of Hydrostatic Stress Rupture Curves
TN-11 - Suggested Temperature Limits for the Operation and Installation of Thermoplastic Piping in Non-Pressure Application
TN-13 - General Guidelines for Butt, Saddle and Socket Fusion of Unlike Polyethylene Pipes and Fittings - Archived - Consult ASTM D2513, ASTM F2620 and PPI TN-73
TN-14 - Utilizing Plastic Piping in Solar Thermal Heating Systems - revised 2025
TN-15 - Resistance of Solid Wall Polyethylene Pipe to a Sanitary Sewage Environment Document under review and unavailable. Contact PPI staff with questions.
TN-16 - Rate Process Method for Projecting Performance of Polyethylene Piping Components
TN-17 - Crosslinked Polyethylene (PEX) Pipe & Tubing
TN-19 - Pipe Stiffness for Buried Gravity Flow Pipes Document - Archived - Consult PPI Drainage Handbook, Chapter 7
TN-20 - Special Precautions for Fusing Saddle Fittings to Live PE Fuel Gas Mains Pressurized on the Basis of a 0.40 Design Factor
TN-21 - PPI PENT Test Investigation - revised 2025
TN-22 - PPI Guidelines for Qualification Testing of Mechanical Couplings for PE Pipes in Pressurized Water or Sewer Service - Archived
TN-23 - Guidelines for Establishing the Pressure Rating for Multilayer and Coextruded Plastic Pipes - Archived
TN-26 - Erosion Study on Brass Insert Fittings used in Crosslinked Polyethylene (PEX) Piping Systems - revised 2026
TN-27 - Frequently Asked Questions: HDPE Pipe for Water Distribution and Transmission Applications - Archived
TN-28 - Guide to Differences in Pressure Rating PE Water Pipe between the ASTM and ISO Methods
TN-30 - Requirements for the Use of Rework Materials in Manufacturing of Polyethylene Gas Pipe
TN-31 - Differences Between PEX and PB Piping Systems for Potable Water Applications
TN-32 - UV Labeling Guidelines for Crosslinked Polyethylene (PEX) Tubing and Pipes - revised 2025
TN-34 - Installation Guidelines for Electrofusion Couplings 14" and Larger - Archived - Consult MAB-02
MAB-02 - MAB Generic Electrofusion Procedure for Field Joining of 14 Inch to 30 Inch Polyethylene (PE) Pipe
TN-35 - General Guidelines Repairing Buried HDPE Potable Water Pressure Pipes - Archived - Consult PPI Handbook of Polyethylene Pipe, Chapter 15
TN-36 - General Guidelines for Connecting HDPE Potable Water Pressure Pipes to DI and PVC Piping Systems - Archived - Consult PPI Handbook of Polyethylene Pipe, Chapter 9
TN-37 - Standard Practice for Installation of Annular Corrugated Profile Wall Polyethylene Pipe for Agricultural Drainage or Water Table Control - revised 2025
TN-38 - Polyethylene Flanged Joints
TN-39 - Recommended Practices Regarding Application of Pesticides and Termiticides near PEX Pipes
TN-42 Recommended Minimum Training Guidelines for PE Pipe Butt Fusion Joining Operators for Municipal and Industrial Projects - Archived - has been superseded by ASTM F3190
TN-43 - PE Compound Categorization for Potable Water Applications
TN-44 - Long Term Resistance of AWWA C906 Polyethylene (PE) Pipe to Potable Water Disinfectants
TN-45 - Mechanical Couplings for Joining Polyethylene Pipe
TN-46 a - Hydrostatic Universal Field Test Procedure
TN-47 - Polyethylene Resin Testing Requirements to Support ASTM D2513 UV Exposure Limits of Polyethylene Compound
TN-48 - Guidelines for Choosing Wall Thickness for HDPE Conduit Based on "Mini-HDD" (Horizontal Directional Drilling)
TN-49 - Recommendations for AWWA C901 Service Tubes in Potable Water Applications
TN-50 - Guide to Specifying HDPE Conduit - revised 2025
TN-51 - Polyethylene Pipe Butt Fusion Structure, Process, & Terminology - revised 2026
TN-52 - Guide to High-Temperature Applications of Non-Potable PEX Pipe and Tubing Systems
TN-53 - Guide to Chlorine Resistance Ratings of PEX Pipes and Tubing for Potable Water Applications - revised 2025
TN-54 - General Guidelines for Squeezing Off Polyethylene Pipe in Water, Oil and Gas Applications - revised 2025
TN-55 - Plastic Piping Materials for Geo Applications
TN-56 - Installation of Plastic Pressure Piping Materials Near IC-Rated and Non-IC-Rated Recessed Lighting Fixtures - revised 2025
TN-57 - Proper Integration of PP-R Piping Materials with Copper Tubing and Components for Plumbing Applications - revised 2025
TN-58 - HDPE Conduit and Duct Handling Guide - revised 2025
TN-59 - Comparison of HDPE Conduit and Fabric Divider Installed as Innerduct
TN-60 - Inspection of Plastic Pipes, Fittings and Joints Using Non-Destructive Test Methods and Evaluation
TN-61 - Coilable HDPE Conduit Ovality and Coil-Set
TN-62 - Suitability and Fitness of Chlorinated Polyvinyl Chloride (CPVC) Piping Systems for Commercial Building Applications - revised 2026
TN-63 - Safe Pull Strength Calculations for Conduit
TN-65 - Insulation Recommendations for Plastic Pressure Piping Materials in Residential Applications
TN-66 - The Development and Evolution of PPI TR-33 - Generic Butt Fusion Joining Procedure for Field Joining of Polyethylene Pipe
TN-67 - Chlorine Dioxide and Plastic Hot- and Cold-Water Plumbing Distribution Pipes
TN-68 - Historical Review of the PE 100-RC Concept - How PE4710 Compares to PE 100-RC
TN-69 - Recommendations When Applying Spray Polyurethane Foam Insulation On and Around Plastic Pressure Pipes & Fittings
TN-70 - HDPE Conduit Joining Guidelines
TN-71 - Flanges and Flange Adapters for Polypropylene (PP-R and PP-RCT) Piping Systems
TN-72 - Potential Effects of Artificial Lighting on Crosslinked Polyethylene (PEX) Pipe and Tubing and Recommended Installation Practices
TN-73 - Fusion Qualification Requirements for Polyethylene Natural Gas Distribution Pressure Pipes and Fittings - new 2025