Technical Reports

• TR-2 2024 - PPI PVC Range Composition Listing of Qualified Ingredients
• TR-2 2023 - Superseded by 2024
• TR-2 2021 - Superseded by 2024
• TR-2 2020 - Superseded by 2024
• TR-3 2024 - HDB/HDS/PDB/SDB/MRS/CRS Policies
• TR-3 2023 - Superseded by 2024
• TR-3 2021 - Superseded by 2024
• TR-3 2020 - Superseded by 2024
• TR-4 2024 - PPI Listing of Hydrostatic Design Basis (HDB), Strength Design Basis (SDB), Pressure Design Basis (PDB) and Minimum Required Strength (MRS) Ratings for Thermoplastic Piping Materials or Pipe
• TR-4 2021 - Superseded by 2024
• TR-4 2020 - Superseded by 2024
• TR-4 2019 - Superseded by 2024
• TR-5 - A listing of standards for the various types of plastics piping are promulgated by numerous standards-making organizations - Archived
• TR-7 - Method For Calculating An Estimated Weight-Per-Foot of Solid-Wall Plastic Pipe
• TR-9 - Recommended Design Factors for Pressure Applications of Thermoplastic Pipe Materials - revised 2025
• TR-11 - Resistance of Thermoplastic Piping Materials To Micro- And Macro-Biological Attack 
• TR-14 - Water Flow Characteristics of Thermoplastic Pipe - Archived
• TR-18 - Weatherability of Thermoplastic Piping Systems
• TR-19 - Chemical Resistance of Plastic Piping Materials
• TR-21 - Thermal Contraction and Expansion in Plastics Piping Systems - Archived - Consult the PPI PE Pipe Handbook newly revised Chapter 7: Underground Installations; for Above-Ground Applications, refer to Chapter 8
• TR-22 - Polyethylene Plastic Piping Distribution Systems for Components of Liquid Petroleum Gases 
• TR-30 - Investigation of Temperatures Attained by Plastic Fuel Gas Pipe Inside Service Risers
• TR-31 - Underground Installation of Polyethylene Piping - Archived - Consult the PPI PE Pipe Handbook. Installation guidance is in Chapter 7 and hydrostatic testing procedures are in Chapter 2
• TR-33 - Generic Butt Fusion Joining Procedure for Field Joining of Polyethylene Pipe - Consult PPI TN-66 for summary of testing
• TR-34 - Effects of Disinfection of Newly Constructed Polyethylene Water Mains
• TR-35 - Chemical & Abrasion Resistance of Corrugated Polyethylene Pipe - Archived - Consult PPI Drainage Handbook, Chapters 2, 4 and 8
• TR-36 - Hydraulic Considerations for Corrugated Polyethylene Pipe - Archived - Consult PPI Drainage Handbook, Chapters 5 & 6
• TR-37 - Drainage Division Standard Specification (100-97) for Corrugated Polyethylene (PE) Pipe for Storm Sewer Applications - Archived
• TR-38 - Structural Design Method for Corrugated Polyethylene Pipe - Drainage Division Guide - Archived - Consult PPI Drainage Handbook, Chapter 7
• TR-39 - Structural Integrity of Non-Pressure Corrugated Polyethylene Pipe - Archived - Consult PPI Drainage Handbook, Chapters 7, 8 and 10
• TR-40 - Evaluation of Fire Risk Related to Corrugated Polyethylene Pipe - Archived
• TR-41 - Generic Saddle Fusion Joining Procedure for Polyethylene Gas Piping
• TR-42 - Agriculture and Drainage - Archived.
• TR-43 - Design Service Life of Corrugated HDPE Pipe - Archived - Consult PPI Drainage Handbook, Chapter 8
• TR-44 - Comparison of Traditional HDPE Innerduct and "Fabric Conduit" Alternative - Archived - Consult TN-59 - Comparison of HDPE Conduit and Fabric Divider Installed as Innerduct.
• TR-45 - Butt Fusion Joining Procedures for Field Joining of Polyamide-11
• TR-46 - Guidelines for Use of Mini-Horizontal Directional Drilling for Placement of High Density Polyethylene Pipe - Archived - Consult  MAB-7 for municipal water applications or to TN-48 for conduit
• TR-47 - Pipe Stiffness and Deflection Testing of Coilable HDPE Conduit as Related to Burial Depth - Revised 2025 
• TR-48 - R-Value and Thermal Conductivity of PEX and PE-RT - Revised 2025
• TR-49 - Generic Electrofusion User Guide for Field Joining of Polyethylene Gas Piping
• TR-50 - Generic Butt Fusion Joining Procedures for PA12
• TR-51 - Investigation of Benzene in Drinking Water Following the "Camp Fire" in Paradise, CA
• TR-52 - Resistance of PEX Pipe and Tubing to Breakage When Frozen (Freeze-Break Resistance)
• TR-53 - Life Cycle Assessment Summary of Drainage Pipe Alternatives
• TR-54 - Aging of HDPE Conduit: Evaluation of 20-year-old Conduit: Evaluation of 20-year-old Conduit -
• TR-55 - Historical Review of Pressure Rating Methods for PE and PEX Pipe in Gas Applications
• TR-56 - History of Crosslinked Polyethylene (PEX) Tubing in North America and Timeline of ASTM Standard Specification F876 from 1984 – new 2025