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DOT/PHMSA RIN: 2137-AG01 Publication ID: Spring 2025 
Title: ●Pipeline Safety: Standards Update – PPI-TR 4  
Abstract:

This DFR amends PHMSA’s regulations to incorporate by reference the updated industry standard PPI TR-4, PPI HSB Listing of Hydrostatic Design Basis (HDB), Hydrostatic Design Stress (HDS), Strength Design Basis (SDS), Pressure Design Basis (PDB) and Minimum Required Strength (MRS) Ratings For Thermoplastic Piping Materials or Pipe. This updated standard will maintain or improve public safety, prevent regulatory confusion, reduce compliance burdens on stakeholders, and satisfy a mandate in the National Technology Transfer and Advancement Act (NTTAA) of 1995. 

 
Agency: Department of Transportation(DOT)  Priority: Substantive, Nonsignificant 
RIN Status: First time published in the Unified Agenda Agenda Stage of Rulemaking: Completed Actions 
Major: No  Unfunded Mandates: No 
EO 14192 Designation: Deregulatory 
CFR Citation: 49 CFR part 192     (To search for a specific CFR, visit the Code of Federal Regulations.)
Legal Authority: 30 U.S.C. 185(w)(3)    49 U.S.C. 5103, 60101 et. seq.    49 CFR 1.97    49 U.S.C. 60102   
Legal Deadline:  None
Timetable:
Action Date FR Cite
Direct Final Rule  07/01/2025  90 FR 28075   
Direct Final Rule Effective  01/01/2026 
Regulatory Flexibility Analysis Required: No  Government Levels Affected: None 
Federalism: No 
Included in the Regulatory Plan: No 
RIN Data Printed in the FR: No 
Agency Contact:
Brianna Wilson
Transportation Specialist
Department of Transportation
Pipeline and Hazardous Materials Safety Administration
1200 New Jersey Avenue SE,
Washington, DC 20590
Phone:771 215-0969
Email: brianna.wilson@dot.gov