# Pipeline Safety: Standards Update-PPI-TR 4
> **Pipeline and Hazardous Materials Safety Administration** · Direct final rule (DFR); confirmation of effective date. · Published 2025-10-02 · Effective 2026-01-01 · 90 FR 47623
## Document
- **Document number:** 2025-19334
- **Category:** pipeline-safety
- **Sub-agency:** Pipeline and Hazardous Materials Safety Administration
- **Federal Register citation:** 90 FR 47623
- **CFR reference:** 49 CFR 192
- **Publication date:** 2025-10-02
- **Effective date:** 2026-01-01
- **DOT docket:** Docket No. PHMSA-2025-0132
## Abstract

PHMSA is confirming the effective date for the DFR that appeared in the Federal Register on July 1, 2025. The DFR amended PHMSA's regulations to incorporate by reference the updated industry standard Plastic Pipe Institute (PPI) Technical Report (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."

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2025/10/02/2025-19334/pipeline-safety-standards-update-ppi-tr-4)
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