The Pipeline and Hazardous Materials Safety Administration (PHMSA), within the U.S. Department of Transportation, has issued a Notice of Proposed Rulemaking (NPRM) proposing amendments to modernize anomaly response and repair criteria for gas transmission and hazardous liquid transmission pipelines. Comments are due 60 days after Federal Register publication.

The NPRM addresses a core component of pipeline integrity management: how operators must respond when inspection tools or other assessment methods identify anomalies — defects, corrosion, dents, cracks, or other features — in a pipeline. The proposed changes would revise response schedules (how quickly operators must respond to different categories of anomalies), anomaly evaluation requirements, material property records obligations, and repair and remediation criteria.

Pipeline integrity management is the systematic process by which pipeline operators assess, monitor, and maintain the safety of their pipeline systems. Under existing PHMSA regulations (49 C.F.R. Parts 192 and 195), operators of gas transmission and hazardous liquid pipelines are required to:

• Conduct periodic inline inspections (ILI) using inspection tools (commonly called "smart pigs") or other approved assessment methods
• Evaluate anomalies identified during inspections to determine whether they require immediate repair, scheduled repair, or monitoring
• Respond to anomalies within specified timeframes based on the severity of the anomaly and the pipeline's operating conditions
• Maintain records of material properties (pipe specifications, seam type, grade, wall thickness) that are used in anomaly evaluation calculations

The existing framework has been in place, with periodic updates, since the Pipeline Safety Improvement Act of 2002 and the Pipeline Inspection, Protection, Enforcement, and Safety Act of 2006. PHMSA's NPRM represents a significant proposed update to this framework.

Revised Response Schedules

The NPRM proposes revisions to the response schedules that govern how quickly operators must respond to anomalies identified during inspections. Under the existing framework, anomalies are categorized by severity, and operators must respond within specified timeframes — ranging from immediate action for the most severe anomalies to scheduled remediation for lower-priority findings.

The proposed revisions would update these schedules to reflect advances in inspection technology, anomaly evaluation methods, and pipeline safety research. The specific proposed timeframes and categorization criteria are set out in the NPRM and are subject to public comment.

Anomaly Evaluation Requirements

The NPRM proposes updated requirements for how operators must evaluate anomalies identified during inspections. Anomaly evaluation involves applying engineering assessment methods — including fracture mechanics calculations, corrosion growth models, and fitness-for-service assessments — to determine the severity of an anomaly and the appropriate response.

The proposed changes would update the evaluation methods and criteria to reflect current engineering standards and research, including updates to the interaction rules for closely spaced anomalies and the treatment of anomalies in high-consequence areas (HCAs).

Material Property Records

Accurate material property records — pipe specifications, seam type, grade, wall thickness, and other physical characteristics — are essential inputs to anomaly evaluation calculations. Operators who lack complete material property records for portions of their pipeline systems must use conservative assumptions in their calculations, which can result in more conservative (and costly) repair obligations.

The NPRM proposes updated requirements for material property records, including requirements for operators to take additional steps to establish or verify material properties for pipeline segments where records are incomplete or uncertain. This is a significant operational and compliance issue for older pipeline systems where original construction records may be incomplete.

Repair and Remediation Criteria

The NPRM proposes revisions to the criteria that determine when an anomaly must be repaired (versus monitored or managed through other means) and the methods by which repairs must be made. The proposed changes would update the repair criteria to reflect advances in repair technology and engineering standards.

Change-in-Law Clauses in EPC and O&M Contracts

Engineering, Procurement, and Construction (EPC) contracts and Operations and Maintenance (O&M) contracts for pipeline projects typically include change-in-law provisions that allocate the cost of compliance with new regulatory requirements between the project owner and the contractor. If the PHMSA NPRM is finalized, it will constitute a change in law that may trigger these provisions.

Project owners and contractors should review their existing contracts to understand how change-in-law costs are allocated, what notice and documentation requirements apply, and whether the proposed PHMSA changes fall within the scope of the change-in-law definition in their contracts.

Compliance Cost Allocation in Project Agreements

For pipeline projects under development or in early operation, the NPRM creates uncertainty about future compliance costs. Project agreements — including concession agreements, transportation service agreements, and financing documents — should address how compliance cost increases resulting from regulatory changes are allocated among project parties.

Inspection and Integrity Management Contracts

Pipeline operators typically engage specialized inspection vendors and integrity management consultants under long-term service contracts. The NPRM's proposed changes to anomaly evaluation methods and response schedules may affect the scope of work, inspection frequencies, and deliverable requirements under these contracts. Operators should review their inspection and integrity management contracts to assess whether the proposed changes would require contract modifications.

Indemnity and Insurance

The NPRM's proposed changes to repair criteria and response schedules may affect the allocation of liability for pipeline incidents between operators, contractors, and insurers. Indemnity provisions in pipeline construction and O&M contracts, and coverage terms in pipeline operator insurance policies, should be reviewed in light of the proposed changes.

Documentation Obligations

The NPRM's proposed requirements for material property records create documentation obligations that may affect pipeline operators' record-keeping practices and the scope of due diligence in pipeline asset transactions. Buyers of pipeline assets should assess the completeness of the target's material property records as part of their transaction diligence.

Turkish energy companies with U.S. pipeline assets. Turkish energy companies or investors with ownership interests in U.S. gas transmission or hazardous liquid pipeline systems should monitor the NPRM and assess its potential impact on their integrity management programs and compliance costs. The comment period — 60 days after Federal Register publication — provides an opportunity to submit comments on the proposed changes.

EPC contractors on U.S. pipeline projects. Turkish EPC contractors working on U.S. pipeline projects should review their contracts for change-in-law provisions and assess how the proposed PHMSA changes might affect their scope of work and cost obligations.

Infrastructure investors. Turkish infrastructure investors evaluating U.S. pipeline assets should incorporate the NPRM's potential compliance cost implications into their financial models and due diligence frameworks. Material property record completeness is a specific diligence item for older pipeline systems.

Cross-border pipeline projects. Turkish energy companies involved in cross-border pipeline projects with U.S. regulatory exposure should assess whether the PHMSA NPRM creates compliance obligations for their U.S.-regulated pipeline segments.

ULF New York advises Turkish energy companies and infrastructure investors on U.S. energy regulatory matters, pipeline project contracts, and cross-border infrastructure transactions.