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USDOT Pipeline and Hazardous Materials Safety Administration Engineering & Research Division Office of Pipeline Safety

USDOT Pipeline and Hazardous Materials - Safety ... · FBE coating cracked from expansion during hydrotest ... USDOT Pipeline and Hazardous Materials - Safety AdministrationOffice

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USDOT Pipeline and Hazardous Materials Safety Administration

Engineering & Research DivisionOffice of Pipeline Safety

OST

PHMSA

OHMS OPS

OIG

FHWA

FRA

FAA

SLSDC

NHTSA

MARAD

FMCSA

FTA STB

U. S. Department of Transportation (DOT)

2

Office of Hazardous Materials SafetyOffice of Pipeline Safety

PHMSA Mission

Our mission is to protect people and the environment by advancing the safe transportation of energy and other hazardous materials that are essential to our 

daily lives.

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What PHMSA OPS Regulates

System Type Miles % Miles # Operators

Hazardous Liquid Pipeline 199,3347,677 Tanks 7% 456

Gas Transmission Pipeline 301,810 11% 1,020

Gas Gathering Pipeline 17,663 1% 367

Gas Distribution Pipeline(Mains & Services ) 2,168,599 81% 1,373

Total (Pipeline) 2,687,406 100%Some Operators

have multiple System Types

Liquefied Natural Gas 115 Plants 205 Tanks 83

Some of PHMSA OPS’sRoles and Responsibilities

• Development and Implementation of Safety Regulations– 49 CFR Part 192 – Transportation of Natural and Other Gas by 

Pipeline– 49 CFR Part 195 – Transportation of Hazardous Liquids by Pipeline

• Perform Comprehensive Inspections• Monitor and Enforce Compliance

– Require remedial actions– Assess civil penalties – Criminal referral

Underlying Principles• Operator responsibility to understand and safely manage the 

risks (safety conditions) associated with their pipelines • PHMSA’s primary role is to establish minimum safety 

standards (regulations) and to verify that the operators perform to these standards

• PHMSA also strives to impact operator performance beyond mere compliance with the regulations

• Focus is on SAFETY PERFORMANCE

Linepipe: X70 & X80 below SMYS• 2009 Advisory Bulletin (ADB‐09‐01) 

http://www.phmsa.dot.gov/pipeline/regs/advisory‐bulletin

• Inconsistent chemical and mechanical properties • Poor mill rolling practices

Girth Weld Quality & Misalignment2010 Advisory Bulletin (ADB‐10‐03) Girth weld quality issues due to improper transitioning, misalignment, and welding practices of large diameter linepipehttp://www.phmsa.dot.gov/pipeline/regs/advisory‐bulletin

Below failure @ 65% SMYS

Improper Weld Transitions

ASME B31.8 Fig. I‐5

Misalignment at Segmented Bend

Segmenting Induction Bends

Tangent EndTangent End

EndTolerances

BodyTolerances

Cross‐section of Induction Bend

• Avoid segmenting bends (order the exact bend angle or use cold field bends when possible)

• When cutting bends, use segmentable bends with tighter body tolerances, confirm acceptable end dimensions, and use transition pipe pups 

Segmenting Bends• Best practice: Do not segment bends. Very difficult to do properly. 

Order bends to final angle & utilize cold field bends.• “Guidance for Specification and Purchase of Segmentable 

Induction Bends and Elbows (Phase 1 Final Report)”– http://www.ingaa.org/File.aspx?id=18182

• “Guidance for Field Segmentation and Welding of Induction Bends and Elbows (Phase 2 Final Report)”– http://www.ingaa.org/File.aspx?id=18183

Elbows: Actual Strength < SMYS

Hydrotest failure at 80% of test pressure

FBE coating cracked from expansion during hydrotest

Elbows: Actual Strength < SMYS