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Subpart A—General15

Subpart B—Annual, Accident, and Safety-Related Condition Reporting14

Subpart C—Design Requirements20

Subpart D—Construction29

Subpart E—Pressure Testing9

Subpart F—Operation and Maintenance34

Subpart G—Qualification of Pipeline Personnel5

Subpart H—Corrosion Control22

Regulationcurrent

49 CFR 195.577

What must I do to alleviate interference currents?

Current as of 2026-08-18 Government source

eCFR editorial compilationAuthoritative but unofficial

View source

(a)For pipelines exposed to stray currents, you must have a program to identify, test for, and minimize the detrimental effects of such currents.#

(b)You must design and install each impressed current or galvanic anode system to minimize any adverse effects on existing adjacent metallic structures.#

PHMSA HL.2022.01

2022 Hazardous Liquid IA Question Set

TD.CPMONITOR.INTFRCURRENT.P — 195.577(a), 195.577(b) (+2 more questions) · examined by inspection

Inspection

PHMSA HL.2021.01

2021 Hazardous Liquid IA Question Set

TD.CPMONITOR.INTFRCURRENT.P — 195.577(a), 195.577(b) (+2 more questions) · examined by inspection

CPF 32022051NOA

FLINT HILLS RESOURCES, LC — Notice of Amendment

195.577(a) · cited in enforcement

2022 Hazardous Liquid IA Question Set

2021 Hazardous Liquid IA Question Set

FLINT HILLS RESOURCES, LC — Notice of Amendment

EAGLE US 2 LLC — Notice of Probable Violation

FORE RIVER ENERGY CENTER — Notice of Probable Violation

TALLGRASS PONY EXPRESS PIPELINE, LLC — Notice of Probable Violation

VALERO PARTNERS OPERATING CO. LLC — Notice of Amendment

MARKWEST PIPELINE COMPANY, L.L.C. — Warning Letter

COLONIAL PIPELINE CO — Notice of Amendment

TALOS ENERGY, LLC — Notice of Amendment

CHEVRON PRODUCTS COMPANY — Warning Letter

HOLLY ENERGY PARTNERS - OPERATING, L.P. — Notice of Probable Violation

DAKOTA GASIFICATION COMPANY — Notice of Amendment

DAKOTA GASIFICATION COMPANY — Notice of Probable Violation

RESOLUTE NATURAL RESOURCES COMPANY — Notice of Amendment

CHAPARRAL ENERGY, LLC — Notice of Probable Violation

SUNOCO PIPELINE L.P. — Notice of Amendment

TC OIL PIPELINE OPERATIONS INC — Notice of Probable Violation

CRESTWOOD DAKOTA PIPELINE LLC — Notice of Amendment

BLACK ELK ENERGY LLC — Notice of Amendment

TRINITY PIPELINE GP LLC — Notice of Amendment

KINDER MORGAN CO2 CO. LLC — Notice of Probable Violation

KINDER MORGAN CO2 CO. LLC — Notice of Amendment

HAWAII ELECTRIC LIGHT — Notice of Probable Violation

PAR HAWAII REFINING, LLC — Notice of Probable Violation

TC OIL PIPELINE OPERATIONS INC — Warning Letter

MARKWEST RANGER PIPELINE COMPANY, L.L.C. — Notice of Amendment

EXPRESS HOLDINGS (USA), LLC — Notice of Probable Violation

PHILLIPS 66 PIPELINE LLC — Notice of Probable Violation

EXPLORER PIPELINE CO — Notice of Amendment

BELLE FOURCHE PIPELINE CO — Notice of Probable Violation

FLORIDA POWER & LIGHT CO — Warning Letter

AIRCRAFT SERVICES INTERNATIONAL GROUP (ASIG) — Warning Letter

BUTTE PIPELINE CO — Notice of Probable Violation

NGL SUPPLY TERMINAL COMPANY LLC — Notice of Probable Violation

CYPRESS INTERSTATE PIPELINE LLC — Warning Letter

KINDER MORGAN CO2 CO. LLC — Notice of Amendment

HUNT CRUDE OIL SUPPLY CO — Warning Letter

TARGA MIDSTREAM SERVICES, L.P. — Notice of Probable Violation

NUSTAR LOGISTICS, L.P. — Notice of Amendment

NIPPON OIL EXPLORATION USA LIMITED — Notice of Amendment

HOLLY ENERGY PARTNERS - OPERATING, L.P. — Notice of Amendment

VALERO TERMINALING AND DISTRIBUTION COMPANY — Warning Letter

ZENITH ENERGY TERMINALS HOLDINGS, LLC — Notice of Amendment

TRI-STATES NGL PIPELINE LLC — Warning Letter

JAYHAWK PIPELINE LLC — Notice of Amendment

TPM, INC — Warning Letter

MERIT ENERGY COMPANY — Notice of Amendment

DUKE ENERGY OHIO - LIQUID — Notice of Amendment

DAKOTA GASIFICATION COMPANY — Notice of Amendment

NUSTAR PIPELINE OPERATING PARTNERSHIP L.P. — Notice of Probable Violation

CALUMET MONTANA REFINING, LLC — Notice of Amendment

DENBURY ONSHORE, LLC — Warning Letter

PHILLIPS 66 PIPELINE LLC — Notice of Probable Violation

EXPRESS HOLDINGS (USA), LLC — Notice of Probable Violation

SINCLAIR TRANSPORTATION COMPANY — Notice of Amendment

PHILLIPS 66 PIPELINE LLC — Notice of Probable Violation

NORTH DAKOTA PIPELINE COMPANY LLC — Notice of Amendment