NACE SP0170, also known as "Control of Stray Current Corrosion," provides guidelines and best practices for the control of stray-current corrosion that can affect pipelines, metallic structures, and other infrastructure. Stray current corrosion is an electrochemical process that can lead to significant damage and leaks in pipelines and similar structures.
SP0170 prescribes a multi-stage ECDA process. The classic four-step ECDA framework appears with refinements: nace sp0170 pdf 2021
Indirect Inspection
Direct Examination (Verification)
Post-Assessment
NACE SP0170-2021 – Zinc Thermal Spray for Concrete CP
✅ Min zinc purity: 99.5%
✅ Min bond: 1.5 MPa
✅ Thickness: 250–500 µm
✅ Max porosity: 5%
✅ Topcoat within 7 days if exposed to chlorides
✅ Activation required for high-alkali concrete (pH > 12.5)
✅ Do NOT use on unbonded prestressed strands
Would you like a downloadable PDF checklist or one-page field summary based on this content? NACE SP0170, also known as "Control of Stray
NACE SP0170-2010 (updated 2021) — formally titled “Guidelines for Enhanced External Corrosion Direct Assessment (ECDA) for Pipelines” — provides industry guidance to assess and mitigate external corrosion on buried or submerged metallic pipelines. This essay examines the document’s scope, key methodologies, technical foundations, strengths, limitations, practical implications, and recommendations for pipeline operators and regulators. (For clarity: the following analysis assumes the 2021 update refines prior ECDA guidance; where the standard’s clause numbering or exact text is required, consult the official PDF.) Indirect Inspection