Nace Rp 0391 Pdf Jun 2026

If you are searching for the PDF, you may encounter confusion regarding the document prefix.

Carbon steel is the most common material for concentrated sulfuric acid service. The standard explains why and under what strict conditions. It notes that while carbon steel initially corrodes, an insoluble iron-sulfate protective film forms, drastically reducing the corrosion rate. However, this film is fragile. To preserve it, the standard mandates:

NACE RP 0391 bridges this gap. It provides the methodology to ensure that the lining selected is not only chemically compatible with the process but also mechanically robust enough to withstand the friction and impact of particulate matter. nace rp 0391 pdf

: The historical legacy versions that established fundamental guidelines for ambient-temperature carbon steel and alloy applications.

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NACE RP 0391 is a Recommended Practice published by NACE International (now AMPP) that gives guidance on evaluating, selecting, applying, and testing coatings for the internal protection of metallic pipelines and piping systems handling various fluids. It focuses on corrosion control inside pipelines (e.g., water, oil, gas, produced water) where internal coatings, linings, and auxiliary measures (pigging, corrosion inhibitors) are used to extend service life and reduce maintenance.

Always check the revision history. The original has been superseded. The current version as of 2025 is AMPP SP0391-2018 (R2023) — the "R2023" means reconfirmed in 2023 with no technical changes. It notes that while carbon steel initially corrodes,

Epoxy Liners (plural-component)

apply to acid concentrations below 90% or temperatures above 50°C. Supersession

: You can buy the authorized digital version through the AMPP Store or the Accuris Standards Store.

Engineers, operators, and maintenance personnel in the Chemical Process Industries (CPI).