Made on
Tilda
Overview — NACE RP 0391 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. Key topics typically covered in RP 0391:
Purpose and scope: when internal coatings are appropriate and limitations. Material selection: types of coatings/linings (epoxy, polyurethane, fusion-bonded epoxy, cement mortar, ceramic, thermoplastics) and compatibility with transported fluids. Surface preparation: cleaning, decontamination, mechanical or abrasive methods, and acceptable surface condition before lining/coating. Application methods: spray, brush/roller, centrifugal, extrusion, trowel; factory-applied vs. field-applied techniques. Quality control and inspection: thickness measurement, holiday testing (spark/voltage), adhesion testing, cure verification, visual acceptance criteria. Testing and qualification: lab and field test methods to verify performance (chemical resistance, abrasion/cavitation resistance, adhesion after immersion/temperature cycling). Preparation for commissioning and operation: drying, curing, initial flushing, pigging practices, inhibitor feed strategies. Repair and maintenance: procedures for field repairs, criteria for when recoating is required. Health, safety, and environmental considerations: ventilation, worker protection, waste disposal.
(The exact table of contents and wording depend on the edition; consult the official PDF for authoritative requirements.) Common internal-coating types & when to use them
Fusion-Bonded Epoxy (FBE)
Use: gas and oil pipelines, potable water (when certified), produced water lines. Strengths: good adhesion, chemical resistance, abrasion resistance. Limitations: sensitivity to high-temperature liquids (>120–150°C depending on grade), requires proper surface prep.
Epoxy Liners (plural-component)
Use: potable water, oil, produced water, high-corrosion environments. Strengths: excellent chemical resistance, can be field-applied, thick-film capability. Limitations: cure control, solvent content, possible cracking if misapplied. nace rp 0391 pdf
Cement Mortar Lining (CML)
Use: potable water distribution, sewage, some slurry lines. Strengths: good for abrasive slurries, bacteriological control in water. Limitations: vulnerable to acid attack, requires sufficient thickness and curing.
Thermoplastic Linings (PE/PP)
Use: aggressive chemical service, internal corrosion protection where flexibility/impact resistance needed. Strengths: chemical inertness, toughness. Limitations: adhesion challenges, installation complexity.
Ceramic/Glass Flake Coatings