Combat Pipeline Corrosion Through Adequate Surface Preparation

Originally published in ipcm (International Paint & Coating Magazine), April 2021. Author: J.F. Doddema, MontiPower.

Pipeline corrosion is one of the most costly and consequential challenges in the energy and process industries. The failure of a buried or above-ground pipeline can mean environmental contamination, unplanned shutdowns, and significant remediation costs. Yet corrosion is preventable — and the most critical factor in effective corrosion prevention is surface preparation.

Why Surface Preparation Is the Foundation of Pipeline Integrity

A coating system is only as good as the surface it is applied to. Research consistently shows that premature coating failure — the primary precursor to corrosion — is more often caused by inadequate surface preparation than by coating material failure. This is not a new finding, but it continues to be underappreciated in maintenance planning and budgeting.

The two critical parameters of surface preparation are:

• Cleanliness: Removal of rust, mill scale, contamination, and previous coatings to the specified level (typically Sa 2½ / SSPC-SP10 for protective coating applications)
• Anchor profile: Creation of a surface roughness that provides mechanical adhesion for the coating — typically 65–85 µm Rz (2.6–3.3 mil) for industrial protective coatings

If either parameter falls short of specification, coating adhesion is compromised and service life is reduced.

The Limitations of Conventional Pipeline Preparation Methods

Abrasive blasting is the benchmark method for achieving Sa 2½ with the required anchor profile. But for pipeline maintenance — particularly on in-service buried or partially buried pipelines — blasting presents serious practical limitations:

• Containment structures required for above-ground exposed sections
• Waste abrasive collection and disposal in environmentally sensitive areas
• Operational restrictions near populated areas or water crossings
• Logistical challenges in remote pipeline corridors
• Hot-work permit requirements in classified zones

For excavated pipeline sections in direct maintenance situations, these limitations often make blasting impractical. The result is a compromise on preparation quality — and therefore on the expected performance of the recoating system.

Bristle Blasting: The Pipeline Maintenance Solution

The Bristle Blaster® resolves the core dilemma of pipeline maintenance preparation. By delivering Sa 2½ / SSPC-SP10 cleanliness and 65–85 µm Rz anchor profile without abrasive media, it enables proper preparation in exactly the environments where blasting fails.

For buried pipeline maintenance, the Bristle Blaster® allows maintenance crews to:

• Prepare excavated pipe sections to specification at the dig site
• Work without containment structures or abrasive waste management
• Apply approved recoating systems immediately after preparation
• Document preparation quality for asset integrity records

The Two-Step Method for Heavily Corroded Pipeline

On heavily corroded pipeline sections where rust depth and scale thickness exceed what the Bristle Blaster® alone can efficiently address, MontiPower recommends the Two-Step Method:

1. Tercoo®: Removes heavy rust, thick mill scale, and bulk contamination — providing the clean substrate for the second step
2. Bristle Blaster®: Creates the final surface profile and cleanliness to SSPC-SP10 specification

This method handles the full range of pipeline surface conditions encountered in maintenance programs — from lightly corroded above-ground sections to severely degraded buried pipe discovered during excavation surveys.

Proven Performance Under Field Conditions

MontiPower's pipeline preparation solutions have been deployed on major pipeline maintenance programs across Europe, the Middle East, and the Americas. Independent pull-off adhesion testing on recoated pipe sections prepared with Bristle Blaster® consistently meets or exceeds the values recorded on blast-prepared reference samples.

For asset owners and operators, this means confidence that Bristle Blaster®-prepared maintenance coatings will deliver the expected service life — and that the investment in recoating is protected by a properly prepared substrate.

To discuss pipeline surface preparation for your specific maintenance program, contact MontiPower's technical team.