Internal Pipe Surface Preparation & Coating
Internal pipe corrosion is one of the most common failure modes in refineries, chemical plants, and water distribution systems — yet external surface preparation alone cannot protect the pipe bore. BLAST APEX internal pipe tools provide 360° surface preparation and coating from within the pipe, without excavation or pipe removal.
Both the internal pipe blaster and internal pipe coater feature scissor-type centering wheels that maintain tool position at pipe center, ensuring uniform profile and film thickness across the full pipe circumference. Inserted via flanged openings or cut inspection points, these tools eliminate the need to dig, isolate, or replace buried or hard-to-access pipe sections.
2"–36"
Pipe Diameter
Sa2.5
Surface Profile
360°
Uniform Coverage
Pipe Blasting vs Coating: Key Differences
Internal Pipe Blasting Tool
Purpose: Remove rust, scale, old coating from pipe bore. Output: Sa2.5 surface profile ready for coating. Abrasive: Copper slag or garnet at 4-8 bar. Next step: Apply internal coating.
Internal Pipe Coater
Purpose: Apply protective lining/epoxy to prepared pipe bore. Output: Uniform DFT 100-500µm. Coating: Epoxy, PU, FBE via airless spray at 150-300 bar. Prerequisites: Pipe must be blast-cleaned to Sa2.5 first.
⚠️ Sequence matters: Always BLAST first → inspect profile → then COAT. Never coat over un-prepared surfaces.
Internal Pipe Systems
Internal Pipe Blasting Tool
360° internal cleaning system for pipelines from 2" to 36" diameter, featuring scissor-type centering and deflection logic.
Best For:
Cross-country pipelines, refinery piping, water mains, chemical plant process lines
Internal rust & scale removal — Sa2.5, 30-75µm profile.
Internal Pipe Coater
360° internal painting system for pipe lining from 2" to 36" diameter, featuring adjustable wheel centering and airless atomization.
Coatings:
Epoxy (standard), polyurethane, FBE (fusion-bonded epoxy), phenolic (food-grade on request)
Internal epoxy lining — 100-500µm DFT, corrosion prevention.
Frequently Asked Questions
What is the largest pipe diameter internal blast tools can handle?
Internal pipe blast tools range from 2" (50mm) to 60" (1,500mm) diameter. For pipes below 4": use internal rotating spindle tools with flexible shaft. For 4"-12": standard internal blast machine with reversible drive. For 12"+: use pipe cleaning pigs with integrated nozzles or remote-controlled internal robot blaster. BLAST APEX supplies tools for 2"-48" pipe diameters.
What surface profile do internal pipe tools create?
Internal pipe blast tools achieve Sa2.5 (Near-White Metal) with 30-75µm Rz profile, depending on abrasive type and pressure. The profile is critical for coating adhesion in pipeline service. After internal blast, the pipe must be cleaned (no residual abrasive) and coated immediately — residual abrasive causes film discontinuity and premature failure.
How do I clean up residual abrasive after internal pipe blasting?
After internal pipe blast: (1) Run air lance to blow loose abrasive to nearest opening. (2) Use foam pigs or gel swabs to pick up remaining fines. (3) Run brush pig for final cleanup. (4) Visual and profile inspection. (5) Coat within the recoat window. NEVER coat over residual abrasive. Budget cleanup time as 30-40% of blast time.