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Pipe PU Lining & Coating

Pipe PU Lining & Coating | Chema Engineers
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Pipe PU Lining / Coating

Slurry Spool Corrosion & Abrasion Protection

Polyurethane pipe lining is used to protect steel pipes from abrasion, corrosion, and impact in slurry and pneumatic conveying systems. Chema Engineers does both cast-in-place and pre-molded sleeve PU lining for new pipes and retrofits.

Types of PU Pipe Lining

  1. Cast PU Lining: Liquid PU poured and centrifugally cast inside steel pipe. Thickness 6mm to 25mm, uniform wall, no seams. Lengths up to 6 meters per piece. Best bond strength: PU chemically bonds to steel.
  2. Pre-molded PU Sleeve/Tube: Molded PU tube inserted into steel pipe. For diameters 50mm to 600mm NB. Replaceable sleeves for maintenance. Flanged ends or plain ends with PU lip seal.
  3. Spray PU Lining: For large dia pipes >600mm, tanks, chutes. Thickness 3mm to 12mm, applied on-site. Fast turnaround for refurbishment.
  4. PU Lined Bends & Fittings: 45°, 90°, 180° elbows, tees, reducers. Higher wear zones get extra thickness or ceramic-chip reinforced PU.

Key Features & Technical Specs

Specification / Parameter Details & Capabilities
MaterialAbrasion-resistant polyurethane, Shore A 85-95. 85A for large particle impact (coal, aggregate), 95A for fine particle slurry (iron ore, tailings, sand).
Pipe Sizes25mm NB to 1200mm NB.
Temperature Limit-20ac to +80ac continuous. Special grades to +100ac.
Abrasion Loss<40 mmA3 per DIN 53516 for 95A grade.
Elongation>400% absorbs impact without cracking.

Benefits vs Rubber, Ceramic, Basalt Lined Pipe

  • 5-8x longer life than rubber in sharp, coarse slurry.
  • Lightweight: 1/3rd weight of basalt/ceramic lined pipe - easier install.
  • Impact resistance: No cracking like ceramic tiles under water hammer.
  • Smooth bore: Low friction = less pumping power vs rubber lined.
  • No corrosion: PU seals steel from acidic/alkaline slurry.