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Thermoplastic Liners

Pipe with thick, flexible thermoplastic liners (i.e. HDPE, PVDF, PPS, PEX, PEEK) provides one of the safest ways to transport corrosive commodities.

Thermoplastic lined pipe is used for offshore and onshore oil production, mining slurries, and other aggressive applications.

Welded joint connections are often desired or required, particularly for offshore pipelines.

How It Works

  • Thermoplastic polymer sleeve bridges the weld zone.

  • Permits standard full-penetration weld of carbon steel pipe.

  • Faster joint assembly than any other welded joint solution.

  • Prevents welding heat from damaging the plastic liner.

  • Prevents liquids from reaching the bare steel behind the liner.

Seal Sleeve Interior

How It Works

Liner pulled through pipe and locked to pipe wall

  • Locking rings withstand >30 tons of force, ensuring liner will not move.

  • Liner insertion and locking to pipe wall may be done in shop, spool base, or in field.

  • Liner may be installed in any length of pipe section (12m or as long as currently possible).

How It Works

SealSleeve™ inserted into pipe ends during pipeline construction & girth weld performed

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How It Works

Cross Section Photo

Locked Liner End

View of plastic liner end. Plastic liner is locked in place using a steel locking ring embedded behind the liner, creating a stable, immovable seat for SealSleeve™ to seal against.

Cross Section Photo


SealSleeve™ Insertion

Continuous Liner Through Weld Zone

Protecting Lining Integrity Through Weld Zone

Insulation material in sleeve prevents welding heat from damaging plastic liner.

Infrared image of pipe exterior during welding

Infrared image of joint interior a moment later

Hydrostatic Pressure Tests

Hydrostatic pressure tests up to 500 bar (7,200 psi), without a weld.

The higher the pressure, the tighter the seal.

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Download SealSleeve™ Brochure PDF