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Internal Sleeve Innovation


Flexibility : Thin-gauge assembly adjusts to pipe shape for easy insertion & consistent seal quality.

Sealing : Bore seals accommodate pipe ID tolerances and seal at any pipeline pressure.

Weld Quality : Flexibility allows for a better fit, easier root pass, and more consistent weld quality.

Heat Resistance : Wider sleeve & thicker insulation reduces heat impact & does not slow down welding.

Large Diameters : Accommodates out of round pipe

Automatic Welding : Compatible with internal lineup clamps & automatic welding

Patents Pending

SealSleeve™ for Thermoplastic Liners

Plastic Liner Locked

Plastic liner locked to pipe wall using proprietary method. This creates an immovable seat for SealSleeveTM to seal against

Seal Sleeve Insertion

SealSleeveTM inserted into 1st pipe end, sealing against the immovable seat.

SealSleeve Interior

2nd pipe comes over SealSleeveTM end protruding from 1st pipe and weld is performed, allowing for a plastic liner through the weld zone.


  • Fast Joint Construction: Ideal for offshore J-Lay / S-Lay vessels and shorter lined pipe sections requiring more frequent joint connectors.
  • Highly Repeatable Joint Quality:  Seal design is well proven and easy to install with consistent quality.
  • High Pressure Applications: Withstands whichever pressure the pipe can withstand.
  • Standard Carbon Steel Welds: Permits standard full penetration welds and NDE for carbon steel pipe.

Patents Pending

Pipe Lining Materials Used with LPS Joint Technology

Carbon steel pipe with welded joints provides optimal strength and ductility for pipelines. However, virtually any liquid or slurry being transported via pipeline (except sweet oil & gas) will corrode steel. LPS’ welded joint system permits the use of carbon steel pipe with polymer lining materials that provide long-term protection of the steel. The following are some of the premium lining materials used in conjunction with LPS FlexSleeves and Joint Lock Rings to keep pipe interiors from corroding.

Aromatic Polyurethane

  • Withstands stress from pigging and
    internal lineup clamps

  • Sufficient flexibility and elongation for thermal expansion, pipe handling & cold bends

Thermoplastic Polyurethane

  • Excellent abrasion resistance & sufficient thickness for highly abrasive slurries
  • Superior physical properties (tensile, tear, elongation)
  • Very good adhesion to steel

Natural & Synthetic Rubber

  • Excellent abrasion resistance & sufficient thickness for highly abrasive slurries

  • Superior resilience and elongation

  • Excellent adhesion to steel

  • Synthetic rubbers are resistant to high temperatures & various chemicals

Fusion & Liquid Bonded Epoxy

  • Cost-efficient corrosion protection for water pipelines

  • Excellent adhesion to steel

  • Good chemical resistance

  • Novolac & phenolic epoxies provide very good heat & chemical resistance

Thermoplastic Polyamides (Nylon)

  • High flexibility

  • Good heat resistance

  • Good abrasion resistance

  • Resistant to oils and many chemicals
  • Low moisture absorption

Hi-Density Polyethylene

  • Very low water permeation

  • Good abrasion resistance

  • Sufficient thickness to eliminate possibility of liner pinholes

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Common Pipeline Applications

Most liquids being transported by pipeline are corrosive to carbon steel. The following are common applications for LPS joint technology:

Oil & Gas

  • Produced Water

  • Sour Oil & Gas

  • Sea Water Injection
  • Fracking Water


  • Continental Water

  • Desalinated water

  • Wastewater


  • Process water

  • Tailing Slurry

  • Coarse Ore Slurry

  • Concentrate Slurry

  • Solution Mining (Brines)

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