Epoxy Composition Filled 
Reinforcing Sleeves

for high pressure pipelines with non-leakage defects

 Application of Sleeves

  • installation without shutdown

  • no welding onto a live pipeline (cold sleeves)

  • suitable for all types of defects with a depth up to 80 % WT

  • convenient for pipes with extreme ovality, bends, 
    and defective welds

  • unlimited length of pipeline to be reinforced

  • installation from –5 to +120 ºF

  • high integrity of the reinforced pipeline

Installation Effects of Sleeve 

Field Experience  

Design and Installation Data

TESTS

Chart and Sketch

Installation Effects of Sleeve Na začátek této stránky

  • local reinforcing of pipe wall in defect area

  • prevention from defect bulging and crack opening—reduced static and cyclic load in the defect from internal pressure of medium transported

Field Experience Na začátek této stránky

  • over 800 sleeves installed on high-pressure gas and oil pipelines
    OD 20—40", MAOP 64 to 75 bar in Czech Republic, Slovakia and Slovenia since 1993

  • repaired defects include: corrosion, lamination, spalling, buckling, 
    gouges, gouged dents, weld defects, cracks

Design and Installation Data Na začátek této stránky

  • epoxy curing time: 24 hours

  • maximal temperature of pipeline is 120 °F

  • grit-blasted pipe surface under sleeve

  • for safety reasons about 20% reduction of the operating pressure 
    is recommended in the course of sleeve installation 
    (only for critical defects)

Tests Na začátek této stránky

Design of the epoxy composition-filled sleeves has been certified by the National Research Institute of Material—SVÚM, Prague. Long-lasting cyclic load and temperature resistance tests were conducted and in the course of this test complex tenzometric measurements has been taken.

In the year 2000 has been successfully tested integrity of the wall fault repaired by sleeve several years ago on OD 20" oil pipeline MAOP 64 bar. The pipe with fault repaired has been removed from pipeline and very intensively tested for integrity 
and cyclic loading resistivity. All this tests had proved high level 
of repaired area safety and reliability.

 

Fault Repair Using Sleeve Influence To Mechanical Load To pipe Wall

pipe: OD 32", MAOP 75 bar; defect: metal loss 50 %

cyclic and static load = hoop deformation in the middle of defect (e)
  

Sketch of Sleeve Installation

1 – split sleeve; 2 – distance band; 3 – epoxy composition;
4 – filling/check threaded plugs; D – defect; – welds

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