Pipeline Repair

Planned repair of damaged sections of pipelines is normally performed by employing one of the following technologies:

  • cut out and replacement of a damaged section of pipe;
  • welding a steel sleeve onto a damaged section of pipe;
  • welding a specially designed steel sleeve, onto a damaged section of pipe into which an epoxy–based compound is injected into the annular space between the sleeve and the pipe surface;
  • hard facing build up of metal using electric arc welding or welding on patches.


damaged sections of pipelines
These technologies, as a rule, are both expensive and libor-intensive, because they require a major investment in labor, including hot processes with the deployment of much equipment. Furthermore, the introduction of additional metal onto the surface can result in the distruption of cathodic protection or create corrugations, as a result of cyclic loading pressure.

At the same time, damage to pipe sections can be eliminated by the use of composite sleeves. In this case, the most efficient solution is to use WrapMaster new generation composite sleeves. WrapMaster sleeves are not only a guaranteed means of permanent repair (i.e. they do not require subsequent replacement with minimally guaranteed lifetime of 50 years), but also give an economic and technological benefits of their use:

- Quick repair without hot tapping, without reduced pipeline throughput and use of heavy equipment. Installing composite sleeves requires a two-man crew working for 30 minutes. The repaired area is cured and ready for back filling in just two hours.

- This is the only composite sleeve that is detectable by intelligent pig pipeline inspection  tools, thus eliminating erroneous excavations of any previously repaired defects.

 
 
 
 
 
 

In cases where more complex pipeline repairs are required on a live line, hot tapping methods can be used.

 

hot tapping – installation of the tapping machine