Overview
Specifications
Defect Repair Details
Cost Evaluation
Manufacturing Quality Control
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Installation & Training


The PETROSLEEVE® repairs defects such as Seam or Pipe Body Cracking, Corrosion, Dents, Mechanical Defects, SCC (Stress Corrosion Cracking), and Arc Burns. Although the failure mechanism varies for each defect type, the following is a good outline description of various defects and how the installation of a PETROSLEEVE® permanently removes the failure mechanism of the defect.


Corrosion:


Corrosion defects are caused by a chemical reduction action on the surface of the pipe material, resulting in localized thinning of the pipe wall. Failure occurs first by bulging (yielding) at the corrosion site, followed by rupture of the steel membrane.

The installation of a PETROSLEEVE® provides mechanical support to the localized thinned section. It is this support that prevents bulging for all pressures, including during high pressure testing.


Gouge, Groove:

or Arc Burns:


T
hese defects are caused by either third-party damage or non-acceptable workmanship, and may include stress concentrators such as cracking. Failure occurs by the pipe material containing the defect flexing because of internal pressure variances, which in turn causes cracking. When the crack extensions become critical, rupture occurs.

The installation of a PETROSLEEVE® eliminates flexing in the pipe material and the stress state in the material surrounding the defect is put into compression, eliminating fatigue, crack extension, and rupture.

Dent:


Dent defects are caused by either third party damage or non-acceptable workmanship. As in the gouge, groove or arc burn cases, failure occurs by the pipe material containing the defect flexing because of internal pressure variances, which in turn causes cracking. When the crack extensions become critical, rupture occurs.

The installation of a PETROSLEEVE® eliminates flexing in the pipe material and places the pipe material into compression, eliminating fatigue, crack extension, and rupture.

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Pipe Body Crack:


Pipe Body Cracking is caused by various means, including chemical action (Stress Corrosion Cracking). Failure occurs when crack becomes unstable.

The installation of a PETROSLEEVE® permanently reduces the stress state in the material surrounding the defect, removing the possibility for crack extension.

Weld Defect:


Weld defects are caused by poor workmanship. Failure occurs when the strength of the weld is not sufficient to counteract the applied forces.

The installation of a PETROSLEEVE® permanently reduces the stress state in the material surrounding the defect, as well as providing support to the weld.

The PETROSLEEVE® provides permanent mechanical support to the weld area and reduces the strain induced in the weld by the external forces.

Grind Defect:


A grind defect is caused by mechanically removing metal from the surface of the pipe material, resulting in localized thinning of the pipe wall. In addition, stress concentrators could be present on the metal surface. Failure occurs first by bulging (yielding) at the grinding area, followed by rupture of the steel membrane. Additionally, the presence of stress concentrators could act as initiation points for rupture at lower strain levels.

The installation of a PETROSLEEVE® prevents bulging by permanently providing mechanical support to the localized thinned section. The sleeve also eliminates metal movement (fatigue), and reduces the strain induced in the material by the external forces.

Leaking/Through-wall Defect


A leak occurs when a hole in the pipe wall allows the liquid or pipeline product (i.e. oil or gas) to escape, while the pipe wall continues to contain the internal pressure preventing a rupture from occurring. Both leaking defects and active internal corrosion will proceed through the the wall of the pipeline if left unrepaired.


At present, development is underway to research and test a unique technique using the PETROSLEEVE® Repair System to repair both leaking defects and active internal corrosion.

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