The use of full-encirclement steel sleeves for pipeline repair is a relatively mature technology. As a result, relatively little is written about the use of steel sleeves (Type A) compared to the use of composites (Type B) where new products are continually introduced. Type A sleeves simply encircle the pipeline and provide structural reinforcement of the defective area. To do this, they do not require sleeve-end fillet welds. Type B sleeves also encircle the pipeline and provide structural reinforcement, but since the ends are fillet welded to the pipeline, they can also contain pressure in the event that the defect is leaking or will eventually leak in subsequent service. The applicability of Type A sleeves is nearly identical to that for composite repairs and their installation involves no welding to an in-service pipeline. Type B sleeves can be used where composite repairs cannot, such as for repair of defects that are 80%-deep or greater, circumferentially oriented defects, leaking defects, or for defects that will eventually leak (e.g., internal corrosion), and cracks. For both types of full-encirclement steel sleeve, the raw materials are relatively inexpensive and the stiffness and long-term performance is equivalent to that of line pipe steel. The installation of Type B sleeves does involve the need to weld to an in-service pipeline. Adherence to the simple guidance summarized here will avoid the potential concerns associated with welding to an in-service pipeline.
Steel sleeves vs. composites for in-service pipeline repair
Welding Journal, New York ; 90 , 6 ; 72-77
2011
6 Seiten, 10 Bilder, 1 Tabelle, 22 Quellen
Article (Journal)
English
Hot Sleeves - Pipeline-Sanierung ohne Betriebsunterbrechung durch Stahl-Manschette
Tema Archive | 2009
|Emerald Group Publishing | 2002