Putting the steel back into pipelines.
There are millions of miles of oil and gas pipelines worldwide. Thousands of miles of these are suffering from environmental corrosion leading to pipe wall loss and integrity concerns from dents, stress corrosion cracking (SCC) and cathodic protection (CP) deficits or excesses.
Operators are required to reduce operating pressure until these anomalies are resolved. Low pressures cost money and the anomalies can cause an even greater risk, often resulting in complete shutdown of a pipeline for repair.
What if you could rehabilitate long lengths of your pipelines, while in service, and not continuously have to repair or patch small sections?
XHab is a new technology for external rehabilitation of pipelines. It can be used to refurbish long lengths of aging, dented or corroded pipelines while they remain in operation.
Helical Steel Strip
The process involves helically wrapping multiple layers of an ultra-high strength steel strip over an existing pipeline, using an integrated forming and wrapping machine. This repair is in-ditch while the pipeline remains in operation. This can also be done by hand for small on-site repairs, as and when needed. The XHab process provides:
(1) A rehabilitation system that adds steel back to the pipeline wall in a continuous operation, reinforcing an unlimited length of pipeline.
(2) The reinforcement afforded by the strip can be used to (a) increase the operating pressure of a defective pipeline back to, or greater than, its original MAOP or (b) it can be used to modify the hoop stress related to class location.
During testing, six pipes of 10-inch OD had a rectangular defect machined into the outer wall to represent an 80% reduction in wall thickness. The defect was then filled with an epoxy filler and rounded to the pipe profile. Four layers of UHSS strip were applied over the defective area.
The test results showed that the repair was stronger than the original pipe, with burst pressures well in excess of 3,000 psig (207 bar)--the bursts occurred in the unwrapped section of pipe. The XHab technology enables significant opex and capex value savings, including:
(1) The convenience of a repair with the risk reduction of replacement.
(2) Repairs made on-site with reduced man power and no pipeline down-time enable significant cost savings for the operator.
(3) It is a compelling benefit to keep the line in service for up-rating and or class change reinforcement while reducing the hoop stress in the host pipe. This is achieved at a fraction of the cost of pipe replacement.
(4) A range of different pipeline anomalies and problems can be permanently repaired as a single, robust technical solution, applied in a single operation.
(5) XHab is not only less costly than pipe replacement, but, when applied in small lengths by hand, can be a significantly less expensive option than the alternative composite or sleeve repair.
XHab[TM] is an innovative, cost effective, solution to pipeline rehabilitation. Contact Joe Hall, Director, Business Development, Pipestream, Inc., 6955 High Life Drive, Houston, TX 77066, 281-580-7473, email: email@example.com.
Special To Pipeline & Gas Journal
Burst pressure of six test pipes in ksig Defective pipe, Defective pipe with Defective pipe with unrestrained burst Xhab[TM], unrestrained Xhab[TM], restrained burst burst A 0.94 B 1.006 C 3.146 F 3.164 D 3.249 E 3.407 Note: Table made from bar graph.
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|Title Annotation:||Tech Notes: Product Development|
|Comment:||Putting the steel back into pipelines.(Tech Notes: Product Development)|
|Publication:||Pipeline & Gas Journal|
|Date:||Jul 1, 2010|
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