Gas Technology Institute
Click the image to zoom

Effects of Pressure Cycles on Gas Pipelines

SKU: GRI-04/0178
Effects of Pressure Cycles on Gas Pipelines

The objective of this study was to establish whether or not gas pipelines have a significant degree of exposure to failure from seam defects that could become enlarged by pressure-cycle-induced fatigue. Pressure-cycle histories of three typical gas pipelines were compared to the pressure-cycle history of a liquid pipeline known to have aggressive pressure cycles.
Document Type
Report
Report Type
Topical Report
Corporate Source
Process Performance Improvement Consultants, LLC; Kiefner and Associates, Inc., Worthington, OH
Sponsor
Gas Research Institute, Des Plaines, IL
Pagination
27p
Product Media
PDF Download
$295.00 / Each
 
Availability: In Stock
Summary:
The objective of this study was to establish whether or not gas pipelines have a significant degree of exposure to failure from seam defects that could become enlarged by pressure-cycle-induced fatigue. Pressure-cycle histories of three typical gas pipelines were compared to the pressure-cycle history of a liquid pipeline known to have aggressive pressure cycles. Times to failure were computed for worst-case hypothetical seam defects that would have barely survived a hydrostatic test to 100 percent of the specified minimum yield strength (SMYS) and were subsequently subjected to the pressure-cycle histories of typical gas pipelines. The predicted times to failure ranged from 170 years to more than 400 years, indicating that, in most circumstances, gas pipelines are not at significant risk of failure from the pressure-cycle-induced growth of seam defects that may exist after a hydrostatic test. The times to failure for this mode of crack growth are much longer than the expected useful life of a typical gas pipeline. Therefore, there is no need, in general, to conduct periodic integrity assessments of gas pipelines from the standpoint of pressure-cycle-induced fatigue in seams. A one-time hydrostatic test to a reasonably high level would be sufficient to assure that a natural gas pipeline would not be susceptible to the effects of pressure cycle fatigue on flaws in longitudinal seams.
Tell a friend about this product
Include a Note:
Allowed Credit Cards
Powered by Fortune3