Current Issue Highlights
Direct Stress Monitoring of Pipelines and Development of Limitations - A Case Study
A segment of high-pressure steel petroleum pipeline needed to be replaced on a hillside and beneath a waterway within an existing right-of-way containing multiple petroleum pipelines. The pipeline replacement required excavation of sedimentary rock to allow placement of the new pipe. As a result of an existing right-of-way limitation, steep slopes, and hard rock, blasting would be required as close as 7.8 meters (25 feet) from two operating pipelines.
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Determination of Blast Vibration Limits by Direct Strain Measurement
Structural blast vibration limits should be based on the strength of the structure, the stress induced by blasting, and a responsible factor of safety. In this article a methodology that uses direct strain measurements to determine the stress induced by blasting is described.