Vfigueroa
Structural
- Aug 2, 2005
- 6
Hi:
We are in the process of analyzing a proposed fuel line to transport Bunker C and Diesel fuel from a dock to an existing tank facility. Both pipes (20 and 24") runs along the side way of an existing main road and they will have a series of overpass to overcome some creeks at the area. Approximately 80 percent of the pipeline will be located above ground from 3 to 6 feet in height and the other 20% will be buried around 48" below finish grade. This pipeline will be located on a seismic Zone 3 and no active fault has been detected at the area after a preliminary seismic hazard analysis.
For this amount of pipe length, we are wondering if under a seismic event we have to consider a different approach as we normally proceed with a building or any other structure that has to comply with the regulatory design codes. We are still designing under the UBC 97 and the question is as follows:
1) What decides if a special seismic analysis is required for this application:
* Pipeline length,
* Pipeline geometry and/or geography location,
* API or any other Code Regulation,
* Nature and/or location of supports
2) Is it strictly necessary to perform a multiple support excitation analysis?
3) How does any of these analysis could affect the stress analysis that is normally performed to this type of pipeline?
We are in the process of analyzing a proposed fuel line to transport Bunker C and Diesel fuel from a dock to an existing tank facility. Both pipes (20 and 24") runs along the side way of an existing main road and they will have a series of overpass to overcome some creeks at the area. Approximately 80 percent of the pipeline will be located above ground from 3 to 6 feet in height and the other 20% will be buried around 48" below finish grade. This pipeline will be located on a seismic Zone 3 and no active fault has been detected at the area after a preliminary seismic hazard analysis.
For this amount of pipe length, we are wondering if under a seismic event we have to consider a different approach as we normally proceed with a building or any other structure that has to comply with the regulatory design codes. We are still designing under the UBC 97 and the question is as follows:
1) What decides if a special seismic analysis is required for this application:
* Pipeline length,
* Pipeline geometry and/or geography location,
* API or any other Code Regulation,
* Nature and/or location of supports
2) Is it strictly necessary to perform a multiple support excitation analysis?
3) How does any of these analysis could affect the stress analysis that is normally performed to this type of pipeline?
