When is natural gas piping excluded from Seismic restraint in an occupancy category III building? Am I allowed to use either 12" rule or the pipe size exclusion (2" and smaller)?
I have a geotechnical report that gives N (blows per foot) values down to 20 ft. One boring went down to bedrock at 23 feet. All borings record N measurements at 1, 3, 5, 7, 10, 15, and 20 ft. In order to obtain site classification, I need an average N value for the top 100 ft. IBC 2006...
Is a natural gas pipe inside/outside a building allowed to be exempt from seismic bracing if it is less than 2-1/2" in interior diameter and/or mounted less than 12" from top of pipe to supporting structure?
