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RE: I factor & API 650 Appendix E[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaint(--nospam--at)seaint.org
- Subject: RE: I factor & API 650 Appendix E
- From: "Lutz, James" <James.Lutz(--nospam--at)earthtech.com>
- Date: Mon, 20 Jan 2003 15:56:42 -0800
The I factor for API 650 (10th edition with amendment 1 dated March 2000) appears to use the same seismic importance factors as the 1997 UBC, 1.0 for "standard' and 1.25 for "hazardous" classification. This distinction is that API 650 suggests using 1.0 unless the release of the contents would "be considered dangerous to the general public" and the 1997 UBC would require a hazardous classification merely based on the quantity of the flammable liquids stored, irrespective of location.
If the UBC applies to your location, I think you would have to use a 1.25 importance factor. Even though UBC 1634.4 allows the use of nationally recognized standards for the seismic design of tanks (e.g. AWWA, API), you are still bound by the occupancy categories of UBC 1629.2.
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