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RE: API-650

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Brian,
The API 650 has been moving very slowly into the world that was pioneered by new USGS seismic spectral ordinate charts. The spectral ordinate charts were first presented in the 1997 NEHRP and SDO's that used the old seismic "zone" maps were left behind. The 2000 NEHRP presented what we called "bridging equations" so that sloshing could be calculated using the more accurate spectral ordinate charts.

The API 650 Appendix E is in draft form currently, and the intent is to be very similar to what is contained in the IBC 03. I would calculate the sloshing using the 2003 NEHRP. Along with the Commentary, it is easier to understand. The authors of the seismic provisions of the API 650 are the same people that serve on the BSSC and the ASCE 7. The pioneering work on the new sloshing equations was done by Nick Legatos of Preload and is contained in the AWWA D 100 and in ACI 350.3. Nick also served on the BSSC Technical Subcommittee on tanks.

Regards,
Harold Sprague




From: "Brian S Bossley" <BSBossley(--nospam--at)venturaengineering.com>
Reply-To: <seaint(--nospam--at)seaint.org>
To: <seaint(--nospam--at)seaint.org>
Subject: API-650
Date: Wed, 2 Feb 2005 09:37:58 -0500

I'm doing calculations for a tank farm in North Carolina.  To clarify,
I'm not designing the tank, but I am designing the foundations for them.
I looked at our latest version of API 650 (for sloshing effects) and
found that it was the 1997 version which was an UBC-97 based code.  The
latest version of API 650 is 1998 with a 2003 addendum.

My question is: Is anyone familiar with this code? If so, is the new
version an IBC based code?  If not, I'm not exactly sure about how I
would calculate the sloshing effects on my tanks.

Thanks in advance,
Brian S Bossley, PE

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