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Seismic Loads on Large Tanks - API 620
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- Subject: Seismic Loads on Large Tanks - API 620
- From: Paul Meyer <PMeyer(--nospam--at)HASimons.com>
- Date: Wed, 31 Mar 1999 10:51:58 -0800
I am checking the seismic design of a large tank using API 620. In API-620 Appendix L, there is a factor "k" that is used to calculate the period of the first mode of sloshing. "k" is derived as a function of the ratio of diameter to height of the tank. A graph called figure L-4 is given that plots "k" as a function of D/H. The value of "k" is slightly less than 0.6 for all values of D/H less than about 1.8. The tank suppklier has indicated that the value of "k" used in his design is 0.5783933. Either he has much sharper eyes than I do (the graph is about 1 inch high) or he is deriving the value of 'k' numerically. I cannot find an equation for "k", and the value of 0.578...seems about right, but I am curious about the derivation of the value of "k." Any help would be appreciated.
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