Rafters and Columns Required.
Rafters and Columns Required.
(OP)
In the designing of Water Storage tank, is there a rule or method of determining if its necessary, to use columns and rafters?. I have a Tank with 16 feet x 23 feet and a conical "self supported" roof of 3/16" thick, and a Tan 20º of slope.
Thanks.
Thanks.






RE: Rafters and Columns Required.
This equation is in API-650 but is commonly applied to AWWA tanks as well. It can generally be shown that roofs meeting this requirement will comply with the compressive stress formulas of AWWA as well.