We have been using the guidlines in the API 650 Code for designing our windgirders. However we want to use a shape and size a little different than what is in the code book. Before we do that we want to be sure we are using the correct method for calculating the section modulous. Currently we keep coming up with numbers real close to the figures listed in the code book, but not exactly. Can someone tell me why this might be. Are we perhaps using the wrong dimensions for angle and plate? (I don't see how) or could we be using the wrong method? Right now I am first finding the Moment of inertia about the y-axis then dividing it by the distance from the netural axis to the edge. S= I/c. Please advise, and thanks in advance.
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