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That diameter is ok if you add gussets all the way along the length of the pipe, say 4 of them so that the diameter is extended to around 8 or 9". The wider this is the better really. For something around 1200 high you might want to consider an overall diameter of 10" including gussetts. Using gussets will also aid the stability of the flange welds too.
With a design like this you can later use a larger mount and scope on that pier too, if you so desire.
A short search here will give you several threads where calculations have been produced. It may prove informative for your needs.
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