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codeeng, As previously stated, there are many major tank builders that can do this type of work. I would stick with large companies CBI, Matrix, ATV, PTC, and the like. If you are thinking that 70-80% additional is a good guide, I would disagree. There are a number of special difficulties...

farzam, We do a lot of tank jacking for foundation repair and many of the tanks have floating roofs. In every case, we jack and support the floating roof from the shell and cribbing off the bottom well away from the corner weld. We will also support off columns if they are available. I am...

In ASCE 7-05, Table 6-3 gives the value for Kh and Kz based on the height above ground z. Table 6-2, the facing page, defines z as 0.6H or zmin, see the note.

JStephen, In your reply, you indicated that the uplift was to be multiplied by the cross-sectional area. In API, they indicate that it is to be multiplied by the "horizontal projected area". I have searched and searched and can not find how to calculate "horizontal projected area". The...

It actually works the opposite of how I read your question. API 650 requires that reinforcing pads and inserts for shell nozzles and manholes be of the same material as the shell plate to which they are attached. Please see API 650 2.2.9.3.

Can anyone point me to a resource that provides a definition of the horizontal projected area of a cone? Thanks, Earle

I've been out of API for some time and things have changed. I need some help. Used to be you looked at overturning like this; Pressure * Area (height * Diameter) * (height /2) (for shell) plus (Pressure * Area ((diameter * height of roof) /2) * (Centroid of roof + height of tank) We then...