I have been assigned to design an open top process tank in general accordance with API 650. The tank diameter is 10200mm and the overall height is 10700mm. The material is carbon steel and the shell plate thickness is 6mm. Top curb angle is 80x80x6 angle. My concern regards the possibility of the shell plate buckling due to the vertical loading imposed by a horizontal structural comprising of two beams supporting a walkway and central vertical vertical agitator. The two main horizontal support beams are 720x250mm I section and are situated 1850mm apart. Therefore the load at each support point is 2500 kg. Other than carrying out an FEA, I have absolutely no idea how to resolve this problem Your advise and recommendations would therefore be most welcome.