Read CGA 6.1 - it covers this.
A bow in a tank not designed to have a bow falls under the 'dent' classification. IE, a deformation where wall thickness is not changed.
Quote:
CGA C6.1-1995
4.3 Dents. In general, dents which do not reduce the wall thickness can be tolerated. However, current practice is to accept dents up to 1/16th inch (0.062 inch; 1.575 mm) in depth when the major diameter of the dent is 2 inches (50.8 mm) or greater. See Figure 1.
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