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Field Erected Tanks <br /> Storage Tanks Calculation D= <br /> Shells Calculation is 2.6*D*(H-1)*G/(S*E) H= <br /> D- is tank diameter in feet. G= <br /> H- is Height in feet from reading to max liquid level. S= <br /> G - is highest specific gravity of tank contents. E_ <br /> E- is joint efficiency, (.7 assum). Max Level <br /> See Below S- is material max allowable stress. Rdng. Ht. <br /> Max Level-enter in max. liquid level in feet. Tflag= #DIV/0! <br /> Rdng. Ht. -enter in reading point in inches. <br /> As Per API 653 Maximum Allowable Stress Use These Formulas. 1st&2nd .80*Y= 0 <br /> S= Maximum allowable stress in pounds per square inch. Y= <br /> Use the smaller of 0.80*Y or 0.429*T for bottom and Remember To Use The Smallest! <br /> second courses. Use the smaller of 0.88*Y or 0.472*T .429*T= 0 <br /> for all other courses. For reconstructed tanks, S shall T= <br /> be in accordance with the current applicable standard. <br /> All Other .88*Y= 0 <br /> Y= Specified minimum yield strength of the plate; use Y= <br /> 30,000 pounds per square inch if not known. Remember To Use The Smallest! <br /> T= The smaller of the specified minimum tensile strength .472*T= 0 <br /> of the plate or 80,000 pounds per square inch; use T= <br /> 55,000 pounds per square inch if not known. <br />