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You may think that your D/2h ratio should result in a K factor of 1.0, but have you considered your internal corrosion allowance. K is defined as “a factor in the equations for ellipsoidal heads depending on the head proportion D/2h”. If you look at Appendix 1-4(c) you can see the equation used to determine K (shown below). When solving for K you will need to make sure your D and h are in the corroded condition to satisfy UG-16(e).
Example 1: Supposed to 2:1 Ellipsoidal Head
ID = 16 in
h = 4 in
Inside CA = 0.0625 in
Example 2: Actual 2:1 Ellipsoidal Head
ID = 16 in
h = 4 in
Inside CA = 0 in
