Process Optimization TABLE 1. Applicable formulas for calculating the permissible nozzle loads Maximum allowable individual loads Nozzles in cylindrical shells w/o reinforcing plate σ F = 6 C21 σ Ml = Mc = M= 1.5 C31 σ 1.15 C31 × C41 Auxiliary values C11 = C21 = C31 = ( Do −T) 2T ( C11)0.5 π × T × Dn 4 C11)0.5 ( π × T × Dn C41 = Maximum allowable individual loads Nozzles in cylindrical shells with reinforcing plate (At transition between vessel and reinforcing plate) σ F = 6 C22 σ Ml = Mc = M = 1.5 C32 σ 1.15 C32 × C42 Auxiliary values C12 = C21 = C32 = ( Do −T) 2T ( C12 )0.5 π × T × Dpad 4 C12 )0.5 ( π × T × Dpad 0.5 ( C42 = ⎛ ⎜⎝ Dpad 2T ⎞ ⎟⎠ 54 MAY 2022 | HydrocarbonProcessing.com ) 2 1.75 C32 Kf = 1 + F = 1.75 C22 σ ⎛ ⎝ Dn 2T ⎞ ⎠ ( )2 0.5 Maximum allowable individual loads Nozzles in spherical shells with reinforcing plate (At transition between vessel and reinforcing plate) σ M = Pr − Pd ) π ( 16 ( C11 = C21 = C31 = 1.75 C31 F = 1.75 C21 σ Ml = Mc = Maximum allowable individual loads Nozzles in spherical shells w/o reinforcing plate σ Maximum allowable individual loads Nozzle in cylindrical shells with reinforcing plate (Adjacent to nozzle neck) σ F = 6 C21 σ M = 1.5 C31 σ 1.15 C31 × C41 Auxiliary values ( Do − T + Tpad 2 T + Tpad ( ( ( C11)0.5 π T + Tpad ( ( π T + Tpad ( C41 = ⎛ ⎝ ⎜ ⎜ Dn 2 T + Tpad ( ( ) π 4 ) ) × Dn 4 C11)0.5 ) Dn ⎞ ⎠ ⎟ ⎟ Maximum allowable individual flange loads F = Pr − Pd G2 G2 × C × Kf Auxiliary value t2 + W−dbh *)2 2.6 t2 2 0.5 ) )) 1.75 C31 Maximum allowable individual loads Nozzle in spherical shells with reinforcing plate (Adjacent to nozzle neck) σ F = 1.75 C21 σhttp://www.HydrocarbonProcessing.com