Thickness Calculation Of Pressure Vessel Shell

Shell Under Internal Pr/ / Dt. 17/07/2010 Source Description MOC

THICKNESS OF SHELL

Shell side Design Pressure 39.78 P = 566 PsiInside Radius of shell 625 mm R = 24.61 In

Wall Thickness of Shell 16 mm = 0.63 InWall Thickness of Dish 18 mm td = 0.71 inMax Allowable stress for Shell Material SS 304 L S 20000 PsiMax Allowable stress for Dish Material SS 304 L S 20000 PsiCrown Radius 1250 L = 49.21 InKnuckle Radius 125 r = 4.92 InJoint Efficiency Dish Ed = 1.00Joint Efficiency Shell Es = 1.00

Longitudinal Stress Calculated Thickness of Shell ts = (P*R)/((2*S*E)+(0.4*P)) ts = 0.35 Ints = 8.79 mm

Cicumferential Stress Calculated Thickness of Shell ts = (P*R)/((S*E)-(0.6*P)) ts = 0.71 Ints = 17.99 mm

Add Corrosion Allowance 1.50Thickness of Shell with corrosion allowance 19.49Calculated Thickness is 19.49 mmWe are using 16 mmIncrease Thickness of Shell

THICKNESS OF DISH TORISPHERICA = 1.24 In

Calculated Thickness of Dish = 31.38 mmAdd Thinning Allowances 3.14 mmAdd Corrosion Allowances 1.50 mmNoiminal Thickness of Dish 36.02 mmCalculated Thickness of Dish 36.02 mmWe are using 18 mmIncrease Thickness of Dish

THICKNESS OF DISH ELLIPSOIDAL = 0.70 In

Calculated Thickness of Dish = 17.73 mmAdd Thinning Allowances 1.77 mmAdd Corrosion Allowances 1.50 mmNoiminal Thickness of Dish 21.00 mmCalculated Thickness of Dish 21.00 mmWe are using 18 mmIncrease Thickness of Dish

Shell Under External Pr// Dt. 17/07/2010 Source Description MOC

THICKNESS OF SHELL

Shell External Pressure 4.3 P = 61 PsiOutside Diameter of shell 1282 mm Do = 50.47 InShell Thickness 8 mm ts = 0.31 inDish Thickness 16 mm td = 0.63 inDish SF 40 mm = 1.57 inMax Allowable stress for Shell Material SS 304 L S 15800 PsiMax Allowable stress for Dish Material SS 304 L S 15800 PsiCrown Radius 1282 L = 50.47 InJoint Efficiency Dish Ed = 1.00Dish Depth 336.4 mm h = 13.24 inUnsupported Length of Shell 150 mm L = 5.91 in

L/Do = 0.12Do/t = 160.25

If Do/t >= 10

From Fig G using L/Do and Do/t A = 0.01From Fig HA-3 for 304L B = 8500.00

Pa = 4B/(3*(Do/t)) 4.972322 Pa = 70.72 psi

Hence Safe

THICKNESS OF DISH = 0.29 In

Calculated Thickness of Dish = 7.34 mmAdd Thinning Allowances 0.73 mmAdd Corrosion Allowances 1.00 mmCalculated Thickness of Dish 9.07 mmA = 0.125/(Ro/t) A = 0.00156

From Fig HA-3 for 304L B = 5500

Pa = B/(Ro/t) 4.826077 Pa = 68.64 psi

ASME Sec VIII Div 1 UG-27 ts = (P*R)/((2*S*E)+(0.4*P))

Kgs/cm2

ts

ASME Sec.II Part D Table 1A

ASME Sec VIII Div 1 UG-32td = (0.885* P * L ) / ( ( S * E) - ( 0.1 * P ) ) Td

Td

ASME Sec VIII Div 1 UG-32td = ( P * D ) / ( ( 2* S * E) - ( 0.2 * P ) ) Td

Td

ASME Sec VIII Div 1 UG-28

Kgs/cm2

ASME Sec.II Part D Table 1A

ASME Sec II part D Fig G

ASME Sec VIII Div 1 UG-28

Maximum Allowable external working Pressure Kgs/cm2

ASME Sec VIII Div 1 UG-32

td = (0.885*1.67*P * L ) / ( ( S * E) - ( 0.1 *1.67* P ) ) Td

Td

ASME Sec VIII Div 1 UG-33

ASME Sec II part D Fig G

ASME Sec VIII Div 1 UG-28

Maximum Allowable external working Pressure Kgs/cm2

304L