Shell Under Internal Pr/ / Dt.

17/07/2010
Source Description MOC

THICKNESS OF SHELL
ASME Sec VIII Div 1 UG-27 ts = (P*R)/((2*S*E)+(0.4*P))
Shell side Design Pressure 39.78 Kgs/cm2 P = 566 Psi
Inside Radius of shell 625 mm R = 24.61 In
Wall Thickness of Shell 16 mm ts = 0.63 In
Wall Thickness of Dish 18 mm td = 0.71 in
ASME Sec.II Part D Max Allowable stress for Shell Material SS 304 L S 20000 Psi
Table 1A Max Allowable stress for Dish Material SS 304 L S 20000 Psi
Crown Radius 1250 L = 49.21 In
Knuckle Radius 125 r = 4.92 In
Joint Efficiency Dish Ed = 1.00
Joint Efficiency Shell Es = 1.00
Longitudinal Stress Calculated Thickness of Shell ts = (P*R)/((2*S*E)+(0.4*P)) ts = 0.35 In
ts = 8.79 mm
Cicumferential Stress Calculated Thickness of Shell ts = (P*R)/((S*E)-(0.6*P)) ts = 0.71 In
ts = 17.99 mm
Add Corrosion Allowance 1.50
Thickness of Shell with corrosion allowance 19.49
Calculated Thickness is 19.49 mm
We are using 16 mm
Increase Thickness of Shell
THICKNESS OF DISH TORISPHERICA td = (0.885* P * L ) / ( ( S * E) - ( 0.1 * P ) ) Td = 1.24 In
ASME Sec VIII Div 1 UG-32
Calculated Thickness of Dish Td = 31.38 mm
Add Thinning Allowances 3.14 mm
Add Corrosion Allowances 1.50 mm
Noiminal Thickness of Dish 36.02 mm
Calculated Thickness of Dish 36.02 mm
We are using 18 mm
Increase Thickness of Dish
THICKNESS OF DISH ELLIPSOIDAL td = ( P * D ) / ( ( 2* S * E) - ( 0.2 * P ) ) Td = 0.70 In
ASME Sec VIII Div 1 UG-32
Calculated Thickness of Dish Td = 17.73 mm
Add Thinning Allowances 1.77 mm
Add Corrosion Allowances 1.50 mm
Noiminal Thickness of Dish 21.00 mm
Calculated Thickness of Dish 21.00 mm
We are using 18 mm
Increase Thickness of Dish

Shell Under External Pr// Dt. 17/07/2010

Source Description MOC
ASME Sec VIII Div 1
UG-28 THICKNESS OF SHELL
Shell External Pressure 4.3 Kgs/cm2 P = 61 Psi
Outside Diameter of shell 1282 mm Do = 50.47 In
Shell Thickness 8 mm ts = 0.31 in
Dish Thickness 16 mm td = 0.63 in
Dish SF 40 mm = 1.57 in
ASME Sec.II Part D Max Allowable stress for Shell Material SS 304 L S 15800 Psi
Table 1A Max Allowable stress for Dish Material SS 304 L S 15800 Psi
Crown Radius 1282 L = 50.47 In
Joint Efficiency Dish Ed = 1.00
Dish Depth 336.4 mm h = 13.24 in
Unsupported Length of Shell 150 mm L = 5.91 in
L/Do = 0.12
Do/t = 160.25
If Do/t >= 10
ASME Sec II part D
Fig G From Fig G using L/Do and Do/t A = 0.01
From Fig HA-3 for 304L B = 8500.00
ASME Sec VIII Div 1 Maximum Allowable external working
UG-28 Pressure Pa = 4B/(3*(Do/t)) 4.972322 Kgs/cm2 Pa = 70.72 psi

Hence Safe
ASME Sec VIII Div 1 THICKNESS OF DISH td = (0.885*1.67*P * L ) / ( ( S * E) - ( 0.1 *1.67* P ) ) Td = 0.29 In
UG-32 Calculated Thickness of Dish Td = 7.34 mm
Add Thinning Allowances 0.73 mm
Add Corrosion Allowances 1.00 mm
Calculated Thickness of Dish 9.07 mm
ASME Sec VIII Div 1 A = 0.125/(Ro/t) A = 0.00156
UG-33
ASME Sec II part D
Fig G From Fig HA-3 for 304L B = 5500
ASME Sec VIII Div 1 Maximum Allowable external working
UG-28 Pressure Pa = B/(Ro/t) 4.826077 Kgs/cm2 Pa = 68.64 psi
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