Thickness Calculation Of Pressure Vessel Shell

Source ASME Sec VIII Div 1 UG-27

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

MOC

Longitudinal Stress

ts = (P*R)/((2*S*E)+(0.4*P)) THICKNESS OF SHELL Shell side Design Pressure Inside Radius of shell Wall Thickness of Shell Wall Thickness of Dish Max Allowable stress for Shell Material SS 304 L Max Allowable stress for Dish Material SS 304 L Crown Radius Knuckle Radius Joint Efficiency Dish Joint Efficiency Shell Calculated Thickness of Shell ts = (P*R)/((2*S*E)+(0.4*P))

Cicumferential Stress

Calculated Thickness of Shell

ASME Sec.II Part D Table 1A

ASME Sec VIII Div 1 UG-32

ASME Sec VIII Div 1 UG-32

39.78 625 16 18

Kgs/cm2 mm mm mm

1250 125

ts = (P*R)/((S*E)-(0.6*P))

Add Corrosion Allowance Thickness of Shell with corrosion allowance Calculated Thickness is 19.49 mm We are using 16 mm Increase Thickness of Shell td = (0.885* P * L ) / ( ( S * E) - ( 0.1 * P ) ) THICKNESS OF DISH TORISPHERICAL

P R ts td S S L r Ed Es ts ts ts ts

= = = =

= = = = = = = =

566 24.61 0.63 0.71 20000 20000 49.21 4.92 1.00 1.00 0.35 8.79 0.71 17.99 1.50 19.49

Psi In In in Psi Psi In In

In mm In mm

Td

=

1.24

In

Calculated Thickness of Dish Add Thinning Allowances Add Corrosion Allowances Noiminal Thickness of Dish 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

=

31.38 3.14 1.50 36.02

mm mm mm mm

Td

=

0.70

In

Calculated Thickness of Dish Add Thinning Allowances Add Corrosion Allowances Noiminal Thickness of Dish Calculated Thickness of Dish We are using Increase Thickness of Dish

Td

=

17.73 1.77 1.50 21.00

mm mm mm mm

P Do ts td

= = = = =

61 50.47 0.31 0.63 1.57 15800 15800 50.47 1.00 13.24 5.91 0.12 160.25

Psi In in in in Psi Psi In

21.00 18

Shell Under External Pr// Dt. 17/07/2010 Source Description ASME Sec VIII Div 1 UG-28 THICKNESS OF SHELL Shell External Pressure Outside Diameter of shell Shell Thickness Dish Thickness Dish SF ASME Sec.II Part D Max Allowable stress for Shell Material Table 1A Max Allowable stress for Dish Material Crown Radius Joint Efficiency Dish Dish Depth Unsupported Length of Shell

mm mm

MOC

4.3 1282 8 16 40

Kgs/cm2 mm mm mm mm

SS 304 L SS 304 L 1282 336.4 150

mm mm

S S L Ed h L L/Do Do/t

= = = = = =

in in

If Do/t >= 10 ASME Sec II part D Fig G

From Fig G using L/Do and Do/t From Fig HA-3 for 304L ASME Sec VIII Div 1 Maximum Allowable external working UG-28 Pressure

Hence Safe ASME Sec VIII Div 1 THICKNESS OF DISH UG-32 Calculated Thickness of Dish Add Thinning Allowances Add Corrosion Allowances Calculated Thickness of Dish ASME Sec VIII Div 1 A = 0.125/(Ro/t) UG-33 ASME Sec II part D Fig G From Fig HA-3 for 304L ASME Sec VIII Div 1 Maximum Allowable external working UG-28 Pressure

A B

= 0.01 = 8500.00

Pa

=

70.72

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

=

0.29

Td

=

7.34 0.73 1.00 9.07 = 0.00156

B

= 5500

Pa

=

Pa = 4B/(3*(Do/t))

2 4.97232 Kgs/cm

A

Pa = B/(Ro/t)

2 4.82608 Kgs/cm

68.64

psi

In mm mm mm mm

psi

304L