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DATA UNITS

A) CYLINDRICAL SHEL L THICKNESS BASED ON INTERNAL PRESSURE( ts) ( AS PER

DESIGN PRESSURE P 7.15 kg/cm2

INSIDE DIA OF SHELL Di 680 mm INSIDE RADIUS OF S

ALLOW. STRESS OF SHELL MAT. S 1400 kg/cm2

JOINT EFICIENCY E 85 % ts = P X R / ( S X E - 0

CORROSION ALLOWANCE CA 3 mm THICKNESS OF SHE

ts 5.0502484 mm

B) CYLINDRICAL SHELL THICKNESS UNDER EXTERNAL PRESSURE ( ts ) ( AS PER

DESIGN PRESSURE P 7.15 kg/cm2

INSIDE DIA OF SHELL Di 680 mm INSIDE RADIUS OF S

ALLOW. STRESS OF SHELL MAT. S 1400 kg/cm2

JOINT EFICIENCY E 85 %

CORROSION ALLOWANCE CA 3 mm

ASSUMED VALUE OF THICKNESS ts 20 mm

L / Do = 5.138889

EQUIVALENT LENGTH L 3700 mm Do / ts = 36

OUTSIDE DIAMETER Do 720 mm

FACTOR FROM FIG. G A 0.5

FACTOR FROM FIG. G B 200

ALLOWABLE PRESSURE Pa 7.4074074 kg/cm2

C) 2:1 ELLIPSOIDAL HEAD THICKNESS BA SED ON INTERNAL PRESSURE( ts)

DESIGN PRESSURE P 7.15 kg/cm2

INSIDE DIA OF SHELL Di 680 mm INSIDE RADIUS OF S

ALLOW. STRESS OF SHELL MAT. S 1400 kg/cm2

JOINT EFICIENCY E 85 % ts = P X Do / ( 2 X S X

CORROSION ALLOWANCE CA 3 mm THICKNESS OF HEA

ts 3.0204287 mm

D) ELLIPSOIDAL HEAD THICKNESS UNDER EXTERNAL PRESSURE ( th ) ( AS PER

DESIGN EXTERNAL PRESSURE P 1.05 kg/cm2

INPUT DISCRIPTION F

DESIGN OF SHELL AND HEAD

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OUTSIDE DIA OF SHELL Do 720 mm INSIDE DIAMETER O

ALLOW. STRESS OF SHELL MAT. S 1400 kg/cm2

JOINT EFICIENCY E 85 %

CORROSION ALLOWANCE CA 3 mm

ASSUMED VALUE OF THICKNESS th 20 mm

FACTOR :- Ho Ho 180 mm

FACTOR Do / 2 X Ho Do/2Ho 2.11 mm FROM TABLE UG 33.1

OUTSIDE DIAMETER Do 760 mm

FACTOR DEPEND UPON HEAD Ko 0.0405

OUTSIDE RADIUS FOR ELLIPSOIDAL HEAD Ro 30.78

UPPER VALUE

LOWER VALUE

REQUIRED VALUE

FACTOR A A 0.0812216 A = .125 /FACTOR FROM FIG. G B 11 LOOK UP I

FACTOR

1. ALLOWABLE PRESSURE Pa 7.1474984 kg/cm2 FACTOR A FALLING

2. ALLOWABLE PRESSURE Pa 36.942885 kg/cm2 FACTOR A FALLING

MODULUS OF ELASTICITY E 1400 kg/cm2

FINAL THICKNESS REQUIRED IS = th 20 mm

IF VALUE OF Pa IS L

INCREASE VALUE O

th UNTIL Pa IS GREA

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G 27-C )

HELL = 340

.6 X P )

L ts = 2.050248374

UG 32 )

HELL = 340

(AS PER UG 28)

HELL = 340

E - 0.2 X P )

ts = 0.020428694

UG 33 )

ORMULA

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F SHELL(mm 680

Do/2Ho Ko

3.0 1.36

2.8 1.27

2.6 1.18

2.4 1.08

2.2 0.99

2.0 0.90

1.8 0.81

1.6 0.73

1.4 0.65

1.2 0.57

1.0 0.50

2.2 0.99

2 0.9

2.11 0.9495

( Ro/ t ) NTO TABLE AND GET

.

IGHT OF MAT.- TEMP. LINE.

EFT OF MAT.- TEMP. LINE.

SS THAN P ( Pa < P )THEN

th. INCREASING VALUE OF

ER THAN P( Pa > P ).

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1 1.2

2 1.43 1.6

4 1.8

5 2

6 2.2

7 2.4

8 2.6

9 2.8

10 3

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