UNREINFORCE BELLOWS DESIGN CALCULATION SHEET (EJMA NINTH

UNREINFORCE BELLOWS DESIGN CALCULATION SHEET (EJMA NINTH EDITION) Client Name

: XYZ

Quotation No

:

5321

Users Name

: Deepak G

Drawing No

:

32134

Revision No

: 43

Calculated By

:

Deepak G

Tag No

: 11

Date of Calculation

:

10/08/2011

Type of Bellows

: DUAL UNREINFORCED

DESIGN DATA :

Design Pres.

: 100.000 PSI

Weld Factor

250.000

OC

Design Temp.

:

1.000

Min. Fatigue Cycle

:

1,000.000

Fatigue Safety Factor

:

1.000

Design Pres. (Extr)

:

--- PSI

Vibration

:

Axial Movement (Ext)

:

12.700 mm

Axial Movement (Comp)

:

--- Deg --- mm

Angular Rotation

:

Lateral Def in Z plane

:

Annealed Bellows

:

No of Convolution

:

No

No 25.400 mm

Torsion Rotation

:

--- Deg

Lateral Def in Y plane

:

50.800 mm

Vacuum Condition

:

No

Collar Thickness

PRIME DATA Nominal Bore Dia.

:

:

6.350 mm

Bellows Internal Dia.

:

609.000 mm Pitch of Convolution

0.000 NB

:

25.400 mm Collar Length

:

31.750 mm

Bellows Outside Dia.

:

685.200 mm Height of Convolution

:

36.580 mm Spool Length

:

710.800 mm

Plies Thickness

:

0.760 mm Straight Face

:

25.400 mm

:

--- Kg

No. of Plies

:

2.000

:

--- mm

:

--- mm

Weld Ends Thickness

4.000

Spool Mass Weld Ends Length

MATERIAL SPECIFICATION Bellows

: SA 240 GR 304

Collar

:

Below the Creep Range

:

Spool

:

No

SA 240 GR 304

Weld Ends

:

End Fittings

:

CALCULATED VALUE Factor (Cp)

:

0.734

S1

:

4,562.652 PSI

S4

:

45,169 PSI

Factor (Cd)

:

1.533

S'1

:

4,681.042 PSI

S5

:

1,128 PSI

Factor (Cf)

:

1.470

S2

:

7,449.271 PSI

S6

:

178,924 PSI

Bellows Fatigue Cycle Life (Nc)

:

S3

:

1,240 PSI

Thrust Force at Design Pressure

:

Axial Spring Rate per Convolution (Fiu)

:

18.782 Kg/mm

Lateral Spring Rate (LSR)

:

6.243 Kg/mm

Angular Spring Rate

:

Axial Movement per Convolution

:

--- Kgm/Deg 10.559 mm

Torsion Spring Rate (TS)

:

Rocking Vibration (Fn)

:

Mean Diameter of Bellows (Dm) Axial Vibration (Fn)

: :

647.100 mm --- Hertz

Effective Area (Ae) Lateral Vibration (Fn)

:

328,876 mm^2 --- Hertz

Single Bellows Length (Lb)

:

101.600 mm

Dual Bellows Length (Lu)

:

914.000 mm

Over All Length of Bellows Assembly

:

964.800 mm

Over All Length of Bellows Element

:

152.400 mm

4,323.904 50,975.941 Lbs

--- Kgm/Deg --- Hertz

Factor Ku :

1.119

Limiting DP on column Instability (Psc)

:

208.994 PSI

Limiting DP on In plane Instability (Psi)

:

83.455 PSI

Yield Strength Value by EJMA (S*y)

:

19,580.095 PSI

Yield Strength Value at RT by ASME (Sy)

:

30,022.812 PSI

Bellows Allowable Stress at DT by ASME (Sab):

17,694.604 PSI

Modulus of Elasticity at DT (Eb)

25,961,755.05 : PSI

Thinning Thickness Due to Forming (Tp)

: :

0.737 mm

CONCLUSION : Above all the values and stresses are safe and acceptable as per EJMA NINTH Edition with respect to temperature, pressure and movement.