EJMA Benchmark Calculations

UNREINFORCED BELLOWS DESIGN CALCULATION SHEET (EJMA NINETH EDITION) Client Name Enquiry No. Size Tag No. Type of Bellows

: : : : :

Quotation No. Quantity Drawing No.

TRIAD BELLOWS 1 24 BENCHMARK SINGLE UNREINFORCED

: : : : :

Date of Calculation Revision No.

123 1 0 15/10/2010 0

PRIME DATA Nominal Bore Dia Thickness of Plies

: :

24.000 NB 0.030 in.

No. of Plies

:

2.000

Pitch of Convolution Collar Length

: :

1.000 in. 1.000 in.

Height of Convolution Spool Length

: :

1.440 in. --- in.

Straight Face

:

0.000 in.

Weld Ends Thickness

:

0.000 in.

Bellows Internal Dia

:

24.000 in.

Bellows Outside Dia

:

27.000

in.

No. of Convolution

:

12.000

Collar Thickness Spool Mass

: :

0.000 ---

in. Lb

Weld Ends Length

:

0.000

in.

DESIGN DATA Design Temperature

:

Axial Movement(Ext)

:

Torsion Rotation

:

Min. Fatigue Cycle

:

Vibration

:

100.000

OF

Design Pressure

0.500 in. --- Deg 1.000 No

:

40.000 PSI

Design Pres.(Extr)

:

Angular Rotation

:

Axial Movement(Comp) :

1.000 in.

Lateral Def in Y plane Safety Factor Fatigue

:

0.060 in.

Lateral Def in Z plane

:

:

1.000

Annealed Bellows

:

No

Weld Factor Vacuum Condition

: :

--5.000 Deg --- in. 1.000 No

MATERIAL SPECIFICATION Bellows :

SA 240 GR 304

Below the Creep Range

:

No

Collar :

Weld Ends :

Spool :

End Fittings :

OUTPUT DATA S1

:

6,301.11 PSI

S'1

:

6,332.57 PSI

S2

:

2,802.25 PSI

S4

:

17,976.05 PSI

S5

:

667.61 PSI

S6

:

105,631.19 PSI

Factor (Cp) :

0.73

Factor (Cd)

1.53

:

S3

494.85 PSI

:

Factor (Ku)

Factor (Cf)

:

:

--1.47

Limiting DP on column Instability(Psc)

:

98.91

PSI

Limiting DP on In plane Instability(Psi)

:

106.05 PSI

Yield Strength Value by EJMA (S*y)

:

342.00

PSI

Yield Strength Value at RT by ASME (Sy)

:

49,602.91 PSI

Modulus of Elasticity at DT (Eb)

:

Thrust Force at Design Pressure

:

Lateral Spring Rate(LSR)

:

Axial Movement per Convolution

: :

Bellows Allowable Stress at DT by ASME(Sab) : Bellows Fatigue Cycle Life(Nc) :

19,870.17 PSI 88,564.29

Axial Spring Rate (Fiu)

:

1,111.80

Angular Spring Rate

:

5.28

Torsion Spring Rate(TS) Axial Vibration

: :

-----

Effective Area(Ae) Single Bellows Length (Lb)

: :

510.71 12.000

Over All Length of Bellows Assembly

:

---

Lb/in Deg Hertz

Thinning Thickness Due to Forming(Tp) Lateral Vibration

in^2 in.

Dual Bellows Length (Lu) Over All Length of Bellows Element

in.

Mean Diameter of Bellows (Dm)

: : : :

27,412,132

PSI

20,428.21 Lbs 6,009.34 0.25 in. 0.03 in. --- Hertz --- in. --- in. 25.50 in.

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