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  [ TECHNICAL BULLETIN ]

Bellows Expansion Joint: Pressure Loads, Anchors & Guides
 

Tension & Compression System
Bellows "PA" load
Bellows Effective Thrust Area
Main Anchor Design
Intermediate Anchors, Pipe Guides and Pipe Buckling
Tension Systems
 
Appendix
(a) Bellows Thrust Load
(b) Results of Sample Problems

= Appendix - Results of Sample Problems =

 

 

Beam Solution

Approx.

Sample No.

ID

h

Dm

OD

I.D. Load

Sidewall Load

Total Load

Mean D Load

% Difference

1

10"

2"

12"

14"

25p p

11.2p p

36.2p p

36p p

+.5%

2

24

2 1/2

26 1/2

29

144p p

31.9p p

175.9p p

175.6p p

+.17%

3

6

1/2

6 1/2

7

9p p

1.57p p

10.57p p

10.45p p

+.09%

*4

3.44

1.30

4.74

6.04

2.96p p

2.75p p

5.70p p

5.62p p

+1.5%

5

48

2 3/4

50 3/4

53 1/2

576p p

68.2p p

644.2p p

643.9p p

+.05%

Conclusion: The results obtained on the representative sample problems shows the mean diameter approximation is acceptable as an alternate to the beam solution.

*4. This is an extreme case of a typical high corrugation type convoluted bellows, OD/ID=1.76

Nomenclature

p = 

pressure: psig
D =  diameter: in
Dm =  bellows mean dia.: in; Dm = (OD + ID)/2
ID =  bellows inside dia.: in
OD =  bellows outside dia.: in.
h =  corrugation height: in.
ROD, RID reaction force for strip beam: lbs.
Rm =  mean rad. of bellows: in.
Ae =  bellows effective thrust area: in2
   
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