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
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 |
<“ |
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 |
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 alternative 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.