Bellows Expansion Joint: Pressure Loads, Anchors & Guides

= 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.
R_OD, R_ID =	reaction force for strip beam: lbs.
Rm =	mean rad. of bellows: in.
Ae =	bellows effective thrust area: in²